Pub Date : 2020-11-02DOI: 10.36487/acg_repo/2052_90
J. Palmer
Tailings filtration is growing in interest with increased pressure on water resources and Tailings storage facility legislation. In greenfield projects limited sample is available to evaluate filtration performance and often composite samples to represent mineral recovery are utilised. The mineral resource over the life of the mine can be variable and small changes in clay or other material can have significant effects on the filterability. This paper looks at methods to predict filterability of a tailings stream with changes in mineralogy. Based on initial testwork and historical database information, mineralogy and particle size data can be analysed in HSC SIM to predict the rate and achievable moisture. Together with plant model information, alternative dewatering strategies can be evaluated to determine the capital and operating costs.
{"title":"Simulation of tailings filtration performance","authors":"J. Palmer","doi":"10.36487/acg_repo/2052_90","DOIUrl":"https://doi.org/10.36487/acg_repo/2052_90","url":null,"abstract":"Tailings filtration is growing in interest with increased pressure on water resources and Tailings storage facility legislation. In greenfield projects limited sample is available to evaluate filtration performance and often composite samples to represent mineral recovery are utilised. \u0000The mineral resource over the life of the mine can be variable and small changes in clay or other material can have significant effects on the filterability. \u0000This paper looks at methods to predict filterability of a tailings stream with changes in mineralogy. Based on initial testwork and historical database information, mineralogy and particle size data can be analysed in HSC SIM to predict the rate and achievable moisture. Together with plant model information, alternative dewatering strategies can be evaluated to determine the capital and operating costs.","PeriodicalId":164781,"journal":{"name":"23rd International Conference on Paste, Thickened and Filtered Tailings - PASTE 2020","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116279738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-02DOI: 10.36487/acg_repo/2052_86
Maycon Alves, A. Marques
The filtering of sandy tailings from the reverse cationic flotation processes and the subsequent stacking of these tailings has shown to be a very strong trend in Brazilian iron ore mining, especially after accidents involving geotechnical structures known as tailings dams, but also due to concern of mining companies to develop a disposal technique that is more complacent with the environment and the surrounding society. In order to develop the sandy tailings filtration project, a fundamental requirement was the correct choice of filtration technology among the many existing ones. For the material object of this study, the filter with vertical discs presented itself as the most productive due to factors such as granulometry, specific surface of the material and the humidity required in the filtration product. Several exploratory and material characterization tests were carried out for this purpose. Disc filters have the principle of operation linked to the difference in atmospheric pressure and the vacuum pressure induced by pumps. The vacuum must act on the filtering screens next to the filter heads and, in order not to drop the yield, the system must be sealed hydraulically. As previously mentioned, there are basically two ways to hydraulic seal the system. The first and most common in Brazilian iron ore filtration is carried out through barometric columns and the other is using filtrate pumps installed directly in the vacuum receiver of the filtration facilities. The decision of which method to use has major implications for the design of the filtering installation and the comparison between the two conditions mentioned is the objective of the present work.
{"title":"Barometric Column Filtration vs. Filtrate Pump Filtration Comparison - Case Study","authors":"Maycon Alves, A. Marques","doi":"10.36487/acg_repo/2052_86","DOIUrl":"https://doi.org/10.36487/acg_repo/2052_86","url":null,"abstract":"The filtering of sandy tailings from the reverse cationic flotation processes and the subsequent stacking of these tailings has shown to be a very strong trend in Brazilian iron ore mining, especially after accidents involving geotechnical structures known as tailings dams, but also due to concern of mining companies to develop a disposal technique that is more complacent with the environment and the surrounding society. \u0000In order to develop the sandy tailings filtration project, a fundamental requirement was the correct choice of filtration technology among the many existing ones. For the material object of this study, the filter with vertical discs presented itself as the most productive due to factors such as granulometry, specific surface of the material and the humidity required in the filtration product. Several exploratory and material characterization tests were carried out for this purpose. \u0000Disc filters have the principle of operation linked to the difference in atmospheric pressure and the vacuum pressure induced by pumps. The vacuum must act on the filtering screens next to the filter heads and, in order not to drop the yield, the system must be sealed hydraulically. \u0000As previously mentioned, there are basically two ways to hydraulic seal the system. The first and most common in Brazilian iron ore filtration is carried out through barometric columns and the other is using filtrate pumps installed directly in the vacuum receiver of the filtration facilities. The decision of which method to use has major implications for the design of the filtering installation and the comparison between the two conditions mentioned is the objective of the present work.","PeriodicalId":164781,"journal":{"name":"23rd International Conference on Paste, Thickened and Filtered Tailings - PASTE 2020","volume":"239 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116326373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-02DOI: 10.36487/acg_repo/2052_93
S. Javadi, B. Pirouz, P. Slatter
Tailings transport is an integrated element in any wet tailings storage facility (TSF). Tailings from the process plant are often thickened to a moderate or relatively high (but still pumpable) solids concentration, depending on several parameters mainly the TSF deposition requirements and strategies, process plant water security status and the dewatering technology utilised. This paper overviews the transportation of paste and thickened tailings and discusses various aspects and considerations in the hydraulic design of the system. Material characteristics, flow behaviour assessment (rheological behaviour measurement and interpretation) and the basis of design definition are discussed. The recent developments in environmental authorities’ regulations associated with the tailings pipeline burst and leakage management are also reviewed in this paper. The tailings leakage and spillage to the environment is one the main concerns for any tailings hydraulic transportation system, therefore as part of the tailings pipeline design, the pipeline integrity failure (due to pipe wear, overpressure bursting etc.) should be thoroughly analysed to propose proper mitigation measures. The paper discusses a methodology to assess the potential tailings volume release to the environment in an event of the pipeline integrity failure which would be of interest to the operators and designers.
{"title":"Paste and Thickened Tailings Transportation Design Aspects Overview","authors":"S. Javadi, B. Pirouz, P. Slatter","doi":"10.36487/acg_repo/2052_93","DOIUrl":"https://doi.org/10.36487/acg_repo/2052_93","url":null,"abstract":"Tailings transport is an integrated element in any wet tailings storage facility (TSF). Tailings from the process plant are often thickened to a moderate or relatively high (but still pumpable) solids concentration, depending on several parameters mainly the TSF deposition requirements and strategies, process plant water security status and the dewatering technology utilised. \u0000This paper overviews the transportation of paste and thickened tailings and discusses various aspects and considerations in the hydraulic design of the system. Material characteristics, flow behaviour assessment (rheological behaviour measurement and interpretation) and the basis of design definition are discussed. \u0000The recent developments in environmental authorities’ regulations associated with the tailings pipeline burst and leakage management are also reviewed in this paper. The tailings leakage and spillage to the environment is one the main concerns for any tailings hydraulic transportation system, therefore as part of the tailings pipeline design, the pipeline integrity failure (due to pipe wear, overpressure bursting etc.) should be thoroughly analysed to propose proper mitigation measures. The paper discusses a methodology to assess the potential tailings volume release to the environment in an event of the pipeline integrity failure which would be of interest to the operators and designers.","PeriodicalId":164781,"journal":{"name":"23rd International Conference on Paste, Thickened and Filtered Tailings - PASTE 2020","volume":"16 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116583724","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-02DOI: 10.36487/acg_repo/2052_15
W. Montes-Quiroz, P. Garrido, C. Moscoso
It has been determined, after a technical feasibility study, that ultrasonic is the best alternative to characterize slurry flows in tailings flumes, by using the “Ultrasonic Velocity Profile” (UVP) technique, which among its many advantages it has shown not to be invasive, to have a high sample frequency, to have the ability to make measurements in opaque means, to have portability, and also that its implementation in existing structures is not complex, nor that it requires special permissions like other technologies do (based on radiation). In the Investigation Centre JRI (CI-JRI), two measurement UVP’s prototypes have been designed, built and set up in transport systems of flumes on a laboratory scale. These prototypes have also been able to perform ultrasonic measurements that have got to a correct estimation of the velocity profile, together with an ad hoc post-processing methodology, outcomes that allow projecting applications at an industrial level and that would generate meaningful benefits in the operation. The future challenges aim to higher scale tests and the development of a given post-processing methodology that would let determine inline, and with a precision over 1%, associated values to the concentration of solids in the fluid, the velocity profile of the fluid in the flume and rheological parameters, all essential to a correct controlling of stages in the transportation of tailing slurries with high concentration.
{"title":"Inline Characterization of mining slurries by Ultrasonic velocity profile technique (UVP)","authors":"W. Montes-Quiroz, P. Garrido, C. Moscoso","doi":"10.36487/acg_repo/2052_15","DOIUrl":"https://doi.org/10.36487/acg_repo/2052_15","url":null,"abstract":"It has been determined, after a technical feasibility study, that ultrasonic is the best alternative to characterize slurry flows in tailings flumes, by using the “Ultrasonic Velocity Profile” (UVP) technique, which among its many advantages it has shown not to be invasive, to have a high sample frequency, to have the ability to make measurements in opaque means, to have portability, and also that its implementation in existing structures is not complex, nor that it requires special permissions like other technologies do (based on radiation). \u0000In the Investigation Centre JRI (CI-JRI), two measurement UVP’s prototypes have been designed, built and set up in transport systems of flumes on a laboratory scale. These prototypes have also been able to perform ultrasonic measurements that have got to a correct estimation of the velocity profile, together with an ad hoc post-processing methodology, outcomes that allow projecting applications at an industrial level and that would generate meaningful benefits in the operation. \u0000The future challenges aim to higher scale tests and the development of a given post-processing methodology that would let determine inline, and with a precision over 1%, associated values to the concentration of solids in the fluid, the velocity profile of the fluid in the flume and rheological parameters, all essential to a correct controlling of stages in the transportation of tailing slurries with high concentration.","PeriodicalId":164781,"journal":{"name":"23rd International Conference on Paste, Thickened and Filtered Tailings - PASTE 2020","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129070426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-02DOI: 10.36487/acg_repo/2052_105
M. Sánchez, Victorio Araya, G. Suazo
Chile produces large amounts of tailings daily which must be safely disposed on the earth’s surface. There are a series of strategies that have been successfully used in our country to store tailings, among them are thickened and paste tailings. Paste tailings are an advantageous technique that allows for greater recovery of water while improving physical stability of the structure. Although challenges are faced worldwide when large production rates are tried to be thickened, the technique seems promising for countries like Chile where there is an ongoing water crisis. The stability of paste tailings facilities is highly influenced by water content or saturation. As consolidation occurs the tailings loses water. However, as the evaporation front takes place, the material goes from a saturated to a non-saturated state. Unsaturated paste has shown improved resistance, e.g. liquefaction resistance almost double when saturation drops below 90%. A well planned facility operation should consider the monitoring of the water content of the paste. However, this is sometimes difficult, due to the large areas that must be controlled and the danger associated with manual moisture measurements in the field. In this context, we proposed the use of hyperspectral cameras to obtain a relationship between the paste moisture content and light reflectance. This would allow to generate moisture surface map and to the use of this data to monitor for instance evaporation rates or water balance in tailings storage facilities. This article summarizes laboratory main findings and proposes a series of procedures to implement the technique in the field.
{"title":"Monitoring of Moisture Content in Paste Tailings using Hyperspectral Cameras","authors":"M. Sánchez, Victorio Araya, G. Suazo","doi":"10.36487/acg_repo/2052_105","DOIUrl":"https://doi.org/10.36487/acg_repo/2052_105","url":null,"abstract":"Chile produces large amounts of tailings daily which must be safely disposed on the earth’s surface. There are a series of strategies that have been successfully used in our country to store tailings, among them are thickened and paste tailings. Paste tailings are an advantageous technique that allows for greater recovery of water while improving physical stability of the structure. Although challenges are faced worldwide when large production rates are tried to be thickened, the technique seems promising for countries like Chile where there is an ongoing water crisis. \u0000The stability of paste tailings facilities is highly influenced by water content or saturation. As consolidation occurs the tailings loses water. However, as the evaporation front takes place, the material goes from a saturated to a non-saturated state. Unsaturated paste has shown improved resistance, e.g. liquefaction resistance almost double when saturation drops below 90%. \u0000A well planned facility operation should consider the monitoring of the water content of the paste. However, this is sometimes difficult, due to the large areas that must be controlled and the danger associated with manual moisture measurements in the field. In this context, we proposed the use of hyperspectral cameras to obtain a relationship between the paste moisture content and light reflectance. This would allow to generate moisture surface map and to the use of this data to monitor for instance evaporation rates or water balance in tailings storage facilities. This article summarizes laboratory main findings and proposes a series of procedures to implement the technique in the field.","PeriodicalId":164781,"journal":{"name":"23rd International Conference on Paste, Thickened and Filtered Tailings - PASTE 2020","volume":"117-119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114351804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-02DOI: 10.36487/acg_repo/2052_10
F. Kaswalder, D. Cavalli, Idemilson Fritzke, A. Bassi
The mining industry is becoming more and more attracted to dry stacking as a method of mine tailings management. The development of bigger-sized plates now allows metal producers to utilize pressure filtration technology to process flow rates of up to 200,000 tonnes per day of dry solids, which was undreamed of just a few years ago. The advantages of this technology include very low cake moisture content, significant savings in water usage and the possibility to recover product (when required) without the need of CCD washers. The filter press technology combined with bigger-sized plates enables filters to be installed in remote sites with high average rainfalls, offering the mining company the possibility of a safer and more sustainable environmental impact, thanks to a stable stack of solid material that requires less room than traditional thickened residue dams. The aim of this presentation is to show the latest studies where this technology has been applied.
{"title":"High capacity dewatering plants","authors":"F. Kaswalder, D. Cavalli, Idemilson Fritzke, A. Bassi","doi":"10.36487/acg_repo/2052_10","DOIUrl":"https://doi.org/10.36487/acg_repo/2052_10","url":null,"abstract":"The mining industry is becoming more and more attracted to dry stacking as a method of mine tailings management. \u0000The development of bigger-sized plates now allows metal producers to utilize pressure filtration technology to process flow rates of up to 200,000 tonnes per day of dry solids, which was undreamed of just a few years ago. The advantages of this technology include very low cake moisture content, significant savings in water usage and the possibility to recover product (when required) without the need of CCD washers. \u0000The filter press technology combined with bigger-sized plates enables filters to be installed in remote sites with high average rainfalls, offering the mining company the possibility of a safer and more sustainable environmental impact, thanks to a stable stack of solid material that requires less room than traditional thickened residue dams. \u0000The aim of this presentation is to show the latest studies where this technology has been applied.","PeriodicalId":164781,"journal":{"name":"23rd International Conference on Paste, Thickened and Filtered Tailings - PASTE 2020","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127081038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-02DOI: 10.36487/acg_repo/2052_103
E. Arredondo, Victorio Araya, G. Suazo
Tailings Storage Facilities (TSF) are characterized by high moisture contents of their materials even after thickening processes. After deposition the tailings undergoes to a series of phenomena such consolidation, seepage, desiccation, etc., which results in the desaturation of the pore space. The occurrence of these phenomena is influenced by several factors, such as evaporation, contraction and surface cracking. Particularly, it has been found that the surface cracking affects evaporation rates while influencing the stability of the facility due to the desaturation of deeper soil layers. Nowadays, the assessment of water content in the field is a complex and sometimes not viable activity due to risk of personnel when moisture content is controlled manually. Knowing the moisture content can be advantageous if the stability of the facility needs to be evaluated or the water balance of the structure analyzed. So, one question that arises is: can the water content of the facility being indirectly monitored through the observations of cracks? The latter is explored in this article by conducting desiccation tests in paste tailings under temperature and field conditions of northern Chile. The slurry is desiccated until the shrinkage limit is exceeded while RGB images captured periodically and rated of evaporation monitored. The images are then processed utilizing segmentation, linear filtering, and thresholding techniques. The processed images of the laboratory samples are then compared with images captured by unmanned aerial vehicle (UAV) in a paste storage facility. Finally an index that correlates cracking and moisture content is proposed. In addition to this, a new approach to estimate shrinkage limit is proposed.
{"title":"Surface cracking in thickened tailings: mechanisms and its influence on evaporation and water contents","authors":"E. Arredondo, Victorio Araya, G. Suazo","doi":"10.36487/acg_repo/2052_103","DOIUrl":"https://doi.org/10.36487/acg_repo/2052_103","url":null,"abstract":"Tailings Storage Facilities (TSF) are characterized by high moisture contents of their materials even after thickening processes. After deposition the tailings undergoes to a series of phenomena such consolidation, seepage, desiccation, etc., which results in the desaturation of the pore space. The occurrence of these phenomena is influenced by several factors, such as evaporation, contraction and surface cracking. Particularly, it has been found that the surface cracking affects evaporation rates while influencing the stability of the facility due to the desaturation of deeper soil layers. \u0000Nowadays, the assessment of water content in the field is a complex and sometimes not viable activity due to risk of personnel when moisture content is controlled manually. Knowing the moisture content can be advantageous if the stability of the facility needs to be evaluated or the water balance of the structure analyzed. So, one question that arises is: can the water content of the facility being indirectly monitored through the observations of cracks? \u0000The latter is explored in this article by conducting desiccation tests in paste tailings under temperature and field conditions of northern Chile. The slurry is desiccated until the shrinkage limit is exceeded while RGB images captured periodically and rated of evaporation monitored. The images are then processed utilizing segmentation, linear filtering, and thresholding techniques. The processed images of the laboratory samples are then compared with images captured by unmanned aerial vehicle (UAV) in a paste storage facility. Finally an index that correlates cracking and moisture content is proposed. In addition to this, a new approach to estimate shrinkage limit is proposed.","PeriodicalId":164781,"journal":{"name":"23rd International Conference on Paste, Thickened and Filtered Tailings - PASTE 2020","volume":"128 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117149624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-02DOI: 10.36487/acg_repo/2052_79
A. Marqués, S. Oliveira, B. Paes, I. Paes, A. Coelho
Over the last few years, there has been a substantial increase in the degree of complexity of requirements regarding the licensing of tailings dams in Brazil. The stacking of filtered tailings is currently proposed as an alternative solution for tailings storage facilities; however, there are numerous challenges to understand and manage these structures in regions of high rainfall and high disposal rates. In this context, the objective of this article is to evaluate the liquefaction susceptibility of filtered iron ore tailings, based on field (piezocone) and laboratory tests (characterization and triaxial compression), both performed at an experimental landfill, located in the Iron Quadrangle (Quadrilatero Ferrifero), Minas Gerais state, Brazil. Therefore, a few methodologies were used to evaluate liquefaction susceptibility by means of the critical state theory, furthermore the fragility index of the material were also evaluated. Results indicated that the constructive method used in the experimental landfill (i.e., compaction energy, moisture and layer thickness) resulted in variability in the in-situ void ratio, indicating susceptibility to liquefaction for materials on depths greater than 0.75 m from compaction surface. In addition, from laboratory tests it was possible to determine the critical state line of the filtered tailings.
{"title":"Evaluation of the Liquefaction Susceptibility of Filtered Iron Ore Tailings from the Iron Quadrangle (Brazil)","authors":"A. Marqués, S. Oliveira, B. Paes, I. Paes, A. Coelho","doi":"10.36487/acg_repo/2052_79","DOIUrl":"https://doi.org/10.36487/acg_repo/2052_79","url":null,"abstract":"Over the last few years, there has been a substantial increase in the degree of complexity of requirements regarding the licensing of tailings dams in Brazil. The stacking of filtered tailings is currently proposed as an alternative solution for tailings storage facilities; however, there are numerous challenges to understand and manage these structures in regions of high rainfall and high disposal rates. In this context, the objective of this article is to evaluate the liquefaction susceptibility of filtered iron ore tailings, based on field (piezocone) and laboratory tests (characterization and triaxial compression), both performed at an experimental landfill, located in the Iron Quadrangle (Quadrilatero Ferrifero), Minas Gerais state, Brazil. Therefore, a few methodologies were used to evaluate liquefaction susceptibility by means of the critical state theory, furthermore the fragility index of the material were also evaluated. Results indicated that the constructive method used in the experimental landfill (i.e., compaction energy, moisture and layer thickness) resulted in variability in the in-situ void ratio, indicating susceptibility to liquefaction for materials on depths greater than 0.75 m from compaction surface. In addition, from laboratory tests it was possible to determine the critical state line of the filtered tailings.","PeriodicalId":164781,"journal":{"name":"23rd International Conference on Paste, Thickened and Filtered Tailings - PASTE 2020","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124775289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-02DOI: 10.36487/acg_repo/2052_35
Jerold Johnson, J. Vizcarra
The Chinalco Toromocho copper mine uses four (4) 43-m diameter paste-type tailings thickener, each is designed to process over 1,300 dry metric tons per hour, mtph and 3,600 cubic meters per hour, m3/h of slurry. The target non-Newtonian underflow was designed to be pumped to the tailings storage facility, TSF to be surface stacked. Difficulty has been experienced achieving the target underflow causing water balance, pumping capacity and other issues. Chinalco contracted WesTech to perform an optimization study to evaluate the benefit of retrofitting their feed system and mechanism of their thickeners with the latest advances in the market. Plant trend data was analyzed over the past 1.5 years, establishing the current operation of the site. The tailings stream variation range in dry mtph, particle size distribution, PSD, and flocculant consumption, are shown. The underflow weight percent and overflow clarity operating ranges were tracked. The analysis gives the effect these critical parameters have on thickener performance. A comparison is provided of the predicted modernization performance in response to the established operating variability. This paper provides a review of the Toromocho thickeners trend data based performance, optimization study results, and the mine’s way forward to optimize their tailings thickeners.
{"title":"Modernization of Chinalco Toromocho Copper Tailings Thickeners","authors":"Jerold Johnson, J. Vizcarra","doi":"10.36487/acg_repo/2052_35","DOIUrl":"https://doi.org/10.36487/acg_repo/2052_35","url":null,"abstract":"The Chinalco Toromocho copper mine uses four (4) 43-m diameter paste-type tailings thickener, each is designed to process over 1,300 dry metric tons per hour, mtph and 3,600 cubic meters per hour, m3/h of slurry. The target non-Newtonian underflow was designed to be pumped to the tailings storage facility, TSF to be surface stacked. Difficulty has been experienced achieving the target underflow causing water balance, pumping capacity and other issues. Chinalco contracted WesTech to perform an optimization study to evaluate the benefit of retrofitting their feed system and mechanism of their thickeners with the latest advances in the market. Plant trend data was analyzed over the past 1.5 years, establishing the current operation of the site. The tailings stream variation range in dry mtph, particle size distribution, PSD, and flocculant consumption, are shown. The underflow weight percent and overflow clarity operating ranges were tracked. The analysis gives the effect these critical parameters have on thickener performance. A comparison is provided of the predicted modernization performance in response to the established operating variability. This paper provides a review of the Toromocho thickeners trend data based performance, optimization study results, and the mine’s way forward to optimize their tailings thickeners.","PeriodicalId":164781,"journal":{"name":"23rd International Conference on Paste, Thickened and Filtered Tailings - PASTE 2020","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116631642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-02DOI: 10.36487/acg_repo/2052_20
B. Garcia, E. Wolff, J. Valderrama, Johanna Valbuena
The Gran Colombia Gold Segovia company, Colombia branch (GCGS), has a mining operation between the municipalities of Remedios and Segovia, Department of Antioquia - Colombia. The extraction material is processed at the Maria Dama Plant and the tailings are pumped to the El Chocho deposit. The original tailings deposit project contemplates two reservoirs generated by 2 earth dams, called: Upper and lower tailings storage. Phases 1A, 1B and 1C were defined in the upper tailings storage. Phase 1B is used at 100% capacity with pulp tailings, phase 1A in operation and phase 1C under construction. Technifying the sludge disposal process in phase 1A, 91 geotextile tubes (TG) were used, which are filled with tailings, adding flocculants to improve the separation of solids and subsequent water filtration. The GT were placed in the 1A containment dam in a structured manner, following the design and the corresponding technical specifications. In the specified procedure, 2 previously analyzed situations will be seen -more unwanted- however, there was an action plan in case of occurrence. The first one related to the size of the geotextile opening vs. minimum particle size. Occasionally, the pumped tailings from the treatment plant proceed with the smallest size to the opening of the geotextile. The second scenario was presented during the filling operation of a GT, which was ripped longitudinally despite its high resistance to stress and breakage. The existing barrier in the downstream zone contained the tailings. The use of GT allowed to expand the storage capacity of the tailings by replacing the loan material from the phase 1A dam with mining tailings. The current GT (1A) dam will be integrated into the downstream tailings, from the storage of filter-pressed mining tailings, ensuring the stability of the 1A dam , in the time.
{"title":"Experience with geotextile tubes in Mining Tailings Storage. Gran Colombia Gold Segovia","authors":"B. Garcia, E. Wolff, J. Valderrama, Johanna Valbuena","doi":"10.36487/acg_repo/2052_20","DOIUrl":"https://doi.org/10.36487/acg_repo/2052_20","url":null,"abstract":"The Gran Colombia Gold Segovia company, Colombia branch (GCGS), has a mining operation between the municipalities of Remedios and Segovia, Department of Antioquia - Colombia. The extraction material is processed at the Maria Dama Plant and the tailings are pumped to the El Chocho deposit. \u0000The original tailings deposit project contemplates two reservoirs generated by 2 earth dams, called: Upper and lower tailings storage. Phases 1A, 1B and 1C were defined in the upper tailings storage. Phase 1B is used at 100% capacity with pulp tailings, phase 1A in operation and phase 1C under construction. Technifying the sludge disposal process in phase 1A, 91 geotextile tubes (TG) were used, which are filled with tailings, adding flocculants to improve the separation of solids and subsequent water filtration. \u0000The GT were placed in the 1A containment dam in a structured manner, following the design and the corresponding technical specifications. In the specified procedure, 2 previously analyzed situations will be seen -more unwanted- however, there was an action plan in case of occurrence. The first one related to the size of the geotextile opening vs. minimum particle size. Occasionally, the pumped tailings from the treatment plant proceed with the smallest size to the opening of the geotextile. The second scenario was presented during the filling operation of a GT, which was ripped longitudinally despite its high resistance to stress and breakage. The existing barrier in the downstream zone contained the tailings. \u0000The use of GT allowed to expand the storage capacity of the tailings by replacing the loan material from the phase 1A dam with mining tailings. The current GT (1A) dam will be integrated into the downstream tailings, from the storage of filter-pressed mining tailings, ensuring the stability of the 1A dam , in the time.","PeriodicalId":164781,"journal":{"name":"23rd International Conference on Paste, Thickened and Filtered Tailings - PASTE 2020","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127427772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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