Pub Date : 2024-12-16DOI: 10.1134/S0040579524700738
L. M. Karimova, A. S. Korabaev, T. O. Oleinikova, I. V. Terent’eva, A. M. Magaz
Studies of gold leaching from a roasted gravity concentrate derived from a refractory gold-bearing ore from the Akzhal deposit (Republic of Kazakhstan) are carried out. The gravity concentrate obtained has a yield of 7.47%, a gold content of 21.3 g/t, and a recovery of 65.15% from the –0.071 mm class ore ground to 70%. The major minerals in the concentrate sample are quartz, albite, muscovite, arsenopyrite, pyrite, organic matter, and calcium oxides. In the process of oxidative roasting, the sulfides are completely oxidized. Partial functions are derived for the Jin Chan and NaCN reagent concentration, leaching time, and grinding fineness, along with the generalized equation used to calculate the rate of gold leaching from the roasted concentrate.
{"title":"Studying the Process of Gold Leaching after the Oxidative Roasting of a Refractory Gold-Bearing Concentrate","authors":"L. M. Karimova, A. S. Korabaev, T. O. Oleinikova, I. V. Terent’eva, A. M. Magaz","doi":"10.1134/S0040579524700738","DOIUrl":"10.1134/S0040579524700738","url":null,"abstract":"<div><p>Studies of gold leaching from a roasted gravity concentrate derived from a refractory gold-bearing ore from the Akzhal deposit (Republic of Kazakhstan) are carried out. The gravity concentrate obtained has a yield of 7.47%, a gold content of 21.3 g/t, and a recovery of 65.15% from the –0.071 mm class ore ground to 70%. The major minerals in the concentrate sample are quartz, albite, muscovite, arsenopyrite, pyrite, organic matter, and calcium oxides. In the process of oxidative roasting, the sulfides are completely oxidized. Partial functions are derived for the Jin Chan and NaCN reagent concentration, leaching time, and grinding fineness, along with the generalized equation used to calculate the rate of gold leaching from the roasted concentrate.</p></div>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 2","pages":"444 - 449"},"PeriodicalIF":0.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-16DOI: 10.1134/S0040579524700222
S. I. Ivannikov, N. S. Markin, N. V. Polyakova, Yu. I. Shashina, D. Kh. Shlyk, L. A. Zemskova
Abstract—It is shown that the scandium content in ash and slag waste can be determined and the efficiency of individual ash-processing operations can be monitored by the method of instrumental neutron-activation analysis. The results of determining the content of scandium and the elemental composition of ash and slag waste from thermal power plants and intermediate products of their processing are given. An increased content of scandium in the magnetic fraction of ash is established.
{"title":"Capabilities of an Instrumental Neutron-Activation Analysis for Determination of Scandium and Its Controlled Extraction from CHPP Ash Dumps","authors":"S. I. Ivannikov, N. S. Markin, N. V. Polyakova, Yu. I. Shashina, D. Kh. Shlyk, L. A. Zemskova","doi":"10.1134/S0040579524700222","DOIUrl":"10.1134/S0040579524700222","url":null,"abstract":"<div><p><b>Abstract</b>—It is shown that the scandium content in ash and slag waste can be determined and the efficiency of individual ash-processing operations can be monitored by the method of instrumental neutron-activation analysis. The results of determining the content of scandium and the elemental composition of ash and slag waste from thermal power plants and intermediate products of their processing are given. An increased content of scandium in the magnetic fraction of ash is established.</p></div>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 1","pages":"114 - 121"},"PeriodicalIF":0.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-16DOI: 10.1134/S004057952470060X
T. G. Korotkova, S. A. Bushumov
The results of studying the static sorption of petroleum products from the aqueous phase by a sorbent made from ash-and-slag waste of the thermal power industry by drying at 110°C and annealing at 600°C are given. The operating range of pollution of the aquatic environment with petroleum products is determined, the lower value of which is 0.5 mg/L and the upper value is 300 mg/L with a sorbent dose of 5 g/L. The efficiency of oil-product extraction is 95% for a sorption time of 2 min with rotation speed of the mixing device of 200 rpm.
{"title":"Static Sorption of Petroleum Products by a Sorbent Made from Ash-and-Slag Waste of the Thermal Power Industry","authors":"T. G. Korotkova, S. A. Bushumov","doi":"10.1134/S004057952470060X","DOIUrl":"10.1134/S004057952470060X","url":null,"abstract":"<div><p>The results of studying the static sorption of petroleum products from the aqueous phase by a sorbent made from ash-and-slag waste of the thermal power industry by drying at 110°C and annealing at 600°C are given. The operating range of pollution of the aquatic environment with petroleum products is determined, the lower value of which is 0.5 mg/L and the upper value is 300 mg/L with a sorbent dose of 5 g/L. The efficiency of oil-product extraction is 95% for a sorption time of 2 min with rotation speed of the mixing device of 200 rpm.</p></div>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 2","pages":"363 - 369"},"PeriodicalIF":0.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-16DOI: 10.1134/S0040579524700398
E. N. Pechenkina, V. A. Krenev, S. V. Fomichev, E. I. Berbekova, D. F. Kondakov
Based on the results of chemical analysis of dolerite from the Dergamysh deposit by the ACP-OES method using the SELECTOR-S information and computing complex, a physicochemical model of the formation of this rock (dolerite) is constructed, and its mineral composition is calculated, which is confirmed by the results of X-ray phase analysis. Based on the found mineral composition, a method for using dolerite to obtain mineral fibers is proposed.
{"title":"Chemical and Mineral Composition of Dolerite of the Dergamysh Deposit","authors":"E. N. Pechenkina, V. A. Krenev, S. V. Fomichev, E. I. Berbekova, D. F. Kondakov","doi":"10.1134/S0040579524700398","DOIUrl":"10.1134/S0040579524700398","url":null,"abstract":"<div><p>Based on the results of chemical analysis of dolerite from the Dergamysh deposit by the <i>ACP-</i>OES method using the SELECTOR-S information and computing complex, a physicochemical model of the formation of this rock (dolerite) is constructed, and its mineral composition is calculated, which is confirmed by the results of X-ray phase analysis. Based on the found mineral composition, a method for using dolerite to obtain mineral fibers is proposed.</p></div>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 2","pages":"240 - 242"},"PeriodicalIF":0.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-16DOI: 10.1134/S004057952470043X
A. S. Gnedenkov, S. L. Sinebryukhov, V. S. Filonina, S. V. Gnedenkov
A method of surface modification of the MA8 bioresorbable magnesium alloy (Mg–Mn–Ce) is developed. This method is based on the formation of hybrid coatings containing an organic biocompatible corrosion inhibitor and a bioresorbable polymer material. The anticorrosion properties of the formed coatings are studied in a physiological solution (0.9 wt % NaCl) and Hanks’ solution. Such layers reduce the alloy degradation rate due to the active protection function.
{"title":"New Hybrid Coatings for Controlling the Degradation Rate of MA8 Magnesium Alloy","authors":"A. S. Gnedenkov, S. L. Sinebryukhov, V. S. Filonina, S. V. Gnedenkov","doi":"10.1134/S004057952470043X","DOIUrl":"10.1134/S004057952470043X","url":null,"abstract":"<div><p>A method of surface modification of the MA8 bioresorbable magnesium alloy (Mg–Mn–Ce) is developed. This method is based on the formation of hybrid coatings containing an organic biocompatible corrosion inhibitor and a bioresorbable polymer material. The anticorrosion properties of the formed coatings are studied in a physiological solution (0.9 wt % NaCl) and Hanks’ solution. Such layers reduce the alloy degradation rate due to the active protection function.</p></div>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 2","pages":"266 - 276"},"PeriodicalIF":0.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-16DOI: 10.1134/S0040579524700167
V. A. Revina, V. N. Verezhnikov, I. N. Pugacheva, L. V. Molokanova, V. A. Sedykh, S. S. Nikulin
The use of taurine (2-aminoethane-1-sulfonic acid) to reduce the aggregative stability of dispersed systems is considered. It is shown that the consumption of taurine required to isolate rubber from latex is associated with the consumption of sulfuric acid. The best temperature regime for coagulation is 0–2°C. The best results are obtained when using a hybrid coagulant, sodium chloride–taurine, to isolate rubber from latex.
{"title":"Prospects of Using Taurine in the Production of Emulsion Rubbers","authors":"V. A. Revina, V. N. Verezhnikov, I. N. Pugacheva, L. V. Molokanova, V. A. Sedykh, S. S. Nikulin","doi":"10.1134/S0040579524700167","DOIUrl":"10.1134/S0040579524700167","url":null,"abstract":"<div><p>The use of taurine (2-aminoethane-1-sulfonic acid) to reduce the aggregative stability of dispersed systems is considered. It is shown that the consumption of taurine required to isolate rubber from latex is associated with the consumption of sulfuric acid. The best temperature regime for coagulation is 0–2°C. The best results are obtained when using a hybrid coagulant, sodium chloride–taurine, to isolate rubber from latex.</p></div>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 1","pages":"76 - 80"},"PeriodicalIF":0.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-16DOI: 10.1134/S0040579524700234
D. V. Maiorov, M. V. Maslova
Abstract—The raw-material base and the manufacture of zirconium, niobium, and rare-earth products in Russia are briefly reviewed. The prospects for their manufacture on the basis of the integrated processing of eudialyte are shown. The main methods of the acidic processing of this mineral are considered. The results of studying the kinetics of decomposition of eudialyte with hydrochloric and sulfuric acids are given. It is established that the process of acidic decomposition of eudialyte can be described with a high degree of accuracy by the formal equation d(1 – α)/dτ = –k(1 – α)2 for the conversion rate, from which the activation energies of the processes are determined (79.69 and 48.90 kJ/mol for HCl and H2SO4, respectively). Based on the topochemical kinetic equations describing various types, mechanisms, and geometric models of solid-phase reactions, the experimental data are mathematically processed. It is established that the mechanism of acidic decomposition of eudialyte is most accurately described by the equation (1 – 2α/3 – 1 –α)2/3 = kGBτ) for the Ginstling–Brounschtein diffusion-controlled process.
{"title":"A Study of the Process Kinetics of Acidic Decomposition of Eudialyte","authors":"D. V. Maiorov, M. V. Maslova","doi":"10.1134/S0040579524700234","DOIUrl":"10.1134/S0040579524700234","url":null,"abstract":"<p><b>Abstract</b>—The raw-material base and the manufacture of zirconium, niobium, and rare-earth products in Russia are briefly reviewed. The prospects for their manufacture on the basis of the integrated processing of eudialyte are shown. The main methods of the acidic processing of this mineral are considered. The results of studying the kinetics of decomposition of eudialyte with hydrochloric and sulfuric acids are given. It is established that the process of acidic decomposition of eudialyte can be described with a high degree of accuracy by the formal equation <i>d</i>(1 – α)/<i>d</i>τ = –<i>k</i>(1 – α)<sup>2</sup> for the conversion rate, from which the activation energies of the processes are determined (79.69 and 48.90 kJ/mol for HCl and H<sub>2</sub>SO<sub>4</sub>, respectively). Based on the topochemical kinetic equations describing various types, mechanisms, and geometric models of solid-phase reactions, the experimental data are mathematically processed. It is established that the mechanism of acidic decomposition of eudialyte is most accurately described by the equation (1 – 2α/3 – 1 –α)<sup>2/3</sup> = <i>k</i><sub>GB</sub>τ) for the Ginstling–Brounschtein diffusion-controlled process.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 1","pages":"122 - 131"},"PeriodicalIF":0.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-16DOI: 10.1134/S0040579524700386
P. E. Tyulyagin, A. A. Steshenko, A. S. Polyakova, N. M. Murashova
A method for the chemical polishing of metals using a nanostructured system of inverse sodium dodecyl sulfate–butanol-1–kerosene–aqueous acid solution microemulsions is proposed. The boundaries of the areas where microemulsions can exist in this system are shown. The acid concentrations enabling the polishing of copper and aluminum are selected. The conditions providing a decrease of up to 20% in the average roughness of these metals are determined.
{"title":"Synthesis and Structural Study of Sodium Dodecyl Sulfate–Butanol-1–Kerosene–Aqueous Acid Solution Emulsions Suitable for the Chemical Polishing of Copper and Aluminum Surfaces","authors":"P. E. Tyulyagin, A. A. Steshenko, A. S. Polyakova, N. M. Murashova","doi":"10.1134/S0040579524700386","DOIUrl":"10.1134/S0040579524700386","url":null,"abstract":"<div><p>A method for the chemical polishing of metals using a nanostructured system of inverse sodium dodecyl sulfate–butanol-1–kerosene–aqueous acid solution microemulsions is proposed. The boundaries of the areas where microemulsions can exist in this system are shown. The acid concentrations enabling the polishing of copper and aluminum are selected. The conditions providing a decrease of up to 20% in the average roughness of these metals are determined.</p></div>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 2","pages":"233 - 239"},"PeriodicalIF":0.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-16DOI: 10.1134/S0040579524700052
E. A. Frolova, D. F. Kondakov, V. P. Danilov
Phase equilibria in Ca(NO3)2–C2H5OH–H2O system sections and anti-icing properties of calcium nitrate–ethanol compositions with a component ratio from 1 : 3 to 3 : 1 are studied. The temperatures and composition of eutectics with ice and the melting ability of nitrate–ethanol compositions at temperatures of –5 and –10°C are determined. The compositions characterized by good anti-icing properties are revealed.
{"title":"Anti-Icing Properties of Calcium Nitrate–Ethanol–Water Compositions at Temperatures below 0°C","authors":"E. A. Frolova, D. F. Kondakov, V. P. Danilov","doi":"10.1134/S0040579524700052","DOIUrl":"10.1134/S0040579524700052","url":null,"abstract":"<div><p>Phase equilibria in Ca(NO<sub>3</sub>)<sub>2</sub>–C<sub>2</sub>H<sub>5</sub>OH–H<sub>2</sub>O system sections and anti-icing properties of calcium nitrate–ethanol compositions with a component ratio from 1 : 3 to 3 : 1 are studied. The temperatures and composition of eutectics with ice and the melting ability of nitrate–ethanol compositions at temperatures of –5 and –10°C are determined. The compositions characterized by good anti-icing properties are revealed.</p></div>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 1","pages":"22 - 24"},"PeriodicalIF":0.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-12-16DOI: 10.1134/S0040579524700404
G. G. Vinokurov, N. F. Struchkov, A. K. Kychkin, M. P. Lebedev
Statistical regularities of porosity formation during climatic tests of plane-parallel composite materials are revealed. To predict changes in the physical and mechanical properties of composite materials, it is proposed to use the Balshin–Huttig relationship of dimensionless properties and porosity. Taking into account experimental data on the porosity of plane-parallel basalt-plastic and fiberglass composite materials, calculations are made to reduce their physical and mechanical properties.
{"title":"Statistical Regularities of Forming Porosity in Plane-Parallel Basalt-Plastic Composite Materials during Climatic Degradation and Forecasting Their Properties","authors":"G. G. Vinokurov, N. F. Struchkov, A. K. Kychkin, M. P. Lebedev","doi":"10.1134/S0040579524700404","DOIUrl":"10.1134/S0040579524700404","url":null,"abstract":"<div><p>Statistical regularities of porosity formation during climatic tests of plane-parallel composite materials are revealed. To predict changes in the physical and mechanical properties of composite materials, it is proposed to use the Balshin–Huttig relationship of dimensionless properties and porosity. Taking into account experimental data on the porosity of plane-parallel basalt-plastic and fiberglass composite materials, calculations are made to reduce their physical and mechanical properties.</p></div>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 2","pages":"243 - 249"},"PeriodicalIF":0.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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