The purpose of the work is to obtain a heat-resistant binder with the addition of metakaolin from mineral and man-made raw materials of the Aral Sea region. The results of obtaining alumina cement using kaolin, limestone and alumina-containing waste are presented. Effective compositions of alumina cement in the kaolin-limestone-alumina-containing waste system have been developed. To improve the physico-mechanical properties of a heat-resistant binder, the preparation of metakaolin with its subsequent addition during clinker grinding was investigated. The reliability of the obtained results is confirmed by the use of modern physico-chemical methods.
{"title":"Obtaining and investigation of a heat-resistant binder with the additive of metakaolin in the conditions of Uzbekistan","authors":"Aida Ruzmetova, Zabibulla Babaev, Mirzhalil Yunusov","doi":"10.17073/1683-4518-2023-7-28-32","DOIUrl":"https://doi.org/10.17073/1683-4518-2023-7-28-32","url":null,"abstract":"The purpose of the work is to obtain a heat-resistant binder with the addition of metakaolin from mineral and man-made raw materials of the Aral Sea region. The results of obtaining alumina cement using kaolin, limestone and alumina-containing waste are presented. Effective compositions of alumina cement in the kaolin-limestone-alumina-containing waste system have been developed. To improve the physico-mechanical properties of a heat-resistant binder, the preparation of metakaolin with its subsequent addition during clinker grinding was investigated. The reliability of the obtained results is confirmed by the use of modern physico-chemical methods.","PeriodicalId":19463,"journal":{"name":"NOVYE OGNEUPORY (NEW REFRACTORIES)","volume":"979 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139204242","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 : 2023-11-30DOI: 10.17073/1683-4518-2023-7-42-51
A. E. Solovyeva
Structural changes in cerium dioxide, when heated in vacuum in the range of 25‒1600 °C, in air in the range of 25‒1500 °C, and during successive annealing in the range of 1600‒2100 °C in air, followed by quenching in water, were studied. In the crystal lattice of CeO2‒х, the F → F1 phase transformation in vacuum proceeds in the range of 1100‒1600 °C; additionally, at 1200 °C, X-ray lines of the C-type Ce2O3 phase appear. The thermal expansion coefficient of phases of the fluorite type F and F1 in the range of 25‒1500 °C in air, as well as phases of the fluorite type F, F1 and type C Ce2O3 in the range of 25‒1600 °C are determined in vacuum and their dependence on the change in the oxygen content in the CeO2‒х crystal lattice was found. The kinetic conditions for reduction of cerium dioxide in vacuum and oxidation in air are different. The cubic structure of the fluorite type F CeO2‒х, when the samples are heated in air, is preserved up to 1800 °C with the content of anionic vacancies, at 1900 °C the transformation F → F1 occurs. The formation of loops, edge and screw dislocations in the structure of cerium dioxide grains after annealing of samples in the range of 1900‒2100 °C in air were discovered for the first time. The decomposition of the structure F1 into cerium oxide phases of types F and C proceeds at 2100 °C along the height and boundaries of screw dislocations. It was found that fragments of the C-type phase of cerium oxide are located on loops along the height of screw dislocations, which indicates the movement and evaporation of these fragments. When the samples are oxidized at 1600 °C in air, the black-colored C Ce2O3‒х phase in a gradient of different concentrations moves along certain trajectories to opposite ones. grain boundaries, abuts against dislocation loops, bends them, and oxidizes to phases F1 and F. In the structure of polycrystalline cerium dioxide, when heated in vacuum and in air, certain concentrations of defects control phase transformations.
在 CeO2-х 的晶格中，真空中的 F → F1 相变在 1100-1600 ℃ 范围内进行；此外，在 1200 ℃ 时，出现了 C 型 Ce2O3 相的 X 射线。测定了 25-1500 ℃ 空气中 F 型和 F1 型萤石相的热膨胀系数，以及 25-1600 ℃ 真空中 F 型、F1 型和 C 型 Ce2O3 相的热膨胀系数，并发现了它们与 CeO2-х 晶格中氧含量变化的关系。二氧化铈在真空中还原和在空气中氧化的动力学条件是不同的。当样品在空气中加热时，F 型 CeO2-х 萤石的立方结构在 1800 ℃ 时仍保持不变，并含有阴离子空位，在 1900 ℃ 时发生 F → F1 的转变。在 1900-2100 °C的空气中退火后，二氧化铈晶粒结构中形成了环状、边缘和螺旋位错，这是首次发现。在 2100 ℃ 时，结构 F1 沿着螺旋位错的高度和边界分解成 F 型和 C 型氧化铈相。研究发现，C 型氧化铈相的碎片位于沿螺旋位错高度的环上，这表明了这些碎片的移动和蒸发。当样品在 1600 °C 的空气中氧化时，不同浓度梯度的黑色 C Ce2O3-х 相沿着一定的轨迹向相反的轨迹移动，与位错环相邻，使位错环弯曲，并氧化成 F1 和 F 相。
{"title":"The defects of structural and phase transformations in polycrystalline cerium dioxide under heating in vacuum and in air","authors":"A. E. Solovyeva","doi":"10.17073/1683-4518-2023-7-42-51","DOIUrl":"https://doi.org/10.17073/1683-4518-2023-7-42-51","url":null,"abstract":"Structural changes in cerium dioxide, when heated in vacuum in the range of 25‒1600 °C, in air in the range of 25‒1500 °C, and during successive annealing in the range of 1600‒2100 °C in air, followed by quenching in water, were studied. In the crystal lattice of CeO2‒х, the F → F1 phase transformation in vacuum proceeds in the range of 1100‒1600 °C; additionally, at 1200 °C, X-ray lines of the C-type Ce2O3 phase appear. The thermal expansion coefficient of phases of the fluorite type F and F1 in the range of 25‒1500 °C in air, as well as phases of the fluorite type F, F1 and type C Ce2O3 in the range of 25‒1600 °C are determined in vacuum and their dependence on the change in the oxygen content in the CeO2‒х crystal lattice was found. The kinetic conditions for reduction of cerium dioxide in vacuum and oxidation in air are different. The cubic structure of the fluorite type F CeO2‒х, when the samples are heated in air, is preserved up to 1800 °C with the content of anionic vacancies, at 1900 °C the transformation F → F1 occurs. The formation of loops, edge and screw dislocations in the structure of cerium dioxide grains after annealing of samples in the range of 1900‒2100 °C in air were discovered for the first time. The decomposition of the structure F1 into cerium oxide phases of types F and C proceeds at 2100 °C along the height and boundaries of screw dislocations. It was found that fragments of the C-type phase of cerium oxide are located on loops along the height of screw dislocations, which indicates the movement and evaporation of these fragments. When the samples are oxidized at 1600 °C in air, the black-colored C Ce2O3‒х phase in a gradient of different concentrations moves along certain trajectories to opposite ones. grain boundaries, abuts against dislocation loops, bends them, and oxidizes to phases F1 and F. In the structure of polycrystalline cerium dioxide, when heated in vacuum and in air, certain concentrations of defects control phase transformations.","PeriodicalId":19463,"journal":{"name":"NOVYE OGNEUPORY (NEW REFRACTORIES)","volume":"100 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139204475","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 : 2023-11-30DOI: 10.17073/1683-4518-2023-10-27-30
I. A. Datsko
.
.
{"title":"Influence of the amount of ZrO2 additive on the creep of the basic refractory","authors":"I. A. Datsko","doi":"10.17073/1683-4518-2023-10-27-30","DOIUrl":"https://doi.org/10.17073/1683-4518-2023-10-27-30","url":null,"abstract":"<jats:p>.</jats:p>","PeriodicalId":19463,"journal":{"name":"NOVYE OGNEUPORY (NEW REFRACTORIES)","volume":"127 30","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139206839","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 : 2023-11-30DOI: 10.17073/1683-4518-2023-9-52-55
Al. A. Eminov, B. T. Sobirov, A. Eminov
Optimal material and charge compositions of technical ceramics for grinding media have been developed. It has been established that the best indicators of the material composition and technological properties have prototypes of ceramic masses with alumina content from 55,25 to 64,93 wt. % for obtaining mullite ceramics, as well as 65,79 to 74,21 wt. % for obtaining mullite-corundum ceramics. The possibilities of using kaolins of various grades for the development of new compositions of grinding media for low-temperature sintering are shown.
{"title":"Composition of technical ceramics of low-temperature sintering for grinding bodies","authors":"Al. A. Eminov, B. T. Sobirov, A. Eminov","doi":"10.17073/1683-4518-2023-9-52-55","DOIUrl":"https://doi.org/10.17073/1683-4518-2023-9-52-55","url":null,"abstract":"Optimal material and charge compositions of technical ceramics for grinding media have been developed. It has been established that the best indicators of the material composition and technological properties have prototypes of ceramic masses with alumina content from 55,25 to 64,93 wt. % for obtaining mullite ceramics, as well as 65,79 to 74,21 wt. % for obtaining mullite-corundum ceramics. The possibilities of using kaolins of various grades for the development of new compositions of grinding media for low-temperature sintering are shown.","PeriodicalId":19463,"journal":{"name":"NOVYE OGNEUPORY (NEW REFRACTORIES)","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139207605","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 : 2023-11-30DOI: 10.17073/1683-4518-2023-8-60-65
N. M. Varrik, I. E. Salimov, V. Babashov, A. A. Shavnev
The article presents an overview of the existing types of binders for heat and sound insulation made of glass and mineral fibers. The interest in the development or modification of binders for the manufacture of thermal insulation used in the transport, construction, and industrial sectors is due to increased requirements for their operational characteristics, as well as fire and environmental safety requirements. Trends in the development of binders for fibrous thermal insulation materials that meet modern requirements are indicated: thermal protection systems must have sufficient strength and flexibility to maintain their integrity during manufacture, transportation and installation in target volumes, sufficient elasticity to restore volume after compression, low specific gravity, low coefficient of thermal conductivity, resistance to flame, low smoke emission and resistance to moisture gain during heating and cooling.
{"title":"Binders for materials based on glass and mineral fibers (overview)","authors":"N. M. Varrik, I. E. Salimov, V. Babashov, A. A. Shavnev","doi":"10.17073/1683-4518-2023-8-60-65","DOIUrl":"https://doi.org/10.17073/1683-4518-2023-8-60-65","url":null,"abstract":"The article presents an overview of the existing types of binders for heat and sound insulation made of glass and mineral fibers. The interest in the development or modification of binders for the manufacture of thermal insulation used in the transport, construction, and industrial sectors is due to increased requirements for their operational characteristics, as well as fire and environmental safety requirements. Trends in the development of binders for fibrous thermal insulation materials that meet modern requirements are indicated: thermal protection systems must have sufficient strength and flexibility to maintain their integrity during manufacture, transportation and installation in target volumes, sufficient elasticity to restore volume after compression, low specific gravity, low coefficient of thermal conductivity, resistance to flame, low smoke emission and resistance to moisture gain during heating and cooling.","PeriodicalId":19463,"journal":{"name":"NOVYE OGNEUPORY (NEW REFRACTORIES)","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139208857","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 : 2023-11-30DOI: 10.17073/1683-4518-2023-10-57-61
Статья Редакционная
.
.
{"title":"Finite element modeling of heat generation in a brake unit of heavy-duty tribosystems","authors":"Статья Редакционная","doi":"10.17073/1683-4518-2023-10-57-61","DOIUrl":"https://doi.org/10.17073/1683-4518-2023-10-57-61","url":null,"abstract":"<jats:p>.</jats:p>","PeriodicalId":19463,"journal":{"name":"NOVYE OGNEUPORY (NEW REFRACTORIES)","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139202436","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 : 2023-11-30DOI: 10.17073/1683-4518-2023-10-14-21
V. G. Maksimov, N. M. Varrik, V. Babashov
.
.
{"title":"Features of obtaining ceramic materials from sintering-active powders","authors":"V. G. Maksimov, N. M. Varrik, V. Babashov","doi":"10.17073/1683-4518-2023-10-14-21","DOIUrl":"https://doi.org/10.17073/1683-4518-2023-10-14-21","url":null,"abstract":"<jats:p>.</jats:p>","PeriodicalId":19463,"journal":{"name":"NOVYE OGNEUPORY (NEW REFRACTORIES)","volume":"434 21","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139204319","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 : 2023-11-30DOI: 10.17073/1683-4518-2023-9-11-15
S. Davydov, A. N. Semin
Depleted gold-containing sulfide mineral materials can be used in cement production, in the construction industry, in road construction and other sectors of the national economy. This will allow metallurgical enterprises to switch to low-waste or non-waste technology. Studies and practice of ore dressing with a high degree of sulfidity show that gold extraction is directly dependent on the degree of sulfidity of the ore and the content of the main ore sulfide minerals in it. To increase the efficiency of gold extraction, a device for enriching gold-containing sulfide materials using centrifugal flotation is proposed
{"title":"Thermal enrichment of gold- bearing sulfide mineral material using centrifugal flotation","authors":"S. Davydov, A. N. Semin","doi":"10.17073/1683-4518-2023-9-11-15","DOIUrl":"https://doi.org/10.17073/1683-4518-2023-9-11-15","url":null,"abstract":"Depleted gold-containing sulfide mineral materials can be used in cement production, in the construction industry, in road construction and other sectors of the national economy. This will allow metallurgical enterprises to switch to low-waste or non-waste technology. Studies and practice of ore dressing with a high degree of sulfidity show that gold extraction is directly dependent on the degree of sulfidity of the ore and the content of the main ore sulfide minerals in it. To increase the efficiency of gold extraction, a device for enriching gold-containing sulfide materials using centrifugal flotation is proposed","PeriodicalId":19463,"journal":{"name":"NOVYE OGNEUPORY (NEW REFRACTORIES)","volume":"54 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139207805","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 : 2023-11-30DOI: 10.17073/1683-4518-2023-9-3-10
V. Sokolov, S. Kirov, M. Gasparyan
The properties of the glass phase of fused refractories containing 28‒94 % ZrO2 are given. The influence of the glass phase composition on the main performance properties of refractories ― corrosion resistance and tendency to release defects is considered. It is shown that a decrease in the amount of glass phase in fused baddeleyite-corundum refractories with a simultaneous increase in the amount of ZrO2 leads to an increase in their corrosion resistance and complication of the annealing conditions of products. The properties of the glass phase, which determine the tendency of refractories to release defects, depend mainly on the SiO2 : Na2O, the purity of raw materials and the method of melting the charge. Oxidative melting with the treatment of the melt with an oxygen-gas mixture is a prerequisite for the formation of a refractory glass phase in refractories and the production of products with a low tendency to the release of defects.
{"title":"The influence of the glass phase of fused refractories on their operational and technological properties","authors":"V. Sokolov, S. Kirov, M. Gasparyan","doi":"10.17073/1683-4518-2023-9-3-10","DOIUrl":"https://doi.org/10.17073/1683-4518-2023-9-3-10","url":null,"abstract":"The properties of the glass phase of fused refractories containing 28‒94 % ZrO2 are given. The influence of the glass phase composition on the main performance properties of refractories ― corrosion resistance and tendency to release defects is considered. It is shown that a decrease in the amount of glass phase in fused baddeleyite-corundum refractories with a simultaneous increase in the amount of ZrO2 leads to an increase in their corrosion resistance and complication of the annealing conditions of products. The properties of the glass phase, which determine the tendency of refractories to release defects, depend mainly on the SiO2 : Na2O, the purity of raw materials and the method of melting the charge. Oxidative melting with the treatment of the melt with an oxygen-gas mixture is a prerequisite for the formation of a refractory glass phase in refractories and the production of products with a low tendency to the release of defects.","PeriodicalId":19463,"journal":{"name":"NOVYE OGNEUPORY (NEW REFRACTORIES)","volume":" 43","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139197613","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 : 2023-11-30DOI: 10.17073/1683-4518-2023-6-62-66
E. V. Stepanova, V. G. Maximov, Yu.A. Ivakhnenko
The present article discusses ceramic fibers of refractory oxides used as the main components of heat-resistant refractory materials. Obviously, external defects affect the mechanical characteristics of refractory oxide ceramic fibers. In this regard, using optical and electron microscopy, the morphology of the surface of ceramic fibers was investigated, defects were classified, analysis was carried out, the causes of their occurrence were established and methods for their elimination were proposed.
{"title":"Surface defects and shape defects of ceramic fibers from refractory oxides","authors":"E. V. Stepanova, V. G. Maximov, Yu.A. Ivakhnenko","doi":"10.17073/1683-4518-2023-6-62-66","DOIUrl":"https://doi.org/10.17073/1683-4518-2023-6-62-66","url":null,"abstract":"The present article discusses ceramic fibers of refractory oxides used as the main components of heat-resistant refractory materials. Obviously, external defects affect the mechanical characteristics of refractory oxide ceramic fibers. In this regard, using optical and electron microscopy, the morphology of the surface of ceramic fibers was investigated, defects were classified, analysis was carried out, the causes of their occurrence were established and methods for their elimination were proposed.","PeriodicalId":19463,"journal":{"name":"NOVYE OGNEUPORY (NEW REFRACTORIES)","volume":"78 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139201877","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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