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Chemical and Mineral Composition of Rhyolite from the Kizilskoe Deposit 克孜勒斯科耶矿床流纹岩化学与矿物组成
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-10-05 DOI: 10.1134/S0040579526700387
E. N. Pechenkina, E. I. Berbekova, S. V. Fomichev, V. A. Krenev, D. F. Kondakov, A. A. Mikhailov
{"title":"Chemical and Mineral Composition of Rhyolite from the Kizilskoe Deposit","authors":"E. N. Pechenkina,&nbsp;E. I. Berbekova,&nbsp;S. V. Fomichev,&nbsp;V. A. Krenev,&nbsp;D. F. Kondakov,&nbsp;A. A. Mikhailov","doi":"10.1134/S0040579526700387","DOIUrl":"10.1134/S0040579526700387","url":null,"abstract":"<p><b>Abstract</b>—Based on the chemical composition of rhyolite from the Kizilskoe deposit, determined by electron probe microanalysis, and using the SELECTOR-S information and computing system, a computer physicochemical model of the formation of this rock was created and its mineral composition was calculated, which was confirmed by X-ray powder diffraction analysis.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 2","pages":"243 - 247"},"PeriodicalIF":0.4,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098275","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}
引用次数: 0
Optimization of Cerium Carbonate Precipitation from Nitric Acid Solutions 硝酸溶液沉淀碳酸铈的工艺优化
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-10-05 DOI: 10.1134/S0040579526700405
E. V. Bogatyreva, A. I. Kartasheva
{"title":"Optimization of Cerium Carbonate Precipitation from Nitric Acid Solutions","authors":"E. V. Bogatyreva,&nbsp;A. I. Kartasheva","doi":"10.1134/S0040579526700405","DOIUrl":"10.1134/S0040579526700405","url":null,"abstract":"<p><b>Abstract</b>—The conditions of cerium carbonate precipitation from nitric acid solutions with a saturated ammonium carbonate solution were optimized to obtain easily filterable pulps using mathematical methods of experimental design, namely, steepest ascent method and full factorial experiment. It was experimentally determined that it is possible to obtain easily filterable cerium carbonate pulps at a specific filtration rate of at least 1700 L/(m<sup>2</sup> h) by single-stage precipitation from nitric acid solutions of cerium with at least 100 g/L Ce<sub>2</sub>O<sub>3</sub>, at least 90 g/L NH<sub>4</sub>NO<sub>3</sub>, and pH 1.5–2.0 with a saturated ammonium carbonate solution.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 2","pages":"253 - 262"},"PeriodicalIF":0.4,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098614","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}
引用次数: 0
Technological Efficiency of Reverse Osmosis Treatment of Chromium-Containing Industrial Solutions 反渗透处理含铬工业溶液的技术效率
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-10-05 DOI: 10.1134/S0040579526700685
O. A. Abonosimov, S. I. Lazarev, N. V. Shel’, V. A. Gorshenina
{"title":"Technological Efficiency of Reverse Osmosis Treatment of Chromium-Containing Industrial Solutions","authors":"O. A. Abonosimov,&nbsp;S. I. Lazarev,&nbsp;N. V. Shel’,&nbsp;V. A. Gorshenina","doi":"10.1134/S0040579526700685","DOIUrl":"10.1134/S0040579526700685","url":null,"abstract":"<p>The prospects of implementing reverse osmosis technology for the treatment of industrial wastewater contaminated with chromium during electroplating operations were evaluated. The experimental part of the work included a comprehensive analysis of the effects of various factors on the main process parameters. The characteristics of the solvent flux and the purification efficiency were studied using MGA-80 and MGA-95 membranes. The experiments were carried out under industrial conditions for the treatment of water containing chromium compounds. The developed technology and a modernized process flow scheme for the treatment of process water from electroplating production are proposed for practical application.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 2","pages":"421 - 427"},"PeriodicalIF":0.4,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098625","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}
引用次数: 0
Effect of Heat Treatment Time on the Mechanical Properties of Basalt Fiber Composite Material 热处理时间对玄武岩纤维复合材料力学性能的影响
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-10-05 DOI: 10.1134/S0040579526700521
E. N. Pechenkina, E. I. Berbekova, S. V. Fomichev, V. A. Krenev
{"title":"Effect of Heat Treatment Time on the Mechanical Properties of Basalt Fiber Composite Material","authors":"E. N. Pechenkina,&nbsp;E. I. Berbekova,&nbsp;S. V. Fomichev,&nbsp;V. A. Krenev","doi":"10.1134/S0040579526700521","DOIUrl":"10.1134/S0040579526700521","url":null,"abstract":"<p><b>Abstract</b>—The process of producing ceramics from gabbro rock, as well as a composite material from this rock with a basalt fiber matrix, was studied. Heat treatment was carried out at 1000°C at holding times of 30, 60, 120, 180, 240, and 360 min. The mechanical properties of the specimens were determined (pycnometric density, Brinell hardness, tensile strength, and compression set).</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 2","pages":"315 - 317"},"PeriodicalIF":0.4,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098634","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}
引用次数: 0
Removal of Impurities from Uranium Product via Crystallization Refining in a Linear Crystallizer 在直线结晶器中进行结晶精炼以去除铀产品中的杂质
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-10-05 DOI: 10.1134/S0040579526700624
V. A. Kashcheev, A. A. Kulichenko, V. V. Tinin
{"title":"Removal of Impurities from Uranium Product via Crystallization Refining in a Linear Crystallizer","authors":"V. A. Kashcheev,&nbsp;A. A. Kulichenko,&nbsp;V. V. Tinin","doi":"10.1134/S0040579526700624","DOIUrl":"10.1134/S0040579526700624","url":null,"abstract":"<p><b>Abstract</b>—The paper presents a mathematical model describing the redistribution of impurities present in the initial uranium melt (a highly concentrated nitric solution of uranium) as dissolved impurity ions, between the solid and liquid phases in the working zones of a linear crystallizer during crystallization refining of the uranium product. The results obtained allow one to assess the degree of purification of the final crystalline uranium product (uranyl nitrate hexahydrate, UNH) from impurities as a function of the impurity distribution coefficient between the liquid and solid phases under various operating modes of the linear crystallizer. The presented results can be used to optimize the operating regime of the linear crystallizer as a unit within the technological chain for spent nuclear fuel (SNF) reprocessing.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 2","pages":"374 - 380"},"PeriodicalIF":0.4,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149097994","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}
引用次数: 0
Influence of Ammonia Vapor on the Catalytic Removal of N2O from Air Streams 氨蒸汽对气流中N2O催化去除的影响
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-10-05 DOI: 10.1134/S0040579526700363
S. A. Kulyukhin, A. A. Bessonov
{"title":"Influence of Ammonia Vapor on the Catalytic Removal of N2O from Air Streams","authors":"S. A. Kulyukhin,&nbsp;A. A. Bessonov","doi":"10.1134/S0040579526700363","DOIUrl":"10.1134/S0040579526700363","url":null,"abstract":"<p>The process of selective catalytic reduction of N<sub>2</sub>O with NH<sub>3</sub> vapor in an air stream over γ-Al<sub>2</sub>O<sub>3</sub>-based composite materials containing Co, Ni, Fe, Mg, Ru, and Ag compounds was studied at 523–528 K. It was found that, for composites containing Mg, Ni, Co, Fe, and Ru compounds, the introduction of NH<sub>3</sub> vapor into the gas stream resulted in an N<sub>2</sub>O decomposition degree of 3.5–7.9%. In contrast, for Ag-containing composites, the presence of NH<sub>3</sub> vapor led not to a decrease but to a significant increase in the amount of N<sub>2</sub>O in the gas phase. The amount of N<sub>2</sub>O in the gas phase increased by 25–86%. This effect is apparently associated with the oxidation of NH<sub>3</sub> by atmospheric oxygen in the presence of metal-containing composites according to the reaction: 2NH<sub>3</sub> + 2O<sub>2</sub> = N<sub>2</sub>O + 3H<sub>2</sub>O.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 2","pages":"231 - 236"},"PeriodicalIF":0.4,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098059","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}
引用次数: 0
Codeposition of a Nickel–Vanadium Alloy from a Sulfate–Chloride Electrolyte 硫酸盐-氯化物电解质共沉积镍钒合金
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-10-05 DOI: 10.1134/S0040579526700399
N. D. Solov’eva, I. I. Frolova, S. G. Kondrashov, D. A. Tikhonov, I. A. Frolov
{"title":"Codeposition of a Nickel–Vanadium Alloy from a Sulfate–Chloride Electrolyte","authors":"N. D. Solov’eva,&nbsp;I. I. Frolova,&nbsp;S. G. Kondrashov,&nbsp;D. A. Tikhonov,&nbsp;I. A. Frolov","doi":"10.1134/S0040579526700399","DOIUrl":"10.1134/S0040579526700399","url":null,"abstract":"<p>Codeposition of nickel and vanadium from a sulfate–chloride nickel-plating electrolyte containing vanadium oxoanions was studied. The influence of adsorption processes at the phase boundary on alloy codeposition was determined, and the adsorption of electroactive species was calculated. The role of electrochemically reduced H<sub>2</sub> in coating formation is proposed. The vanadium content in the deposit was shown to depend on the cathodic current density and to be retained in the film of the deposited coating firmly adhered to the steel substrate after polishing of the obtained deposit. The codeposited coating increases the corrosion resistance of the steel product at a coating thickness of 6–8 μm.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 2","pages":"248 - 252"},"PeriodicalIF":0.4,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098276","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}
引用次数: 0
Study of Processing of Molybdenum Concentrate with Caustic Soda in the Absence of Air 无空气条件下烧碱处理钼精矿的研究
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-10-05 DOI: 10.1134/S0040579526700594
E. M. Nazaryan, A. G. Arustamyan, A. A. Hakobyan, E. S. Aghamyan, A. M. Arakelyan, J. S. Mazmanyan, M. S. Sargsyan, V. R. Harutyunyan, N. B. Knyazyan
{"title":"Study of Processing of Molybdenum Concentrate with Caustic Soda in the Absence of Air","authors":"E. M. Nazaryan,&nbsp;A. G. Arustamyan,&nbsp;A. A. Hakobyan,&nbsp;E. S. Aghamyan,&nbsp;A. M. Arakelyan,&nbsp;J. S. Mazmanyan,&nbsp;M. S. Sargsyan,&nbsp;V. R. Harutyunyan,&nbsp;N. B. Knyazyan","doi":"10.1134/S0040579526700594","DOIUrl":"10.1134/S0040579526700594","url":null,"abstract":"<p>The processing of molybdenum concentrate by roasting with caustic soda in the absence of air was investigated with recovery of the principal components, molybdenum and sulfur. After leaching and filtration of the roasted product, molybdenum was recovered in the filtrate as Na<sub>2</sub>MoO<sub>4</sub>, whereas sulfur was recovered as Na<sub>2</sub>S. The process completely eliminates the emission of sulfur-containing gases into the atmosphere.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 2","pages":"354 - 357"},"PeriodicalIF":0.4,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098445","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}
引用次数: 0
Technology for Application of a New Proton Magnetic Resonance Relaxometer for Rapid Monitoring of Oils and Gas Condensate 新型质子磁共振弛豫仪在油气凝析油快速监测中的应用技术
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-10-05 DOI: 10.1134/S0040579526700697
Nguyen Duc Anh, E. V. Shmidt, V. L. Matukhin, R. S. Kashaev
{"title":"Technology for Application of a New Proton Magnetic Resonance Relaxometer for Rapid Monitoring of Oils and Gas Condensate","authors":"Nguyen Duc Anh,&nbsp;E. V. Shmidt,&nbsp;V. L. Matukhin,&nbsp;R. S. Kashaev","doi":"10.1134/S0040579526700697","DOIUrl":"10.1134/S0040579526700697","url":null,"abstract":"<p><b>Abstract</b>—Using a newly developed relaxometer based on the proton magnetic resonance relaxometry (PMRR) method, a technology is proposed for rapid monitoring of the properties of oils from the Romashkino field and the Bach Ho and Ca Ngu Vang fields, as well as the Tien Hai (Vietnam) gas condensate. The technology includes measurements of the temperature dependences of spin‑lattice and spin‑spin relaxation times and of proton population densities to determine asphaltene concentrations and activation energies of molecular motion in order to predict the likelihood of asphaltene–resin–paraffin deposit formation and ways to prevent it, and to determine optimal temperatures for oil conditioning and pumping.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 2","pages":"428 - 433"},"PeriodicalIF":0.4,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098525","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}
引用次数: 0
Effect of NaOH on the Synthesis of Cobalt-Doped Willemite 氢氧化钠对钴掺杂willeite合成的影响
IF 0.4 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2026-10-05 DOI: 10.1134/S0040579526700582
N. O. Zulumyan, V. A. Sarkeziyan, A. M. Kazanchyan, I. A. Petrosyan, V. G. Stepanyan, M. A. Balayan, A. A. Kirakosyan
{"title":"Effect of NaOH on the Synthesis of Cobalt-Doped Willemite","authors":"N. O. Zulumyan,&nbsp;V. A. Sarkeziyan,&nbsp;A. M. Kazanchyan,&nbsp;I. A. Petrosyan,&nbsp;V. G. Stepanyan,&nbsp;M. A. Balayan,&nbsp;A. A. Kirakosyan","doi":"10.1134/S0040579526700582","DOIUrl":"10.1134/S0040579526700582","url":null,"abstract":"<p>The interaction of ZnO with hydrosilica gel in the presence of a limited amount of NaOH and the doping of the resulting compounds with cobalt were studied. It was shown that only the molar ratio ν(NaOH)/ν(ZnO)/ν(CoCl<sub>2</sub>) = 1/1.5/0.5 at 900°C leads to the formation of cobalt-doped α-Zn<sub>2</sub>SiO<sub>4</sub>. When the molar fraction of NaOH is less than unity, partial formation of cobalt-doped willemite occurs at 900°C simultaneously with doping of the unreacted ZnO. The most intense colors were observed at ν(NaOH)/ν(ZnO)/ν(CoCl<sub>2</sub>) ratios of 0.6/1.7/0.3 and 0.8/1.6/0.4.</p>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"60 2","pages":"345 - 353"},"PeriodicalIF":0.4,"publicationDate":"2026-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098280","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}
引用次数: 0
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