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A Study of the Process Kinetics of Acidic Decomposition of Eudialyte
IF 0.7 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2024-12-16 DOI: 10.1134/S0040579524700234
D. V. Maiorov, M. V. Maslova
{"title":"A Study of the Process Kinetics of Acidic Decomposition of Eudialyte","authors":"D. V. Maiorov,&nbsp;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}
引用次数: 0
Prospects of Using Taurine in the Production of Emulsion Rubbers 使用牛磺酸生产乳液橡胶的前景
IF 0.7 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2024-12-16 DOI: 10.1134/S0040579524700167
V. A. Revina, V. N. Verezhnikov, I. N. Pugacheva, L. V. Molokanova, V. A. Sedykh, S. S. Nikulin
{"title":"Prospects of Using Taurine in the Production of Emulsion Rubbers","authors":"V. A. Revina,&nbsp;V. N. Verezhnikov,&nbsp;I. N. Pugacheva,&nbsp;L. V. Molokanova,&nbsp;V. A. Sedykh,&nbsp;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}
引用次数: 0
Studying the Process of Gold Leaching after the Oxidative Roasting of a Refractory Gold-Bearing Concentrate 研究难熔含金精矿氧化焙烧后的金浸出过程
IF 0.7 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2024-12-16 DOI: 10.1134/S0040579524700738
L. M. Karimova, A. S. Korabaev, T. O. Oleinikova, I. V. Terent’eva, A. M. Magaz
{"title":"Studying the Process of Gold Leaching after the Oxidative Roasting of a Refractory Gold-Bearing Concentrate","authors":"L. M. Karimova,&nbsp;A. S. Korabaev,&nbsp;T. O. Oleinikova,&nbsp;I. V. Terent’eva,&nbsp;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}
引用次数: 0
Capabilities of an Instrumental Neutron-Activation Analysis for Determination of Scandium and Its Controlled Extraction from CHPP Ash Dumps 从 CHPP 灰渣堆中测定钪及其受控提取的仪器中子活化分析能力
IF 0.7 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2024-12-16 DOI: 10.1134/S0040579524700222
S. I. Ivannikov, N. S. Markin, N. V. Polyakova, Yu. I. Shashina, D. Kh. Shlyk, L. A. Zemskova
{"title":"Capabilities of an Instrumental Neutron-Activation Analysis for Determination of Scandium and Its Controlled Extraction from CHPP Ash Dumps","authors":"S. I. Ivannikov,&nbsp;N. S. Markin,&nbsp;N. V. Polyakova,&nbsp;Yu. I. Shashina,&nbsp;D. Kh. Shlyk,&nbsp;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}
引用次数: 0
Static Sorption of Petroleum Products by a Sorbent Made from Ash-and-Slag Waste of the Thermal Power Industry 火力发电工业灰渣废料制成的吸附剂对石油产品的静态吸附作用
IF 0.7 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2024-12-16 DOI: 10.1134/S004057952470060X
T. G. Korotkova, S. A. Bushumov
{"title":"Static Sorption of Petroleum Products by a Sorbent Made from Ash-and-Slag Waste of the Thermal Power Industry","authors":"T. G. Korotkova,&nbsp;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}
引用次数: 0
Chemical and Mineral Composition of Dolerite of the Dergamysh Deposit 德尔加米什矿藏辉绿岩的化学和矿物成分
IF 0.7 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2024-12-16 DOI: 10.1134/S0040579524700398
E. N. Pechenkina, V. A. Krenev, S. V. Fomichev, E. I. Berbekova, D. F. Kondakov
{"title":"Chemical and Mineral Composition of Dolerite of the Dergamysh Deposit","authors":"E. N. Pechenkina,&nbsp;V. A. Krenev,&nbsp;S. V. Fomichev,&nbsp;E. I. Berbekova,&nbsp;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}
引用次数: 0
New Hybrid Coatings for Controlling the Degradation Rate of MA8 Magnesium Alloy 用于控制 MA8 镁合金降解率的新型混合涂层
IF 0.7 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2024-12-16 DOI: 10.1134/S004057952470043X
A. S. Gnedenkov, S. L. Sinebryukhov, V. S. Filonina, S. V. Gnedenkov
{"title":"New Hybrid Coatings for Controlling the Degradation Rate of MA8 Magnesium Alloy","authors":"A. S. Gnedenkov,&nbsp;S. L. Sinebryukhov,&nbsp;V. S. Filonina,&nbsp;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}
引用次数: 0
Efficiency of Using Heat Pumps in the Extractive Rectification of an Allyl Alcohol–Allyl Acetate Mixture Depending on the Composition of the Feed. Part 2. Application of Heat Pumps in Column Complexes with Partially Coupled Heat and Material Flows 在烯丙基醇-醋酸烯丙基酯混合物的萃取精馏中使用热泵的效率取决于进料的成分。第 2 部分.热泵在具有部分耦合热流和物料流的色谱柱中的应用
IF 0.7 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2024-12-16 DOI: 10.1134/S0040579524700337
D. G. Rudakov, P. S. Klauzner, D. A. Ramochnikov, E. A. Anokhina, A. V. Timoshenko
{"title":"Efficiency of Using Heat Pumps in the Extractive Rectification of an Allyl Alcohol–Allyl Acetate Mixture Depending on the Composition of the Feed. Part 2. Application of Heat Pumps in Column Complexes with Partially Coupled Heat and Material Flows","authors":"D. G. Rudakov,&nbsp;P. S. Klauzner,&nbsp;D. A. Ramochnikov,&nbsp;E. A. Anokhina,&nbsp;A. V. Timoshenko","doi":"10.1134/S0040579524700337","DOIUrl":"10.1134/S0040579524700337","url":null,"abstract":"<div><p>The efficiency of using heat pumps in extractive rectification schemes with partially coupled heat and material flows is studied on the example of separating an allylic alcohol–allyl acetate mixture of various initial compositions with n-butylpropionate as a separating agent. A comparison of schemes with heat pumps and schemes with a traditional two-column scheme of extractive rectification is carried out according to the criteria of reduced energy costs and total annual costs. It is established that with increasing concentration of allylic alcohol in the feed, the energy and economic efficiency of the scheme with a heat pump on the main column of the complex with partially coupled heat and material flows increases. The energy efficiency of the side-section heat-pump circuit decreases with increasing allylic alcohol content in the feed, and the economic efficiency of this circuit increases slightly. The energy efficiency of the scheme in which heat pumps are simultaneously used on the main column and on the side section depends little on the composition of the feed, while the economic efficiency of this scheme increases with increasing concentration of allylic alcohol. For all considered power compositions, the maximum savings in energy costs (by 45.9–49.1%) compared to the traditional two-column scheme is provided by the schemes in which heat pumps are simultaneously used on the main column and on the side section, and the maximum reduction in total annual costs (by 11.7–27.9% with a service life of 20 years) is achieved with the scheme with a heat pump on the main column of the complex with partially coupled heat and material flows.</p></div>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 1","pages":"192 - 201"},"PeriodicalIF":0.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826245","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
Humate Agents based on Oxidized Brown Coal in the Flotation Enrichment of Impregnated Copper–Nickel Ores 基于氧化褐煤的腐殖酸剂在浸渍铜镍矿浮选富集中的应用
IF 0.7 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2024-12-16 DOI: 10.1134/S0040579524700258
S. M. Markosyan, S. A. Antsiferova, N. F. Usmanova, O. N. Suvorova
{"title":"Humate Agents based on Oxidized Brown Coal in the Flotation Enrichment of Impregnated Copper–Nickel Ores","authors":"S. M. Markosyan,&nbsp;S. A. Antsiferova,&nbsp;N. F. Usmanova,&nbsp;O. N. Suvorova","doi":"10.1134/S0040579524700258","DOIUrl":"10.1134/S0040579524700258","url":null,"abstract":"<div><p><b>Abstract</b>—The flotation of impregnated copper-nickel ores is studied using humate agents as depressors, which are obtained from oxidized brown coal by extraction with alkaline reagents. The effect of the humate agents on the flotation of some iron-bearing minerals (pyrite, pyrrhotine, chalcopyrite) among the sulfide ores, as well as the sorption of humates with minerals, are studied. The humate agents are found to have a depressing effect on both nonmetallic minerals and sulfides.</p></div>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 1","pages":"137 - 143"},"PeriodicalIF":0.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826247","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
Decomposition of a Lean Yttrofluorite Concentrate by the Method of Sorption Conversion 用吸附转化法分解贫钇萤石精矿
IF 0.7 4区 工程技术
Theoretical Foundations of Chemical Engineering Pub Date : 2024-12-16 DOI: 10.1134/S0040579524700660
E. P. Lokshin, O. A. Tareeva, S. V. Drogobuzhskaya
{"title":"Decomposition of a Lean Yttrofluorite Concentrate by the Method of Sorption Conversion","authors":"E. P. Lokshin,&nbsp;O. A. Tareeva,&nbsp;S. V. Drogobuzhskaya","doi":"10.1134/S0040579524700660","DOIUrl":"10.1134/S0040579524700660","url":null,"abstract":"<div><p>The behavior of rare-earth elements and major impurities during the nitric-acid decomposition of a lean yttrofluorite concentrate by the method of sorption conversion is studied. The decomposition conditions providing satisfactory extraction into the sorbent for rare-earth elements, especially yttrium and yttrium group lanthanides, are determined.</p></div>","PeriodicalId":798,"journal":{"name":"Theoretical Foundations of Chemical Engineering","volume":"58 2","pages":"403 - 408"},"PeriodicalIF":0.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142826053","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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