Pub Date : 2024-03-04DOI: 10.29235/1561-8331-2024-60-1-7-17
T. A. Poсhodina, N. Kulinich, V. V. Komar, O. Y. Smirnova, N. Krutko
The corrosion resistance of coatings (thickness 70 µm) based on epoxy powder paints modified with aliphatic amine or a mixture of anticorrosive pigments to the action of sodium chloride solution and salt spray has been studied. It is showed that with the increase of molecuar weight of initial epoxy oligomer and also at the incorporation of chemisorbing alifatic amine, containing polar groups, to the decrease in the permeability of the sodium chloride solution into the coating material is observed. It has been established that the observed changes in the properties of the coatings are due to the formation of a spatial structure of the polymer with different cross-link frequencies. It is shown that the introduction of a mixture of anti-corrosion pigments into the composition of paints provides a significant increase in the protective properties of coatings and a high preservation of the physical and mechanical properties of coatings in comparison with the base compositions. For 9000 hours of testing in a sodium chloride solution, the strength characteristics of the coatings decrease by about 10–12 % from the original ones. Based on the results of tests of coatings to the action of salt spray, the possibility of using the developed epoxy powder paints for operation in environments of a high atmospheric-corrosive category – C 5–1, including the application of coatings directly on a metal surface (Direct to metal) without multi-stage preparation of the metal surface for painting, is shown.
研究了以脂肪族胺或防腐颜料混合物改性的环氧粉末涂料为基础的涂层（厚度为 70 微米）在氯化钠溶液和盐雾作用下的耐腐蚀性。研究表明，随着初始环氧低聚物分子量的增加，以及含有极性基团的化学吸附性脂肪族胺的加入，氯化钠溶液对涂层材料的渗透性降低。研究发现，涂层性能的变化是由于聚合物形成了具有不同交联频率的空间结构。研究表明，在涂料成分中引入防腐颜料混合物后，与基础成分相比，涂料的保护性能显著提高，物理和机械性能也得到了很好的保持。在氯化钠溶液中测试 9000 小时后，涂料的强度特性比原来降低了约 10-12%。根据涂层在盐雾作用下的测试结果，可以看出所开发的环氧粉末涂料可以在大气腐蚀性较强的 C 5-1 类环境中使用，包括直接在金属表面涂装（直接涂装到金属），而无需对金属表面进行多道工序的涂装准备。
{"title":"Anti-corrosion resistance of coatings based on powder epoxy paints containing modifiers","authors":"T. A. Poсhodina, N. Kulinich, V. V. Komar, O. Y. Smirnova, N. Krutko","doi":"10.29235/1561-8331-2024-60-1-7-17","DOIUrl":"https://doi.org/10.29235/1561-8331-2024-60-1-7-17","url":null,"abstract":"The corrosion resistance of coatings (thickness 70 µm) based on epoxy powder paints modified with aliphatic amine or a mixture of anticorrosive pigments to the action of sodium chloride solution and salt spray has been studied. It is showed that with the increase of molecuar weight of initial epoxy oligomer and also at the incorporation of chemisorbing alifatic amine, containing polar groups, to the decrease in the permeability of the sodium chloride solution into the coating material is observed. It has been established that the observed changes in the properties of the coatings are due to the formation of a spatial structure of the polymer with different cross-link frequencies. It is shown that the introduction of a mixture of anti-corrosion pigments into the composition of paints provides a significant increase in the protective properties of coatings and a high preservation of the physical and mechanical properties of coatings in comparison with the base compositions. For 9000 hours of testing in a sodium chloride solution, the strength characteristics of the coatings decrease by about 10–12 % from the original ones. Based on the results of tests of coatings to the action of salt spray, the possibility of using the developed epoxy powder paints for operation in environments of a high atmospheric-corrosive category – C 5–1, including the application of coatings directly on a metal surface (Direct to metal) without multi-stage preparation of the metal surface for painting, is shown.","PeriodicalId":20798,"journal":{"name":"Proceedings of the National Academy of Sciences of Belarus, Chemical Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140266697","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 : 2024-03-04DOI: 10.29235/1561-8331-2024-60-1-27-35
E. Dikusar, E. A. Akishina, S. Stepin, L. N. Filippovich, N. V. Bogdanova, S. N. Shahab, V. Potkin
Acylation of substituted hydroxybenzaldehydes with hydrochloride of atophane acylchloride in dichloromethane in the presence of triethylamine gave esters, capable of forming (E)-azomethines when condensed with amines (4-aminoazobenzene, 4-aminoantipyrine) in methanol. In addition, an ester of atophane with a natural fragment of curcumin was obtained. Films based on (E)-azomethine with an azobenzene fragment were found to have a high polarizing ability.
{"title":"Novel derivatives of atophan (2-phenylquinoline-4-carboxic acid)","authors":"E. Dikusar, E. A. Akishina, S. Stepin, L. N. Filippovich, N. V. Bogdanova, S. N. Shahab, V. Potkin","doi":"10.29235/1561-8331-2024-60-1-27-35","DOIUrl":"https://doi.org/10.29235/1561-8331-2024-60-1-27-35","url":null,"abstract":"Acylation of substituted hydroxybenzaldehydes with hydrochloride of atophane acylchloride in dichloromethane in the presence of triethylamine gave esters, capable of forming (E)-azomethines when condensed with amines (4-aminoazobenzene, 4-aminoantipyrine) in methanol. In addition, an ester of atophane with a natural fragment of curcumin was obtained. Films based on (E)-azomethine with an azobenzene fragment were found to have a high polarizing ability.","PeriodicalId":20798,"journal":{"name":"Proceedings of the National Academy of Sciences of Belarus, Chemical Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140080023","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 : 2024-03-04DOI: 10.29235/1561-8331-2024-60-1-36-44
Y. Lamekina, T. Seviarynchyk, E. Ulashchik, T. P. Akhlamionok, P. Y. Baryshchyk, B. Ranishenka, V. V. Shmanai
In this work, a new phosphoramidite reagent for the preparation of thiol-modified oligonucleotides was synthesized. Thiol-specific reagents have been used to demonstrate the reactivity of thiol groups. After modification, conjugates were purified via gel-filtration and characterized with HPLC-MS.
{"title":"Synthesis of thiol-containing DNA-oligonucleotides using a phosphoramidite reagent based on trans -4-hydroxy-L-prolinol","authors":"Y. Lamekina, T. Seviarynchyk, E. Ulashchik, T. P. Akhlamionok, P. Y. Baryshchyk, B. Ranishenka, V. V. Shmanai","doi":"10.29235/1561-8331-2024-60-1-36-44","DOIUrl":"https://doi.org/10.29235/1561-8331-2024-60-1-36-44","url":null,"abstract":"In this work, a new phosphoramidite reagent for the preparation of thiol-modified oligonucleotides was synthesized. Thiol-specific reagents have been used to demonstrate the reactivity of thiol groups. After modification, conjugates were purified via gel-filtration and characterized with HPLC-MS.","PeriodicalId":20798,"journal":{"name":"Proceedings of the National Academy of Sciences of Belarus, Chemical Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140080411","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 : 2024-03-04DOI: 10.29235/1561-8331-2024-60-1-81-88
D. V. Sapsaliou, G. Melnikova, A. V. Aksiuchyts, T. Tolstaya, D. A. Kotov, S. Chizhik
The results of using poly(methyl methacrylate) coatings for the development of the capacitive sensors for analyzing the content of heavy metals in water (using Ni2+ ions as example) are presented. Structural and morphological characteristics of the formed conductive nickel layer and nanostructured poly(methyl methacrylate) films were studied by atomic force microscopy. Based on the analysis of the dependence of the capacitive characteristics of the original sensor on the frequency at different concentrations of Ni2+ ions, the following operating characteristics of the sensor were established: response time – 5 min; operating range of Ni2+ ion concentrations: 1 ‧ 10–3–50 mM; lower detection limit ≈ 0,06 mg/l. It is shown that the formation of a poly(methyl methacrylate) coating on a conductive nickel layer by the spin coating method increases the service life of the sensor to eight cycles while maintaining the level of sensor sensitivity.
{"title":"Sensory layers of poly(methyl metacrylate) for capacitive sensors for analysis of the content of heavy metal cations in water","authors":"D. V. Sapsaliou, G. Melnikova, A. V. Aksiuchyts, T. Tolstaya, D. A. Kotov, S. Chizhik","doi":"10.29235/1561-8331-2024-60-1-81-88","DOIUrl":"https://doi.org/10.29235/1561-8331-2024-60-1-81-88","url":null,"abstract":"The results of using poly(methyl methacrylate) coatings for the development of the capacitive sensors for analyzing the content of heavy metals in water (using Ni2+ ions as example) are presented. Structural and morphological characteristics of the formed conductive nickel layer and nanostructured poly(methyl methacrylate) films were studied by atomic force microscopy. Based on the analysis of the dependence of the capacitive characteristics of the original sensor on the frequency at different concentrations of Ni2+ ions, the following operating characteristics of the sensor were established: response time – 5 min; operating range of Ni2+ ion concentrations: 1 ‧ 10–3–50 mM; lower detection limit ≈ 0,06 mg/l. It is shown that the formation of a poly(methyl methacrylate) coating on a conductive nickel layer by the spin coating method increases the service life of the sensor to eight cycles while maintaining the level of sensor sensitivity.","PeriodicalId":20798,"journal":{"name":"Proceedings of the National Academy of Sciences of Belarus, Chemical Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140267063","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 : 2024-03-04DOI: 10.29235/1561-8331-2024-60-1-53-62
O. Dormeshkin, A. N. Hauryliuk, M. S. Mokhart, A. A. Byshyk
The results of studies of rheological properties of ammonized suspensions in the NH4+–PO43—SO42-–H2O system in the temperature range of 80–95 °С and the NH3 : H3PO4 mole ratio from 0.6 to 1.6 are presented. The results of the studies made it possible to establish that differences in the content of sulfate and phosphate ions in the NH4+–PO43—SO42-–H2O system lead to a significant change in the solubility and position of the crystallization fields and, as a result, to a change in viscosity. To ensure the necessary mobility of the suspension after the first neutralization step, an optimal H3PO4 : H2SO4 mole ratio interval must be maintained for each fertilizer grade. Maximum viscosity values are characteristic of fertilizers, for which this ratio is close to the equimolar and decreases as it increases. It has been found that each grades and molar ratio of NH3 : H3PO4 correspond to a certain range of excess moisture values, which can be removed while maintaining sufficient mobility of the system. The highest rates in terms of the possible amount of moisture removed are brands with a lower ratio of N : P2O5. With an increase in the degree of ammonization, there is an increase in viscosity and a sharp decrease in excess moisture, which can be removed for all tested grands. The obtained results will be used in the development of new technology for obtaining complex fertilizers such as sulfoammophos and NPK fertilizers based on staged ammonization of acids.
{"title":"Investigation of rheological properties of ammonized suspensions in the NH4+–PO43-–SO42-–H2O system","authors":"O. Dormeshkin, A. N. Hauryliuk, M. S. Mokhart, A. A. Byshyk","doi":"10.29235/1561-8331-2024-60-1-53-62","DOIUrl":"https://doi.org/10.29235/1561-8331-2024-60-1-53-62","url":null,"abstract":"The results of studies of rheological properties of ammonized suspensions in the NH4+–PO43—SO42-–H2O system in the temperature range of 80–95 °С and the NH3 : H3PO4 mole ratio from 0.6 to 1.6 are presented. The results of the studies made it possible to establish that differences in the content of sulfate and phosphate ions in the NH4+–PO43—SO42-–H2O system lead to a significant change in the solubility and position of the crystallization fields and, as a result, to a change in viscosity. To ensure the necessary mobility of the suspension after the first neutralization step, an optimal H3PO4 : H2SO4 mole ratio interval must be maintained for each fertilizer grade. Maximum viscosity values are characteristic of fertilizers, for which this ratio is close to the equimolar and decreases as it increases. It has been found that each grades and molar ratio of NH3 : H3PO4 correspond to a certain range of excess moisture values, which can be removed while maintaining sufficient mobility of the system. The highest rates in terms of the possible amount of moisture removed are brands with a lower ratio of N : P2O5. With an increase in the degree of ammonization, there is an increase in viscosity and a sharp decrease in excess moisture, which can be removed for all tested grands. The obtained results will be used in the development of new technology for obtaining complex fertilizers such as sulfoammophos and NPK fertilizers based on staged ammonization of acids.","PeriodicalId":20798,"journal":{"name":"Proceedings of the National Academy of Sciences of Belarus, Chemical Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140080520","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 : 2024-03-04DOI: 10.29235/1561-8331-2023-60-1-18-26
V. Zhylko, N. Nekhan
In this work we propose to use a heptane-ethanol extract of the ionic associate of higher carboxylic acids with a cationic dye – pyronin G (Y) for quantitative extraction-photometric and extraction-fluorimetric determination of carboxylic acids in dairy products. The resulting ion associate is characterized by a maximum of optical density at 510 nm and intense of fluorescence with a maximum at 566 nm. The maximum optical density and fluorescence intensity of the ion associate is observed during its extraction with octanol/heptane from aqueous solutions with pH = 11.25. The quantum yield of ionic associates of higher carboxylic acids with pyronine G (Y) relative to the standard solution of fluorescein was calculated. A technique has been developed for the extraction-fluorimetric determination of hydrophobic acids in milk and cheese. The method has been tested in the determination of carboxylic acids content in milk and cheese samples. The content of higher carboxylic acids, determined by the method with pyronin G, in milk was (6.6 ± 0.15) · 10–4 M, in cheese – (1.1 ± 0.10) · 10–3 mol/kg. The obtained results of extraction-photometric and extraction-fluorimetric determination of carboxylic acids in dairy products make it possible to recommend the developed method in the practice of institutions of the corresponding profile.
{"title":"Application of cationic dye pyronin G (Y) for quantitative photometric and fluorimetric determination of higher carboxylic acids in dairy products using extraction","authors":"V. Zhylko, N. Nekhan","doi":"10.29235/1561-8331-2023-60-1-18-26","DOIUrl":"https://doi.org/10.29235/1561-8331-2023-60-1-18-26","url":null,"abstract":"In this work we propose to use a heptane-ethanol extract of the ionic associate of higher carboxylic acids with a cationic dye – pyronin G (Y) for quantitative extraction-photometric and extraction-fluorimetric determination of carboxylic acids in dairy products. The resulting ion associate is characterized by a maximum of optical density at 510 nm and intense of fluorescence with a maximum at 566 nm. The maximum optical density and fluorescence intensity of the ion associate is observed during its extraction with octanol/heptane from aqueous solutions with pH = 11.25. The quantum yield of ionic associates of higher carboxylic acids with pyronine G (Y) relative to the standard solution of fluorescein was calculated. A technique has been developed for the extraction-fluorimetric determination of hydrophobic acids in milk and cheese. The method has been tested in the determination of carboxylic acids content in milk and cheese samples. The content of higher carboxylic acids, determined by the method with pyronin G, in milk was (6.6 ± 0.15) · 10–4 M, in cheese – (1.1 ± 0.10) · 10–3 mol/kg. The obtained results of extraction-photometric and extraction-fluorimetric determination of carboxylic acids in dairy products make it possible to recommend the developed method in the practice of institutions of the corresponding profile.","PeriodicalId":20798,"journal":{"name":"Proceedings of the National Academy of Sciences of Belarus, Chemical Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140266640","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 : 2024-03-04DOI: 10.29235/1561-8331-2024-60-1-45-52
A. Boymirzaev, G. E. Berdimbetova, B. P. Karlybaeva
The article deals with the synthesis of water-soluble derivatives of chitin and chitosan from cysts of crustaceans of the genus Artemia Parthenogenetica of the Aral Sea by carboxymethylation of OH and NH2 groups of their chains. The elution, viscosity and polyelectrolyte properties in size exclusion liquid chromatography of carboxymethylchitin and carboxymethylchitosan were studied. The suppression of electrostatic effects and the implementation of the exclusion mechanism for the separation of these polysaccharides were achieved by using an aqueous solution of sodium nitrate with a concentration of 0.1 mol/l as an eluent, which was recommended for determining molecular weight characteristics.
{"title":"Exclusion liquid chromatography of carboxymethylchitin and carboxymethylchitosan from crustacean Artemia Parthenogenetica of the Aral Sea","authors":"A. Boymirzaev, G. E. Berdimbetova, B. P. Karlybaeva","doi":"10.29235/1561-8331-2024-60-1-45-52","DOIUrl":"https://doi.org/10.29235/1561-8331-2024-60-1-45-52","url":null,"abstract":"The article deals with the synthesis of water-soluble derivatives of chitin and chitosan from cysts of crustaceans of the genus Artemia Parthenogenetica of the Aral Sea by carboxymethylation of OH and NH2 groups of their chains. The elution, viscosity and polyelectrolyte properties in size exclusion liquid chromatography of carboxymethylchitin and carboxymethylchitosan were studied. The suppression of electrostatic effects and the implementation of the exclusion mechanism for the separation of these polysaccharides were achieved by using an aqueous solution of sodium nitrate with a concentration of 0.1 mol/l as an eluent, which was recommended for determining molecular weight characteristics.","PeriodicalId":20798,"journal":{"name":"Proceedings of the National Academy of Sciences of Belarus, Chemical Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140079888","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 : 2024-03-04DOI: 10.29235/1561-8331-2024-60-1-63-72
O. V. Luksha, N. Belous, S. P. Rodtsevich, V. M. Chernetskaya
The results of studying the chemical and phase composition of oil and fat production wastes - used filtering and bleaching powders are presented. It has been established that the crystalline phase of the powders is represented mainly by silicon dioxide, as well as aluminum, iron and titanium oxides, sodium and potassium aluminosilicates. The organic part of the spent filtering powders consists of waxes, while the bleaching powder phase contains fats and free fatty acids with unsaturated bonds. The concentration of water-soluble organic compounds in filtering powders does not exceed 30 mg/dm3, and in spent bleaching powder reaches 700–900 mg/dm3, which explains the decrease in surface tension at the solution-air interface in its presence and contributes to an increase in the effectiveness of its hydrophobic action in Portland cement systems. Analysis of the results of the study of the hardening process, strength, hydrophysical and corrosion properties of fine-grained Portland cement concretes confirmed the maximum effect of increasing the draft of the cone and mobility, due to the air entrainment of Portland cement mortars and their saturation with air microbubbles when bleaching powder is introduced. At the same time, in the presence of spent filtering powders, additional air entrainment, and, consequently, plasticization, is not observed. As a result of the formation of a protective layer in Portland cement concrete, there is difficulty in the access of water molecules to the solid phase, which leads to a significant improvement in hydrophysical properties. There is a decrease in water absorption by 45–54 %, salt absorption – by an average of 55 %, as a result, an increase in the coefficient of salt resistance of materials is recorded. The maximum effect of reducing salt corrosion and increasing the salt resistance coefficient of materials is due to the peculiarities of the capillary-porous structure of concrete in the presence of bleaching powder, the kinetics of diffusion of salt solutions in them, and the decrease in capillary suction and crystallization pressure of salts in the pores of the material.
{"title":"Hydro-phobization of fine-grained portland cement concrete with spent filtering and bleaching powders","authors":"O. V. Luksha, N. Belous, S. P. Rodtsevich, V. M. Chernetskaya","doi":"10.29235/1561-8331-2024-60-1-63-72","DOIUrl":"https://doi.org/10.29235/1561-8331-2024-60-1-63-72","url":null,"abstract":"The results of studying the chemical and phase composition of oil and fat production wastes - used filtering and bleaching powders are presented. It has been established that the crystalline phase of the powders is represented mainly by silicon dioxide, as well as aluminum, iron and titanium oxides, sodium and potassium aluminosilicates. The organic part of the spent filtering powders consists of waxes, while the bleaching powder phase contains fats and free fatty acids with unsaturated bonds. The concentration of water-soluble organic compounds in filtering powders does not exceed 30 mg/dm3, and in spent bleaching powder reaches 700–900 mg/dm3, which explains the decrease in surface tension at the solution-air interface in its presence and contributes to an increase in the effectiveness of its hydrophobic action in Portland cement systems. Analysis of the results of the study of the hardening process, strength, hydrophysical and corrosion properties of fine-grained Portland cement concretes confirmed the maximum effect of increasing the draft of the cone and mobility, due to the air entrainment of Portland cement mortars and their saturation with air microbubbles when bleaching powder is introduced. At the same time, in the presence of spent filtering powders, additional air entrainment, and, consequently, plasticization, is not observed. As a result of the formation of a protective layer in Portland cement concrete, there is difficulty in the access of water molecules to the solid phase, which leads to a significant improvement in hydrophysical properties. There is a decrease in water absorption by 45–54 %, salt absorption – by an average of 55 %, as a result, an increase in the coefficient of salt resistance of materials is recorded. The maximum effect of reducing salt corrosion and increasing the salt resistance coefficient of materials is due to the peculiarities of the capillary-porous structure of concrete in the presence of bleaching powder, the kinetics of diffusion of salt solutions in them, and the decrease in capillary suction and crystallization pressure of salts in the pores of the material.","PeriodicalId":20798,"journal":{"name":"Proceedings of the National Academy of Sciences of Belarus, Chemical Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140080826","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 : 2024-03-04DOI: 10.29235/1561-8331-2024-60-1-73-80
R. Popov, E. О. Bogdan, O. A. Sergievich, E. Dyatlova
The results of a study the influence of magnesium oxide substitution with zinc oxide in the Li2O–MgO– Al2O3–SiO2 system, as well as the introduction of pre-synthesized ganite ZnAl2O4, on sintering, phase formation and thermal expansion of synthesized materials are presented. It was found that after substitution of 4 % magnesium oxide MgO with zinc oxide ZnO, the ceramic material synthesized at a temperature of 1 150 °C was characterized by higher values of apparent density (not less than 1 835 kg/m3), mechanical compressive strength (300 MPa), and heat resistance (more than 80 thermal cycles), as well as low values of LTEC (–0,25 ∙ 10–6 K–1), which is due to the formation of crystalline phases of spodumene, spinel, forsterite, corundum, ganite and quartz.
{"title":"Influence of zinc-containing compounds on the properties of ceramic materials based on the Li2O–MgO–Al2O3–SiO2 system","authors":"R. Popov, E. О. Bogdan, O. A. Sergievich, E. Dyatlova","doi":"10.29235/1561-8331-2024-60-1-73-80","DOIUrl":"https://doi.org/10.29235/1561-8331-2024-60-1-73-80","url":null,"abstract":"The results of a study the influence of magnesium oxide substitution with zinc oxide in the Li2O–MgO– Al2O3–SiO2 system, as well as the introduction of pre-synthesized ganite ZnAl2O4, on sintering, phase formation and thermal expansion of synthesized materials are presented. It was found that after substitution of 4 % magnesium oxide MgO with zinc oxide ZnO, the ceramic material synthesized at a temperature of 1 150 °C was characterized by higher values of apparent density (not less than 1 835 kg/m3), mechanical compressive strength (300 MPa), and heat resistance (more than 80 thermal cycles), as well as low values of LTEC (–0,25 ∙ 10–6 K–1), which is due to the formation of crystalline phases of spodumene, spinel, forsterite, corundum, ganite and quartz.","PeriodicalId":20798,"journal":{"name":"Proceedings of the National Academy of Sciences of Belarus, Chemical Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140265669","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 : 2023-12-02DOI: 10.29235/1561-8331-2023-59-4-334-340
M. A. Samadiy, B. U. Abdullaev, I. I. Usmanov
The results of studying the composition and rheological properties of solutions after separation of glaserite, as well as the influence of technological parameters on the process of evaporation of mother liquors in the production of potassium sulfate by conversion of flotation potassium chloride with mirabilite of the Tumryuk deposit, are presented. The evaporation process proceeds most intensively at 120 °C. In this case, after 60 minutes, the volume of the evaporated solution is reduced by 50 %. An increase in the volume of evaporated moisture from 20 to 40 % contributes to an increase in the sludge yield from 11.8 to 22.9 %. The density of solutions increases with an increase in the volume of evaporated liquid, and the viscosity slightly decreases. During evaporation, the density increases from 1.298 g/cm3 when 20 % moisture is removed to 1.358 g/cm3 when 40 % moisture is evaporated at a temperature of 20 °C. In this case, the viscosity decreases from 2.072 to 2.007 mPa·s. It is shown that at a ratio of glaserite sodium sulfate to potassium chloride equal to 1 : 1, a temperature of 30 °C and process duration of 40 minutes, the degree of conversion reaches 86.65 % in terms of potassium.
{"title":"Technology for the production of potassium sulphate from mirabilite and potassium chloride of the Tyubegatan deposit","authors":"M. A. Samadiy, B. U. Abdullaev, I. I. Usmanov","doi":"10.29235/1561-8331-2023-59-4-334-340","DOIUrl":"https://doi.org/10.29235/1561-8331-2023-59-4-334-340","url":null,"abstract":"The results of studying the composition and rheological properties of solutions after separation of glaserite, as well as the influence of technological parameters on the process of evaporation of mother liquors in the production of potassium sulfate by conversion of flotation potassium chloride with mirabilite of the Tumryuk deposit, are presented. The evaporation process proceeds most intensively at 120 °C. In this case, after 60 minutes, the volume of the evaporated solution is reduced by 50 %. An increase in the volume of evaporated moisture from 20 to 40 % contributes to an increase in the sludge yield from 11.8 to 22.9 %. The density of solutions increases with an increase in the volume of evaporated liquid, and the viscosity slightly decreases. During evaporation, the density increases from 1.298 g/cm3 when 20 % moisture is removed to 1.358 g/cm3 when 40 % moisture is evaporated at a temperature of 20 °C. In this case, the viscosity decreases from 2.072 to 2.007 mPa·s. It is shown that at a ratio of glaserite sodium sulfate to potassium chloride equal to 1 : 1, a temperature of 30 °C and process duration of 40 minutes, the degree of conversion reaches 86.65 % in terms of potassium.","PeriodicalId":20798,"journal":{"name":"Proceedings of the National Academy of Sciences of Belarus, Chemical Series","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138607466","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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