Journal of Chemical Technology and Metallurgy最新文献_第7页

DEVELOPMENT OF RECOMMENDATIONS FOR THE IMPLEMENTATION OF COMBINED DEFORMATION TREATMENT “ECAP-DRAWING” INTO PRODUCTION 为在生产中实施组合变形处理 "ecap-drawing "提出建议

Journal of Chemical Technology and Metallurgy Pub Date : 2024-01-03 DOI: 10.59957/jctm.v59.i1.2024.21

I. Volokitina, A. Volokitin, Gulnara Ulyeva, Elisey Khlopkov, Oxana Maldina

引用次数: 0

PROCESS FOR RECOVERING SILICA FROM LITHOMARG CLAY: VALUE ADDITION OF UNEXPLOITEDMINING REJECT 从石质粘土中回收二氧化硅的工艺：未开发矿产的增值回收

Journal of Chemical Technology and Metallurgy Pub Date : 2024-01-03 DOI: 10.59957/jctm.v59.i1.2024.15

M. Najar, Amrita Karn, P. Nageshwar, Pravin Bhukte, Mukesh Chaddha, Anupam Agnihotri

引用次数: 0

METHODS FOR THE SYNTHESIS OF TiO2 NANOPARTICLES. PROPERTIES OF TEXTILE MATERIALS TREATED WITH TiO2 NANOPARTICLES 二氧化钛纳米颗粒的合成方法。用二氧化钛纳米颗粒处理的纺织材料的性能

Journal of Chemical Technology and Metallurgy Pub Date : 2024-01-03 DOI: 10.59957/jctm.v59.i2.2024.7

Margarita Koleva, D. Angelova, D. Zheleva

{"title":"METHODS FOR THE SYNTHESIS OF TiO2 NANOPARTICLES. PROPERTIES OF TEXTILE MATERIALS TREATED WITH TiO2 NANOPARTICLES","authors":"Margarita Koleva, D. Angelova, D. Zheleva","doi":"10.59957/jctm.v59.i2.2024.7","DOIUrl":"https://doi.org/10.59957/jctm.v59.i2.2024.7","url":null,"abstract":"In recent decades, interest in oxide nanomaterials with multifunctional properties has grown significantly. Titanium dioxide undoubtedly belongs to them, characterized by exceptional photocatalytic activity, non-toxicity, high availability, biocompatibility, antibacterial properties, and low cost. The treatment of textile materials with TiO2 nanoparticles is relatively simple, but the insufficient bonding efficiency between certain fibers and TiO 2 nanoparticles creates a problem regarding the stability and durability of the nanocomposites. In this study, an attempt was made to improve the properties of cotton modified with gelatin hydrogel, which was cross-linked by glutaraldehyde, and incorporated titanium nanoparticles. Three modification methods were applied, varying the mixing regimes of the components and the conditions. The composite materials were investigated via SEM, FTIR, UV-Vis and elemental analysis.For the first time, titanium nanoparticles obtained by the reduction of TiO2 with oxalic acid were used to modify cotton. Cotton samples were modified with gelatin hydrogel cross-linked with glutaraldehyde to increase the active groups of cellulose fibers that bind to Ti ions. Using the hydrogel, the nanoparticles are deposited on the surface of the textile substrate. The elemental analysis shows the presence of TiO2 nanoparticles. Lines for Ti atoms appear, which is evidence that the particles retain their composition after immobilization. Microscopic analyzes showed that TiO2 nanoparticles were distributed unevenly in the cotton matrix. In the UV analysis, the appearance of a new absorption at 890 cm-1 was observed due to the attachment of Ti-NPs. The appearance of the IR peak at 878 cm-1 confirms the formation of chelate complexes of the nanoparticles in the composite material.","PeriodicalId":38363,"journal":{"name":"Journal of Chemical Technology and Metallurgy","volume":"226 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140514505","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}

引用次数: 0

THE POTENTIAL FOR CARBON SEQUESTRATION IN RECLAIMED MINE SOIL 复垦矿山土壤固碳的潜力

Journal of Chemical Technology and Metallurgy Pub Date : 2024-01-03 DOI: 10.59957/jctm.v59.i2.2024.20

Ekaterina Serafimova, K. Dedelyanova

{"title":"THE POTENTIAL FOR CARBON SEQUESTRATION IN RECLAIMED MINE SOIL","authors":"Ekaterina Serafimova, K. Dedelyanova","doi":"10.59957/jctm.v59.i2.2024.20","DOIUrl":"https://doi.org/10.59957/jctm.v59.i2.2024.20","url":null,"abstract":"Mining sector has been the central attention of the business and public policy sustainable development scheme for several years. Reclamation territories are with potential carbon sequestration capacity in degraded mining areas and can be an impeccable option for achieving sustainable development goal-13. This paper made an investigation about the presence of heavy metals in reclaimed area possibilities to improve reclaimed soils with biochar with idea to enhance ecosystem carbon pool and atmospheric CO2 sequestration capacity to offset CO2 emission and soil organic carbon losses. The results show that the carbon content in biochar is 46.6 % and would be classified in class 2 according to the International Biochar Initiative. H/C and O/C atomic ratios could be useful for restoration of degraded poor mine soils through enhanced carbon sequestration. O/C ratio is 0.085 mol mol–1 and half-life of biochar is 2795.65 years, which confirm the biochar stability. For each kilogram of biochar incorporated into the soil, 144 g of carbon were sequestrated 52,8 % CO2 emission reduction. Hence, the biochar developed in this study can be used in carbon-deficient soils with the added benefit of long-term carbon storage.","PeriodicalId":38363,"journal":{"name":"Journal of Chemical Technology and Metallurgy","volume":"277 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140514378","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}

引用次数: 0

SYNTHESIS AND PROPERTIES OF NdMeIITeO4.5 (MeII – Ca,Ba) TELLURITES NdMeIITeO4.5 (MeII - Ca,Ba) TELLURITES 的合成与性质

Journal of Chemical Technology and Metallurgy Pub Date : 2024-01-03 DOI: 10.59957/jctm.v59.i1.2024.18

Kenzhebek Rustembekov, A. Toibek, Mitko Stoev, Gulim Mukusheva, Timur Sadykov

{"title":"SYNTHESIS AND PROPERTIES OF NdMeIITeO4.5 (MeII – Ca,Ba) TELLURITES","authors":"Kenzhebek Rustembekov, A. Toibek, Mitko Stoev, Gulim Mukusheva, Timur Sadykov","doi":"10.59957/jctm.v59.i1.2024.18","DOIUrl":"https://doi.org/10.59957/jctm.v59.i1.2024.18","url":null,"abstract":"The aim of this work was to synthesize and investigate the roentgenographic and electro-physical properties of new phases, namely double tellurites of neodymium. Oxotellurites of the composition NdMeIITeO4.5(MeII - Ca, Ba) were synthesized by the method of ceramic technology with high-temperature interaction of Nd2O3, TeO2 oxides with carbonates of alkaline earth metals in the interval of 800°С - 1200°С. Roentgenograms of the synthesized compounds were obtained using an Empyrean powder diffractometer by PANalytical and indication was determined using the X’Pert HighScore Plus program. It was found that the synthesized tellurites were crystallized in tetragonal syngony. The unit cell parameters, roentgen and pycnometric densities of the compounds were determined. It was revealed that with increasing ionic radii from Ca to Ba, the lattice parameters and unit cell volumes of synthesized tellurites increase. The assumed structure of the synthesized double tellurites of neodymium is a distorted perovskite structure. A study of the temperature dependence of the dielectric permittivity and electrical resistance of tellurites of neodymium-alkaline earth metals established that they can possess semiconducting properties at 293 K - 483 K. Temperature coefficients of resistance and forbidden zone width of tellurites were calculated.","PeriodicalId":38363,"journal":{"name":"Journal of Chemical Technology and Metallurgy","volume":"13 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139451276","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}

引用次数: 0

CONDITION BASED ASSESSMENT FOR PREDICTIVE MAINTENANCE OF METALLURGICAL EQUIPMENT 基于状态的冶金设备预测性维护评估

Journal of Chemical Technology and Metallurgy Pub Date : 2024-01-03 DOI: 10.59957/jctm.v59.i2.2024.23

Emil Mihailov, Ivanka Petrova, Monika Asenova

{"title":"CONDITION BASED ASSESSMENT FOR PREDICTIVE MAINTENANCE OF METALLURGICAL EQUIPMENT","authors":"Emil Mihailov, Ivanka Petrova, Monika Asenova","doi":"10.59957/jctm.v59.i2.2024.23","DOIUrl":"https://doi.org/10.59957/jctm.v59.i2.2024.23","url":null,"abstract":"The continuous nature of metallurgical technologies and the intensification of production increase the risk of damage to high-temperature equipment during the technological process. The destruction of the structural integrity of the refractory insulation of this equipment leads to the forced interruption of production and significant costs of emergency response and require measures to be taken to reduce the risk of such situations. An opportunity to solve these problems in the metallurgical industry is the introduction into the production process of sustainable systems for making informed decisions and predictive maintenance of equipment, based on continuous or periodic monitoring of the condition of refractory insulation of high-temperature furnaces and auxiliary equipment. \u0000Predictive maintenance of technological equipment and aggregates, based on an assessment of their current condition, extends their life, reduces downtime, maintains the optimal level of production, and guarantees compliance with the exact delivery time of production (raw materials, materials, energy). A procedure is presented for assessing the real condition of steel ladles based on periodic monitoring results as part of a decision-making system for predictive and safe use of their maximum resource.","PeriodicalId":38363,"journal":{"name":"Journal of Chemical Technology and Metallurgy","volume":"159 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140514632","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}

引用次数: 0

OBTAINING Na2SO4 FROM SODA SMELTING SLAG FROM THE RECYCLING OF LEAD ACID BATTERIES 从回收酸铅蓄电池的苏打溶渣中获取 Na2SO4

Journal of Chemical Technology and Metallurgy Pub Date : 2024-01-03 DOI: 10.59957/jctm.v59.i2.2024.10

B. Lucheva, P. Iliev, Nadezda Kazakova, Miroslav Iliev

{"title":"OBTAINING Na2SO4 FROM SODA SMELTING SLAG FROM THE RECYCLING OF LEAD ACID BATTERIES","authors":"B. Lucheva, P. Iliev, Nadezda Kazakova, Miroslav Iliev","doi":"10.59957/jctm.v59.i2.2024.10","DOIUrl":"https://doi.org/10.59957/jctm.v59.i2.2024.10","url":null,"abstract":"Soda smelting slag is generated during the processing of desulphurized paste from recycling of waste lead acid batteries and other lead containing secondary materials in tilting rotary furnaces, and it represents about 9.5 % of the mass of the charge entering the furnace. This type of slag is very reactive. It contains toxic substances (lead, arsenic and antimony) and because of the presence of alkaline compounds it is corrosive. In addition, it decomposes in contact with air, forming dust. Therefore, such hazardous product cannot be disposed without preliminary stabilization. \u0000The aim of the present work is to investigate the possibility for environmentally utilization of this slag. The conducted experiments have shown the possibility of extracting the sodium sulfate from the soda slag only by grinding in an aqueous medium with subsequent filtration. The resulting solution is subjected to sulfide purification from heavy non-ferrous metals and subsequent crystallization for obtaining a commercial product sodium sulfate. These processes could be easily implemented in companies that have applied Engitec’s technology for recycling spent lead-acid batteries and production of sodium sulfate from desulfurization of the lead paste. Implementation of these processes will eliminate the need for slag stabilization and prevent environmental problems.","PeriodicalId":38363,"journal":{"name":"Journal of Chemical Technology and Metallurgy","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140514774","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}

引用次数: 0

SYNTHESIS AND PHYSICO-CHEMICAL STUDY OF Co, Ni, Cu, AND Sn NANOPARTICLES 钴、镍、铜和锡纳米颗粒的合成与物理化学研究

Journal of Chemical Technology and Metallurgy Pub Date : 2024-01-03 DOI: 10.59957/jctm.v59.i2.2024.21

Tihomir Petrov, L. Aljihmani

引用次数: 0

SIGNIFICANCE OF ASSESSMENT AND COMMUNICATION WITH THE TEACHER IN THE CHEMICAL TECHNOLOGY LEARNING PROCESS 在化学技术学习过程中评估和与教师交流的意义

Journal of Chemical Technology and Metallurgy Pub Date : 2024-01-03 DOI: 10.59957/jctm.v59.i2.2024.29

Silvia Traykova, L. Radev

{"title":"SIGNIFICANCE OF ASSESSMENT AND COMMUNICATION WITH THE TEACHER IN THE CHEMICAL TECHNOLOGY LEARNING PROCESS","authors":"Silvia Traykova, L. Radev","doi":"10.59957/jctm.v59.i2.2024.29","DOIUrl":"https://doi.org/10.59957/jctm.v59.i2.2024.29","url":null,"abstract":"Given the complexity of the learning content, in modern engineering education, the need for feedback from the students is also relevant. Not only during an exam when they demonstrate the outcomes of their studying. There is a need to research students’ opinions on effective communication with teachers, teaching methods and assessment. The goal of this publication is to show the results of a study conducted with students in the Fundamentals of Chemical and Metallurgical Technologies (FCME) major at the University of Chemical Technology and Metallurgy (UCTM), Sofia. Students’ opinions are presented regarding the teacher’s requirements for independent work and presentation of results, teaching methods and assessment of knowledge and skills. Respondents were third year full-time and part-time students at the Faculty of Chemical Technologies, major FCME. \u0000The outcomes of the study we conducted demonstrate that the use of different methods of teaching and assessment, as part of it, including giving tasks for self-assessment, increase students’ understanding and satisfaction of the learning process. Good communication between teachers and students, clear work requirements and criteria make the course content and assessment more understandable and meaningful for the students. They become active participants in the learning process, which leads to exhibited responsibility and commitment towards it. ","PeriodicalId":38363,"journal":{"name":"Journal of Chemical Technology and Metallurgy","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140514803","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}

引用次数: 0

INVESTIGATION OF WASTE BIOMASS ASH FROM PAPER INDUSTRY 造纸业废弃生物质灰调查

Journal of Chemical Technology and Metallurgy Pub Date : 2024-01-03 DOI: 10.59957/jctm.v59.i2.2024.18

Ekaterina Serafimova, Asya K. Manoylova, Vilma Stoyanova

{"title":"INVESTIGATION OF WASTE BIOMASS ASH FROM PAPER INDUSTRY","authors":"Ekaterina Serafimova, Asya K. Manoylova, Vilma Stoyanova","doi":"10.59957/jctm.v59.i2.2024.18","DOIUrl":"https://doi.org/10.59957/jctm.v59.i2.2024.18","url":null,"abstract":"The main part of companies in Bulgaria are built, however in the 70s, and upgraded last decade. The countrysupplies around 80 % of its supplies of paper, paperboard and pulp with own production. Integrated treatment ofwastes is a priority for realizing closed life cycle of materials. The aim of the present work is to investigate thecomposition and other important characteristics of biomass wood ash wasted from paper industry. The correlationsand associations among the chemical characteristics are also studied to find some basic trends and importantrelationships between two similar wastes from different enterprises. It was proved that all samples taken containedBa, Cr, Mn, Ni, Co, Al, Fe, Cu and Zn far below the legal limits for such type of products. A product has a certain anti-acidic effect. The other positive result was that the content of iron is between 34 to 60 mg per 1 kg dry waste. The microscopic photos confirmed that the particles are close to the nano-size materials. The content of the elements C, N, H is in good quantities and ratios, which is a prerequisite for their use as a soil improver. \u0000By the results of this study, it was confirmed that all samples produced as a result of the thermal treatment and final low water content achieved are free from pathogen microorganisms and different weed seeds, affecting the yield and soil sustainability. That allows determining the optimal ratio between the used components with a view to obtain products with desired thermal stability and physico-chemical properties as soil improvers.","PeriodicalId":38363,"journal":{"name":"Journal of Chemical Technology and Metallurgy","volume":"211 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140514621","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}

引用次数: 0