scholarly journals Development of composition and process of obtaining multicomponent ferroalloys

2020 ◽  
Vol 63 (10) ◽  
pp. 791-795
Author(s):  
V. I. Zhuchkov ◽  
O. V. Zayakin
Keyword(s):  
Main Product ◽  
Raw Materials ◽  
Ferroalloy Production ◽  
Service Characteristics ◽  
Physicochemical Processes ◽  
Metal Processing ◽  
Progressive Technology ◽  
Complex Ferroalloys ◽  
New Generation ◽  
High Degree

The main product of ferroalloy plants is standard ferroalloys. They often do not have all the necessary service characteristics and are not very suitable for metal processing in a ladle. The developing progressive technology of steelmaking is forced to adapt to the existing range of ferroalloys, the standards for which have not been updated for 50 years or more. In addition, in recent years, the sources and markets of ferroalloy raw materials have changed, and their quality and content of leading elements have decreased. This makes it difficult or excludes the possibility of obtaining ferroalloys according to existing standards. In this regard, the production of more efficient ferroalloys of a new generation is required, suitable for progressive processes in the developing areas of ferrous and non-ferrous metallurgy 795 and smelted from non-traditional types of domestic ore raw materials. These include complex or multicomponent ferroalloys containing, in addition to iron, two or more functional elements. Complex ferroalloys should be created in the most favorable combinations of component. It contributes to the necessary effective impact on the iron-carbon melt with a high degree of assimilation of useful elements in it. The creation of scientific foundations for the formation of new compositions of multicomponent ferroalloys with high consumer properties, and the development of physicochemical processes for obtaining these alloys from unconventional ore raw materials contributes to solving the problems of developing compositions of effective new generation ferroalloys and expanding the ore base of ferroalloy production. When using the developed method of designing the composition of complex ferroalloys using unconventional raw materials, melting technologies were developed; various alloys of the systems were obtained and applied on a laboratory and industrial scale: Fe – Si – Cr, Fe – Si – B, Fe – Si – Ba – Ca, Fe – Si – Al – Nb, Fe – Si – Ca – Mg, Fe – Si – V – Ca – Mn, Fe – Si – Al.

scholarly journals Prediction of melting time of complex ferroalloys by physical and chemical modeling

2019 ◽  
pp. 205-214
Author(s):  
A.F. Petrov ◽  
I.R. Snihura ◽  
L.A Golovko ◽  
N.A. Tsyupa
Keyword(s):  
Interatomic Interaction ◽  
Ferroalloy Production ◽  
Melting Time ◽  
National Academy Of Sciences ◽  
Chemical Modeling ◽  
Method Of Calculation ◽  
Metal Melts ◽  
Composition Structure ◽  
Complex Ferroalloys ◽  
New Generation

The purpose of this work is to implement a new approach to the description of the duration of melting (dissolution) of complex new generation ferroalloys during the deoxidation and doping of a metal melt. This approach is aimed at developing a methodology and criteria for the quantification and accounting of the micro-heterogeneity of multicomponent metal melts and their prediction on such important for steelmaking production characteristics as the melting time of ferroalloys, the description of the inter-mine interaction, which allows a deeper understanding of the process. deoxidation and refining of steel. In the work, the approach developed in the Institute of Ferrous Metallurgy of the National Academy of Sciences of Ukraine to solve problems of modeling of non-conformities that relate the composition, structure and properties of melts is used in the work. It is based on the original concept of physicochemical modeling of the processes of interatomic interaction in melts and solutions, developed by E.V. Prihodko. According to it, metal melts are considered as chemically unified systems. Changing their composition affects the complex of physicochemical properties due to changes in the parameters of their electronic structure. The method of calculation of criteria (∆Zy and d), characterizing the degree of difference between the electronic and structural state of the melt, as a chemically unified system, from the mechanical mixture of their initial components and the parameter was used to evaluate and account for the influence of the micron homogeneity of the structure of the metal melts of ferroalloy production. ρl, which takes into account the cluster spin in metal melts. Using these criteria and the available experimental data, analytical dependences were obtained to calculate the melting time of complex (ma-manganese, vanadium, niobium and boromatic) ferroalloys of the new generation. This will allow them to evaluate their effectiveness of application, which is associated with the highest assimilation of the main elements that affect

A possibility of using nickel concentrate, obtained as a result of hydrometallurgical enrichment of manganese-containing raw materials, at steel alloying

2020 ◽  
Vol 76 (7) ◽  
pp. 709-715
Author(s):  
O. Yu. Kichigina
Keyword(s):  
Raw Materials ◽  
Experimental Studies ◽  
Selective Extraction ◽  
Technological Parameters ◽  
Nickel Iron ◽  
Nickel Recovery ◽  
Nickel Concentrate ◽  
Steel Alloying ◽  
High Degree ◽  
Comprehensive Processing

At production of stainless steel expensive alloying elements, containing nickel, are used. To decrease the steel cost, substitution of nickel during steel alloying process by its oxides is an actual task. Results of analysis of thermodynamic and experimental studies of nickel reducing from its oxide presented, as well as methods of nickel oxide obtaining at manganese bearing complex raw materials enrichment and practice of its application during steel alloying. Technology of comprehensive processing of complex manganese-containing raw materials considered, including leaching and selective extraction out of the solution valuable components: manganese, nickel, iron, cobalt and copper. Based on theoretical and experiment studies, a possibility of substitution of metal nickel by concentrates, obtained as a result of hydrometallurgical enrichment, was confirmed. Optimal technological parameters, ensuring high degree of nickel recovery out of the initial raw materials were determined. It was established, that for direct steel alloying it is reasonable to add into the charge pellets, consisting of nickel concentrate and coke fines, that enables to reach the through nickel recovery at a level of 90%. The proposed method of alloying steel by nickel gives a possibility to decrease considerably steel cost at the expense of application of nickel concentrate, obtained out of tails of hydrometallurgical enrichment of manganese-bearing raw materials, which is much cheaper comparing with the metal nickel.

Current Progress in Biomedical Applications of Chitosan-Carbon Nanotube Nanocomposites: A Review

2020 ◽  
Vol 20 (16) ◽  
pp. 1619-1632
Author(s):  
Katarzyna Pieklarz ◽  
Michał Tylman ◽  
Zofia Modrzejewska
Keyword(s):  
Carbon Nanotube ◽  
Medical Science ◽  
Antimicrobial Properties ◽  
Polymer Materials ◽  
Biological Macromolecules ◽  
Medical Sciences ◽  
New Generation ◽  
High Degree ◽  
Dressing Materials

The currently observed development of medical science results from the constant search for innovative solutions to improve the health and quality of life of patients. Particular attention is focused on the design of a new generation of materials with a high degree of biocompatibility and tolerance towards the immune system. In addition, apart from biotolerance, it is important to ensure appropriate mechanical and technological properties of materials intended for intra-body applications. Knowledge of the above parameters becomes the basis for considerations related to the possibilities of choosing the appropriate polymer materials. The researchers' interest, as evidenced by the number of available publications, is attracted by nanobiocomposites based on chitosan and carbon nanotubes, which, due to their properties, enable integration with the tissues of the human body. Nanosystems can be used in many areas of medicine. They constitute an excellent base for use as dressing materials, as they exhibit antimicrobial properties. In addition, they can be carriers of drugs and biological macromolecules and can be used in gene therapy, tissue engineering, and construction of biosensors. For this reason, potential application areas of chitosan-carbon nanotube nanocomposites in medical sciences are presented in this publication, considering the characteristics of the system components.

Embodying values and socio-religious difference: new markets of moral learning in Christian and Muslim schools in urban Tanzania

Africa ◽  
2017 ◽  
Vol 87 (3) ◽  
pp. 513-536 ◽  
Author(s):  
Hansjörg Dilger
Keyword(s):  
Young People ◽  
Dar Es Salaam ◽  
Urban Environments ◽  
Educational Settings ◽  
Children And Young People ◽  
Moral Learning ◽  
Moral Frameworks ◽  
New Generation ◽  
High Degree ◽  
Self Formation

AbstractSchools are institutionalized spaces of learning where children and young people are trained to become morally and ethically responsible members of society. Cultural ideas and values relating to friendship, social status and the nation, but also regarding one's own body, dress and emotional, verbal or gestural expression, are learned and performed by young people on an everyday basis. In this article, I build on ethnographic research on the ‘new’ generation of Christian and Muslim schools in Dar es Salaam, Tanzania (2008–10), and I show that particular ways of learning and performing values can be understood as a form of embodied morality that orients students and teachers in relation to their educational and socio-urban environments. I argue that schools do not represent monolithic ethical or moral frameworks or that the actors in these educational settings learn or embody those frameworks in uniform ways. Rather, the processes of ethical and moral (self-)formation are often highly fragmented due to the diverse (social, religious and economic) backgrounds of students and teachers as well as the logics of class formation in the neoliberal market, which causes a high degree of fluctuation across the (equally fragmented) educational landscape of Dar es Salaam. I therefore define ‘embodied morality’ as a partial and discontinuous practice whose specific forms and experience are inseparably entwined with the specific ideological, social and institutional environments of particular educational settings.

scholarly journals Cryogenic technologies in biology and medicine

2020 ◽  
Vol 2020 (2b) ◽  
pp. 129-134
Author(s):  
O.I. Ossetsky ◽  
◽  
O.S. Snurnikov ◽  
Keyword(s):  
Public Health ◽  
Food Industry ◽  
Raw Materials ◽  
Biologically Active ◽  
Whole Body ◽  
Active Ingredients ◽  
Lipid Fractions ◽  
The World ◽  
New Generation

Cryogenic technologies in biology and medicine Current tendencies of the development of cryogenic technologies in the world practice and in Ukraine have been comparatively analyzed. A special attention has been paid to cryotechnologies in biology and medicine. The features of deriving the biologically active ingredients of natural raw materials by means of cryosublimation fractionation and extraction of lipid fractions with liquefied refrigerants, as well as perspectives of their application when obtaining the products of new generation in pharmacy, cosmetics, food industry have been considered. There were discussed the possibilities of human whole body extreme cryotherapy. Main aspects of its usage in practical public health have been considered.

scholarly journals Food fortification – a modern principle of the food industry

2020 ◽  
Vol 12 ◽  
pp. 70-76
Author(s):  
V.G. Kaishev ◽  
Keyword(s):  
Raw Materials ◽  
Caloric Intake ◽  
Food Products ◽  
Technical Literature ◽  
Short Supply ◽  
Mass Consumption ◽  
Organoleptic Characteristics ◽  
Physiological Properties ◽  
Physico Chemical ◽  
New Generation

Aim. To analyze the scientific and technical literature and identify ways to create a new generation of mass-consumption food products enriched with vital nutrients. Discussion. The main malnutrition of the Russian population is the excess of caloric intake over an indicator of the level of energy consumption. One of the ways to solve this problem is the production of functional food products or enriched functional products. The essence of this is that only those micronutrients that are really in short supply should be used in the fortification of products. These should be products of mass consumption, and especially those that undergo refining, which results in the loss of micronutrients. The use of raw materials and ingredients only of natural (animal, vegetable, mineral) origin, allows you to create active complexes that qualitatively change the physiological properties of the product, and can affect many product characteristics and processes such as physico-chemical, structural-mechanical and organoleptic characteristics of the product, the processes of color formation, fermentation, oxidation, storage capacity. However, sometimes a strong passion for enriching the product with useful macro- and micronutrients affects the taste characteristics. Conclusion. When developing recipes and technologies for new-generation products, it is necessary that the enrichment of the product with important and necessary elements does not worsen the organoleptic characteristics. At the same time, it is necessary to ensure the safety of products without compromising consumer properties. The diet should contain all the necessary nutrients (nutrients) for a person in sufficient quantities and balanced with each other in the most favorable proportions.

scholarly journals INVESTIGATION OF DECOMPOSITION OF PHOSPHATE RAW MATERIALS IN THE PRESENCE OF PEAT USING PHOSPHORIC ACID

2020 ◽  
Vol 55 ◽  
pp. 10-15
Author(s):  
Katerina I. Panova ◽  
◽  
Nicolay N. Pravdin ◽  
Аnatoliy О. Kiryanov ◽  
◽  
...  
Keyword(s):  
Nitric Acid ◽  
Phosphoric Acid ◽  
Raw Materials ◽  
Raw Material ◽  
Material Component ◽  
High Degree

In the process of decomposition of phosphate raw materials, the dynamics of transformation of its constituent mineral phosphoric components: fluorapatite and its derivatives into available for plants dihydro - and hydroorthophosphates of calcium and the influence of a natural organic activator on it are studied.. The composition of the obtained organomineral products was evaluated. The questions of intensification of processing of phosphorite in phosphate-peat systems with additional involvement of nitric acid are considered. The possibilities of reducing the amount of acidic reagents to 50% are shown, while guaranteeing a high degree of use of the target raw material component (94%) and the absence of waste.

scholarly journals The Issues and Challenges Faced by Malay Cuisine in the Foreign Market

2021 ◽  
Vol 16 (2) ◽  
pp. 20-28
Author(s):  
Rahman Abdullah ◽  
Aniza Arifin ◽  
Azlina Samsudin ◽  
Sabaianah Bachok ◽  
Harnizam Zahari
Keyword(s):  
Cultural Heritage ◽  
Success Factors ◽  
Raw Materials ◽  
Country Of Origin ◽  
Foreign Market ◽  
Future Research ◽  
Traditional Food ◽  
Meal Preparation ◽  
New Generation

The traditional food of a culture in a society is continuously inherited from the old generation to the new generation. The traditional element is an in-depth understanding of the function of each material, techniques of preparation, and the practice in our daily cooking. This understanding in the form of preparation, meal preparation, tips, use of certain equipment, and raw materials are mysteries difficult to be unravelled. The Malay cultural heritage food is an integral asset among Malaysians in general and the Malay race in particular. Malay cuisine is one of the special and unique blended of many traditions from around the region. However, when Malay culture and cuisine are introduced to other countries, they faced certain hurdles and challenges. This study investigates the issues and challenges faced by Malay cuisine in the foreign market. The points in question are, 1) Why are Malay cuisine difficult to be exported to other countries 2) Why Malay cuisine is less popular than cuisines from other countries? 3) What are the factors that make foods from a country of origin can be successfully exported? These issues and challenges will be parsed and discussed based on the existing written collection. Recommendations will be made on the mechanisms that enable the success of Malay cuisine food to be commercialized abroad, as well as future research examining the success factors of traditional food exported abroad.  

Enrichment — the way to create a new generation of food products

2020 ◽  
pp. 36-40
Author(s):  
O.V. Sycheva ◽  
V.G. Kayshev
Keyword(s):  
Raw Materials ◽  
Caloric Intake ◽  
Food Products ◽  
Short Supply ◽  
Mass Consumption ◽  
Organoleptic Characteristics ◽  
Physiological Properties ◽  
Physico Chemical ◽  
New Generation ◽  
And Storage

The main dysnutrition of the Russian population is the excess of caloric intake over an indicator of the energy consumption level. One of the ways to solve this problem is the production of functional food products or enriched functional products. The essence of this is that only those micronutrients that are really in short supply should be used in the fortification of products. These should be products of mass consumption, and especially those that undergo refining, which results in the loss of micronutrients. The use of raw materials and ingredients only of natural (animal, vegetable, mineral) origin allows creating active complexes that qualitatively alter the physiological properties of the product and can affect many product characteristics and processes such as physico-chemical, structural, mechanical and organoleptic characteristics of the product, the processes of color formation, fermentation, oxidation, and storage capacity. However, sometimes a strong passion for enriching the product with useful macro- and micronutrients affects the taste characteristics. Therefore, when developing recipes and technologies for new-generation products, it is crucial that the enrichment of the product with important and necessary elements should not deteriorate the organoleptic characteristics. At the same time, it is essential to ensure the safety of products without compromising consumer properties. The diet should contain all the nutrients necessary for a person in sufficient quantities and balanced with each other in the most favorable proportions

scholarly journals Solvent- and Catalyst-free Synthesis, Hybridization and Characterization of Biobased Nonisocyanate Polyurethane (NIPU)

Polymers ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1026 ◽  
Author(s):  
Xin He ◽  
Xiaoling Xu ◽  
Qian Wan ◽  
Guangxu Bo ◽  
Yunjun Yan
Keyword(s):  
Raw Materials ◽  
Ethylene Carbonate ◽  
Synthetic Method ◽  
Dimer Acid ◽  
Catalyst Free ◽  
Program Temperature ◽  
Novel Method ◽  
Nonisocyanate Polyurethane ◽  
High Degree

Nonisocyanate polyurethane (NIPU) is a research hotspot in polyurethane applications because it does not use phosgene. Herein, a novel method of solvent- and catalyst-free synthesis of a hybrid nonisocyanate polyurethane (HNIPU) is proposed. First, four diamines were used to react with ethylene carbonate to obtain four bis(hydroxyethyloxycarbonylamino)alkane (BHA). Then, BHA reacted with dimer acid under condensation in the melt to prepare four nonisocynate polyurethane prepolymers. Further, the HNIPUs were obtained by crosslinking prepolymers and resin epoxy and cured with the program temperature rise. In addition, four amines and two resin epoxies were employed to study the effects and regularity of HNIPUs. According to the results from thermal and dynamic mechanical analyses, those HNIPUs showed a high degree of thermal stability, and the highest 5% weight loss reached about 350 °C. More importantly, the utilization of these green raw materials accords with the concept of sustainable development. Further, the synthetic method and HNIPUs don’t need isocyanates, catalysts, or solvents.

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