scholarly journals SELECTION AND ANALYSIS OF RAW MATERIALS FOR A PROTECTIVE AND DECORATIVE LAYER OF COMPOSITE MATERIAL

Author(s):  
D. Bondarenko

With modern housing construction, the cost of finishing work has increased significantly. The development of protective and decorative coatings is necessary, with architectural and artistic advantages and high performance properties with a slight increase in cost. It is necessary to develop a high-quality multilayer monolithic composite with a high degree of adhesion of functional layers to each other. Glass industry waste of various fractions and coloring salts of metals are proposed to be used for a decorative layer, which allows to obtain an almost unlimited color gamut of the coating during plasma chemical modification. The choice of application of high-alumina refractory and alumina cement in the protective layer is justified due to their high thermal resistance to sudden temperature changes. Compositions of a protective layer based on binders and a decorative layer using crushed colored container glass and coloring metal salts moistened with a 5% aqueous solution of liquid glass have been proposed, which makes it possible to significantly expand the raw material base for obtaining functional coatings on concrete. The melt heating temperature and the kinetics of its cooling are determined in order to identify rational rates and duration of high-temperature treatment for further coating creation. Rational rates of plasma processing of composite material for the formation of coatings of various textures are revealed

2021 ◽  
pp. 382-387
Author(s):  
Е.А. Миронова ◽  
Е.С. Романенко ◽  
Н.А. Есаулко ◽  
М.В. Селиванова ◽  
Т.С. Айсанов ◽  
...  

Производство напитков функционального назначения в настоящее время имеет актуальное значение, при этом наиболее перспективными являются напитки, приготовленные на основе натуральных соков с добавлением ингредиентов, выделенных из растительного сырья, в том числе из плодово-ягодного. Помимо органических кислот, аминокислот, витаминов, пектиновых веществ, полифенолов и природных углеводов, эти напитки насыщены также дефицитными микронутриентами, оказывающими позитивное действие на состояние человеческого организма. В статье представлены результаты исследований по разработке рецептур и технологии производства высококачественных функциональных напитков на основе виноградного сока прямого отжима, обладающих улучшенными потребительскими свойствами за счет включения в их состав экстрактов плодово-ягодного сырья - фейхоа, ежевики и черной смородины. Приведена оценка показателей качества и безопасности разработанных напитков и процессуально-технологическая схема их производства. Работа выполнена на базе учебно-научной лаборатории технологии виноделия и продуктов питания из растительного сырья Ставропольского ГАУ. Для определения физико-химических показателей и пищевой ценности сырья, полупродуктов и приготовленных функциональных напитков применяли современные общепринятые методы исследований согласно действующих ГОСТ. Разработка технологии производства напитков на основе виноградного сока с применением плодово-ягодных экстрактов является особенно важной и актуальной задачей в связи с наличием разнообразной и доступной сырьевой базы на Юге России, а также высокой концентрацией в данном регионе плодоперерабатывающих производств, оснащенных современным высокопроизводительным оборудованием. Полученные нами результаты могут способствовать целенаправленному применению разработанных напитков в санаторно-курортном лечении населения для решения проблемы оптимизации питания и повышения пищевого статуса населения России. The production of functional beverages is currently of urgent importance, while the most promising are drinks prepared on the basis of natural juices with the addition of ingredients extracted from vegetable raw materials, including fruit and berry. In addition to organic acids, amino acids, vitamins, pectin substances, polyphenols and natural carbohydrates, these drinks are also saturated with scarce micronutrients that have a positive effect on the state of the human body. The article presents the results of research on the development of recipes and technology for the production of high-quality functional beverages based on direct-pressed grape juice, which have improved consumer properties due to the inclusion of extracts of fruit and berry raw materials - feijoa, blackberry and black currant in their composition. The evaluation of quality and safety indicators of the developed beverages and procedural and technological scheme of their production is given. The work was carried out on the basis of the educational and scientific laboratory of winemaking technology and food products from vegetable raw materials of the Stavropol State Agrarian University. To determine physicochemical parameters and nutritional value of raw materials, intermediates and prepared functional beverages, modern generally accepted research methods were used in accordance with the current GOST. The development of technology for the production of beverages based on grape juice using fruit and berry extracts is a particularly important and urgent task due to the presence of a diverse and affordable raw material base in the South of Russia, as well as a high concentration of fruit processing plants accomplished by modern high-performance equipment in this region. The results obtained by us can contribute to the purposeful use of the developed beverages in sanatorium treatment of the population to solve the problem of optimizing the nutrition and improving the nutritional status of the population of Russia.


2020 ◽  
Vol 24 (1) ◽  
pp. 90-102
Author(s):  
M. P. Stepanova ◽  
O. A. Sotnikova

Purpose of research is to study cheaper composite materials for building structures such as cement-free ones without heat treatment, which will undoubtedly allow finding their application in building industry. To achieve this goal it is necessary to identify patterns of structure formation of clinker-free contact condensation hardening composite materials in which portlandite crystals act as a matrix, and the physicochemical active component of natural origin acts as a filler.Methods. In accordance with the purpose set, one of the main tasks of the work was to be solved; it involved study-ing the patterns of structure formation of contact-condensation hardening systems relying on the basic principles of materials science, which include studying the influence of the composition, structure and state of the starting com-ponents on the properties of a composite material. In this work, we studied the role of the physicochemical activity of raw materials and the possibility of ‘combining’ a portlandite matrix with filling mechano-physicochemical active raw materials capable of producing new structures. To form the composite material, a compaction pressing technique at elevated specific pressures was used, which made it possible to implement the mechanisms of contact condensation technology of structure formation. The formation of physicochemical bonds of portlandite and aluminosilicate filler of various types is also possible with certain ratios of their mass fractions and V/I ratios the optimization of which was one of our objectives.Results. The result of this work is to assess the impact of raw material characteristics and technology parameters on the properties of the resulting material, namely, the improvement of the compacting pressure and the amount of filler when getting a compacted composite.Conclusion. The development of a technology of producing clinker-free contact condensation composites based on portlandite with aluminosilicate filler will expand the raw material base of local building materials, reduce their cost and energy consumption, that is, solve key issues of resource saving in the building materials production.


2020 ◽  
Vol 3 (1) ◽  
pp. 152-158
Author(s):  
Resta T. Mamakhatova

The article is devoted to modern problems of development of the coal industry in the Siberian Federal district. The article presents an overview of the current condition of the raw material base of the Siberian Federal district (distributed and unallocated subsoil reserve fund), which includes analysis and assessment of reserves and forecast resources of various brands of coal, according to their degree of study and readiness for industrial development. The provision of the coal industry with all categories of reserves and reserves of existing enterprises of the distributed Fund is determined. The problems of developing the mineral resource base of the coal industry are largely related to the objective features of the resource base of the coal industry, as well as to the problems that have accumulated over the past years of industry restructuring. The basis for the development of the fuel and energy complex of the Siberian Federal district should be large coal basins and deposits where coal can be extracted by large sections or mines in conditions that allow the use of high-performance technological complexes.


2021 ◽  
Vol 5 (6) ◽  
pp. 151
Author(s):  
Mustapha El Kanzaoui ◽  
Chouaib Ennawaoui ◽  
Saleh Eladaoui ◽  
Abdelowahed Hajjaji ◽  
Abdellah Guenbour ◽  
...  

Given the amount of industrial waste produced and collected in the world today, a recycling and recovery process is needed. The study carried out on this subject focuses on the valorization of one of these industrial wastes, namely the fly ash produced by an ultra-supercritical coal power plant. This paper describes the use and recovery of fly ash as a high percentage reinforcement for the development of a new high-performance composite material for use in various fields. The raw material, fly ash, comes from the staged combustion of coal, which occurs in the furnace of an ultra-supercritical boiler of a coal-fired power plant. Mechanical compression, thermal conductivity, and erosion tests are used to study the mechanical, thermal, and erosion behavior of this new composite material. The mineralogical and textural analyses of samples were characterized using Scanning Electron Microscopy (SEM). SEM confirmed the formation of a new composite by a polymerization reaction. The results obtained are very remarkable, with a high Young’s modulus and a criterion of insulation, which approves the presence of a potential to be exploited in the different fields of materials. In conclusion, the composite material presented in this study has great potential for building material and could represent interesting candidates for the smart city.


Author(s):  
I. F. Iskakov ◽  
G. A. Kunitsyn ◽  
D. V. Lazarev ◽  
А. А. Red`kin ◽  
S. A. Trubitsyn ◽  
...  

To use effectively internal raw material base, JSC “Ural Steel” accomplished I category major overhaul of the blast furnace No. 2. The main purpose of the overhaul was to design a rational profile which could ensure an ability to operate with a charge containing 95 % of Mikhailovskii GOK (mining and concentrating plant) pellets having basicity of 0.5 by CaO/SiO2. The blast furnace No. 2 having useful volume of 1232 m3, was constructed by design of Danieli Corus, the Netherlands, and was blown in on December 30, 2020. In the process of guarantee tests, step-by-step increase of Mikhailovskii GOK pellets (Fetotal = 60.5 %, CaO/SiO2 = 0.5) content in the charge iron ore part was being accomplished from 55 to 95.1%. Charging of the blend containing pellets in the amount of 55% of iron ore part, was done by charging system 4OOCC + 1COOCC (Ore - Coke) with filling level 1.5 m. Under conditions of pellets part increase in the blend, the charging system was changed to decrease their content at the periphery, to increase it in the ore ridge zone and make it intermediate between periphery and the ore ridge. At the pellets share in the iron ore raw materials 0.75 the charging system was used as the following: 3OOCC + 1COOC + 1COOCC, while at the content 95.1% the following charging system was used: 2COOC + 2COOC + 1COOCC. It was noted that in the period of guarantee tests the furnace running was smooth. The average silicon content in the hot metal was 0.70% at the standard deviation 0.666. Sulfur content in the hot metal did not exceed 0.024%, the blowing and natural gas consumption figures were 2100 m3/min and 11000 m3/min correspondently, oxygen content in the blowing 26.5%, hot blowing and top smoke pressure figures were 226.5 and 109.8 KPa correspondently. The productivity of the furnace was reached as high as 2358 t/day at the specific coke rate 433 kg/t of hot metal. After guarantee tests completion, the pellets content in the iron ore part was decreased gradually from 95 down to 50%. The decreasing was made by 5% in every 6 hours of operation. Application of the mastered technology of the blast furnace No. 2 with the increased share of pellets will enable to stably supply the blast furnaces No. 1, 3 and 4 by iron ore raw materials in the proportion of 30-35% of pellets and 65-70% of sinter.


2021 ◽  
Vol 316 ◽  
pp. 1050-1054
Author(s):  
V.N. Zyryanova ◽  
E.V. Lytkina ◽  
A.P. Ochur-Ool

Increasing water resistance and mechanical strength of hardening magnesian binders’ products can be achieved by introducing microfillings into a hardening dispersed system. It is shown that serpentine provides an increase strength and water resistance in hydration and hardening process, being as a structure-forming component, it intensifies this process. It allows expanding the raw material base for the production of magnesia binders for construction purposes.


2021 ◽  
Vol 9 (16) ◽  
pp. 90-97
Author(s):  
Kateryna Danilova ◽  
◽  
Oksana Zavarzina ◽  

An actual problem of the alcohol industry development is the expansion of the raw material base through the use of new, cheaper types of carbohydrate sources. Recently, glucose-fructose syrup has been of increasing interest to producers of ethanol. Among the producers of craft drinks, in particular rum-based drinks, cane molasses is in increasing demand. The article presents the technological aspects of the fermentation process of nonconventional sugar-containing raw materials on the example of glucose-fructose syrup and cane molasses in ethanol by different yeast strains. It is determined that glucose-fructose syrup and cane molasses are raw materials depleted of nitrogen, phosphorus and growth substances necessary for the yeast activity. To improve the technological properties of raw materials in the molasses, nitrogen, phosphorus nutrition and corn extract as a growth substance shall be added to a mash. Glucose-fructose syrup is of pH 3.68 and of acidity 0.12, which negatively affects the fermentation. It is established that in order to create optimal living conditions for yeast, it is necessary to add substances to the glucose-fructose syrup that will contribute to the safety of development and prevent the pH 3.5. It was determined that the alcohol yield from 1 ton of glucose-fructose syrup is 31.0 dal, from 1 ton of cane molasses is 24.0 dal on the yeast 46ED and 22 dal on the TegaYeast without the use of growth substances and vitamins necessary for the reproduction of yeast biomass. Under conditions of improving the technological properties of the mash from the glucose-fructose syrup and cane molasses by adding biologically active substances promoting the synthesis of yeast biomass, the ethanol content in the fermented mashes increases up to 11.9 12% vol.


2021 ◽  
Vol 9 (A) ◽  
pp. 313-317
Author(s):  
Svetlana Ivasenko ◽  
Ainur Zhumabekova ◽  
Agnieszka Ludwiczuk ◽  
Krystyna Skalicka–Wozniak ◽  
Alexandr Marchenko ◽  
...  

BACKGROUND: A possible reduction in stocks of medicinal plant raw materials of Thymus serpyllum L. and Thymus vulgaris L. leads to the need to expand the raw material base of the official medicinal plants with using of endemic species of the flora of Kazakhstan, in particular, Thymus rasitatus Klokov, and Thymus eremita Klokov. AIM: The aim of the study was to study the possibility of using 70% ethanol extracts of T. rasitatus and T. eremita as antimicrobial agents. MATERIALS AND METHODS: The aerial parts of T. rasitatus and T. eremita were extracted with 70% ethanol using ultrasound assisted extraction. The qualitative and quantitative analyses of the 70% ethanol extracts were determined using the liquid chromatography-detection-ESI-mass spectrometry-(MS)/MS technique. The study of the antimicrobial activity of these extracts was performed for eight strains of Gram-positive bacteria, six strains of Gram-negative bacteria, and four cultures of fungi. RESULTS: Chromatographic analysis of hydroalcoholic extracts of both investigated Thymus species showed very similar phenolic compounds composition. In both cases, the major components are luteolin-7-O-glucoside and rosmarinic acid. About 70% ethanol extracts of T. rasitatus and T. eremita have a broad spectrum of antimicrobial activity, exhibit the bactericidal or bacteriostatic activity against all tested bacteria and fungi at concentration range of 0.0195–20 mg/ml, but differ in their potency against tested strains of microorganisms. CONCLUSION: About 70% ethanol extracts of T. rasitatus and T. eremita, endemic plants in the flora of Kazakhstan, can be considered as potential drugs with a wide spectrum of antimicrobial activity. The results of chromatographic analysis could be used for drug standardization.


2020 ◽  
Author(s):  
P.A. Kozlov ◽  
A.M. Panshin ◽  
L.I. Leontiev

The increasing demand for zinc and a range of zinc-related metals (for example: lead; indium; tin; cadmium; and copper) in the Russian Federation cannot be satisfied by the existing production plants due to the lack of raw materials. At the same time, ferrous and non-ferrous metallurgy and the chemical industry have accumulated hundreds of millions of tons of zinc wastes (falling into the hazard categories 2 to 4), the processing of which could not only make up the raw material base, but also improve the environmental situation. In the world, over 85% of ferrous dust is recycled using the Waelz process. The Waeltz process is used for distilling separation of elements under reducing conditions. In this study, a block diagram for production of the following elements from industrial wastes is proposed: zinc, cadmium and indium in form of massive metals; zinc and indium in the form of fine powders; and clinker as a raw material for cement production. The technical and scientific details of this new process have been patented in the Russian Federation and abroad. For the first time, the following operations have been implemented with the use of large-sized Waelz kilns: vapour-oxidized Waeltz treatment of polymetallic wastes; recycling of heat from gases and solid products with generation of process fumes; and implementation of alternative flux (dolomite) and alternative fuel (petroleum coke). Keywords: Waelz process, industrial wastes, heat recycling, vapour-oxidized Waelz processing


2015 ◽  
Vol 1 (12) ◽  
Author(s):  
Slobodan Majstorović ◽  
Vladimir Malbašić ◽  
Miodrag Čelebić

Curent situation of raw material base and study of limestone like construction stone deposits in the Republic of Serbian were relatively poorly considered during the last decades, and the main problems are the following: low production capacity fragmentation of production, needs for raw materials homogenization and delivering of standard quality, undeveloped market, the recession of the domestic economy and the economies in the region, the relatively low level of exploration by many deposits, especially lack of knowledge of the occurrence legality for certain types and quality of raw materials and lack of complete quality indicators for raw material, which sometimes causes the utilization of only the highest quality deposit parts.This paper provides an overview of active quarries in the Republic Srpska with exploitation of limestone like technical building stone and present an attempt to determine the basic quantitative and qualitative characteristics of the raw material and the current working conditions at these quarries. The purpose of such a review would be in an effort to create a clearer picture about production, market, social and other aspects of the limestone exploitation in the Republika Srpska and the realistic possibilities of maintaining and developing of these mineral resources utilization, which can certainlybe interesting for the development of many other industries in the Republic Srpska.


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