Electrical Resistivity as a Comparative Characteristic for the Metallurgical Evaluation of Manganese and Chromium Ore Raw Materials

2019 ◽  
Vol 2019 (9) ◽  
pp. 883-888
Author(s):  
A. V. Zhdanov
Keyword(s):  
Electrical Resistivity ◽  
Raw Materials ◽  
Comparative Characteristic ◽  
Chromium Ore ◽  
Metallurgical Evaluation

Influence of microbiological biofilm on the technological process of sugar production

2021 ◽  
Vol 9 (16) ◽  
pp. 221-228
Author(s):  
Tamila Sheiko ◽  
Keyword(s):  
Technological Process ◽  
Raw Materials ◽  
Sugar Industry ◽  
Rapid Development ◽  
Storage Conditions ◽  
Metal Corrosion ◽  
Comparative Characteristic ◽  
Sugar Production ◽  
Microbial Biofilms ◽  
Yield And Quality

During the processing of frozen and thawed sugar beets, invert sugar, in particular glucose and fructose, accumulates in them. This is due to the process of hydrolysis of carbohydrates. As a result of temperature fluctuations, beets lose elasticity, and tissue walls become soft. The activity of microorganisms intensifies on damaged beets. In the sugar industry, harmful microorganisms enter the production with raw materials, water, unwashed soil and air. Under improper storage conditions of raw materials the rapid development of microorganisms begins leading to sugar loss. The microflora of raw materials in sugar production is due to spore-forming and non-spore-forming bacteria, as well as micromycetes. Processing in the production of such raw materials is complicated. This leads to non-rhythmic operation of the sugar factory, technological processes and metal corrosion of technological equipment. Sugar yield and quality are significantly reduced. An important factor is the protection from the formation of microbial biofilms. The article considers the problem of formation of microbial biofilm in the process of obtaining diffusion juice in the sugar industry. The structure of the biofilm and its stability over time are considered. Under the conditions of active biofilm formation, uncontrolled unaccounted losses of sucrose are observed. Under conditions of low-quality beet processing, biocides and enzymes must be used in the production. They reduce the contamination of intermediate products by microorganisms, greatly facilitate the technological process. They also allow you to predict unaccounted sugar losses and improve its quality and yield. The article considers the effect of different types of biocides on dextran, which is an example of the formation of microbial biofilms. The comparative characteristic of influence of biocides on dextran is given and their resistance is noted.

Natural Jerusalem artichoke syrups with prebiotic properties

2021 ◽  
pp. 15-21
Author(s):  
Сергей Леонидович Филатов ◽  
Марина Сергеевна Михайличенко ◽  
Сергей Михайлович Петров ◽  
Надежда Михайловна Подгорнова
Keyword(s):  
Weight Control ◽  
Raw Materials ◽  
Jerusalem Artichoke ◽  
Comparative Characteristic ◽  
Plant Materials ◽  
Low Calorie ◽  
Plant Raw Materials ◽  
High Fructose ◽  
Materials Used ◽  
Low Glycemic Index

Выполнен обзор коммерчески доступных сиропов из различного натурального растительного сырья, используемых в качестве альтернативных сахару подслащивающих веществ пониженной калорийности, здорового углеводного профиля, с пребиотическими свойствами. Приведена общая характеристика и отражен химический состав растительного сырья (топинамбур, цикорий) и сиропов (из сорго, якона, агавы, кленовый, пальмовый, кукурузный), минеральные вещества (макро- и микроэлементы), витамины. Предложена и в производственных условиях апробирована современная инновационная мембранная технология получения фруктозно-глюкозного и фруктоолигосахаридного биосиропов из топинамбура, направленная на наиболее полное использование и сохранение природного состава клеточного сока растения. Фруктоолигосахариды топинамбура обладают пребиотическими свойствами, являются низкокалорийными подсластителями, создают чувство сытости, способствуют контролю массы тела, облегчают пищеварение, имеют низкий гликемический индекс и не вызывают кариес. Для апробации использования в пищевой промышленности приведена сравнительная характеристика сиропов из сахарной свеклы и топинамбура, которые получены на промышленном предприятии. Биосиропы с высоким содержанием фруктозы и олигофруктозный сироп изучены по углеводному составу и протестированы в приготовлении безалкогольных напитков. A review of commercially available syrups from a variety of natural plant materials used as alternatives to sugar, low-calorie sweeteners with a healthy carbohydrate profile and prebiotic properties is reviewed. The general characteristics and the chemical composition of plant raw materials (Jerusalem artichoke, chicory) and syrups (sorghum, yacon, maple, agave, palm, corn) are given: minerals (macro- and microelements), vitamins. A modern innovative membrane technology for producing fructose-glucose and fructo-oligosaccharide biosyrups from Jerusalem artichoke has been proposed and tested in production conditions, aimed at the most complete use and preservation of the natural composition of the plant cell juice. Jerusalem artichoke fructo-oligosaccharides have prebiotic properties, are low-calorie sweeteners, create a feeling of satiety, promote weight control, facilitate digestion, have a low glycemic index and do not cause tooth decay. For approbation of use in the food industry, a comparative characteristic of sugar beet and Jerusalem artichoke syrups, which are obtained at an industrial enterprise, is given. High fructose biosyrups and oligofructose syrup have been studied for their carbohydrate composition and tested in the preparation of soft drinks.

Structural, Electrical and Dielectric Properties of Uranium Doped Barium Titanate

2006 ◽  
Vol 514-516 ◽  
pp. 1269-1273
Author(s):  
Cornel Miclea ◽  
Constantin Tanasoiu ◽  
Corneliu Florin Miclea ◽  
Anca Gheorghiu
Keyword(s):  
Dielectric Constant ◽  
Electrical Resistivity ◽  
Barium Titanate ◽  
Mixed Oxides ◽  
Raw Materials ◽  
Uranium Content ◽  
Sudden Increase ◽  
Sharp Maximum ◽  
Order Of Magnitude ◽  
Titanate Ceramics

The influence of uranium doping up to 2 at. % on grain size, electrical resistivity and dielectric constant of barium titanate ceramics has been investigated. The samples were prepared by the conventional ceramic technique using pure raw materials. The mixed oxides were calcined at 1100 oC. The pressed pellets were sintered at temperatures between 13001500 oC in controlled atmosphere of argon and oxygen. The electrical resistivity drastically decreased, from 109 to 103 cm, with increasing uranium content up to 1.5 at. % and increased thereafter to about 107 cm, for 2 at. % U. The dielectric constant slightly increased with increasing U-content, up to about 1 at. % U and then shows a sudden increase with about two orders of magnitude, having a sharp maximum at 1.5 at. % U, when sintered in argon atmosphere compared to only half an order of magnitude when sintered in oxygen atmosphere. The results are discussed in terms of the possible A and B sites occupied by uranium as well as the boundary layer enriched with vacancies.

scholarly journals ANALYSIS OF THE POSSIBILITIES OF IMPROVING THE QUALITY OF INSULATION FROM SECONDARY RAW MATERIALS AND THE PROSPECTS OF THEIR USE IN CONSTRUCTION

2021 ◽  
pp. 85-90
Author(s):  
А. V. RADKEVICH ◽  
V. I. ANIN ◽  
V. V. RADCHENKO ◽  
A. A. SHUVAEV
Keyword(s):  
Information Technologies ◽  
Flame Retardants ◽  
Building Materials ◽  
Raw Materials ◽  
Construction Materials ◽  
Comparative Characteristic ◽  
Value Analysis ◽  
Secondary Raw Materials ◽  
Modern Technologies

Purpose. Research and analysis of opportunities to improve the quality of insulation from secondary raw materials to study the prospects of their use in the construction industry as innovative materials with better performance than traditional ones. Materials made from secondary raw materials are of great importance not only in the formation of the building materials market, but also in the Ukrainian economy. The processing infrastructure creates a large number of jobs and tax deductions to the budget. In addition, the consumption of energy resources and the cost of servicing energy mains directly depend on the improvement of the thermal efficiency of premises and structures. The use of modern technologies of building materials combines economy, efficiency and durability of structures. Methodology. An important role in the development of modern construction production is played by the possibility of developing and improving the quality of building materials and technologies for their use. In modern conditions of the market of construction products there is an urgent need for constant modernization of construction processes, due to the efficient use of raw materials and the latest processing methods. With the use of modern information technologies and theoretical and methodological ways to solve problems, it becomes possible to consider options for improving the characteristics of building materials by combining qualitative characteristics and eliminating negative ones. Findings. This paper presents scientifically sound methods of modernization of secondary raw materials in the composition of insulation materials with high thermal and economic characteristics, which are able to compete in the market with traditional building materials. The analysis of flame retardants was carried out. Originality. Theoretical and methodological directions have been formed on the basis of research on the use of secondary raw materials for the manufacture of insulation in construction. The comparative characteristic is carried out. The conclusion on the competitiveness of the presented materials in the market of construction materials is made. Practical value. Analysis of the application of modern technologies for recycling on the basis of the latest theoretical and practical approaches, with the subsequent elimination of shortcomings. Consideration of the possibility of adding flame retardants to the composition of materials. Use of materials as insulation of premises and buildings. Development of processing infrastructure of Ukraine.

scholarly journals Ultramafic rocks of the Aganozero chromium ore deposit (South Karelia) as a non-conventional magnesium-silicate raw material for the production of new ceramic materials

2019 ◽  
Author(s):  
V.P. Ilyina ◽  
P.V. Frolov
Keyword(s):  
Raw Materials ◽  
Practical Interest ◽  
Magnesium Silicate ◽  
Ceramic Materials ◽  
Raw Material ◽  
Ultramafic Rocks ◽  
Practical Application ◽  
Ore Deposit ◽  
Chromium Ore ◽  
Technological Level

Ultramafic rocks of the Aganozero chromium ore deposit located in South Karelia are of practical interest as a high-Mg raw material for industrial application. The preliminary results of the study of high-Mg rocks and minerals from the Aganozero deposit for the production of new materials are reported. The high technological level and economic efficiency of the ceramic materials produced, based on Karelia’s high-Mg rocks and industrial minerals, were achieved by reducing energy consumption and simplifying the technological process. The practical application of local types of mineral products will increase the raw materials potential for the production of various types of refractories and industrial ceramics.

scholarly journals THE EFFECT OF THE ENERGY PROCESS ON THE CHEMICAL COMPOSITION OF PLANT RAW MATERIAL OB-TAINED FROM LEAVES OF THE ASPEN OF THE GENERAL

2018 ◽  
pp. 251-259
Author(s):  
Aleksandra Viktorovna Nekhorosheva ◽  
Sergey Viktorovich Nekhoroshev ◽  
Aleksey Anatol'yevich Drenin ◽  
Erkin Hozhiakbirovich Botirov ◽  
Nikolay Viktorovich Gornikov ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Raw Materials ◽  
Biologically Active ◽  
Raw Material ◽  
Comparative Characteristic ◽  
Active Components ◽  
Extractive Substances ◽  
Vegetable Raw Materials ◽  
Analytical Approaches

The analysis of the chemical composition of the vegetable raw materials received from leaves of an aspen ordinary, family plants Willow (Salicaceae), growing in the territory of the Khanty-Mansi autonomous district Yugra is provided in article. The choice of raw materials is caused by a large supply and fast reproducibility of a raw resource. In work numerical indicators and indicators of high quality of raw materials are established (humidity, the general ashes, sulphatic ashes, ashes not soluble in 10% to hydrochloric acid, extractive substances). The way of extraction of vegetable raw materials is reasonable, the comparative characteristic of content of extractive substances is provided in the received extracts. It is shown that the average content of extractive substances in native samples is 27.9%, the content of polysaccharides – 10.9%. The qualitative and quantitative analysis of biologically active agents is carried out by method of a highly effective liquid chromatography. The dominating components in samples of the plants growing in the territory of one land plot are салицин 510 mg of %, гиперозид 170 mg of %, routines of 210 mg of %. Influence of process of fermentation on the chemical composition of the vegetable raw materials received from leaves of an aspen ordinary is studied. The greatest exit of phenolic connections at impact on vegetable raw materials of fermentation is established by cold. The positive effect of impact of fermentation by crushing on quantity of the identified biologically active components is defined. Work was carried out for assessment of phytochemical parameters of quality of vegetable raw materials and formation of justification of analytical approaches to diagnostics of vegetable raw materials of the explored territory.

The thermoelectric properties of CoSb3 compound doped with Te and Sn synthesized at different pressure

2017 ◽  
Vol 31 (28) ◽  
pp. 1750261 ◽  
Author(s):  
Yiping Jiang ◽  
Xiaopeng Jia ◽  
Hongan Ma
Keyword(s):  
Thermal Conductivity ◽  
High Pressure ◽  
Electrical Resistivity ◽  
High Temperature ◽  
Seebeck Coefficient ◽  
Thermoelectric Properties ◽  
Figure Of Merit ◽  
Raw Materials ◽  
Absolute Value ◽  
Dimensionless Figure Of Merit

The skutterudite CoSb[Formula: see text]Te[Formula: see text]Sn[Formula: see text] compound was synthesized successfully by high pressure and high temperature (HPHT) method using Co, Sb, Te and Sn powder as raw materials. The effects of pressure on its structure and the thermoelectric properties are investigated systematically from 300 K to 800 K. The electrical resistivity and the absolute value of the Seebeck coefficient for the sample increases with rising synthetic pressure. The thermal conductivity of the sample decreases with synthetic pressure and temperature rising in the range of 300–800 K. In this study, the maximum dimensionless figure of merit (ZT) value of 1.17 has been achieved at 793 K, 3 GPa for this thermoelectric material.

scholarly journals Preliminary assessment of the radiation-hygienic situation at the Aganozero complex deposit

2019 ◽  
Author(s):  
Александр Савицкий ◽  
Вера Ильна ◽  
Владимир Кевлич
Keyword(s):  
Building Materials ◽  
Raw Materials ◽  
Geological Survey ◽  
Complex Object ◽  
Laboratory Studies ◽  
Preliminary Assessment ◽  
Ore Deposit ◽  
Chromium Ore

The Aganozero chromium ore deposit, located in the Pudozh District, Karelia, is a complex object for ore and non-metalliferous useful minerals such as chromium ores, platinoids, chrome spinellids as well as Mg-bearing and high-Mg raw materials, e.g. serpentinite, olivinite, dunite and building materials. The primary goal of the present paper is to assess the radiation-hygienic situation at the Burakovian-Shalozero-Aganozero massif, which comprises the Aganozero deposit. Our assessment is essential in connection with the Megaproject to be launched in Karelia, where the Aganozero deposit will play the key role. Our assessment is based on the field and laboratory studies conducted by the authors with regard for the data obtained for this deposit by the Karelian Geological Survey and the appraisal of the radiation-hygienic situation in the Pudozh District done earlier by Nevskgeologia GTP, VSEGEI.

Gilsonite exploration by using electrical resistivity tomography with multi-electrode gradient array: Acase study in Rionegro (Colombia)

2020 ◽  
Vol 19 (2) ◽  
pp. 77-83
Author(s):  
Yesid Paul Goyes-Peñafiel ◽  
Sait Khurama-Velasquez ◽  
Oleg Nikolaevich-Kovin
Keyword(s):  
Electrical Resistivity ◽  
Electrical Resistivity Tomography ◽  
Raw Materials ◽  
Geophysical Methods ◽  
Viable Alternative ◽  
Resistivity Tomography ◽  
Subsurface Exploration ◽  
Rocky Outcrops ◽  
Solid Hydrocarbons ◽  
La Luna

Subsurface exploration using geophysical methods has increased the prospective economic possibilities for new non-metallic minerals and other raw materials such as solid hydrocarbons. In this paper, we show results of electrical resistivity tomography (ERT) carried out by using the multi-electrode gradient array, and conducted with the main purpose ofmapping thehighresistivity anomalies relatedto the presence of solid hydrocarbons bodies. ERT profiles were interpreted trough considering the gilsonite evidence on rocky outcrops in the La Luna Formation (Ksl) and their respective lithological contact with the Bocas Formation (Jb). This study concludes that,both on thesurface and in the subsurface, in the stratification plane of La Luna Formation, the gilsonite is a tabular and oblique shape, and the contact Ksl-Jb is faulty with an almost vertical inclination.However,different structural processes have contributed to theirregularformation and massive body of gilsonite. Finally,the study concludes that resistivity tomographies represent a reliable alternative for preliminary exploration stages. Sincethe cost of the methodisrelatively low in Colombia, it also serves as aneconomically viable alternative for small exploratory projects.

Study and Design of Chromium Ore Smelting Reduction Process for Producing Stainless Steel in a Converter

2011 ◽  
Vol 230-232 ◽  
pp. 164-167 ◽  
Author(s):  
Yan Liu ◽  
Mao Fa Jiang ◽  
De Yong Wang
Keyword(s):  
Stainless Steel ◽  
Raw Materials ◽  
Reduction Process ◽  
Raw Material ◽  
Smelting Reduction ◽  
Iron And Steel ◽  
Chromium Ore ◽  
Rational Production ◽  
Iron And Steel Works ◽  
Selection Of

This paper describes the concept of the construction of steelmaking shop, which is carried out as part of a modernization plan aimed at creating a 21st century environmental-friendly iron and steel works, designs the smelting reduction process of producing stainless steel crude melts in a 150 t converter and presents an outline of the equipment specifications and the conditions of operation, according to the blowing conditions of 185 t smelting reduction converter of No.4 steelmaking shop in Chiba Works of JFE Steel. In the future, a rational production system will be constructed by flexible selection of raw materials in response to changing stainless steel raw material prices and further improvement in productivity and quality, making the maximum use of functions of the equipment.

Sign in / Sign up

Export Citation Format

Share Document