Setting Time of Powder Composites and the Effect of Chemical Reagents

2021 ◽  
Vol 899 ◽  
pp. 675-680
Author(s):  
Soyibon S. Negmatov ◽  
Zokirkhon T. Munavvarkhanov ◽  
Murotbek B. Boydadaev ◽  
Alloberdi M. Madraximov
Keyword(s):  
Raw Materials ◽  
Setting Time ◽  
Chemical Reagents ◽  
Secondary Raw Materials ◽  
Powder Composites

Additives were selected and a method for modifying the structure of gypsum-containing materials for construction purposes and a method for their dispersion were developed. Based on the selected modifiers, effective compositions of composite gypsum-containing materials based on local and secondary raw materials were developed, and an increase in their strength and resistance to water was established.

scholarly journals The chemical reagents influence on the regulation of the powder composite materials setting time for construction purposes

2021 ◽  
Vol 264 ◽  
pp. 02006
Author(s):  
Zokirkhan Munavvarkhanov ◽  
Rustam Soliyev ◽  
Murotbek Boydadayev
Keyword(s):  
Calcium Sulfate ◽  
Water Resistance ◽  
High Efficiency ◽  
Raw Materials ◽  
Setting Time ◽  
Normal Operation ◽  
Chemical Reagents ◽  
Gypsum Plaster ◽  
The Republic ◽  
Short Setting Time

Additives were selected, and a method for modifying the structure of gypsum-containing materials for construction purposes and a method for their dispersion were developed. Based on the selected modifiers, effective compositions of composite gypsum-containing materials based on local and secondary raw materials were developed. An increase in their strength and resistance to water was established. The use of gypsum plaster mixes shows their high efficiency and advantages compared to traditional finishing works methods. They provide a high and stable level of finishing quality, reduced transportation costs, and easy recycling of materials. However, despite the high consumer properties, the modern use of compositions based on the most affordable gypsum raw materials in the Republic and the production of gypsum binder beta calcium sulfate semi hydrate is limited to plasters and putties for rooms with normal operation. This is mainly because the compositions have a short setting time, low water resistance, and low strength characteristics. As a rule, the softening factor for such compositions does not exceed 0.5, and the compressive strength is 4-6 MPa

scholarly journals Adhesion abilities and biosorption of Cd and Mg by microorganisms - first step for eco-friendly beneficiation of phosphate ore

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Hakim Rabia ◽  
Malek Ould Hamou ◽  
Katarzyna Kasperkiewicz ◽  
Jolanta Brożek ◽  
Maria Augustyniak
Keyword(s):  
Raw Materials ◽  
Rhodococcus Erythropolis ◽  
Phosphate Ore ◽  
Chemical Reagents ◽  
Natural Mixture ◽  
Microbial Strains ◽  
Ph Range ◽  
Favorable Conditions ◽  
Unique Composition ◽  
Apatite Surface

Abstract Chemical reagents used in traditional mineral processing can be toxic and hazardous for the environment. Therefore, the use of biotechnological methods is becoming increasingly important. Great hopes are being placed in the use of microorganisms for bio-beneficiation of raw materials. However, assessment of adhesion abilities of bacteria onto minerals surface as well as biosorption of metals are essential steps before designing final process of each ore beneficiation. The main aim of this work was an investigation of biosorption of Cd and Mg, as well as adhesion abilities of five microorganism species with minerals included in the natural mixture of phosphate ore form Djebel Onk, Algeria. The ore, due to its unique composition, created conditions for adhesion of all five tested microbial strains onto apatite surface during incubation at pH 3. Moreover, Rhodococcus erythropolis CD 130, Pseudomonas fluorescens and Escherichia coli adhered distinctly onto apatite surface during incubation at pH 7. Incubation lasting 20 min at pH 4-6 created the most favorable conditions for biosorption of metals by B. subtilis and adhesion of cells. In case of C. albicans, biosorption of metals as well as adhesion of cells onto the mineral surface were more effective after longer time and in a wider pH range.

scholarly journals Organizational, technical and economic fundamentals of waste management and monitoring

2020 ◽  
Vol 164 ◽  
pp. 08031
Author(s):  
Evgeniy Velichko ◽  
Edward Tshovrebov ◽  
Ural Niyazgulov
Keyword(s):  
Legal Status ◽  
Raw Materials ◽  
Economic Regulation ◽  
Economic Activities ◽  
Renewable Raw Materials ◽  
Secondary Resources ◽  
Secondary Raw Materials ◽  
Production And Consumption ◽  
Level Of Use ◽  
Goals And Objectives

The article deals with issues of monitoring, planning, organizational and technical support, economic regulation and improving the efficiency of the infrastructure for processing, recycling and disposal of waste, resource conservation and management of secondary resources, their use as secondary raw materials for production, services, work and power generation. The Russian Federation has significant potential for economic growth due to the efficient use of secondary resources from billions of tons of generated production and consumption waste annually. These ecologically unsafe anthropogenic objects can be characterized as a source of valuable renewable raw materials, material and fuel and energy resources. However, the scale and level of use of various types of secondary resources are characterized by considerable unevenness and depend on the demand for secondary raw materials, the resource value of the waste, the environmental situation arising from treating them as environmental polluters, on the real economic conditions that determine the profitability of each specific type. economic activities that use secondary resources for the manufacture of products, works, services, energy production. The methods of monitoring the industry for the treatment, disposal and disposal of waste are: information-analytical, information-statistical, sociological, geo-information. The legal status of the monitoring system of the industry for the treatment, disposal and disposal of waste is determined by the limitations of its functionality within the framework of the goals and objectives facing it.

Preparation of Alternative Hydraulic Binder Based on Secondary Raw Materials

2014 ◽  
Vol 1000 ◽  
pp. 12-15
Author(s):  
Jiří Švec ◽  
Tomáš Opravil ◽  
Jiří Másilko
Keyword(s):  
Portland Cement ◽  
Raw Materials ◽  
Construction Materials ◽  
High Volume ◽  
Point Of View ◽  
Hydraulic Lime ◽  
Combustion Gases ◽  
Secondary Raw Materials ◽  
Hydraulic Binder ◽  
Massive Scale

Reusing and recycling of secondary raw materials from high-volume industrial productions (especially form construction materials and binders fabrications) is very important way of conserving environment and it is also interesting from the economical point of view. The production of common hydraulic binders, especially Portland cement, burdens the environment with considerable amount of combustion gases and consumes energy in massive scale. Alternative (low – energy) binder can be used as Portland cement substitution in applications with lower mechanical properties requirements. Mined limestone wash sediments contain large amount of clay components, but there is also indispensable share of fine calcite. This composition makes these sediments a promising material for the preparation of hydraulic binders as Roman cement or hydraulic lime.

STATE AND PROSPECTS OF PROCESSING OF SECONDARY RAW MATERIALS OF WINE-MAKING IN UKRAINE

2021 ◽  
Vol 15 (1) ◽  
Author(s):  
L. Osipova ◽  
O. Radionova ◽  
L. Tkachenko ◽  
T. Abramova
Keyword(s):  
Agricultural Land ◽  
Animal Feed ◽  
Raw Materials ◽  
Acid Soil ◽  
Biologically Active ◽  
Limiting Factor ◽  
Wine Making ◽  
Secondary Raw Materials ◽  
Use Of Resources ◽  
Wide Range

The analysis of the current state of processing of secondary raw materials of wine-making in Ukraine is given. It is proved that the latter is a rich source of biologically active compounds, including phenolic ones, which makes it possible to use it for the production of a wide range of products (raccoon, polyphenol extracts, tartaric acid, beverages, fertilizers, grape oil, cake, vitamin D, animal feed, food powder, abrasives) with high consumer value for various industries: food, pharmaceutical, perfume and cosmetics, chemical, feed, etc. In the light of modern research, the role of phenolic compounds as essential nutrition factors that cannot remain out of the field of view of physiologists, pharmacologists, and food hygiene specialists is shown. However, currently in Ukraine there are no specialized enterprises for complex processing of secondary raw materials of winemaking; traditional technologies are not effective from a technological, economic and environmental point of view, which indicates not rational use of resources and loss of material resources; there are no systematic studies on physical and chemical, microbiological, Toxicological composition in order to determine the optimal direction of its use. A limiting factor is also the lack of comparative analysis of innovative domestic and foreign technologies for processing secondary raw materials of winemaking. In the vast majority of cases, in particular, combs and pomace are taken out of control to agricultural land without special treatment, which leads to acid soil erosion and pollution of the environment with metabolites of micromycetes, increasing one of the global problems of mankind-environmental. At the present stage of technological development, there are a number of innovative developments in the field of processing secondary raw materials, in particular grape pomace, in order to obtain biologically active additives, the limiting factor for the introduction of which is the lack of domestic and expensive imported equipment. A promising way to solve the existing problems is to create a mechanism that will unite the interests of wineries (producers of secondary raw materials of winemaking), processing enterprises (producers of products from secondary raw materials of winemaking), scientists and potential consumers of innovative products. Consolidation of the above-mentioned institutions and enterprises is possible by creating clusters for the development and implementation of innovative technologies and equipment

ISOLATION OF PECTIN SUBSTANCES FROM THE PODS OF LEGUMINOUS CULTURES

2019 ◽  
Author(s):  
М.М. ПИВЕНЬ ◽  
Л.Я. РОДИОНОВА ◽  
А.В. СТЕПОВОЙ ◽  
С.М. ГОРЛОВ
Keyword(s):  
Total Mass ◽  
Raw Materials ◽  
Temperature Treatment ◽  
Secondary Raw Materials ◽  
Leguminous Crops ◽  
Pectin Substances

Исследованы створки зернобобовых культур с целью использования их в качестве источника пектиновых веществ (ПВ). Качественные показатели створок зернобобовых культур гороха и нута составили, % содержания: белка 5 и 15; жиров 1,5 и 1,8; клетчатки 46 и 40 соответственно. Содержание растворимого пектина в створках обеих культур не достигает 0,5%: 0,43 (горох) и 0,47 (нут). Количество протопектина в створках гороха и нута от общей массы составило около 95%, что позволяет отнести эти пектины к высокоэтерифицированным. Установлена необходимость предварительной температурной обработки створок плодов зернобобовых культур для максимального сохранения ПВ в сырье в процессе хранения. Потери ПВ обработанных створок зернобобовых составили 5–10% в процессе хранения 7 мес. Необработанные створки зернобобовых в течение того же срока хранения потеряли 30–35% ПВ. Установлена величина гидромодуля 1 : 10 при проведении режимов гидролиза-экстрагирования. Определены размеры частиц (3–4 мм) при измельчении створок зернобобовых культур для проведения гидролиза-экстрагирования. На основании полученных данных сделан вывод о перспективе использования вторичного сырья зернобобовых культур как источника пектиновых веществ. The secondary raw materials of leguminous crops for the purpose of their use as a source of pectin substances (PS) are investigated. Qualitative indicators of the pods of leguminous cultures of peas and chickpeas were, % of the content: protein 5 and 15; fats 1,5 and 1,8; fibers 46 and 40, respectively. The content of soluble pectin in the pods of both cultures does not reach 0,5%: 0,43 (peas) and 0,47 (chickpeas). The amount of protopectin in the pea and chickpea pods from the total mass was about 95%, which makes it possible to classify these pectins as highly esterified. The necessity of pre temperature treatment of pods of leguminous crops for maximum preservation of PS in raw materials during storage is established. Losses of treated pods of leguminous were 5–10% during storage for 7 months. Untreated pods of legumes during the same period of storage lost 30–35% of PS. The value of the hydraulic module 1 : 10 during the hydrolysis extraction regimes was established. The sizes of particles (3–4 mm) at grinding of pods of leguminous cultures for carrying out hydrolysis extraction are defined. On the basis of the obtained data the conclusion is drawn on the prospect of use of secondary raw materials of leguminous cultures as source of pectin substances.

Adhesives for the Installation of Cast Basalt Elements on Metal and Comparison of Properties when Using Different Types of Fillers

2021 ◽  
Vol 898 ◽  
pp. 35-41
Author(s):  
Jakub Hodul ◽  
Tomáš Žlebek ◽  
Lenka Mészárosová ◽  
Aleš Jakubík ◽  
Rostislav Drochytka
Keyword(s):  
Construction Industry ◽  
Raw Materials ◽  
Physical And Mechanical Properties ◽  
Mineral Admixtures ◽  
Maximum Efficiency ◽  
Organic Additives ◽  
Metal Base ◽  
Secondary Raw Materials ◽  
Ecological Benefit ◽  
Different Types

The polymeric adhesives for the installation of basalt elements on a metal base are designed primarily for environments with increased chemical and mechanical stress. They are composed of polymer resins (epoxy, polyurethane) as binders, as well as organic additives and mineral admixtures that mainly fulfill the function of filler. In all sectors of today's construction industry, maximum efficiency in the production of materials is required for sustainability purposes, which, however, must never be at the expense of the quality or the required performance. Due to these requirements, great emphasis is placed on the maximum use of secondary raw materials. Talc is used as the primary filler for polymer adhesives. Sawdust, tire rubber, and fly ash are used as secondary raw materials. The use of these in building supplies can positively affect some physical and mechanical properties of polymeric adhesives. Also, the use of secondary raw materials has the above-mentioned ecological benefit. Basic properties, such as bulk density and adhesion to both metallic and basalt elements, were monitored. The details of the cohesion of the adhesive with the bonded material, as well as the distribution of secondary raw materials in the polymer matrix, were assessed microscopically.

scholarly journals Characteristic of materials for the 3D printed building constructions by additive printing

2018 ◽  
Vol 222 ◽  
pp. 01013 ◽  
Author(s):  
Katarzyna Pacewicz ◽  
Anna Sobotka ◽  
Łukasz Gołek
Keyword(s):  
Building Materials ◽  
Raw Materials ◽  
New Technology ◽  
Setting Time ◽  
Three Dimensional ◽  
Construction Site ◽  
Printing Technology ◽  
Three Dimensional Printing ◽  
Materials Used ◽  
Dimensional Printing

Three dimensional printing is a promising new technology to erect construction objects. Around the world in every moment a new prototypes constructions are made by using this method. Three dimensional printing is taken into account as technology which can be used to print constructions in automated way on the Moon or Mars. The raw materials, which can be used with three dimensional printing have to fulfil basic requirements for those which are used in construction. That means that components of printing mortars are made from ingredients easily accessible in area nearby construction site and can be reusable. The cost of printing building objects due to that requirements is comparable to costs of traditional building, which are currently available. However additive techniques of printing needs a dedicated mortars for printer supplying. Characteristic for such mortars is: setting time, compressive strength, followability in the printing system, shape stability of every printed layer, controlling the hydration rate to ensure bonding with the subsequent layer, reusable capabilities, easily accessible raw materials, cost of such mixtures shouldn’t be too high in order to keep 3D printing competitive for traditional ways of building, mortar components should be recyclable and printing process should not influence negatively on an environment and people. All properties of printing mortars are determined by the device for additive application method. In this paper review of available materials used for three dimensional printing technology at construction site is presented. Presented materials were analysed in terms of requirements for building materials technology. Due to the lack of detailed information’s in available literature, regarding to the properties of raw materials, the results of this analysis may be used in the designing of new concrete mixtures for the use in three-dimensional printing technology for construction.

Particulars of Magnetic Control of Iron Impurities in Fine-Grain Media — Secondary raw Materials (Ash Wastes)

2014 ◽  
Vol 71 (5-6) ◽  
pp. 213-216 ◽  
Author(s):  
A. A. Sandulyak ◽  
V. A. Ershova ◽  
A. V. Sandulyak ◽  
E. P. Kurenkov ◽  
D. A. Sandulyak
Keyword(s):  
Raw Materials ◽  
Magnetic Control ◽  
Secondary Raw Materials ◽  
Fine Grain
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