scholarly journals Studies of the Possibility of Using Coal Mining Waste in Concrete for Mine Construction

2020 ◽  
Vol 174 ◽  
pp. 01012
Author(s):  
Natalya Gilyazidinova ◽  
Vladimir Duvarov ◽  
Akparali Mamytov
Keyword(s):  
Coal Mining ◽  
Liquid Glass ◽  
Setting Time ◽  
Fine Fraction ◽  
Mining Waste ◽  
Coal Waste ◽  
Technological Parameters ◽  
Optimum Quantity ◽  
Coal Wastes

The article discusses the possibility of using coal waste for the preparation of mine concrete. As a result of the research, scientific and prac- tical results were obtained. It has been experimentally proved that when a small fraction of coal, which is a waste of coal mining, is added to mine concrete, the strength of concrete decreases, but with a certain ratio of this strength it is sufficient to ensure the required properties. A series of experi- ments was carried out with the addition of liquid glass to the concrete to control the setting time of the mixture. The properties of coal wastes were determined and the possibility of their use in mine concrete was investigated. It has been established that the introduction of a fine fraction of coal in the optimum quantity into the composition of mine concrete is possible without reducing technological parameters.

scholarly journals Technogenic carbonaceous objects of the Chervonohrad mining and industrial district and some technical solutions for their using

2019 ◽  
Vol 4 (181) ◽  
pp. 45-65
Author(s):  
Dmytro BRYK ◽  
Oleg GVOZDEVYCH ◽  
Lesya KULCHYTSKA-ZHYHAYLO ◽  
Myroslav PODOLSKYY
Keyword(s):  
Coal Mining ◽  
Coal Ash ◽  
Energy Utilization ◽  
Coal Waste ◽  
Coal Production ◽  
Industrial District ◽  
Waste Dumps ◽  
Wide Range ◽  
Coal Wastes ◽  
The Impact

Ukraine has significant coal resources. Chervonohrad Mining and Industrial District is the main coal complex in the west of Ukraine. In recent years, the average annual coal production in the mines of Chervonohrad Mining and Industrial District has amounted to 1.5 bn t, coal ash varies over a wide range of 25 to 53 %, average coal ash content of about 40 %. Coal mining has produced millions of tons of coal waste every year. Concentration of technogeneous coal objects (mines, mining infrastructure, coal-mining waste dumps and wastes of coal enrichment) in a relatively small area has caused environmental degradation. Therefore, technological and environmental aspects of carbon-containing technogenic objects are particularly important and actual. Coal-waste dumps in the territory of Chervonohrad Mining and Industrial District are characterized in detail. The dumps cover different areas – from 9–10 to 29–30 ha, the height of the dumps reaches 62 m at the mostly heights of 25–40 m. The total waste deposit in the dumps of existing mines has a volume of more than 20 million m3. The coal wastes from Mezhyrichanskaya mine coal-waste dump was investigated to determine the suitability for thermochemical processing. Technical characteristics of taken coal-waster samples is presented. The technogenic carbonaceous objects and the impact to the environment are evaluated. The developed and patented technical and technological solutions for the technogenic carbonaceous objects using are considered. It is shown that the concept of industrial development of coal wastes dumps is based on two aspects – extraction of valuable mineral components and energy utilization of carbonaceous wastes of coal production. Its patented as Patents of Ukraine technological schemes for terrestrial process in of solid carbonaceous raw material from dumps and sludges with the production of coal tar and synthesis gas CO + H2 are presented, as well as the scheme of a system for utilization of heat from coal dump. Recommendations for the implementation of innovative technologies are based on the results of the laboratory research. The purpose of the resolution is to obtain valuable components and energy from coal wasters while improving the environment.

scholarly journals The Behaviour of Siderite Rocks in an Experimental Imitation of Pyrometamorphic Processes in Coal-Waste Fires: Upper and Lower Silesian Case, Poland

Minerals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 586
Author(s):  
Łukasz Kruszewski ◽  
Justyna Ciesielczuk
Keyword(s):  
Coal Mining ◽  
Mining Waste ◽  
Coal Waste ◽  
X Ray ◽  
Self Heating ◽  
Thermal Chamber

Little is known of the influence of fluxes on the nature and the intensity of burning in coal-waste heaps. To gain some insight, two siderite samples, one each from coal-mining waste heaps in Upper- and Lower Silesian Coal Basins (Poland), were heated under identical conditions in a thermal chamber coupled to a powder X-ray diffractometer. Differences in the behaviour of siderite phase and the products of its decomposition, mainly magnetite, wüstite, and olivine, are discussed. The waste heaps sampled underwent self-heating and self-ignition catalysed by fluxes. Though the samples are unlikely to be truly representative of the Silesian basins, the heterogeneous behaviour they displayed on heating merits description and explanation, as siderite is an important widely known flux in pyrometamorphic processes.

Geotechnical aspects of coal waste embankments

1976 ◽  
Vol 13 (1) ◽  
pp. 27-39 ◽  
Author(s):  
Igor Holubec
Keyword(s):  
Engineering Design ◽  
Coal Mining ◽  
Mining Industry ◽  
Coal Waste ◽  
Coal Mining Industry ◽  
Coal Wastes ◽  
The Common ◽  
Geotechnical Problems

The expanding consumption of energy has created new demands for coal and increasing activity in the coal mining industry. However, the mining of coal is accompanied by coal wastes which are dumped in the form of coal waste embankments. The present concern for safety and the environment requires an analysis of the geotechnical problems associated with the construction of these embankments to assure acceptable engineering design. This paper discusses the properties of the coal wastes and the behaviour of coal waste embankments which differ from the common earth embankments that the geotechnical engineer has to deal with.

scholarly journals Study of the strength dependence of concrete for mine construction on the content of coal mining waste in it

2021 ◽  
Vol 315 ◽  
pp. 02006
Author(s):  
Alexandr Liskovec ◽  
Natalya Gilyazidinova ◽  
Vladimir Duvarov ◽  
Victor Tacienko
Keyword(s):  
Coal Mining ◽  
Coal Dust ◽  
Fine Fraction ◽  
Physical And Mechanical Properties ◽  
Strength Properties ◽  
Mining Waste ◽  
Dust Particles ◽  
Strength Performance ◽  
Quantitative Content ◽  
Strength Dependence

The possibility of using coal mining waste in mine concrete mixing is considered in the article. As a result of the research, scientific and practical results have been obtained that make it possible to evaluate the strength properties of mine concrete, depending on the content of coal dust particles - the waste of mining - in it. It has been experimentally proven that when a fine fraction of coal is added to mine concrete, the strength of concrete decreases at a certain ratio, but this strength is sufficient to ensure the required properties. As a result of the experiments, samples of concrete for mine construction were manufactured, into which a fine fraction of coal - coal dust - was added in various ratios. A series of mine concrete tests was carried out to determine its physical and mechanical properties; the optimal composition was determined, which provides process and strength performance of the mixture. The conclusions have been drawn about the quantitative content of a fine fraction of coal in mine concrete, which make it possible to maintain process performance of the mixture and the strength of structures.

Self-burning coal mining residues – an environmental issue or a source of raw materials?

2020 ◽  
Author(s):  
Joana Ribeiro ◽  
Isabel Suárez-Ruiz ◽  
Deolinda Flores
Keyword(s):  
Trace Elements ◽  
Coal Mining ◽  
Raw Materials ◽  
Mining Waste ◽  
The Self ◽  
Waste Materials ◽  
Coal Waste ◽  
Burning Coal ◽  
Critical Raw Materials ◽  
Waste Deposits

<p>The self-burning of coal mining residues disposed at environmental conditions have been described in the literature as a phenomenon occurring worldwide. These coal related fires are of significant concern because of the risks to environment and human health due to the emission of harmful gases and particulate matter to atmosphere. Another concern is the degradation of soils and waters in surrounding areas owing to the mobilization and leaching of hazardous elements. The self-burning of coal mining waste deposits may be a very persistent phenomena over decades. The carbon content (combustible fraction) and chemical composition of coal waste materials (and some physical properties) are the most relevant factors that influence intensity and duration of the self-burning process. The comprehensive characterisation of coal waste deposit materials provide information on the self-burning process and above all useful insights about the propensity to ignition and burning and their environmental impacts. The characterization of coal waste materials can contribute to assess their reuse as a secondary source of critical raw materials and carbon based materials.</p><p>The recycling of these materials, from both burning and non-burning coal waste deposits, is in good agreement with recommendations from European Union (EU) pointing out the need for developing sustainable recovery of mining and industrial wastes to mitigate environmental impacts. The EU identifies 26 critical raw materials including inorganic trace elements and natural graphite as a critical raw materials with extremely high level of external dependence, and strongly recommends the development of measures to increase recycling of by-products and residues. In this framework, research has been dedicated to burning or already burned coal mining waste deposits in Portugal and Spain. Non-burning coal mining waste deposits from the same mining areas have also been investigated. These coal waste deposits, resulted from the discharging of coarse mine refuse from mining exploration. They are very heterogeneous and present variable amounts of coal that is the combustible fraction. The comprehensive characterization of mining waste materials as well as the identification of products formed during combustion reveals the potential environmental impact, principally due to the concentration of volatile organic compounds emitted to atmosphere. The combustion process also causes changes in trace elements’ mode of occurrence with some becoming more easily mobilised for surrounding soils and water systems by percolation or deposition of solid atmospheric particles. On the other hand, the mining waste burned materials reveal an enrichment of some trace elements, including critical raw material; and, the production of graphitic structures, including graphene. Therefore the coal wastes mining deposits are an environmental issue, they can be seen as an alternative secondary source of critical raw materials and carbon based materials.</p>

To the question about the utilization of coal mining waste

2019 ◽  
Vol 5 (10) ◽  
pp. 153-158
Author(s):  
E.I. Khabarova ◽  
◽  
E.S. Zarubina ◽  
Keyword(s):  
Coal Mining ◽  
Mining Waste

Modeling of the Transition Layer in Ceramic Matrix Composites from Coal Wastes and Clay

2020 ◽  
Vol 299 ◽  
pp. 37-42
Author(s):  
O.A. Fomina ◽  
Andrey Yu. Stolboushkin
Keyword(s):  
Transition Layer ◽  
Raw Materials ◽  
Ceramic Matrix Composite ◽  
Ceramic Matrix Composites ◽  
Ceramic Matrix ◽  
Coal Waste ◽  
Matrix Composites ◽  
Carbonaceous Particles ◽  
The Core ◽  
Coal Wastes

A model of the transition layer between the shell and the core of a ceramic matrix composite from coal waste and clay has been developed. The chemical, granulometric and mineral compositions of the beneficiation of carbonaceous mudstones and clay were studied. The technological and ceramic properties of raw materials for the samples manufacturing were determined. The method of manufacturing multilayer ceramic samples from coal waste, clay and their mixture is given. The number of transition layers in the contact zone between the clay shell and the core from coal wastes is determined. The deformation and swelling phenomena of model samples from coal wastes, clay, and their mixtures were revealed at the firing temperature of more than 1000 °C. The formation of a reducing ambient in the center of the sample with insufficient air flow is shown. The influence of the carbonaceous particles amount and the ferrous form iron oxide in the coal wastes on the processes of expansion of multilayer samples during firing has been established.

Test trials of a process to produce briquettes from coal mining waste

2021 ◽  
pp. 93-96
Author(s):  
T. A. Ketegenov ◽  
K. Kamunur ◽  
T. I. Yushina ◽  
S. N. Kalugin
Keyword(s):  
Fine Fraction ◽  
Physical And Mechanical Properties ◽  
Added Value ◽  
Coal Waste ◽  
Chemical Processing ◽  
Ministry Of Education ◽  
Production Wastes ◽  
Grant Support ◽  
National University ◽  
Coal Fines

At the present time, coal production wastes up to 2 % of fine fraction, which has adverse impact on the environment. On the other hand, coal fines can be a feedstock to obtain different products of chemical processing—benzines, oils, briquettes, etc. For this reason, it is necessary to develop dedicated technologies to utilize fine waste in manufacture of products having high added value. The experimental results demonstrate usability of wheat bran as a binder in coal waste briquetting. It is found how the binder and the briquetting conditions influence the physical and mechanical properties and combustion characteristics of coal briquettes. The optimized coal briquetting conditions are: carbonization of feedstock, use of binder in quantity of 25–30 mass%, briquetting pressure of 4 MPa. Thus, the authors have analyzed the influence of the briquetting conditions on the properties of coal briquettes, and have tested the earlier developed approaches to transformation of Oi-Karagai coal fines into a target product of high added value. The authors appreciate participation of A. Karagulanov, fellow of the Al-Farabi Kazakh National University in this study. The work was performed with the grant support of the Ministry of Education and Science RK-A RO 08957618.

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