DOI: 10.18503/1995-2732-2021-19-3-37-43
Abstract
Relevance and purpose of the study. Russia is one of the largest coal producers and exporters; about half of the production is exported, while most of the exported coal is shipped through the seaports. With the increase in the coal production and transportation, the negative load on the environment is growing. An important environmental problem is air pollution with coal dust, which can be in the air for a long time and move over considerable distances. Coal fines are intensively blown out during the coal transportation and storage, leading to losses of the mineral, as well as contamination of territories; in addition, fine fractions in coal reduce its quality and market value. Objective. The research is aimed at offering rationale for a technical and technological solution providing a reduction in dusting during coal mining and handling by removing fine fractions directly during a mining and loading process using a modernized roadheader, as well as reducing the number of special vehicles that accumulate and transport screened fine coal. Results. The paper proposes the design of a modernized roadheader, which ensures the separation of fine coal in the mining process, and the technology of its application. The roadheader is equipped with a scraper conveyor with a classification grid and a dust collection device. The coal chipped off by the milling working tool enters the loading table, from where it is fed to the scraper conveyor by gathering arms, which moves the coal over the classification screen. Fine coal fractions are screened through the screen slots and collected in an accumulator. A vibrator is installed on the classification screen to intensify the process. Coal fines are transported from the accumulator by a pneumatic conveying system to a container installed on the surface of the working platform; containers are exchanged with a special vehicle and delivered to the processing site. Coarse coal fractions are transported by a discharge conveyor to a dump truck. Conclusions. The proposed solution will ensure the removal of fine coal during the mining process, which will improve the quality of coal and reduce the negative impact of mining on the environment. Dusting will be significantly reduced, when loading a dump truck, transporting and reloading coal, entailing decreased losses from blowing and spilling coal. The use of removable containers for accumulating fine coal will reduce the number of special vehicles transporting screened fine coal and increase their productivity.
Keywords
Roadheader, scraper conveyor, classification screen, coal fines, pneumatic conveying system, container, dump truck.
For citation
Cheban A.Yu. Reducing Dust in Mining and Transferring Coal by Improving Mining Equipment. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2021, vol. 19, no. 3, pp. 37–43. https://doi.org/10.18503/1995-2732-2021-19-3-37-43
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