DOI 10.21440/2307-2091-2016-4-54-56

Development of coal deposits with the application of upgraded surface miner pdf

A. Yu. Cheban, N. P. Khrunina, S. A. Shemyakin

Technologies of excavation of dense and half-rocks with application of surface miners are being developed, which are used during development of deposits of coal, bauxite, phosphates, limestones, marble, chalky clay and other mineral resources. During development of coal deposits surface miners allow to withdraw from drilling and blasting operations, provide an increase of coefficient of extracting the mineral reserves from earth depths and the decrease of ash content of the coal due to its
selective mining. An important problem is the presence of a big amount of small fractions in extracted coal, which predetermines the losses of mineral deposits during loading, transportation and storage, it also lowers the quality and market value of the coal. This article proposes the technology of layer-wise open pit development of coal fields with application of modernized surface miner, additionally equipped with transport-assortment device. Extracted rock mass is supplied to the transport assortment device and is divided on its surface into sized coal and coal slack. Efficiency of assortment process is increased due to the operation of vibrator that impacts its sizing grill that is installed in elastic supports. Sized coal is supplied to the dumping truck through the discharge boom of surface miner, whereas the coal slack is transferred into sealed bins of special vehicle through pneumatic conveyor system. The proposed technical-process design allows carrying out the assortment of coal directly where it is extracted, as a result of which necessity in additional coal transferring is eliminated. Ecological situation is improved since the blowing out of coal slack in the coal extraction location and during its transportation to the transfer point is almost entirely eliminated.

Keywords: surface miner; coal slack; bracketing; assortment; dumptruck; sealed bin; pneumatic transportation system.

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