A method for joint mining of coal and associated oil shale

Abstract

The invention provides a method for combined exploitation of coal and its associated oil shales. The method comprises the construction steps that when the coal and its associated oil shales are located in a reasonable exploitation bed separation distance range, coal resources located at the lower portion are firstly exploited, a mine bearing pressure is fully utilized to destroy associated oil shales located in an overlying rock layer and reduce the strength; then, the associated oil shales at the upper portion are exploited later to achieve combined exploitation of coal and its associated oil shales. Therefore, the shortcoming that when oil shales are independently exploited, the oil shale strength is higher and accordingly a coal cutter difficultly break rocks can be overcome. According to the exploitation method, existing infrastructures and sinking and driving engineering can be fully utilized, the roadway tunneling amount can be decreased, investment can be reduced, the costs are low, the phenomenon that the oil shales associated with coal are severely abandoned can be effectively completely eradicated or decreased, the resource utilization rate can be improved, an economic value is huge, and the method has the important practical significance on relieving of conventional energy source supply and demand pressure, energy structure adjustment and energy guaranteeing.

Description

technical field [0001] The patent of the present invention relates to the technical field of mining technology of coal and its associated resources, and specifically relates to a joint mining method of coal and its associated oil shale. Background technique [0002] my country has abundant reserves of oil shale resources, and coal mines in some areas also have associated oil shale resources. With the increasingly prominent contradiction of energy shortage, it is necessary to rationally use existing resources and actively carry out the exploitation and utilization of associated resources. Oil shale is a mineral resource that is very rich in reserves but has not been well utilized. The mining and utilization of oil shale resources associated with coal can replace some conventional oil and gas and relieve my country's energy pressure. For this reason, the country's "13th Five-Year Plan" initially proposed the planning idea of ​​"stabilizing oil, promoting gas, controlling coal...

AI Technical Summary

Problems solved by technology

Since most of the coal mines associated with oil shale in my country only focus on coal as a single resource, coupled with the limitation of investment costs and the strength of oil shale, direct mining of oil shale will make it difficult for shearers to break rocks and reduce the risk of shearers breaking rocks. Therefore, at present, only the coal seam is recovered and the oil shale associated with coal is not exploited in time.

As a result, the oil shale layer is destroyed, which is not conducive to future recovery, resulting in waste and loss of beneficial mineral resources

Even if the oil shale is extracted back and forth in the future, the entire production system must be re-arranged, and it will seriously interfere with the current coal production system. The investment cost, safety risks and management difficulties will be greatly increased, and the difficulty of the recovery process will also increase, which is not conducive to the development of coal mines. sustainable development

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