Air and heavy medium dry coal preparation process

Abstract

The invention provides an air and heavy medium dry coal preparation process. Gangue is separated from raw coal through dynamic air and a heavy medium, and cleaned coal is prepared. The process comprises the following steps of: crushing and sieving the raw coal twice; conveying the sieved block coal into a separator; introducing the dynamic air and the heavy medium into the separator for separation; and removing the medium to obtain the cleaned coal and the gangue, and performing environment-friendly treatment on tailings and the discharged air. The dry coal preparation process employing the dynamic air and the heavy medium replaces wet coal preparation, can well solve the problem of coal separation in a water-deficient area, and saves water sources; the system is simple, and a complicated coal slime water treatment system in wet coal preparation is saved; meanwhile, coal slime water pollution is avoided, the quantity of equipment is small, power consumption is low, energy is saved, environment is protected, and the efficiency of a coal preparation process flow is effectively improved.

Description

technical field [0001] The invention relates to the technical field of coal preparation, and more specifically, relates to a technology for coal preparation using power air and dense medium dry method. Background technique [0002] At present, the known high-efficiency coal preparation technology basically adopts wet separation technology, that is, in the coal preparation process, water must be used as the medium to carry out the separation process of minerals and gangue, so a lot of coal slime water has to be added to the system. The process of processing makes the process complicated, which greatly increases the project investment and production costs, as well as the difficulty of management and operation, and wastes water resources, which has a huge impact on the environment, especially in water-deficient areas and low-deterioration areas. The separation and processing of coal types makes it difficult to carry out the coal preparation process. [0003] Therefore, it is n...

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Problems solved by technology

[0002] At present, the known high-efficiency coal preparation technology basically uses wet separation technology, that is, in the coal preparation process, water must be used as a medium to separate minerals and gangue, so a lot of coal slime water has to be added to the system. The process of processing makes the process complicated, which greatly increases the project investment and production costs, as well as the difficulty of management and operation, and wastes water resources, which has a huge impact on the environment, especially in water-deficient areas and low-deterioration areas. The separation and processing of coal types makes it difficult to carry out the coal preparation process

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