Full-fraction dry method separation clean technology and method for coal

Abstract

The invention discloses a full-fraction dry method separation clean technology and method for coal. The technology includes the steps that raw coal to be sorted is screened, crushed and dried and then enters a compound dry method separation machine to obtain rough clean coal and tailings; the rough clean coal is screened through classification screens to obtain products of three fractions; the products of three fractions enter a dry method dense medium separation machine, a vibration dense medium fluidized bed separation machine and a dry method electric separation machine / dry magnetic separator respectively for separation of clean coal and middlings; and after medium solids brought out by the products are removed through a sculping screen, part of the medium solids enter the magnetic separator for removing of non-magnetic substances, then obtained magnetic concentrate flows back to the separator, and the other part of the medium solids are directly and cyclically used. The system comprises a raw coal preparing and drying part, a separating part and a medium purifying circulation and dense control part. According to the full-fraction dry method separation clean technology and method for coal, synchronous efficient separation on coal with large, medium and small granularities can be achieved, and the problems that in a current dry method coal separation field, graded products are fewer, the quality of clean coal is poor, the medium utilization rate is low, and dust is excessively discharged are solved.

Description

technical field [0001] The present invention relates to the field of coal dry separation, in particular to a coal dry separation process and system, in particular to a dry coal separation equipment-based separation clean process and system for selecting coal in full particle size. Background technique [0002] Coal is the main energy source in my country, accounting for more than 60% of the primary energy production and consumption structure, and plays an important supporting role in the rapid development of my country's economy. At present, most of the raw coal in our country is directly burned without clean sorting and processing, causing very serious environmental pollution and waste of resources. Coal preparation is the basis of clean coal utilization technology and one of the key technologies to achieve energy saving and emission reduction. For a long time, the theory and method of coal wet separation have been the basis for the development of leading coal preparation ...

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Problems solved by technology

[0004] Purpose of the invention: The purpose of the present invention is to provide a dry coal preparation process and system with comprehensive functions, easy operation, stable operation, environmental protection and high efficiency, so as to solve the problem that coal cannot be efficiently sorted in full size in the existing dry coal preparation technology. question

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