Raw coal feeding and screening technique

Abstract

The invention discloses a raw coal feeding and screening technique, and relates to the field of raw coal processing. The raw coal feeding and screening technique comprises the following steps that 1,raw coal feeding is carried out; 2, primary raw coal magnetic screening is carried out; 3, primary raw coal classification is carried out, wherein the raw coal is screened through a first screening device (9) to obtain coarse undersize, gangue contained heavy substances and light substances; 4, primarily crushing is carried out, wherein the gangue contained heavy substances in step 3 is conveyed to a first-stage crusher for crushing through a first-stage conveyor belt device, and the light substances in step 3 is conveyed to a second-stage crusher for crushing through a second-stage conveyor belt device; 5, the magnetic screening and the classification are carried out again; and 6, crushing is carried out again. The raw coal feeding and screening technique has the advantages that in the raw coal treatment technique, gangues can be screened conveniently, labor is saved and labor intensity of workers is reduced; and the raw coal with different particle sizes in the process is subjected to multiple times of iron removing and crushing, and iron impurities in the raw coal are removed more completely, so that the quality of finally crushed raw coal is improved and subsequent fine processing is promoted.

Description

technical field [0001] The invention relates to the field of raw coal processing, in particular to a raw coal feeding and screening process. Background technique [0002] Raw coal refers to the raw coal excavated from the ground or underground after screening and processing to remove gangue, pyrite, etc., including natural coke and low-quality coal, excluding low calorific value coal (such as stone coal, peat, oil shale, etc.) Raw coal can be divided into three categories according to its origin: humic coal, sapropel peat and humic peat; according to its degree of carbonization, it can be divided into peat, lignite, bituminous coal, and anthracite. [0003] Raw coal usually contains gangue and other impurities, and these impurities such as gangue usually need to be sorted out in the raw coal treatment process. The current treatment basically uses manual operations to pick up gangue impurities from the conveyor belt, but because some gangue The volume is large, the quality i...

AI Technical Summary

Problems solved by technology

[0003] Raw coal usually contains gangue and other impurities, and these impurities such as gangue usually need to be sorted out in the raw coal treatment process. The current treatment basically uses manual operations to pick up gangue impurities from the conveyor belt, but because some gangue The volume is large, the quality is large, and the conveyor belt is wide. This processing method is labor-intensive for workers.

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