Transformation of preparing workshop of Zhangjiamao coal preparation plant

Affected by high ash of raw coal in Zhangjiamao coal preparation plant,the products quality decreased obviously. In order to resolve the problem,the raw coal classification size was changed from 25 mm to 13 mm. The change lowed the screening efficiency,it also made the screen aperture jammed easily. The original banana screens were replaced by two flip flow screens. The yield of medium- sized coal increased from 14. 16% to 24. 29%,the yield of mixed slack coal decreased from 59. 17% to 48. 24%. The revenue of plant increased by RMB 2. 079 × 107 per year. When used the flip flow screens,the feed quantity and mismatch content reduced by 13. 90%,and the slime content reduced from 8. 69% to 2. 17%,the yield of mixed slack coal increased by 3. 44%.