Research and application of green filling mining technology for coal mine flotation tailing
In view of the problem that the stacking amount of coal gangue in Huoshaopu Coal Mine had exceeded the design amount,through the middling coal screening test,slime screening test,beneficiation test and the test of strength measurement of filling materials,the green filling mining technology of coal mine flotation tailings was studied and applied in Huoshaopu Coal Mine.The results showed that the grinding fineness,water glass dosage,collector type and dosage had a significant impact on the tailings yield and ash content.The optimal condition was grinding fineness to be 85% product with size≤200 mesh,water glass dosage of 800 g/t,and LM-1 collector selected at a dosage of 200 g/t.In addition,the ash content indicators of the products obtained from both open circuit flotation test and closed circuit flotation test could meet the standard requirements.The on-site application effect of green filling technology for flotation tailings showed that the#230708 filling area consumed a total of 124 000 m3 of coal gangue,effectively alleviating the pressure of coal gangue storage of the mine.
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