Preparation and Properties of New Packing Material Contained Red Mud

Abstract

Abstract: In order to make up for the shortage of most packing materials in the process of coal mining due to the high cost of packing materials, and effectively solve the current situation that a large number of solid waste red mud produced in the aluminum industry can not be treated, a new packing material contained red mud utilized in gob-side entry retaining technique was developed through the effective mixing of additives and main raw materials. The performance indexes including compressive strength, setting time, fluidity and stability were studied. The results indicate that the new packing material contained red mud has good single slurry fluidity, and its setting time is more than 6 h. The amount of red mud in the material can be adjusted, and its mass fraction ranges from 0% to 50%. The molding material has early strength and quick hardening, the initial setting time is only 25 min. The compressive strength in 1 d, 3 d, 7 d of packing material with optimum proportion of red mud and additives reaches 8.4 MPa, 10.3 MPa and 12.3 MPa, respectively. After the packing material coated with plastic film impregnates for 14 d, the pH value of leaching liquor keeps at 6, the alkaline substances in the red mud are solidified well, and the probability of pollution is low.

Key words: packing material, red mud, fluidity, compressive strength, setting time

CLC Number:

X705

WANG Xudong, LI Weibin, ZHAO Jun, ZUO Nannan, SHI Zhuqing, WANG Pengcheng, WANG Weiwei, GAO Weijie. Preparation and Properties of New Packing Material Contained Red Mud[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(4): 1280-1285.

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