Study and application of the key technologies for coal washing with complete recovery of coal slime

For realizing complete recovery of coal slime, a mathematic prediction model is developed based on analysis of the properties of the coal produced in west Mongolia region for exploration of the raw coal that is amenable to the washing process for complete recovery of coal slime, as well as the quality of the cleaned saleable product. The technical scheme of “reduction of generation of slime at source, recovery of slime by washing process and upgrading of slime at finally stage” is proposed. The core techniques tackled for the scheme involve cleaning of coarse coal using intelligent dry cleaning machine, in-depth removal of fines from small coal, dewatering and recovery of coarse slime, dewatering and upgrading of fine slime, crushing of cake product of filter press and homogeneous blending of slime. The proposed washing scheme is put on a demonstration at Tangjiahui Coal Preparation Plant, breaking the technical bottleneck in realization of complete recovery of coal slime.