EXTRACTION OF LOW RANK COAL USING PULP WASTE LIQUOR FOR CWM PREPARATION

摘要

Addition of HA from Neimenggu lignite and lignin from PWL can lower viscosity of CWM markedly. Combined use of HA and lignin exhibited more dispersing effect than HA and lignin solely. High coal loading CWM of 69wt% can be produced by lignite-PWL extraction liquor diluted with water by a high diluted multiple. In this process, the high pH of PWL is utilized to extract lignite and the extraction liquor can be utilized without any transaction, so the burthen to transact of waste water will be mitigated consumedly and the produce cost of CWM will reduce markedly.