The compaction of waterproof and wear-resistant coal logs using polyvinyl alcohol as binder for transporting in hydraulic pipeline system

ABSTRACTIn order to compact coal logs which could be transported smoothly in the hydraulic pipeline, the polyvinyl alcohol was used as the binder and mixed with anthracite, bituminous coal and lignite, respectively, to compact coal logs. The performances of coal logs were evaluated by the waterproof test, wear test and compressive strength test. These results indicated that polyvinyl alcohol was able to enhance the structure of coal logs and improve the water resistance, wear resistance. The coal logs made of anthracite had the best performance, followed by those made of bituminous coal and lignite. Higher binder-addition proportion also resulted in better performances of coal logs. Nevertheless, there were minimum added proportions of polyvinyl alcohol for different qualities of coals. The minimum added proportions were 3%, 8% and 15%, respectively, for anthracite, bituminous coal, and lignite.