A preliminary design study was conducted on the process of a 1.2 Mt/a coal preparation plant in Shanxi Province.The selected raw coal ash mass fraction was 19.53%,and the design required the ash mass fraction of clean coal to be 10%and the moisture mass fraction to be less than 12%.Based on the analysis of coal quality data,a reasonable washing process was designed.After carrying out the relevant calculation of the process flow,the yield of clean coal was 46.47%,the ash mass fraction was 9.69%,the yield of flotation clean coal was 25.62%,the ash mass fraction was 9.58%,the yield of middling coal was 18.10%,the ash mass fraction was 26.52%,the yield of gangue was 6.32%,the ash mass fraction was 71.34%,the yield of flotation tail coal was 3.49%,the ash mass fraction was 74.62%,which improved the profits of coal mining enterprises.The process characteristics of the coal preparation plant were elaborated,providing reference for subsequent research and construction.
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