The coal slime water treatment system renovated at Hecaogou Coal Company′s Coal Washery for improving washing efficiency and upgrading of products

The sieve bend originally used for dewatering and desliming of overflow of tectered-bed separator was poor in efficiency, and the flotation concentrate was found to contain a noticeable amount of fine slime. To address this issue, renovation work is made by the washery through shifting to the use of electromagnetic screen for desliming of overflow of teered-bed separator, the use of spiral separator for scavenging of the separator′s tailings product, and the addition of a flotation system consisting of a roughing stage and a cleaning stage. It is predicated that the renovation my lead to noticeable improvement of coarse slime cleaning result and flotation indices, a rise of yield of total clean coal product by 1.98 percentage points and a favorable economic result.