Study and application of the process for recovery of heavy medium separation system′s cleaned coarse slime

The paper presents an outline of the technological processes currently applied for the separation of coarse slime, and points out that for the separation of either sized or unsized coarse slime, the heavy medium separation systems can all wash down to a size of 0.25 mm or even 0.125 mm under normal operating conditions.It is clearly noted that separation and recovery of coarse slime have a direct bearing on the stable operation and economic performance of coal preparation plants.Based on result of analysis of the problems encountered in field operation of the coarse slime separation and recovery processes, as well as structural improvement and optimization of the key process equipment—cyclone and dewatering screen, a combined coarse slime treatment process is proposed.The process features the use of cyclone classifier for intensified sizing and thickening plus the electromagnetic high-frequency vibrating screen for intensified sizing and dewatering as the core process links.Field application of the process has met with tangible result.