Influence of raw coal properties on jig working parameters

CHEN Jianping; WANG Min; MA Tiantian; GE Haibo; ZHANG Weijun; XU Wenbo

doi:10.13226/j.issn.1006-6772.2014.05.015

Abstract：The problems with the jigging process were that,the raw coal can?t be separated effectively,separation precision and recovery ef-ficiency decreased markedly,the quality of clean coal was unstable and its yield was low. Conducted screen analysis and small size slurry float-and-sink analysis.The results show that,the primary slime content is 7.30%,the middlings content is 20.17%,so the raw coal is dif-ficult to separate.Analyze the influence of raw coal size,moisture,gangue content,emissions of elevator on jig working parameters.When the lump coal is less,the separation capacity of jig should be reduced to a minimum,meanwhile,reduce the air volume and emissions,increase the frequency.When the lump coal is large,the water content,horizontal kinematic velocity of bed and middlings discharging should be in-creased,the air volume should be decreased.When the moisture of raw coal is high,the feeding coal should be increased by 8% to 15%.If the gangue content increased,lowering the height of first-stage bed and increasing the screening efficiency of first-stage lighten the han-ding capacity of middlings treating process.If the lump coal in bucket type elevator were large,the thickness of second-stage bed should be increased,the discharging and air emission of second-stage should be decreased. If there were larger gangue in bucket type elevator,the feeding coal and the second-stage height of the second-stage should be decreased,gangue discharging and air volume should be increased.