矸石稀介无动力磁选外排技术研究

Research on undrained magnetic separation technology in waste medium

针对乌兰木伦选煤厂高灰细煤泥回掺混煤,对混煤质量造成二次污染,增加选煤厂药耗,降低分选精度等问题,通过对稀介磁选工艺进行分析优化,研究并应用了矸石稀介无动力磁选外排技术,并对技术应用效果进行分析。矸石稀介无动力磁选外排技术可将矸石泥从煤泥产品中及时分离,缩短了矸石泥在煤泥水系统中停留时间,细煤泥灰分降低1%,有效降低煤泥水系统的药剂消耗,强化了煤泥水沉降效果。改造后混煤发热量因降低灰分而提高54 k J/kg,增加经济效益520万元;吨煤阳离子消耗降低10 g,吨煤阴离子消耗降低3 g,节省药剂费用16. 6万元。

Aiming at the problems of high ash fine slime back blending mixed coal caused to secondary pollution to blended coal quality,increasing drug consumption and reducing separation accuracy in Ulanmulun coal preparation plant,dilute medium magnetic separation technology was analysed. Undrained magnetic separation technology in waste medium was studied and applied,and application effect of technology was anaylsed.The waste slurry can be separated from coal slurry products in time by undrained magnetic separation technology in waste medium,which shortens the residence time of waste slurry in coal slurry water system,reduces the ash content of fine coal slurry by 1%,effectively reduces reagents consumption,and strengthens the sedimentation effect of coal slurry water.After modification,the calorific value of blended coal increases by 54 k J/kg due to the reduction of ash content,and the economic benefit increases by 5.2 million yuan.The cation and anion consumption per ton of coal decrease by 10 g and 3 g,respectively,and the reagent cost is saved by 166 thousand yuan.