保德选煤厂南区降低介耗的措施

在分析保德选煤厂南区介质回收流程的基础上,通过严把介质质量关,改变磁铁矿粉添加方式,提高磁选机的磁选效率,保证脱介水水质合格,确保选前作业稳定有效,降低介质管理损失等措施对选煤厂进行了改造。改造完成后,选煤厂介质磁性物平均质量分数由2012年5月的88.25%提高至7月的92.80%,0.074mm过网率由75.43%提高至90.88%,介质质量明显改善;提高了磁选机回收效率,降低了介质损失;增强了合格悬浮液的透筛能力,增加了有效筛分面积,满足了脱介要求;两段喷水方式达到了回收介质的目的;有效提高了选前脱泥效果。最后对选煤厂经济效益进行了分析,结果表明:保德选煤厂南区块煤、末煤、矸石系统每月介耗为0.24,0.44,0.50kg/t,分别比神东煤炭集团洗选中心考核指标节省介质0.16,0.56,0.30kg/t,选煤厂每月节省介质328t,节省介质费用24.27万元。 Based on the analysis of dense medium recycling process in southern direct of Baode coal preparation plant,transform the process systems through controlling the quality of dense medium and water for sculping screen, changing addition way of magnetic powder,improving the separation efficiency of magnetic separator,ensuring operation efficiency before separation,reducing management loss of medium. After transformation,the average mass fraction is improved from 88.25 percent in May to 92.80 percent in July,the particle size less than 0.074 mm is improved from 75.43 percent to 90.88 percent. The dense medium quality, recovery efficiency of magnetic separator,effective sieving area, penetrability of qualified suspension are improved, while the medium loss is decreased. Two-stage jetting modes get better recovery effect. The desliming efficiency before separation is improved. The results show that,the medium consumptions of lump coal separation system,fine coal separation system and gangue rewash system are 0.24,0.44,0.50 kg/ t,respectively 0.16,0.56,0.30 kg/ t less than perform index,monthly save dense medium 328 t,which cost 2.427×10 5 yuan