高压辊磨超细碎对弓长岭磁铁矿石磨矿能耗的影响

Influence on Superfine Crushing by High Pressure Grinding Rolls on Grinding Energy Consumption of Magnetite Ore from Gongchangling

为考察高压辊磨超细碎对磁铁矿石磨矿能耗的影响,对弓长岭磁铁矿石颚式破碎机-20 mm中碎产品分别进行高压辊磨—球磨和直接球磨两种粉碎,然后进行磁选试验、Bond球磨功指数试验,并计算两种磨矿工艺的单位能耗。结果表明:(1)中碎产品经高压辊磨超细碎后更易磨,Bond球磨功指数也更低;(2)高压辊磨—球磨—一段磁选(方案1)和直接球磨—一段磁选(方案2)最佳磨矿细度分别为-0.074 mm占40%、50%,且方案1铁精矿回收率更高;(3)方案1再磨磁选磁精矿产率和回收率分别比方案2高1.73%、2.72%(再磨细度均为-0.074 mm占85%);(4)在一段、二段磨矿细度-0.074 mm分别占50%、85%时,高压辊磨—球磨工艺单位能耗比直接球磨低13.47%,放粗高压辊磨—球磨工艺一段磨矿细度,节能效果更佳显著。试验结果表明高压辊磨在改善矿石可磨性、选矿指标和节约能耗方面的作用,对于推动其应用具有重要意义。

In order to investigate the effect of （HPGR） on grinding energy consumption of magnetite ball milling and direct ball milling were carried out on superfine crushing by high pressure grinding rolls ore, the two kinds of pulverizing process of HPGR- the -20 mm products of magnetite ore from Gong- zhanling crushed by jaw crusher,then magnetic separation test, Bond work index of ball mill test were con- ducted, unit energy consumption of two kinds of grinding process was calculated. The results show that① The product crushed by HPGR is more easily grinded,and Bond work index of ball mill is also lower;②The best grinding fineness of HPGR-ball mill-magnetic separation （ program 1 ） is - 0.074 mm 40%, the best grinding fineness of direct ball mill （program 2） higher than program 2;③The yield and recovery is - 0. 074 mm 50%, and recovery rate of program 1 is rate of program 1 regrinding magnetic separation concen- trate are 1.73% and 2.72% higher than program 2 （both of regrinding fineness are -0. 074 mm 85 % ） ;④ The energy consumption of program 1 is 13.47% lower than program 2 when grinding and regrinding fine- ness are -0. 074 mm 50% ,85%. Eenergy saving effect is more significant when grinding fineness of HPGR -ball mill-magnetic separation is coarsened. The experimental results show the role of HPGR in improving ore grindability,mineral processing indicators and saving energy, have great significance to promote its ap- plication.