高压辊磨超细碎对铜铁共生矿分选的影响

Influence of Ultrafine Comminution by High Pressure Grinding Rolls on Separation Performance of Copper⁃Bearing Iron Ore

为探究高压辊磨超细碎对铜铁共生矿分选的影响,对其进行了高压辊磨超细碎分选试验,结果表明,高压辊磨产品相比颚式破碎产品粒度小且均匀;高压辊磨破碎产品出现了明显的晶界裂纹;磁选抛尾试验中,高压辊磨产品比颚式破碎产品磁选精矿铁品位提高了0.4个百分点、回收率降低了0.8个百分点,铜品位提高了0.01个百分点、回收率提高了2.11个百分点;浮选试验中,高压辊磨产品比颚式破碎产品浮选粗精矿铜品位提高了0.21个百分点、回收率提高了1.84个百分点;浮选粗选尾矿磁选试验中,高压辊磨产品比颚式破碎产品精矿铁品位提高了1.11个百分点、回收率提高了2.45个百分点。高压辊磨破碎比颚式破碎更有利于铜品位的提升和铁精矿的回收。

In order to explore the influence of ultrafine grinding using high⁃pressure grinding roller(HPGR)on the separation performance of copper⁃bearing iron ore,mineral separation tests were carried out for HPGR milled ore.The results show that HPGR products are usually smaller and more uniform in size compared to jaw crushing products.Furthermore,obvious grain boundary cracks in HPGR products can be observed.Based on the comparison with jaw crushed ore,a test on magnetic separation of HPGR milled ore for tailings discarding led to the obtained product with iron grade up by 0.4 percentage points and iron recovery down by 0.8 percentage points,while both copper grade and recovery up by 0.01 and 2.11 percentage points respectively.A flotation test resulted in the roughing concentrate with copper grade and recovery up by 0.21 percentage points and 1.84 percentage points,respectively.The following magnetic separation test of the obtained roughing tailings led to the final iron concentrate with grade and recovery up by 1.11 and 2.45 percentage points,respectively.It is concluded that compared with jaw crushing,HPGR grinding is more conducive to improving copper grade and recovery of iron concentrate.