多宝山铜矿石高压电脉冲破碎预处理试验研究

Experiment Study on High Voltage Pulse Pretreatment of Duobaoshan Copper Ore

通过对比高压电脉冲破碎和机械破碎对多宝山铜矿石性质和浮选指标的影响,探索了高压电脉冲破碎预处理对矿石的促进解离、预弱化和预富集等作用效果。采用自制高压电脉冲处理系统在140 kV下对26.5~31.5 mm粒级多宝山铜矿石进行了预处理,并与同条件下的机械破碎产品对比。分别测定了高压电脉冲破碎产品和机械破碎对比样品的硬度指标A×b值、邦德球磨功指数、Cu品位分布、单体解离度和可浮性。结果表明,相比机械破碎产品,高压电脉冲破碎产品的硬度指标A×b值提高了33.9%~39.8%,邦德球磨功指数降低了3.6 kWh/t;高压电脉冲破碎产品的Cu品位随粒度减小而快速增大,能够将69.2%的Cu元素预富集到产率为36.1%的-13.2 mm粒级破碎产品中;通过促进矿物单体解离,高压电脉冲破碎能够将Cu的浮选回收率提高2.33个百分点,精矿铜品位提高约1个百分点。试验结果可以为低品位铜矿石的高效低耗回收提供参考。

The effect of high voltage pulse breakage(HVPB)pre-treatment on Duobaoshan copper ore in terms of liberation improving,pre-weakening and pre-concentration were investigated by comparing the ore properties and flotation performance between products of high voltage pulse breakage and mechanical breakage.Duobaoshan copper ore particles of 26.5~31.5 mm were pre-treated by a self-made high voltage pulse processing system at 140 kV.Comparative sample were prepared by mechanical breakage with the same conditions.The product of HVPB and mechanical breakage were tested in terms of hardness index A×b value,Bond Ball Work Index(BBWI),Cu grade distribution,liberation degree and flotation properties.Results indicated that the hardness index A×b value and BBWI of HVPB product were increased by 33.9%~39.8%and decreased by 3.6 kWh/t respectively,comparing to mechanical breakage product.The Cu grade of HVPB product increased rapidly with the decrease of particle size.Therefore 69.2%of Cu element could be pre-concentrated into the-13.2 mm product of which the yield is 36.1%.By improving the liberation of minerals,HVPB could increase the flotation recovery of Cu by 2.33 percent points and increase the concentrate grade by about 1 percent point.The testing results will provide reference for the high efficient and low costing recovery of low-grade copper ore.