异步浮选提高某高氧化率铜矿石浮选指标研究

黑龙江某硫化铜矿床中的氧化铜矿石铜氧化率73.02%,主要氧化铜矿物孔雀石含量0.57%、硅孔雀石含量0.28%,主要硫化铜矿物黄铜矿含量0.26%、斑铜矿含量0.15%;脉石矿物主要是石英、高岭石、黑云母及钾长石,黄铁矿少量,高岭石、黑云母、绢云母等黏土矿物及易泥化矿物含量较高;黄铜矿主要与黄铁矿等脉石矿物连生,孔雀石呈不规则粒状或放射状被脉石矿物包裹,硅孔雀石呈细脉状分布,嵌布粒度较细。为确定矿石的选矿工艺进行了选矿试验。结果表明,通过石灰调节矿浆pH值,硫化钠活化氧化铜矿物,粗磨细度-0.074 mm占75%,硫化铜粗精矿艾萨磨再磨至-0.038 mm占78%情况下,采用先浮硫化铜矿物、后浮氧化铜矿物的异步浮选流程处理矿石,可获得铜品位19.71%、铜回收率67.98%的铜精矿,与混合浮选流程相比,铜精矿品位高1.45个百分点,铜回收率高4.47个百分点。

云南某高氧化率混合铜矿石选矿试验

云南某混合型铜矿石氧化率高达47.06%,且大量铜矿物以极细粒与脉石矿物共生,分选难度极大。对该矿石进行了浮选工艺技术条件研究。结果表明,采用磨矿—3次粗选—粗精矿再磨—2次精选的闭路流程处理,在有硫化钠活化的情况下,获得了铜品位为23.03%、回收率为54.65%的铜精矿。

Leaching kinetics of molybdenum from Ni-Mo ore in sulfuric acid solution with sodium peroxodisulfate as oxidant

The leaching kinetics of molybdenum from Ni-Mo ore in sulfuric acid solution with sodium peroxodisulfate was studied.The effects including leaching temperature, reaction time, particle size, stirring speed, and concentrations of sulfuric acid and sodium peroxodisulfate were investigated. The leaching process of molybdenum from Ni-Mo ore is controlled by the chemical reaction through the solid layer across the unreacted shrinking core. The apparent activation energy of the leaching of molybdenum is calculated to be 41.0 k J/mol and the leaching kinetics equation of molybdenum from Ni-Mo ore is expressed as1-(1-a)1/3=3405.7exp[-41030.0/(RT)]t.