异步浮选提高某高氧化率铜矿石浮选指标研究

Study on Improving Flotation Index of a High Oxidation Rate Copper Ore by Asynchronous Flotation

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。

The copper oxidation rate of copper oxide ore in a copper sulfide deposit of Heilongjiang is73.02%.The main copper oxide minerals malachite content is 0.57%,silicon malachite content is 0.28%,the main copper sulfide minerals chalcopyrite content is 0.26%,bornite content is 0.15%.Gangue minerals are mainly quartz,kaolinite,biotite and K-feldspar with a small amount of pyrite.Kaolinite,biotite,sericite and other clay minerals and easily argillized minerals are relatively high.Chalcopyrite is mainly associated with gangue minerals such as pyrite.Malachite is irregularly granular or radially wrapped by gangue minerals,and chrysocolla is distributed in fine veins with fine embedded granularity.In order to determine the ore dressing process,the ore dressing test was carried out.The results showed that the pH value of the pulp was adjusted by lime,and the copper oxide minerals were activated by sodium sulfide,when the coarse grinding fineness was 75% of-0.074 mm,and the copper sulfide rough concentrate was reground by the isa mill to-0.038 mm 78%.The copper concentrate with copper grade of 19.71% and copper recovery of67.98% was obtained by using the asynchronous flotation process of floating copper sulfide minerals first and then floating copper oxide minerals.Compared with the mixed flotation process,the copper concentrate grade is 1.45 percentage points higher and the copper recovery rate is 4.47 percentage points higher.