Experimental Study on Comprehensive Recovery of Copper and Sulfur in an Iron-copper Ore from Qinghai
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摘要:
青海某难选铁铜矿,矿物嵌布关系复杂,脉石矿物中蛇纹石、橄榄石、绿泥石等易泥化的镁质硅酸盐矿物含量高。针对该矿石易泥化的特点,对第一段中矿进行"扫精选",大幅度降低了中矿的循环量,减弱了泥质矿物的循环累积,提高了分选指标。最终采用"混合浮选—铜硫分离"工艺综合回收铜、硫等有价元素,闭路试验获得了铜品位16.39%、回收率73.04%的铜精矿和硫品位31.70%、回收率58.32%的硫精矿。
Abstract:A refractory iron-copper ore in Qinghai Province, with characteristics of complex mineral composition and complex dissemination, has a higher content of mafic silicate minerals, such as serpentine, olivine, and chlorite. According to easily slimezation characteristics of mafic silicate minerals, middlings on the first stage were separated further, greatly reducing the circulating load of middlings, weakening circulative accumulation of mud minerals and improving the separation index. Comprehensive recovery of copper and sulfur was carried out using a "bulk flotation, copper-sulphur separation" process. A Copper concentrate with a Cu grade of 16.39% and a sulfur concentrate with an S grade of 31.70% were obtained from the closed circuit test, in which the Cu recovery was 73.04% and the sulfur recovery was 58.32% respectively.
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Key words:
- iron and copper ore /
- bulk flotation /
- scavenging-cleaning /
- copper-sulphur separation
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表 1 原矿化学多元素分析结果 /%
Table 1. Multi-elements analysis results of of raw ores
成分 Cu TFe MFe Zn S As Na2O K2O P Pb CaO MgO SiO2 Al2O3 Au Ag 含量 0.46 37.35 31.76 0.38 5.12 0.25 0.05 0.30 0.038 0.06 3.78 12.12 14.76 2.04 0.12 <5.0 注:Au、Ag单位为g/t。 表 2 原矿矿物组成分析结果 /%
Table 2. Mineral composition analysis results of raw ores
矿物组成 磁铁矿 黄铁矿 磁黄铁矿 黄铜矿 毒砂 闪锌矿 铁铝榴石 辉石 方解石 角闪石 绿泥石 橄榄石 蛇纹石 其他 含量 48.97 9.58 1.10 1.09 0.34 0.57 2.86 6.14 2.71 2.47 5.83 5.04 8.86 5.01 表 3 混合浮选常规闭路试验结果 /%
Table 3. Comparative test results of bulk flotation
闭路试验流程 产品名称 产率 品位 回收率 Cu S Cu S 常规闭路 混合精矿 11.21 3.24 30.07 78.95 67.69 尾矿 88.79 0.11 1.81 21.05 32.31 原矿 100.00 0.46 4.98 100.00 100.00 “扫精选”闭路 混合精矿 11.27 3.35 30.22 81.01 68.67 尾矿 88.73 0.10 1.75 18.99 31.33 原矿 100.00 0.47 4.96 100.00 100.00 表 4 铜硫分离浮选闭路试验结果 /%
Table 4. Test results of copper-sulphur separation
产品名称 作业产率 品位 作业回收率 Cu S Cu S 铜精矿 18.52 16.39 25.13 90.07 15.27 硫精矿 81.48 0.410 31.70 9.93 84.73 混合粗选精矿 100.00 3.37 30.48 100.00 100.00 表 5 “混合浮选—铜硫分离”全流程闭路试验结果
Table 5. Test results of bulk flotation and copper-sulphur separation
产品名称 产率/% 品位/% 回收率/% Cu S Cu S 铜精矿 2.09 16.39 25.13 73.04 10.57 硫精矿 9.18 0.41 31.70 7.97 58.32 混浮尾矿 88.73 0.10 1.75 18.99 31.11 原矿 100.00 0.47 4.99 100.00 100.00 表 6 尾矿样品主要矿物粒度组成
Table 6. Size distribution of tailings
粒级/μm <5 5~10 10~20 20~38 38~75 75~150 黄铜矿分布率/% 42.02 8.84 5.13 44.01 0 0 表 7 尾矿样品主要矿物单体解离度
Table 7. Liberation degree of chalcopyrite in tailings
解离程度 <30%连体/% 30%~60%连体/% 60%~90%连体/% 单体解离/% 黄铜矿分布率/% 24.68 8.46 46.45 20.41 -
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