Mechanochemical Treatment to Remove Arsenic from Copper Ore
Mechanochemical Treatment to Remove Arsenic from Copper Ore
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DOI：
10.3390/min9060349
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发表时间：
2019-06
期刊：
影响因子：
2.5
通讯作者：
Shingo Ishihara;K. Shinoda;Junya Kano
中科院分区：
文献类型：
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作者：
Shingo Ishihara;K. Shinoda;Junya Kano
研究了行星式球磨机械化学法去除铜精矿中砷的效果。矿石中砷等有害成分逐年增加，导致铜品位下降，因此迫切需要改进铜矿石中砷的分离。通过XRD和X射线吸收光谱（XAS）测量，评价了作为机械化学处理引起的化学活化的结果的研磨效果。根据XRD分析的结果，从原始样品中鉴定出几种结晶矿物。原始样品的衍射峰通过研磨减少，尽管研磨没有产生任何新的衍射峰。比较了干磨和湿磨的结果，发现干磨时结晶矿物的消失速度比湿磨快。为明确铜矿石中砷的化学状态，采用XAS法进行了分析。结果表明，砷化合物由原始样品中的硫化物转变为研磨后的氧化物。由于氧化作用，砷很容易溶于水和碱性溶液中，优化的干磨和湿磨条件下，砷的去除率可达76%。
This study tested the removal of arsenic from copper ore concentrate via a mechanochemical treatment by planetary ball milling. The harmful components of ore, such as arsenic, are increasing year by year and decreasing the copper grade, therefore there is a strong need to improve the separation of arsenic from copper ore. The effect of grinding as a result of chemical activation caused by mechanochemical treatment was evaluated by XRD and X-ray absorption spectroscopy (XAS) measurements. From the results of the XRD analysis, several crystalline minerals were identified from the original samples. The diffraction peaks of the original samples were reduced by grinding, although grinding did not generate any new diffraction peaks. The comparison of the results of grinding in dry and wet conditions showed that the rate of disappearance of the crystalline minerals was faster in dry grinding than in wet grinding. To clarify the chemical state of arsenic in copper ore, XAS analysis was carried out. The results indicated that the arsenic compound changed from sulfide, in the original sample, to oxide after grinding. As a result of oxidation, the arsenic was easy to dissolve in a water and alkaline solution, and optimized dry and wet grinding conditions achieved up to 76% arsenic removal efficiency.