High gradient magnetic separation (HGMS) is a potential method of separating chalcopyrite from copper-arsenopyrite co-flotation concentrate. However, during the co-flotation process the addition of bleaching powder (ClO−), which has been a common depressant for arsenopyrite, deteriorates their separation selectivity in the subsequent HGMS process, and until today this effect of ClO− is unknown to people. Pulsating HGMS (PHGMS) technology was used to separate a pure chalcopyrite-arsenopyrite mixture containing 16.85 % Cu and 22.44 % As. It was found that when the concentration of ClO− was increased from 0 % to 10 %, the Cu recovery in magnetic chalcopyrite concentrate was increased from 79.07 % to 88.69 %, with its Cu grade decreased from 20.25 % to 17.65 %; and, the As recovery in the concentrate was significantly increased from 26.82 % to 65.50 %, with As grade increased from 9.92 % to 18.83 %. The X-ray photoelectron spectroscopy (XPS) and electrochemical analysis on the chalcopyrite concentrate revealed that ClO− preferentially oxidized the iron sulfides in arsenopyrite to iron oxides; and, the Crystal Field Theory (CFT) analysis revealed that the magnetic moment of Fe in arsenopyrite was increased from 0 to 5.92B.M after these Fe atoms reacted with ClO−, and the number of single electrons in Fe was increased from 0 to 5. As a result, the magnetic susceptibility of arsenopyrite was increased and more arsenopyrite particles were separated into chalcopyrite concentrate during the PHGMS process, deteriorating the separation selectivity of chalcopyrite from arsenopyrite.

中文翻译：

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漂白粉 （ClO−） 对砷黄铁矿黄铜矿脉动 HGMS 的影响


高梯度磁选 （HGMS） 是从铜-砷黄铁矿共浮选精矿中分离黄铜矿的一种潜在方法。然而，在共浮选过程中，添加漂白粉 （ClO-） 一直是砷黄铁矿的常见抑制剂，在随后的 HGMS 过程中降低了它们的分离选择性，直到今天，人们还不知道 ClO-的这种作用。脉动 HGMS （PHGMS） 技术用于分离含有 16.85 % Cu 和 22.44 % As 的纯黄铜矿-砷铁矿混合物。研究发现，当 ClO− 浓度从 0 % 增加到 10 % 时，磁性黄铜矿精矿中的 Cu 回收率从 79.07 % 增加到 88.69 %，Cu 品位从 20.25 % 降低到 17.65 %;并且，精矿中的砷回收率从 26.82 % 显著提高到 65.50 %，砷品位从 9.92 % 提高到 18.83 %。黄铜矿精矿的 X 射线光电子能谱 （XPS） 和电化学分析表明，ClO− 优先将砷黄铁矿中的硫化铁氧化为氧化铁;并且，晶场理论 （CFT） 分析表明，砷黄铁矿中 Fe 的磁矩从 0 增加到 5.92B。这些 Fe 原子与 ClO 反应后 M−，Fe 中的单电子数从 0 增加到 5。结果，在 PHGMS 过程中，砷黄铁矿的磁化率增加，更多的砷黄铁矿颗粒被分离成黄铜矿精矿，恶化了黄铜矿从砷铁矿中的分离选择性。