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对流化床中黄铜矿精矿低温氯化和选择性氧化提取铜过程进行了研究.采用二段氯化,使下段排气中残氯和产物S2Cl2在上段中消耗于精矿的氯化,温度分别控制在270和250℃左右,且下段排气残氯浓度不超过0.015%,得到充分氯化的低硫产物.增设一个反应器,仅用氮气对氯化产物热处理,其硫含量进一步降低.低硫氯化产物在350～360℃能平稳进行氧化反应,放出的Cl2在上部反应器中用于精矿的氯化而脱除.稀盐酸对氧化产物浸取有效,pH值在0.30～1.86范围,Cu接近全溶,Fe浸出率不超过5%.浸出液中Cu,Fe和SO42-浓度随固液比提高呈线性增加,固液比为0.5g/mL时,Cu浓度超过115g/L,而Fe/Cu含量比低于0.03,SO42-浓度也很低,满足铜电积操作要求.同时研究了精矿所含微量贵金属和少量杂质随处理过程的变化.
The low temperature chlorination and selective oxidation copper extraction process of chalcopyrite concentrate in fluidized bed were studied.The second stage chlorination was used to make residual chlorine and product S2Cl2 in the lower stage exhausted in the upper section to be chlorinated in concentrate , The temperature is controlled at about 270 and 250 ℃, and the lower exhaust residual chlorine concentration does not exceed 0.015% to obtain fully chlorinated low-sulfur products. Add a reactor, only nitrogen nitrogen heat treatment, the sulfur content further Lower.Chlorosulfurous products at 350 ~ 360 ℃ smooth oxidation reaction, the release of Cl2 in the upper reactor for the chlorination of the concentrate and remove the dilute hydrochloric acid leaching of the effective oxidation of the product, the pH value of 0.30 ~ 1.86, Cu is almost completely dissolved, and the leaching rate of Fe does not exceed 5%. The concentrations of Cu, Fe and SO42- in the leachate increase linearly with the solid-liquid ratio increasing. When the solid-liquid ratio is 0.5g / L, and the ratio of Fe / Cu is less than 0.03, and the concentration of SO42- is also very low, which meets the requirements of copper electrowinning operation.Meanwhile, the changes of the trace precious metals and a few impurities contained in the concentrate with the treatment process were studied.