直浸铜渣制备硫酸铜除铁工艺研究

Study on Technology of Iron Removal in Process of Producing Copper Sulfate with the Leaching Copper Slag

文章采用直浸铜渣制备工业级五水硫酸铜,研究和比较了石灰乳、磷酸钠和碱式碳酸铜三种沉淀剂除铁工艺。试验结果表明:石灰乳调节溶液p H 4.0,在80℃下反应3 h,除铁率最高,达到99%,但是铜损耗率大;当Na3PO4溶液加入量为12 m L/L,常温反应3 h下,除铁率为96%左右;当加入碱式碳酸铜调节p H为3.5时,铁去除率为98%,铜损耗最低为3%。采用碱式碳酸铜法除铁工艺后,蒸发结晶制备的五水硫酸铜产品经分析含Cu SO4·5H2O 98.83%,Fe含量在0.001%以下,产品质量达到工业级国家标准。

Producing industrial grade copper sulfate pentahydrate from the leaching of copper slag. In this paper, three precipitant iron removal methods have been studied and compared. Results indicated that when iron was removed by precipitating in the form of calcium hydroxide （ 80 ℃, pH = d. 0, t = 3 h ） , the iron removal rate was highest 99% ,but copper lose at most,too. While by precipitating in the form of sodium phosphate（ 12 mL/L,t = 3 h） ,the iron removal rate was about 96%. While by precipitating in the form of basic copper carbonate（pH = 3.5）, the iron removal rate was 98%, and copper lose a minimum of 3%. After iron was removed by basic copper carbonate method,the product of copper sulfate pentahydrate with a purity of 98.83% and iron below 0. 001% by evaporation and crystallization was obtained. And the quality of copper sulfate meets the national standards of industry.