硫精矿中铜钴同步浸出试验研究

以湖北大冶含铜钴硫精矿为原料,分别研究了硫精矿、硫精矿氧化焙烧渣和硫精矿氧化-还原焙烧渣中铜、钴的同步浸出行为,考察了浸出温度、浸出时间、固液比等工艺参数对铜、钴浸出的影响。结果表明,硫精矿氧化-还原焙烧渣中的铜、钴最易被浸出,浸出条件为:浸出温度70 ℃、浸出时间4 h、固液比1∶5,此时铜和钴浸出率分别为91.46%和65.84%; 采用氧化-还原焙烧-浸出-磁选联合流程处理硫精矿时,可获得铁品位62.31%、回收率68.26%的铁精矿,该工艺实现了硫精矿及焙烧渣中铜、钴、铁资源的综合回收。

Experimental Study on Synchronous Leaching of Copper and Cobalt from Pyrite Concentrate

The pyrite concentrate containing copper and cobalt from Daye of Hubei Province was taken as the raw material in the experiments for investigating the synchronous leaching behavior of copper and cobalt in sulfur concentrate, residue from oxidizing roasting of sulfur concentrate, residue from oxidization-reduction roasting process of sulfur concentrate. Also, the effects of leaching temperature, leaching time and solid-liquid ratio on leaching rates of copper and cobalt were investigated. It is found that copper and cobalt in the slag from oxidization-reduction roasting of sulfur concentrate are more prone to be leached out. A leaching process at 70 ℃ for 4 h, with solid-liquid ratio of 1∶5 can lead to the leaching rates of copper and cobalt up to 91.46% and 65.84%, respectively. And a combined process of oxidation-reduction roasting, leaching and magnetic separation can result in the iron concentrate grading 62.31%Fe at 68.26% recovery. This technique process can achieve the comprehensive recovery of copper, cobalt and iron resources from sulfur concentrate and roasting residue.