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对金精矿焙烧氰化浸金工艺产生的尾渣用煤粉作还原剂进行了磁化焙烧研究,通过对尾渣中铁的物相分析表明,尾渣中的铁主要以Fe2O3的形态存在。主要研究了煤粉的加入量、焙烧温度和焙烧时间对尾渣中铁的还原度的影响。结果表明,以煤为原料通过磁化焙烧可以获得Fe3O4,磁化焙烧的较优条件为焙烧温度750℃,焙烧时间1 h,煤粉用量为尾矿重量的10%,可以使焙烧处理的尾矿中Fe2O3的还原度达到51.7%,磁化焙烧后渣中的磁性矿中铁达到72.75%。
Magnetizing calcination of pulverized coal tailings produced by gold leaching process with cyanide leaching was studied. The phase analysis of iron in tailings showed that the iron in the tailings mainly existed in the form of Fe2O3. The effects of the addition of coal powder, calcination temperature and calcination time on the reducibility of iron in tailing were studied. The results show that Fe3O4 can be obtained by magnetizing roasting with coal as raw material. The optimum conditions of magnetization roasting are roasting temperature 750 ℃, roasting time 1 h, pulverized coal dosage 10% of tailings weight, roasting tailings The reduction degree of Fe2O3 reaches 51.7%. After the magnetization roasting, the content of iron in the magnetic ore reaches 72.75%.