铜渣与镁渣复合改质后磁选提铁的工艺研究

Process Study on Iron Extraction with Magnetic Separation from Combined Modification of Copper Slag and Magnesium Slag

将工业铜渣和工业镁渣按一定比例混合后进行复合改质,对改质后混合渣进行磁选,并通过XRD、SEM分析和热力学计算对改质前后混合渣中的物相变化特征进行研究。结果表明,复合改质能够使铜渣中弱磁性富铁相铁橄榄石向强磁性镁铁尖晶石转变,并可通过磁选进行分离。碱度的降低有利于混合渣中镁铁尖晶石形成,但不利于硅酸盐相生成。本文试验范围内碱度的最佳值为2.05,在该碱度下混合渣的磁选产率和回收率分别为65.32%和79.34%,且磁选后尾渣中硅酸盐相含量相对较多。

Industrial copper slag was modified by mixing industrial magnesium slag with a certain proportion.The modified slag was magnetic separated.Analysis on mineral phase changes in mixed slag before and after modification was carried out by XRD,SEM analysis and thermodynamic calculation.The results show that composite modification of copper slag and magnesium slag can effectively transform ironrich phase of iron olivine into ferromagnetic magnesia spinel in copper slag,and the latter can be effectively separated by magnetic separation.Decrease of alkalinity is favorable for formation of magnesium iron spinel in mixed slag but is not favorable for silicate.The optimum setting of basicity in the experimental range is 2.05.Magnetic separation yield and recovery of mixed slag are 65.32% and 79.34%,respectively,and content of silicate phase in tailings after magnetic separation is relatively high.