自然碱度铁矾渣含碳球团回收铁研究

Research on Recovery of Iron from Natural-basicity Carbon-containing Pellets of Jarosite Residue

铁矾渣是湿法炼锌过程中沉铁工艺产生的固态废渣,含有一定量的Fe和其它有价金属元素。为了回收铁矾渣中的Fe,开发了铁矾渣含碳球团转底炉直接还原-熔分工艺。通过自然碱度铁矾渣配加煤粉的方式进行直接还原,研究了不同工艺参数对铁矾渣中Fe回收的影响,并进行转底炉中试试验,取得良好效果。最佳工艺条件:还原温度1 100℃,还原时间30 min,wC/wO=1.2,此条件下铁矾渣含碳球团金属化率达到90.6%。中试试验金属化率为75%,铁的综合回收率达到85%。

Jarosite residue is a solid waste originating from iron removal process of zinc hydrometallurgy, containing a certain amount of Fe and other valuable metals. In order to recovery Fe, the rotary hearth fur- nace direct reduction-melting process had been developed to process carbon-containing pellets of jarosite residue. The effect of the process parameters on Fe recovery from jarosite residue was studied, through di- rect reduction of natural basicity carbon-containing pellets of jarosite residue. At the same time, the pilot plant test has been carried out with rotary hearth furnace. The optimum conditions from experimental test are as follows： reduction temperature of 1 100 ℃ ,reduction time of 30 min, C/O = 1.2. Under these conditions, the metallization rate of carbon-containing pellets of jarosite residue reaches 90.6%, the met- allization rate of pilot plant test is 75% ,the comprehensive recovery rate of iron is 85%.