Research on Recovery of Iron from Natural-basicity Carbon-containing Pellets of Jarosite Residue
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摘要: 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%。Abstract: 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 furnace 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 direct 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 metallization rate of pilot plant test is 75%,the comprehensive recovery rate of iron is 85%.
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Key words:
- jarosite residue /
- carbon-containing pellets /
- rotary hearth furnace /
- direct reduction /
- melting process /
- iron /
- recovery rate
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