摘要:
对某铁尾矿用煤粉作还原剂进行了还原焙烧试验研究。通过对尾矿中铁的物相分析表明,褐铁矿是矿石中主要的有用矿物,其在矿石中含量为67.8%。主要研究了还原剂加入量、焙烧温度和焙烧时间对尾矿中铁的金属化率的影响。结果表明,以煤粉为还原剂通过还原焙烧可以获得金属铁,在煤粉添加量15%、还原焙烧温度1200℃、还原焙烧时间60 min的条件下,铁的金属化率可以达到94%以上,经过一段磁选可以得到铁品位88.90%、铁回收率93.14%的铁精矿。96.22%的铅和95.19%的锌在焙烧过程中以烟尘的形式挥发,可以在烟尘中进一步综合回收。
关键词:
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铁尾矿
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还原焙烧
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金属化率
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磁选
Abstract:
In this paper, the reduction roasting research on an iron tailings using coal dust as re-duction agent was conducted. The iron in the tailings existed mainly as limonite through phase anal-ysis of ferric compounds, and the content of limonite in the ore is 67. 80%. The effect of quantity of coal addition, roasting temperature and roasting time on the iron metallization ratio were studied. The experimental results showed that the metallic iron could be obtained through reduction roasting with coal as a reduction agent. The beset reduction roasting conditions are the addition of coal being 15%, the reduction temperature 1 200℃ and reduction time 60 min. In these conditions, the iron metallization ratio is higher than 94%. The iron concentrates with iron content 88 . 90% at a recov-ery rate of 93. 14% could be obtained though one step magnetic separation. 96. 22% of Pb and 95. 19% of Zn were volatized in the form of smoke during roasting, and could be comprehensive re-covered in further treatment.
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