Preparation of pre-reduced pellet using pyrite cinder containing nonferrous metals with high temperature chloridizingreduction roasting technology—Effect of CaCl2 additive
Preparation of pre-reduced pellet using pyrite cinder containing nonferrous metals with high temperature chloridizingreduction roasting technology—Effect of CaCl2 additive
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DOI：
10.1007/s11771-015-2962-3
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发表时间：
2015-11
影响因子：
4.4
通讯作者：
D. Chen;D. Zhu;Lan Hong;Yao Chen;Jifang Xu;Ling Wu
中科院分区：
文献类型：
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作者：
D. Chen;D. Zhu;Lan Hong;Yao Chen;Jifang Xu;Ling Wu
为获得高铁品位、低有色金属含量的高强度高炉炉料，研究了CaCl2在高温氯化还原焙烧过程中的作用。研究了CaCl2用量对造球、预热和还原的影响。结果表明，CaCl 2能提高黄铁矿烧结绿色球的湿滴强度，但降低了热稳定性。当CaCl2加入量超过1%时，预热球团的抗压强度降低，但氧化铁颗粒的长大得到促进。此外，CaCl2的加入提高了预还原球团的抗压强度，但降低了预还原球团的金属化程度。去除试验表明，在不加CaCl2的情况下，Zn可以完全去除，Cu只能在加CaCl2的条件下去除，而Pb的部分去除则必须加CaCl2。
The role of CaCl2during the high temperature chloridizing-reduction roasting process was investigated, aiming at acquiring high strength blast furnace burden with high iron grade and low nonferrous metals content. The effects of CaCl2dosage on pelletizing, preheating and reduction were investigated. The results show that CaCl2can improve the wet drop strength but reduces the thermostability of pyrite cinder green balls. When the dosage of CaCl2exceeds 1%, the compressive strength of preheated pellets decreases while the growth of iron oxide particles is improved. Furthermore, the compressive strength of pre-reduced pellets increases but the metallization degree of pre-reduced pellets decreases with CaCl2additive. The removal tests indicate that Zn can be removed completely without CaCl2additive, Cu is removed only under the condition with CaCl2additive and part of Pb must be removed by CaCl2additive.