高铁赤泥碳热还原制备镍铁合金

doi:10.19976/j.cnki.43-1448/TF.2021042

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摘要以高铁赤泥和红土镍矿为原料,焦粉为还原剂,通过高温直接还原方法制备镍铁合金,通过对不同温度、还原剂比例、添加剂比例制备的合金及残渣进行分析测试,研究不同还原条件对赤泥和红土镍矿还原过程的影响。结果表明,随还原剂焦粉比例增大,镍铁合金的收得率提高;焦粉质量分数为30%、还原温度为1 550 ℃时,镍铁合金收得率高达89.6%。随添加剂CaO和Na₂CO₃的加入,金属与残渣的分离效果显著提升。当Na₂CO₃的质量分数增加到6%时,红土镍矿中的镍全部还原进入合金,残余奥氏体变少并转变为马氏体,合金硬度提升,洛氏硬度(HRC)为52.5。

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	孙开
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关键词 ：高铁赤泥, 红土镍矿, 铁合金, 碳热还原, 镍铁合金

Abstract：Ferro-nickel alloy was prepared by direct reduction at high temperature with Bayer process using high iron red mud and laterite nickel ore as raw materials and coke powder as reducing agent. The effects of different reduction conditions on the reduction process of red mud and laterite nickel ore were studied by analyzing and testing the alloys and residues prepared at different temperatures, reducing agent ratio and additive ratio. The results show that the reduction yield of the alloy increases with the increase of the coke powder contents of reducing agent. When the addition ratio of coke powder is 30% and the reduction temperature is 1 550 ℃, the total recovery of the iron alloy reaches 89.6%. With the addition of additives CaO and Na₂CO₃, the separation effect of metal and slag is significantly improved. When the addition ratio of Na₂CO₃is 6%, the nickel in laterite nickel ore will be reduced completely to the alloy. The retained austenite decreases and then transforms into martensite and improves the Rockwell hardness to 52.5.

Key words： high-iron red mud laterite nickel ore iron alloy carbothermal reduction ferro-nickel alloy

收稿日期: 2021-04-05 出版日期: 2021-12-22

ZTFLH:

TF815

基金资助:国家自然科学基金河南省联合基金(U1704154)

通讯作者: 王维,教授,博士。电话：0379-65627356;E-mail: wwlyzwkj_003@163.com

引用本文:

孙开, 王维, 张子阳, 朱光. 高铁赤泥碳热还原制备镍铁合金[J]. 粉末冶金材料科学与工程, 2021, 26(6): 560-566.
SUN Kai, WANG Wei, ZHANG Ziyang, ZHU Guang. Preparation of Ni-Fe alloy by carbothermal reduction of high iron red mud. Materials Science and Engineering of Powder Metallurgy, 2021, 26(6): 560-566.

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http://pmbjb.csu.edu.cn/CN/10.19976/j.cnki.43-1448/TF.2021042 或 http://pmbjb.csu.edu.cn/CN/Y2021/V26/I6/560

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