Transferring behavior and reaction kinetics of saprolitic laterite during metalized reduction in the presence of calcium fluoride
Transferring behavior and reaction kinetics of saprolitic laterite during metalized reduction in the presence of calcium fluoride
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DOI：
10.1016/j.mineng.2021.107353
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发表时间：
2022-01
影响因子：
4.8
通讯作者：
Weijiao Yang;Bao-zhong Ma;Xiang Li;Die Hu;Chengya Wang;Hua Wang
中科院分区：
文献类型：
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作者：
Weijiao Yang;Bao-zhong Ma;Xiang Li;Die Hu;Chengya Wang;Hua Wang
红土矿是镍最重要的原生碱源，但低镍腐泥红土矿难以经济利用。本研究的目的是探讨拟提出的非熔融态金属化还原（NSMR）技术的腐泥土红土。首先，以西南红土矿为原料，分析了氟化钙存在下的非金属磁流变反应的热力学。系统研究了不同因素下镍、铁的富集工艺。随后，分析了镍和铁在NSMR过程中的行为。最后，研究了金属化还原过程的动力学，并测定了反应表观活化能。结果表明，镍和铁的回收率分别高达92.9%和84.6%，并以镍铁精矿的形式产出，可作为炼钢原料。氟化钙可以抑制镍进入含镍硅酸镁相，避免镍的惰性，并显著提高其金属化。NSMR的反应过程符合Avrami-Eroféev反应模型（n = 0.5），表观活化能（Ea）为309.16 kJ mol-1。该研究证明了所提出的NSMR技术的理论完善性，该技术可能实现长期停滞状态下的全球低镍矿的商业化利用。
Laterite ore is the most important primary base source of nickel, however low-nickel saprolitic laterite is difficult to economically utilize. This study aims to investigate the proposed nonmolten-state metalized reduction (NSMR) technology for saprolitic laterite. First, the thermodynamics of NSMR in the presence of calcium fluoride was analyzed using laterite from Southwest China as raw material. Then, the process for concentrating nickel and iron under different factors was systematically studied. Subsequently, the behavior of nickel and iron during the NSMR process was analyzed. Lastly, the kinetics of the metalized reduction process was examined, and the reaction apparent activation energy was determined. Results showed that nickel and iron recoveries can reach as high as 92.9% and 84.6%, respectively, and these two metals are produced in the form of nickel–iron concentrate, which can be used as raw material for steel making. Calcium fluoride can inhibit nickel from entering the nickel-bearing magnesium silicate phase, avoiding the inertness of nickel and considerably increasing its metallization. The reaction process of NSMR conforms to the Avrami–Eroféev reaction model (n = 0.5) and the apparent activation energy (Ea) is 309.16 kJ mol−1. This research demonstrates the theoretical perfection of the proposed NSMR technology, which may realize the commercial utilization of worldwide low-nickel ore in a long-term stagnant state.