Nonmolten state metalized reduction of saprolitic laterite ores: Effective extraction and process optimization of nickel and iron
Nonmolten state metalized reduction of saprolitic laterite ores: Effective extraction and process optimization of nickel and iron
复制标题
腐泥土红土矿石的非熔融态金属化还原：镍和铁的有效提取和工艺优化
DOI：
10.1016/j.jclepro.2020.120415
复制
发表时间：
2020-05-20
影响因子：
11.1
通讯作者：
Wang, Chengyan
中科院分区：
文献类型：
--
作者：
Ma, Baozhong;Li, Xiang;Wang, Chengyan
红土矿是一种重要的镍矿原料资源，从低镍腐泥红土矿中提取有价金属的方法尚未完全开发。本文提出了一种在管式炉中从腐泥红土矿中提取镍和铁的非熔融态金属化还原（NSMR）工艺。在对矿石进行矿物学研究和NSMR可行性分析的基础上，系统研究了不同影响因素下镍、铁的直接金属化行为。结果表明，镍和铁的回收率分别为14.2%和32.5%。为优化反应工艺，考察了添加剂、预脱水、调整矿物组成对镍、铁回收率的影响，结果表明，优化后镍、铁回收率分别提高到94.1%和87.4%。对比分析了优化前后镍、铁的行为。镍和铁在优化前原位金属化，但没有明显的迁移或迁移。优化后的镍铁固溶体大部分聚合成带状，有利于磁选。结果表明，优化后的工艺能有效地提高镍和铁的金属化程度。铁回收率低于镍回收率的原因是两种元素在矿石中存在状态不同。新生成的铁橄榄石是铁回收率低的主要原因。同时，尾矿中零星嵌布的少量镍铁是造成铁、镍损失的主要原因。提出的创新工艺可实现腐泥型红土矿的非熔融金属化和镍、铁的有效浮选。(C)2020爱思唯尔有限公司版权所有。
Laterite ore is an important raw nickel ore resource, and methods for extracting valuable metals from low-nickel saprolitic laterite has not been fully developed. This paper proposes a technology, called nonmolten state metalized reduction (NSMR), for extracting nickel and iron from saprolitic laterite in a tube furnace. On the basis of the mineralogical study of ores and feasibility analysis of NSMR, the direct metalization behavior of nickel and iron under different influencing factors was systematically studied. Results showed that the recoveries of nickel and iron were only 14.2% and 32.5%, respectively. For the optimization of the reaction process, the effects of additives, predehydration, and regulating mineral composition on the recovery of nickel and iron were investigated, and the results showed that the recoveries of nickel and iron after optimization increased to 94.1% and 87.4%, respectively. The behaviors of nickel and iron before and after optimization were compared and analyzed. Nickel and iron were metalized in situ before optimization but did not migrate or polymerize remarkably. After optimization, most of the nickeleiron solid solution was polymerized and showed a ribbon shape, which is beneficial for magnetic separation. This result confirmed that the optimized process can effectively improve the metalization of nickel and iron. The lower rate of iron recovery as compared with that of nickel recovery was attributed to the different existing states of the two elements in the ore. The newly generated fayalite was the primary reason for the low iron recovery. Meanwhile, a small amount of sporadically embedded ferronickel in the tailings was responsible for the loss of iron and nickel. The proposed innovative technology can realize nonmolten metalized saprolitic laterite ores and effective beneficiation of nickel and iron. (C) 2020 Elsevier Ltd. All rights reserved.