Optimization and Comparative Analysis of Neutralization Agents for Iron, Aluminum, and Chromium Removal in HPAL Pregnant Leach Solution

IF 2.3 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
JOM Pub Date : 2025-09-05 DOI:10.1007/s11837-025-07699-z
Apriansyah Dwi, Weizhi Zeng, Pengyun Xu
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Abstract

High-pressure acid leaching (HPAL) pregnant leach solution (PLS) derived from laterite ore contains valuable metals, such as nickel and cobalt, alongside impurities, including iron, aluminum, and chromium. Efficient impurity removal with minimal losses of valuable metals is essential for effective PLS purification. This study investigates the effect of CaCO3 particle size (− 400 mesh) on precipitation performance, revealing an 11% improvement in aluminum removal efficiency compared to coarser particles. A two-stage precipitation process was found to be optimal. In the first stage (80°C, pH 3.0, 2 h), 96% Fe, 92% Al, and 97% Cr were removed, with minimal co-precipitation of Ni (1.04%) and Co (2.05%). The second stage (70°C, pH 4.5, 1.5 h) achieved 99.9% removal of Fe, Al, and Cr, though with slightly higher Ni loss (3.95%). Morphological analysis revealed that CaCO3 produced crystalline residues, facilitating improved solid-liquid separation compared to the amorphous residues formed using NaOH and MgO. The thermogravimetric analysis confirmed superior moisture control in CaCO3-derived residues, showing only 2.88% mass loss at 115°C, significantly lower than residues from MgO and NaOH. These results provide practical guidance for impurity removal in HPAL operations and highlight the effectiveness of CaCO3 as a neutralizing agent.

Abstract Image

Abstract Image

HPAL妊娠浸出液中除铁、铝、铬中和剂的优化及对比分析
从红土矿石中提取的高压酸浸(HPAL)浸出液(PLS)含有有价金属,如镍和钴,以及杂质,包括铁、铝和铬。有效的杂质去除与最小的损失有价金属是必不可少的有效PLS净化。本研究考察了CaCO3粒度(- 400目)对沉淀性能的影响,发现与粗粒度相比,CaCO3的除铝效率提高了11%。发现两阶段的沉淀过程是最优的。在第一阶段(80°C, pH 3.0, 2 h)中,96%的Fe, 92%的Al和97%的Cr被去除,Ni(1.04%)和Co(2.05%)共析出。第二阶段(70°C, pH 4.5, 1.5 h) Fe、Al和Cr的去除率达到99.9%,但Ni的损失率略高(3.95%)。形态学分析表明,与NaOH和MgO形成的无定形残留物相比,CaCO3产生了结晶残留物,促进了固液分离。热重分析证实了caco3衍生残留物具有良好的水分控制能力,在115°C时,caco3衍生残留物的质量损失仅为2.88%,显著低于MgO和NaOH衍生残留物。这些结果为HPAL操作中的杂质去除提供了实用指导,并突出了CaCO3作为中和剂的有效性。
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来源期刊
JOM
JOM 工程技术-材料科学:综合
CiteScore
4.50
自引率
3.80%
发文量
540
审稿时长
2.8 months
期刊介绍: JOM is a technical journal devoted to exploring the many aspects of materials science and engineering. JOM reports scholarly work that explores the state-of-the-art processing, fabrication, design, and application of metals, ceramics, plastics, composites, and other materials. In pursuing this goal, JOM strives to balance the interests of the laboratory and the marketplace by reporting academic, industrial, and government-sponsored work from around the world.
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