Comparative study of limonitic and saprolitic laterite ores on the leaching characteristics under atmospheric pressure

IF 4.9 2区工程技术 Q1 ENGINEERING, CHEMICAL

Minerals Engineering Pub Date : 2025-03-15 DOI:10.1016/j.mineng.2025.109250

Hee-Eun Jeong , Heewon Kang , Sowon Choi , Hyunjung Kim

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Abstract

Sulfuric acid leaching as a function of acid dosage (200–800 kg H₂SO₄/dmt) and time (1–168 h) was performed on saprolitic laterite ores (SL) and limonitic laterite ores (LL) from different regions to characterize and compare the leaching behavior of saprolitic and limonitic laterite ores at room temperature and atmospheric pressure. The major mineral of SL is antigorite/lizardite, whereas the main minerals of LL are goethite and talc. The metal leaching efficiency of both SL and LL increased with rising acid dosage, and leaching behavior was related to acid consumption. The nickel leaching efficiency and rate constant of SL were higher than that of LL under the same acid dosage condition. XRD analysis on the residue after leaching confirmed that serpentine is easier to leach than goethite and talc due to the mineral structure. Kinetic analyses showed that the leaching of laterite ores employed in the present work was well fitted to the Shrinking Core Model with the rate-determining step of a solid product layer diffusion.

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对来自不同地区的闪长岩红土矿（SL）和褐铁矿红土矿（LL）进行了硫酸浸出，并将其作为酸剂量（200-800 kg H2SO4/dmt）和时间（1-168 h）的函数，以描述和比较闪长岩红土矿和褐铁矿红土矿在室温和常压下的浸出行为。SL的主要矿物为锑橄榄石/锂辉石，而LL的主要矿物为网纹石和滑石。SL 和 LL 的金属浸出效率均随酸用量的增加而提高，浸出行为与酸消耗量有关。在相同的酸用量条件下，SL 的镍浸出效率和速率常数均高于 LL。对浸出后残渣的 XRD 分析表明，由于矿物结构的原因，蛇纹石比鹅卵石和滑石更容易浸出。动力学分析表明，本研究中采用的红土矿石浸出方法非常符合收缩岩心模型，其速率决定步骤为固体产物层扩散。

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来源期刊

Minerals Engineering 工程技术-工程：化工

CiteScore

8.70

自引率

18.80%

发文量

519

审稿时长

81 days

期刊介绍： The purpose of the journal is to provide for the rapid publication of topical papers featuring the latest developments in the allied fields of mineral processing and extractive metallurgy. Its wide ranging coverage of research and practical (operating) topics includes physical separation methods, such as comminution, flotation concentration and dewatering, chemical methods such as bio-, hydro-, and electro-metallurgy, analytical techniques, process control, simulation and instrumentation, and mineralogical aspects of processing. Environmental issues, particularly those pertaining to sustainable development, will also be strongly covered.