Beneficiation of a Nigerian lepidolite ore by sulfuric acid leaching

IF 0.9 Q3 MINING & MINERAL PROCESSING Mineral Processing and Extractive Metallurgy-Transactions of the Institutions of Mining and Metallurgy Pub Date : 2023-05-26 DOI:10.1080/25726641.2023.2216612

Daud T. Olaoluwa, A. A. Baba, A. L. Oyewole

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Abstract

ABSTRACT The dissolution of a Nigerian lepidolite ore in sulphuric acid solution for its optimal industrial transformation was carried out. The degree of influence of the acid concentration, reaction temperature, particle diameter, and reaction time on the rate of the ore dissolution was investigated. These parameters were observed to enhance the rate of the dissolution as the acid concentration was increased from 0.1 to 1.5 mol/L, reaction temperature from room temperature (27 ± 2°C) to 75°C, particle diameter from 63 to 90 µm and reaction time from 5 to 120 min, respectively. The ore dissolution kinetics was studied using the shrinking core model, based on which the process was found to follow a diffusion-controlled mechanism as the rate-determining step. The activation energy of 18.1 kJ/mol lends support to this assertion. At optimal conditions, the formation of a pure lepidolite crystal (K2Li3Al3Si7O21F3: (96-900-0834)), recommended as a precursor for preparing industrial lithium sulphate was obtained.

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尼日利亚锂云母矿的硫酸浸出选矿

摘要对尼日利亚锂云母矿在硫酸溶液中的溶解进行了优化工业改造。研究了酸浓度、反应温度、粒径和反应时间对矿石溶解速率的影响程度。当酸浓度从0.1增加到1.5时，观察到这些参数提高了溶解速率 mol/L，室温的反应温度（27 ± 2°C）至75°C，粒径为63至90 µm，反应时间从5到120 min。使用缩芯模型研究了矿石溶解动力学，在此基础上发现该过程遵循扩散控制机制作为速率决定步骤。18.1的活化能 kJ/mol支持这一论断。在最佳条件下，获得了纯锂云母晶体（K2Li3Al3Si7O21F3:（96-900-834））的形成，该晶体被推荐为制备工业硫酸锂的前体。

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Mineral Processing and Extractive Metallurgy-Transactions of the Institutions of Mining and Metallurgy MINING & MINERAL PROCESSING-

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3.50

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