Zinc leaching from smithsonite ore in lactic acid solution: Studies on parametric optimization, kinetic and mechanism

IF 1.3 4区化学 Q3 CHEMISTRY, MULTIDISCIPLINARY

Bulletin of the Chemical Society of Ethiopia Pub Date : 2023-03-06 DOI:10.4314/bcse.v37i3.15

Sıla Sadiye Ilhan, F. Demir, Omer Lacin, Fatih Sevim

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引用次数: 0

Abstract

ABSTRACT. The solubility of low-grade zinc ores with a selective leaching environmentally friendly reagent has become a focus of great interest since zinc and its compounds have found wide application. For this purpose, lactic acid was used to investigate the selective leaching kinetics of smithsonite ore obtained from Kayseri region. The effects of particle size (137.5-725 µm), acid concentration (0.5-5 M), solid/liquid ratio (0.5/250-3/250 g mL-1), stirring speed (500-800 rpm) and temperature (40-70 °C) parameters on the smithsonite dissolution rate were experimentally studied. The results obtained show that leaching of about 99.8% of zinc is achieved using 425 µm particle size at a reaction temperature of 70 °C for 45 min reaction time with 2 M lactic acid, the solid/liquid ratio of 1/250 g mL-1 and stirring speed of 600 rpm. The statistical analysis of the experimental data obtained from the parameters revealed that smithsonite dissolution was the surface reaction-controlled with an apparent activation energy of 53.62 kJ.moL-1. The kinetic model describing the process was found as KEY WORDS: Smithsonite, Dissolution kinetics, Lactic acid, Zinc lactate Bull. Chem. Soc. Ethiop. 2023, 37(3), 735-744. DOI: https://dx.doi.org/10.4314/bcse.v37i3.15

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乳酸溶液中史密斯矿浸出锌的参数优化、动力学及机理研究

摘要随着锌及其化合物的广泛应用，用环境友好型试剂选择性浸出低品位锌矿石的溶解度已成为人们关注的焦点。为此，采用乳酸法研究了开塞利地区菱锌矿的选择性浸出动力学。实验研究了粒度(137.5 ~ 725µm)、酸浓度(0.5 ~ 5 m)、料液比(0.5/250 ~ 3/250 g mL-1)、搅拌速度(500 ~ 800 rpm)、温度(40 ~ 70℃)等参数对smithsonite溶解速率的影响。结果表明:在料液比为1/250 g mL-1、搅拌转速为600 rpm、反应温度为70℃、反应时间为45 min、粒度为425µm的条件下，锌的浸出率可达99.8%左右。对实验数据的统计分析表明，smithsonite的溶解受表面反应控制，表观活化能为53.62 kJ.moL-1。关键词:Smithsonite，溶解动力学，乳酸，乳酸锌。化学。Soc。阿比西尼亚人。2023年,37 (3),735 - 744 . DOI: https://dx.doi.org/10.4314/bcse.v37i3.15

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来源期刊

Bulletin of the Chemical Society of Ethiopia 化学-化学综合

CiteScore

2.20

自引率

8.30%

发文量

113

审稿时长

6-12 weeks

期刊介绍： The Bulletin of the Chemical Society of Ethiopia (BCSE) is a triannual publication of the Chemical Society of Ethiopia. The BCSE is an open access and peer reviewed journal. The BCSE invites contributions in any field of basic and applied chemistry.