Modelling the leaching behaviour and particle-size distribution dynamics of poly-disperse particulate solids in a batch reactor

IF 4.8 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Hydrometallurgy Pub Date : 2025-07-08 DOI:10.1016/j.hydromet.2025.106532

Pavel Raschman, Ľuboš Popovič, Maryna Kyslytsyna, Gabriel Sučik

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引用次数: 0

Abstract

A material-balance model for the leaching of poly-disperse particulate solids, combining the particle size distribution (PSD) and the shrinking particle model (SPM), has been proposed. This model was applied to the leaching of crude natural magnesite (CNM) with dilute HCl solutions. A CNM sample with wide PSD was used to determine the values of apparent reaction order (0.31) and activation energy (51.5 kJ mol⁻¹) from measured data, and to develop a simulation model. Another CNM sample, with identical chemical and phase composition but different PSD, was subsequently used to experimentally investigate how the degree of conversion and PSD change with the leaching time, and to validate the simulation model. Comparison of the experimental and simulation results showed that (a) the kinetic parameter values obtained by the proposed method characterise the intrinsic chemical reaction on the liquid-solid phase interface, regardless of the PSD; and (b) the proposed model can predict how the degree of conversion and PSD of a poly-disperse particulate solid change during the leaching in a batch reactor.

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间歇式反应器中多分散颗粒固体的浸出行为和粒径分布动力学模拟

结合颗粒尺寸分布（PSD）和收缩颗粒模型（SPM），提出了多分散颗粒固体浸出的物质平衡模型。将该模型应用于用稀盐酸溶液浸出天然粗菱镁矿（CNM）。采用宽PSD的CNM样品，根据实测数据确定了表观反应阶数（0.31）和活化能（51.5 kJ mol−1），并建立了模拟模型。随后，采用化学和相组成相同但PSD不同的CNM样品，实验研究了转化率和PSD随浸出时间的变化情况，并验证了模拟模型。实验结果与模拟结果的比较表明：(a)本文方法得到的动力学参数值表征了液固界面上的本征化学反应，与PSD无关；(b)所提出的模型可以预测多分散颗粒固体在间歇反应器中浸出过程中转化程度和PSD的变化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Hydrometallurgy 工程技术-冶金工程

CiteScore

9.50

自引率

6.40%

发文量

144

审稿时长

3.4 months

期刊介绍： Hydrometallurgy aims to compile studies on novel processes, process design, chemistry, modelling, control, economics and interfaces between unit operations, and to provide a forum for discussions on case histories and operational difficulties. Topics covered include: leaching of metal values by chemical reagents or bacterial action at ambient or elevated pressures and temperatures; separation of solids from leach liquors; removal of impurities and recovery of metal values by precipitation, ion exchange, solvent extraction, gaseous reduction, cementation, electro-winning and electro-refining; pre-treatment of ores by roasting or chemical treatments such as halogenation or reduction; recycling of reagents and treatment of effluents.