广西靖西地区菱锰矿浸出及其动力学研究

doi:10.19964/j.issn.1006-4990.2024-0106

Abstract

Abstract:

The rhodochrosite manganese ore from the Jingxi area in Guangxi is characterized by its low grade and the presence of a large amount of alkaline metal oxides，which results in significant acid consumption during the leaching process.When it is scaled up for production，the manganese leaching rate is low，only reaching 85%.To enhance the leaching rate，the said rhodochrosite manganese ore was focused.Through single-factor experiments，the effects of reaction temperature，acid excess coefficient，liquid-to-solid ratio，and reaction time on the leaching rate of manganese from the mineral were studied to optimize the leaching process parameters.Analyses were also conducted on the phase，structure，and morphology of the ore before and after leaching，as well as the kinetics of manganese leaching.The results indicated that under the conditions of a reaction temperature of 85 ℃，an acid excess coefficient of 2.5，a liquid-to-solid ratio of 7∶1，and a reaction time of 4 hours，the leaching rate of the manganese ore could reach 96.13%.Preliminary impurity removal from the leachate before the end of leaching almost completely eliminated Fe and Al impurity elements.After washing the manganese slag for three times，85.62% of the residual manganese in the slag was removed.Based on these findings，a kinetic analysis was performed.The leaching process was described using the unreacted shrinking core model for liquid-solid reactions，revealing that the leaching reaction rate was controlled by chemical reaction，with an activation energy of 42.48 kJ/mol.This technique was characterized by its ability to remove Fe and Al impurity elements during the leaching process，improving the leaching rate of low-grade rhodochrosite manganese ore.

Key words: rhodochrosite, manganese sulfate, leaching, dynamics

CLC Number:

TQ137.12

ZHENG Kexin, WANG Haifeng, WANG Jiawei, ZHOU Xingjie, PEI Zhengqing, LU Ju, MA Dehua. Study on leaching and kinetics of rhododengite in Jingxi area of Guangxi[J]. Inorganic Chemicals Industry, 2025, 57(1): 51-57.

Figures/Tables 12

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w（SiO₂）	w（CaO）	w（MnO）	w（Fe₂O₃）	w（Al₂O₃）	w（MgO）	w（SO₃）	w（K₂O）	w（P₂O₅）	w（TiO₂）
32.545	18.154	18.305	11.634	3.902	3.577	2.002	0.771	0.307	0.179
w（Na₂O）	w（CeO₂）	w（PbO）	w（NiO）	w（SrO）	w（Cl）	w（Co₃O₄）	w（ZnO）	w（Rb₂O）	w（其他）
0.114	0.089	0.067	0.038	0.031	0.021	0.018	0.011	0.005	8.230

洗渣液	洗渣液锰含量/g	洗出率/%
第1次洗渣液	0.580	70.93
第2次洗渣液	0.079	80.38
第3次洗渣液	0.043	85.62

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Study on leaching and kinetics of rhododengite in Jingxi area of Guangxi

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