广西靖西地区菱锰矿浸出及其动力学研究
收稿日期: 2024-02-28
网络出版日期: 2025-01-24
基金资助
贵州省重大专项(黔科合重大专项［2022］003);贵州省科技支撑重点项目（黔科合支撑［2022］重点020）;铜仁市科技计划项目［（2021）13号］
Study on leaching and kinetics of rhododengite in Jingxi area of Guangxi
Received date: 2024-02-28
Online published: 2025-01-24
广西靖西地区菱锰矿由于品位较低，存在大量碱性金属氧化物，浸出过程酸耗较大，规模生产时锰浸出率低，仅有85%。为提高其浸出率，以该菱锰矿为研究对象，通过单因素实验研究反应温度、酸过量系数、液固质量比（简称液固比）及反应时间对矿物中锰元素浸出率的影响，优化浸出过程的工艺参数，并对浸出前后的物相、结构、形貌，以及锰浸出动力学进行了分析。结果表明，在反应温度为85 ℃、酸过量系数为2.5、液固比为7∶1、反应时间为4 h的条件下，该锰矿浸出率可达到96.13%。浸出结束前对浸出液进行初步除杂，Fe、Al杂质元素几乎被除尽。对锰渣进行3次洗渣处理后，可以洗掉85.62%残留在渣中的锰元素。在此基础上进行动力学分析，浸出过程用液-固未反应收缩核模型描述，发现浸出反应速率受化学反应控制，其活化能为42.48 kJ/mol。该工艺具有在浸出过程去除Fe、Al杂质元素，提高低品位菱锰矿浸出率的特点。
郑可欣 , 王海峰 , 王家伟 , 周兴杰 , 裴正清 , 鲁菊 , 马德华 . 广西靖西地区菱锰矿浸出及其动力学研究[J]. 无机盐工业, 2025 , 57(1) : 51 -57 . DOI: 10.19964/j.issn.1006-4990.2024-0106
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
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