硬团聚对轻烧粉氧化镁酸化浸出率的影响机制研究  

Mechanism of the Effect of Hard Agglomeration on the Efficiency of Magnesium Oxide Acidizing Leaching Rate in Lightly Fired Powders

作　　者：刘宇 白丽梅 马玉新[1,2,3] 李绍英 赵留成 LIU Yu;BAI Limei;MA Yuxin;LI Shaoying;ZHAO Liucheng(College of Mining Engineering,North China University of Science and Technology,Tangshan 063210,China;Collaborative Innovation Center for Green Development and Ecological Restoration of Mineral Resources,Tangshan 063210,China;Hebei Mining Development and Safety Technology Laboratory,Tangshan 063210,China)

机构地区：[1]华北理工大学矿业工程学院,河北唐山063210 [2]矿产资源绿色开发与生态修复协同创新中心,河北唐山063210 [3]河北省矿业开发与安全技术实验室,河北唐山063210

出　　处：《湿法冶金》2024年第3期250-257,共8页Hydrometallurgy of China

基　　金：河北省自然科学基金(钢铁联合)资助项目(E2022209127);河北省高等学校科学技术研究项目(CXY2023008);河北省教育厅自然科学研究项目(QN2024215)。

摘　　要：研究了采用盐酸酸化法从菱镁矿低温煅烧所得轻烧粉中浸出镁,考察了盐酸添加方式、盐酸浓度、液固体积质量比、外力作用方式和反应时间对镁浸出率的影响,采用收缩核模型分析了超声条件下轻烧粉的浸出动力学,并进一步分析浸渣的粒度分布、矿物成分及矿物嵌布特征。结果表明:在反向缓慢添加盐酸、盐酸浓度14.8%、液固体积质量比9.8/1、搅拌速度400 r/min、浸出时间12.5 min条件下,镁浸出率达70.48%;引入超声可使硬团聚产生裂纹或碎解,有利于固液传质,将镁浸出率提高至90.56%;轻烧粉的浸出过程符合表面化学反应及产物层扩散的混合控制模型;硬团聚内部镁氧比为1.33,边缘为1.65,内部有大量未反应的镁,超声作用使浸渣粒度由42.61μm减小至24.39μm,超声的气泡振动力和空泡破灭形成的冲击波可有效防止硬团聚的形成或使硬团聚重新碎解分散。The leaching of magnesium from lightly fired powders obtained from low temperature calcination of magnesite by hydrochloric acid acidification was studied.The effects of addition method of hydrochloric acid,concentration of hydrochloric acid,liquid volume/solid mass ratio,external force way and reaction time on magnesium leaching rate were investigated.The leaching kinetics of lightly fired powders under ultrasonic condition was analyzed by using shrinkage core model.And the particle size distribution,mineral composition and mineral distribution characteristics of leaching residue were further analyzed.The results show that under the conditions of slowly adding hydrochloric acid,hydrochloric acid concentration of 14.8%,liquid volume/solid mass ratio of 9.8/1,stirring speed of 400 r/min and leaching time of 12.5 min,the leaching rate of magnesium can reach 70.48%.Using ultrasound can cause hard agglomeration to produce cracks or disintegration,which is beneficial to solid-liquid mass transfer,and the magnesium leaching rate is increased to 90.56%.The leaching process of lightly fired powders conforms to the mixed control model of surface chemical reaction and product layer diffusion.The ratio of magnesium to oxygen in the hard agglomeration is 1.33,the edge is 1.65,and there is a large amount of unreacted magnesium in the hard agglomeration.The particle size of the leaching slag is reduced from 42.61μm to 24.39μm by ultrasonic action.The ultrasonic bubble vibration force and the shock wave formed by the cavitation collapse can effectively prevent the formation of hard agglomeration or make the hard agglomeration re-disaggregate.

关 键 词：轻烧粉 镁 浸出 盐酸 硬团聚 机制 动力学 

分 类 号：TF803.21[冶金工程—有色金属冶金] TF822