酸溶条件对橄榄石制备超细二氧化硅的影响  

Effect of Acid Dissolution Conditions on Preparation of Ultrafine Silica by Olivine

作　　者：王玲 贾蓝波 崔兆纯 熊雨婷 范晨子[2] 聂轶苗 刘淑贤 王龙 Wang Ling;Jia Lanbo;Cui Zhaochun;Xiong Yuting;Fan Chenzi;Nie Yimiao;Liu Shuxian;Wang Long(College of Mining Engineering,North China University of Science and Technology,Hebei Province Key Laboratory of Mining Exploitation and Security Technology,Tangshan,Hebei,China;National Research Center for Geoanalysis,Beijing,China)

机构地区：[1]华北理工大学矿业工程学院,河北省矿业开发与安全技术重点实验室,河北唐山063210 [2]国家地质实验测试中心,北京100037

出　　处：《矿产综合利用》2021年第2期152-158,共7页Multipurpose Utilization of Mineral Resources

基　　金：河北省高等学校科学研究计划项目(QN2015091);唐山市科技局项目(19130216g);唐山市工业固体废弃物清洁利用基础创新团队项目(19130207C);中国地质调查项目(DD20190589);河北省自然科学基金项目(E2019209494)。

摘　　要：橄榄石矿物酸溶制备超细二氧化硅,原料价格低廉易得,生产工艺简单,可大大降低超细二氧化硅的生产成本,但酸溶环境对二氧化硅粒径有明显的影响。本文考察了硫酸浓度、液固比、超声分散及金属阳离子对超细二氧化硅粒径大小及分布特征的影响。结果表明,硫酸浓度过高会导致二氧化硅颗粒的团聚;增大液固比、橄榄石酸溶的同时辅以超声分散、延长超声分散时间可显著减少二氧化硅的团聚;金属阳离子会导致二氧化硅的团聚;在硫酸浓度4 mol/L、液固比60 mL/g、酸溶时辅以超声分散可制备出平均粒径5.39μm的超细二氧化硅。本研究为非金属矿酸法制备超细二氧化硅提供理论与技术支持。The cost of ultrafine silica prepared by acid dissolution of olivine minerals can be reduced greatly,the raw material is cheap and is easily to obtain,the production process is simple.But the acid dissolution environment has obvious effect on the particle size of silica.The effects of acid dissolution concentration,liquid-to-solid ratio,ultrasonic dispersion and metal cations on the particle size and dispersion properties of ultrafine silica were investigated.The results showed that high sulfuric acid concentration can lead to agglomeration of silica.Increasing liquid-to-solid ratio,ultrasonic dispersion while olivine acid dissolution,and extending ultrasonic dispersion time can significantly reduce the agglomeration of silica.Metal cations can lead to agglomerate of silica.Ultrafine silica with an average particle size of 5.39μm was produced at 4mol/L sulfuric acid concentration,60 ml/g liquid-to-solid ratio,and ultrasonic dispersion while olivine acid dissolution.This study can provide theoretical and technical support for non-metallic mineral acid dissolution to produce ultrafine silica.

关 键 词：橄榄石 超细二氧化硅 硫酸浓度 液固比 超声分散 

分 类 号：TD989[矿业工程—选矿]