摘要
以青海察尔汗盐湖卤水为原料,以氨水为沉淀剂,采用直接沉淀法制备了粒径分布均匀、分散性良好的微米级球状氢氧化镁。考察了反应温度、陈化时间、氨水加入量、沉淀剂滴加速度等工艺条件对氢氧化镁结晶及产率的影响,并通过正交试验设计优化实验条件。采用SEM分析手段对产品的粒径分布、形貌等进行了表征。结果表明,当反应温度为60℃、陈化时间为150 min、氨水加入量40 mL、沉淀剂滴加速度为6 mL/min时,制备的氢氧化镁晶体粒度均匀,结构清晰,分散性好,产率较高,产品平均粒径为20μm。该工艺条件为制备微米级球状氢氧化镁晶体提供了科学依据。
In this work,Micron-sized spherical magnesium hydroxide with uniform morphology and particle size was synthesized via distribution direct precipitation method using brine from Chaerhan Salt Lake in Qinghai Province as raw material,ammonia as precipitator.The effects of reaction temperature,aging time,amount of ammonia and precipitator dropping acceleration on the crystallization and yield of magnesium hydroxide were investigated.The experimental conditions were optimized by orthogonal design.The particle size distribution and morphology of the product were characterized by SEM.The results showed that when the reaction temperature was 60℃,the aging time was 150 min,the amount of ammonia was 40 mL,and the precipitator dropping acceleration was 6 mL/min,the crystal size of magnesium hydroxide prepared was uniform,the structure was clear,the dispersion was good,the yield was high,and the average particle size was 20μm.The technological conditions provide a scientific basis for the preparation of micron spherical magnesium hydroxide crystals.
作者
徐贵钰
殷海青
马明鹏
XU Guiyu;YIN Haiqing;MA Mingpeng(School of Chemistry and Chemical Engineering,Qinghai University for Nationalities,Xining,Qinghai 810007,China)
出处
《贵州师范大学学报（自然科学版）》
CAS
2021年第3期48-52,共5页
Journal of Guizhou Normal University：Natural Sciences
基金
国家自然科学基金项目(51762037)
青藏高原资源化学与环境保护国家民委重点实验室。
关键词
盐湖卤水
氨法
氢氧化镁
工艺探究
salt lake brine
ammonia process
magnesium hydroxide
technology research
