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| Preparation of High Purity Magnesium Hydroxide from Magnesite Acid Leaching Solution |
| Received:January 22, 2022 Revised:March 15, 2022 |
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| DOI：doi：10.3969/j.issn.1007-7545.2022.07.007 |
| KeyWord:magnesite; magnesium sulphate; ammonium hydroxide; magnesium hydroxide; high purity |
| Author | Institution |
| BAI Jing |
营口理工学院 辽宁 营口 |
| YANG Jia-he |
营口理工学院 辽宁 营口 |
| LI Gang |
营口理工学院 辽宁 营口 |
| GU Hui-min |
东北大学 辽宁 沈阳 |
| HUANG Fu-yan |
营口理工学院 辽宁 营口 |
| MENG Yu-fei |
营口理工学院 辽宁 营口 |
| ZHENG Jun-tong |
营口理工学院 辽宁 营口 |
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| Abstract: |
| High purity magnesium hydroxide with high purity and excellent performance was prepared by applying magnesium sulfate solution obtained from acid leaching of low-grade magnesite as raw material and ammonia as precipitant. The precipitation effect of magnesium under different conditions was investigated by changing concentration of magnesium sulfate, reaction time and temperature, ammonia concentration, aging temperature and aging time. The precipitation rate of Mg2+ is 90% above under the optimum process conditions including aging temperature of 55 ℃, aging time of 60 min, magnesium sulfate solution concentration of 1.5 mol/L, reaction time of 50 min, reaction temperature of 55 ℃, and ammonia concentration of 21%. The obtained magnesium hydroxide sample has complete crystal form, small and uniform particle size, regular spherical, with a few agglomerations. The average particle size is about 2 μm, and the purity is above 99.5%, which is higher than the requirements of industrial magnesium hydroxide Grade I product standard (HG/T 3607—2000). |
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