【作者】 唐志雷； 卿彬菊； 朱朝梁； 邓小川；

【Author】 Zhilei Tang;Binju Qing;Chaoliang Zhu;Xiaochuan Deng;Qinghai Institute of Salt Lakes, Chinese Academy of Science;

【机构】 中国科学院青海盐湖研究所；

【摘要】 在青海盐湖提锂工业生产中,富锂卤水精制除杂工序均副产有数量可观的粗品氢氧化镁。因其包裹、夹带了大量的LiCl、NaOH、硼酸盐等杂质,纯度很低,难以利用,不仅造成资源浪费还产生较大的环保压力。将产物氢氧化镁加以提纯、改性,制成高附加值的碱式硫酸镁晶须（Magnesium oxysulfate,简称MOS）材料,是解决镁资源浪费和环境压力的有效手段。本文通过溶液法对盐湖提锂副产氢氧化镁进行了提纯,使氢氧化镁的含量由70.9%提高至94.7%,并以提纯后的氢氧化镁为原料采用水热法合成了纯度高、形貌均匀,长径比高的MOS晶须,同时研究了原料配比、反应温度、反应时间和搅拌强度等合成条件对MOS晶须结构和形貌的影响。研究结果表明,MgS O₄·7H₂O和Mg（OH）₂配比大于2:3时,反应温度140²00℃,反应时间4¹0h,搅拌强度中等时可以得到纯度高、形貌均匀、长径比高的MOS晶须。更多还原

【Abstract】 Purification and efficient use of the byproduct magnesium hydroxide in extracting Lithium from Salt Lake, is an effective way to solve the waste and environmental pollution of the magnesium source. In this work, the crude magnesium hydroxide is purified by a simple method, the content of magnesium hydroxide is increased from 70.9% to 94.7%. Magnesium oxysulfate（MOS） whisker with high purity, uniform morphology and high aspect ratio is synthesized from purified magnesium hydroxide by hydrothermal mothed. The effects of the raw material ratio, reaction conditions, reaction temperature, reaction time and stirring intensity to the structure and morphology of MOS whisker are also studied. The results show MOS whisker with high purity, uniform morphology and high aspect ratio is formed when Mg SO₄ · 7H₂O and Mg（OH）₂ ratio is greater than 2: 3, the reaction temperature is 140 200 ℃, reaction time is 4 10 h, and the stirring strength is medium.更多还原