火法焙烧蛇纹石制取氢氧化镁工艺研究

Process Research on Serpentine Fire Roasting to Leaching Magnesium and Preparation of Mg(OH)_2

改变传统的酸浸取法,研究添加硫酸铵火法焙烧蛇纹石以浸出镁的适宜工艺条件,并用该法制备超细氢氧化镁,对试验中消耗的硫酸铵进行回收,并测试回收后的焙烧再用效果。结果表明,在本实验设计的工艺流程下蛇纹石中镁元素的一次烧出率可以达到62.42%,制备的超细氢氧化镁的白度可达99.8%,二次粒径d50≤10μm,硫酸铵回收率为55%,但返回焙烧再用效果较好。

Changing the traditional acid extraction method, a method of using fire roasting and adding ammonium sulfate to leach magnesium from serpentine was explored. And the optimum technological conditions were studied. Then using the filtrate from calcined materials dissolved in water, superfine magnesium hydroxide particles was prepared. The related craft link were also optimized to determine the best technological condition. The recovery tests of ammonium sulfate consumed in the test were carried out and the effect after the recovered was reused to be calcined was also tested. Then the cycle of whole process was completed. The results showed that magnesium leached from serpentine reached a rate of 62.42% under the designed process. The content of Mg （OH）_2 in the superfine magnesium hydroxide product was 85.63%, whiteness was 99.8%, d_50≤10 μm. The recovery of ammonium sulfate was 55%.