Research Progress in Preparation of Magnesium Hydroxide from Bischofite in Qinghai Salt Lakes
The waste brine from potassium extraction process with salt lake resources in Qinghai Province is evaporated by sun to form a huge amount of bischofite,which threatelled on the ecological environment of the salt lakes.The preparation of magnesium hydroxide from bischofite is an effective way to utilize the solid waste of salt lakes innocuously,resourcefully and decrementally.This paper introduces the genesis,chemical composition and reserve scale of bischofite from Qinghai salt lakes,and summarizes the methods of preparing magnesium hydroxide from salt lake bischofite.The technical principles,process flow and re-search status of direct precipitation,hydrothermal method,acoustic chemical synthesis,microemulsion method and electrodeposition method for the preparation of magnesium hydroxide are introduced,and their technical characteristics are analyzed and compared.The research progress,advantages and technical diffi-culties to be solved for the preparation of high-purity magnesium hydroxide by electrodeposition are intro-duced.
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