Green process to recover magnesium chloride from residue solution of potassium chloride production plant |
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Authors: | Lin WANG Yunliang HE Yanfei WANG Ying BAO Jingkang WANG |
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Affiliation: | (1) School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China |
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Abstract: | The green process to recover magnesium chloride from the residue solution of a potassium chloride production plant, which
comes from the leach solution of a potash mine in Laos, is designed and optimized. The residue solution contains magnesium
chloride above 25 wt-%, potassiumchloride and sodium chloride together below 5 wt-% and a few other ions such as Br−, SO4
2− and Ca2+. The recovery process contains two steps: the previous impurity removal operation and the two-stage evaporation-cooling crystallization
procedure to produce magnesium chloride. The crystallized impurity carnallite obtained from the first step is recycled to
the potassium chloride plant to recover the potassium salt. The developed process is a zero discharge one and thus fulfills
the requirements for green chemical industrial production. The produced magnesium chloride is up to industrial criteria.
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Translated from Modern Chemical Industry, 2008, 28(1): 58–61 译自: 现代化工] |
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Keywords: | magnesium chloride two stage evaporation cooling crystallization green technological process |
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