Add industrial magnesium sulfate heptahydrate into a hot distilled water tank containing 80℃-90℃, stir while heating, dissolve to a mass concentration of 1.21g/cm3, remove impurities such as arsenic and heavy metals with alkali, filter and decolorize with activated carbon, Concentrate to a mass concentration of 1.370g/cm3-1.384g/cm3, crystallize by cooling, separate and wash when the temperature reaches 25°C-15°C, and dry at 50°C-55°C with a vibrating fluidized bed. , different washing degrees, different grades of high-purity magnesium sulfate heptahydrate can be obtained.

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