Method for preparing sodium chloride and magnesium sulphate heptahydrate with brine

The invention discloses a method for using brine to produce sodium chloride and heptahydrate magnesium sulfate, comprising the steps that: (1) brine is taken as a raw material, the molar ratio of SO4<2->:Mg<2+> in the brine is 0.1-0.8, and the molar ratio of SO4<2->:Na<+> is...

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Bibliographic Details
Main Authors GE JINYANG, ZHOU HUAN
Format Patent
LanguageChinese
English
Published 10.02.2010
Subjects
CHEMISTRY
COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM,RUBIDIUM, CAESIUM, OR FRANCIUM
INORGANIC CHEMISTRY
METALLURGY
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Summary:The invention discloses a method for using brine to produce sodium chloride and heptahydrate magnesium sulfate, comprising the steps that: (1) brine is taken as a raw material, the molar ratio of SO4<2->:Mg<2+> in the brine is 0.1-0.8, and the molar ratio of SO4<2->:Na<+> is 0.025-1; and the pressure is decreased for boiling evaporation, the pressure is controlled to make the boiling temperature be 75 DEG C to 50 DEG C after the evaporation, and the molar ratio of SO4 :Na<+> in the solution is 0.4-2.5; (2) solid-liquid separation is implemented, and the solid phase is washed with saturated sodium chloride aqueous solution and is then dried for obtaining the sodium chloride; (3) a mother liquid of salt production is added with water to prepare a mixture; (4) the mixture is cooled and guided into a crystallizer, then crystals are separated out; and (5) solid-liquid separation is carried out for obtaining a crude product having a solid phase of heptahydrate magnesium sulfate. The methodhas advantages of simple e
Bibliography:Application Number: CN2008154198