Analysis Method and Removal Technologies of SO_4~(2-) from Brine

The brine in Caerhan salt lake was the best raw materials for electrolysis magnesium.The brine contained SO42-,which was harmful to electrolysis magnesium process.The requirement of electrolysis magnesium was that the SO42- must be less than 30 mg/L in the brine.Regular methods were not able to deal with the brine for SO2-4≤30 mg/L.Vaporizing,crystal and reaction process was developed to take off SO42- from brine.After a series of operations,the concentration of SO42- in brine reached the requirements of electrolysis magnesium.Meanwhile,the analyzing method for little SO42- in brine was also studied.The spectrophotometry was used to analyze the low concentration of SO42-.