Preparation method of anhydrous magnesium sulfate
1.Hot melt leaching
In this way, the mother liquor is poured into the extractor. Here, it should be noted that the concentration of the mother liquor is 30g/100ml, and then the mixed salt solution is added into the extractor. The volume ratio of the two solutions is 2:1, which should also be noted that the mixed salt solution should contain less than 30% magnesium sulfate and less than 35% sodium chloride. The above two solutions should be placed at the temperature of 45~50℃ for 4 hours. After 4 hours, the clear solution removed by sodium chloride should be cooled and crystallized at about 5℃, and then washed, filtered, dried and then dried to get the finished product.
2. recrystallization method
In this way, a certain amount of industrial magnesium sulfate should be put into the dissolution tank, poured water, placed for about two hours, the precipitation of heavy metal sulfate is filtered out, the filtrate should be concentrated, cooling and crystallization, centrifugal separation, and then the liquid above is put into the container for drying and dehydration after the obtained is anhydrous magnesium sulfate.