Manufacturing process of magnesium sulfate monohydrate

Magnesium sulfate monohydrate is a combined state in magnesium sulfate. It is white flowing powder. Magnesium sulfate monohydrate is dissolved in water. Insoluble in propanone. Because magnesium is one of the main components of chlorophyll, people usually use magnesium sulfate monohydrate as fertilizer and mineral water additive. Compared with other fertilizers, magnesium sulfate has the advantage of higher solubility. Next, we will understand the production process of magnesium sulfate monohydrate.

1. bittern production by seawater drying salt: bittern is obtained by seawater drying salt, and high temperature salt is produced after magnesium sulfate monohydrate is evaporated by adding brine method, and its composition is more than 30% of MgSO4, less than 35% of NaCL, about 7% of MgCL2 and about 0.5% of KCL.

The bittern can be dissolved in 200g/L MgCL2 solution at 48℃, and NaCL dissolves less, while MgSO4 dissolves more. After separation, the immersion liquid is cooled to 10℃ to precipitate crude MgSO4·7H20, which is recrystallized twice to obtain the finished product.

2. Sulfuric acid method: firstly, slowly add magnesite to water and mother liquor in a neutralization tank, then neutralize magnesium sulfate monohydrate with sulfuric acid until the color changes from earthy white to red, and control PH=5, relative density 1.37-1.38)39-40Bé).

The neutralization solution was filtered at 80℃, then the PH was adjusted to 4 with sulfuric acid, a proper amount of seed crystal was added, and cooled to 30℃ for crystallization. After separation, dry at 50-55℃ to obtain the finished product, and return the mother liquor to the neutralization tank.

3. Low-concentration sulfuric acid can also be neutralized with magnesite with magnesium oxide content of 65%, and magnesium sulfate monohydrate can be prepared by filtration, precipitation, concentration, crystallization, centrifugal separation and drying.

Through the above introduction, we basically know about the production process of magnesium sulfate monohydrate. If you want to know more about magnesium sulfate monohydrate, please pay attention to the update of our Website.