Industrial magnesium sulfate is divided into heptahydrate, monohydrate, and anhydrous magnesium sulfate according to its water content. Its uses are electroplating, printing and dyeing, papermaking, building materials and other industrial fields. Among them, the larger use is magnesium sulfate heptahydrate, followed by industrial anhydrous magnesium sulfate. The seventeen industrial uses, functions and usages of magnesium sulfate heptahydrate are described in detail.——

Electroplating

1. In the electroplating industry, magnesium sulfate is used as a conductive salt: adding magnesium sulfate heptahydrate to the nickel plating solution can make the solution have good electrical conductivity and make the coating white and soft; it can also be used as an aluminum refining additive to color the aluminum surface.

2. In the environmental protection industry, magnesium sulfate heptahydrate is used directly as a sewage treatment agent or as a raw material for sewage treatment agent. It is used in industrial sewage treatment and condenses and settles waste liquid sewage to make it meet sewage discharge standards.

3. In the building materials industry, magnesium sulfate heptahydrate dissolves in water and reacts with heavy and light burning powder (magnesium oxide) to form magnesium sulfide cement. This cement has good thermal insulation, fire resistance, durability and environmental protection. It is used in the production of fireproof panels, exterior wall insulation panels, door core panels, etc.

Fireproof and flame retardant 363

4. In fireproof materials, magnesium sulfate heptahydrate is used as a flame retardant for plastics such as acrylate resin, epoxy resin, unsaturated polyester and polyurethane to enhance the heat resistance of fireproof materials.

5. In the drying and sintering process of magnesium-oxygen refractory materials, magnesium sulfate heptahydrate is used to stabilize the body.

6. In the construction industry, magnesium sulfate heptahydrate is used as a coagulant for cement.

7. In the industrial production of polymer materials such as ABS and EPS, magnesium sulfate monohydrate is used as a polymer emulsion coagulant.

8. In the industrial production of man-made fibers, magnesium sulfate heptahydrate is a component of the spinning bath and an important auxiliary material for viscose fiber and vinylon fiber.

Papermaking application

9. In the pulp production of the paper industry, magnesium sulfate heptahydrate is used to increase the selectivity of oxygen bleaching to remove lignin, improve the quality of cellulose, and save product usage.。

10. Magnesium sulfate heptahydrate is used as a leather processing aid and as a filler, which can make the leather softer, promote the adhesion of the tanning agent and the leather, improve the quality of the leather, and enhance the heat resistance of the leather.

11. In the printing and dyeing industry, magnesium sulfate heptahydrate can be used as a dyeing agent, alkali-resistant agent, aggravating agent, and magnesium dyeing agent for fabrics. It is used in the production of printing and dyeing thin cotton fabrics and silk, as well as in the chemical fiber and textile industries. It is used as a dyeing agent and reductase to ensure uniform dyeing with a pH value between 6-7; it can also be used as a filler for kapok products and for the production of rayon.

12. In the chemical industry, magnesium sulfate heptahydrate is used as a raw material for the manufacture of other magnesium salts such as magnesium stearate, magnesium hydrogen phosphate, magnesium silicate, magnesium oxide, and other sulfates such as potassium sulfate and sodium sulfate.

13. In the microbial industry, magnesium sulfate heptahydrate is used as a medium component, an additive for brewing, a supplement to magnesium for brewing water, and a nutrient source during fermentation.

14. In the light industry, magnesium sulfate heptahydrate is used as a stabilizer for calcium hydrogen phosphate in the production of fresh yeast, monosodium glutamate, beverages, mineral water, health salts, sea crystals, bath kang, “Bolton” beer and toothpaste.

15. In the washing industry, magnesium sulfate heptahydrate is used as a peroxide and perborate stabilizer in detergents to adjust the viscosity of detergents.

16. Magnesium sulfate is used as a nutritional supplement, curing agent, flavor enhancer, processing aid, and nutritional enhancer in additives in the food industry. It can adjust the hardness of water and improve fermentation capacity.

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17. In the pharmaceutical industry, anhydrous magnesium sulfate is used in the formulation of protective ointments, laxatives, analgesics, and antidotes, as well as in the production of anticonvulsants, laxatives, macromycin, acetylpiramycin, creatinine, magnesium trisilicate, gray flavomycin, salinomycin, mycotoxin, tobramycin, nephrotiankang, gibberellin, cirrhomycin sulfate, etc., play a sedative, antispasmodic and reduce intracranial pressure and other effects.