Unlike anhydrous magnesium sulfate, magnesium sulfate heptahydrate contains 7 crystalline waters. It is used and used in agriculture, aquatic products, industry, building materials (such as magnesium sulfate board), refractory materials, medicine, printing and dyeing, sewage treatment and other fields, which can greatly improve the user's product quality and efficiency.

The use of magnesium sulfate heptahydrate in agriculture:

1. In agriculture, magnesium sulfate heptahydrate is a kind of dual-nutrient high-quality fertilizer (containing Mg and S). Sulfur and magnesium are both medium elements of crops and are the fifth and sixth major nutrients of crops. It can not only increase the yield of fruit trees, potatoes, grapes, forage, soybeans, peanuts, vegetables, rice, wheat, rye, tobacco, sugar cane, sugar beets, citrus and other crops, but also improve the taste of fruits; However, magnesium sulfate heptahydrate fertilizer should not be used in agriculture in excessive quantities. If it is used with liquid fertilizer, the concentration generally does not exceed 0.5g/L; if it is used in solid state, the concentration generally does not exceed 0.5g/L. Fertilizer, the magnesium sulfate mixed in the 1500kg farm fertilizer applied per acre is also about 50kg. If the amount of magnesium sulfate heptahydrate is too large, it will affect the normal growth of plants and fruit quality.

2. Magnesium sulfate heptahydrate is used as a supplement, additive, and activator of magnesium in the processing of animal husbandry feed in agriculture. It plays an important role in the metabolism and nerve function of livestock and poultry, making livestock and poultry healthy and vigorous.

Magnesium is an indispensable factor in the bone-building process and muscle contraction of livestock and poultry. It is an activator of various enzymes in livestock and poultry. It plays an extremely important role in the metabolism and nerve function of livestock and poultry. Magnesium deficiency in livestock and poultry can lead to material metabolism and nerve dysfunction, supply disorders, affect the growth and development of livestock and poultry, and even lead to death.Adding an appropriate amount of magnesium sulfate to feed and drinking water can meet the needs of cow sebum growth and greatly improve the quality and quantity of milk produced by cows.

The magnesium ions in magnesium sulfate heptahydrate have antagonistic effects on calcium ions. They are physiological calcium antagonists. They have the effect of relieving asthma, eliminating mucosal edema and bronchospasm, enlarging blood vessels, anti-abnormal heart rhythm and platelet aggregation. It is currently mainly used clinically for the treatment of volumetric diarrhea, choleretic, calming, anticonvulsant and other conditions. This is the role of magnesium sulfate heptahydrate in veterinary medicine.

The role of magnesium sulfate heptahydrate in aquatic products:

The aquaculture role of magnesium sulfate heptahydrate in the agricultural field is conducive to the growth of positive bacteria and makes aquatic products more fruitful.

Magnesium sulfate heptahydrate can be used to prevent and treat fixed ciliariasis in aquaculture animals such as crabs and shrimp.In addition, zinc sulfate contains a variety of mineral elements, which can effectively regulate the osmotic pressure inside and outside the cells of shrimp and crabs in water bodies, and can effectively inhibit the stress response of shrimp and crabs when the salinity of the water body gathers and drops. At the same time, it can also play a role in the convergence of the epidermis, making the surface of the shrimp and crabs clear, thereby increasing the market rate of commercial shrimp and crabs.

Industrial use of magnesium sulfate heptahydrate：

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

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 sulfate 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, magnesium sulfate panels, etc.

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

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

6. 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.

7. 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.

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

9. In the printing and dyeing industry, magnesium sulfate heptahydrate can be used as a dyeing agent, alkali inhibitor, 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 used in the production of rayon.

10. In the electroplating industry, it 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.

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

12. In the light industry, it is used as a stabilizer for calcium hydrogen phosphate in the production of fresh yeast, monosodium glutamate, beverages, mineral water, health salt, sea crystal, bath kang, “Bolton” beer and toothpaste.