Product Description

Description

Industrial-grade magnesium sulfate monohydrate is a commonly used inorganic chemical raw material in industrial production. Compared to agricultural-grade products, it has higher purity and stricter impurity control, making it suitable for processing needs in various industrial scenarios. The following is a detailed introduction to its core information:

1. Core Specifications and Characteristics

· Basic Parameters: Chemical formula: MgSO₄・H₂O, CAS No. 14168-73-1, Molecular weight: 138.38. It is mostly a white powder or crystal, with a density of 2.57 g/mL (25℃), a melting point of 150℃, and is easily decomposed by heat. It can be dehydrated to Anhydrous Magnesium Sulfate at 320-330℃. It is readily soluble in water, slightly soluble in glycerol and alcohol, and insoluble in acetone and acetic acid. Moisture protection is necessary during storage and transportation to prevent moisture absorption and clumping.

· Purity and Impurity Standards: The purity of mainstream industrial-grade products on the market is mostly 98%-99%, with some high-standard products reaching purity above 99%. Simultaneously, the content of harmful impurities will be strictly controlled, such as iron content ≤0.0015%, lead content ≤0.0008%, and water-insoluble matter ≤0.001%, to meet the basic requirements for raw material purity in industrial production and reduce the interference of impurities on subsequent production.

2. Main Industrial Application Scenarios

· Chemical Raw Materials: It is a core raw material for the preparation of high-end magnesium salt products such as lightweight magnesium carbonate and magnesium hydroxide. Its low impurity characteristics simplify subsequent impurity removal processes, improving the purity and production efficiency of downstream magnesium salt products; it can also be used as an auxiliary raw material in organic synthesis reactions, helping to stabilize the reaction system and ensure the smooth progress of the reaction.

· Building Materials and Fireproofing: It can be used as a raw material for magnesium sulfate cement, which has the characteristics of rapid setting and hardening and high strength, suitable for making fireproof boards, decorative components, etc.; it is also an important additive in fireproof coatings, which can improve the flame retardant properties of the coating and delay the spread of fire.

• Dyeing and Papermaking: In high-end fabric dyeing, it can adjust the pH of the dye liquor to a stable range, ensuring uniform dyeing and preventing problems such as dull color and color difference in the fabric. In the papermaking industry, it can be used as a filler to reduce production costs, improve the strength and stiffness of paper, and also as an auxiliary treatment in the pulp bleaching process.

• Other Industrial Applications: In the leather industry, it is used for tanning and softening leather, making the leather softer and less prone to deformation. In the synthesis of ABS and PVC resins, it is used as an auxiliary agent to optimize the processing performance and stability of the resin. In addition, it can be used as an industrial dehydrating agent and flocculant to remove impurities in wastewater treatment or to assist in the drying of industrial materials.

3. Mainstream Production Processes

• Dehydration Method: Using Magnesium Sulfate Heptahydrate crystals as raw material, dehydration and drying are carried out at a high temperature above 200℃ to directly obtain magnesium sulfate monohydrate product. This method is mature and commonly used in industry.

• High-temperature crystallization method: After clarifying a concentrated magnesium sulfate solution at 80-90℃, it is fed into a high-temperature, high-pressure crystallization reactor, heated to 180℃, and crystallized. After venting, the solution is quickly separated to produce high-purity magnesium sulfate monohydrate.

• Acid-base reaction method: Magnesium sulfate monohydrate is produced by directly reacting magnesia powder (mainly magnesium oxide) with concentrated sulfuric acid, followed by filtration, concentration, and crystallization. This method uses readily available raw materials and is suitable for large-scale production; however, reaction conditions must be controlled to ensure product purity.

4. Packaging and Safety Requirements

• Packaging specifications: Common packaging is a 25 kg/bag with an inner plastic and outer woven bag. Larger packaging sizes such as 50 kg and 200 kg are also available to meet the bulk purchasing needs of different companies.

• Safe operation: The dust is irritating to mucous membranes. Operators must wear dust masks, protective glasses, and rubber gloves. If accidental contact occurs with skin or eyes, rinse immediately with running water. This product is non-flammable, but it decomposes under high heat, producing harmful gases such as sulfur oxides. Firefighters must wear full-body fire-resistant and gas-protective clothing and operate from upwind.

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