1. Chemical & Physical Properties
Magnesium Sulfate Heptahydrate, with the chemical formula MgSO₄·7H₂O and molecular weight 246.47, belongs to the orthorhombic crystal system.It appears as colorless or white needle‑like or prismatic crystals, with a glassy luster; aggregates may be white, rose or green. Odorless, with a bitter and cooling taste.
- Density: 1.68–1.71 g/cm³
- Melting point: 1124 °C
- Solubility at 20 °C: 1 mol/L; freely soluble in water, slightly soluble in ethanol and glycerol, insoluble in acetone.
Thermal stability:
- Stable below 48.1 °C; easily efflorescent in warm, dry air.
- At 67.5 °C: dissolves in its own water of crystallization.
- 70–80 °C: loses 4 molecules of water of crystallization.
- 100 °C: loses 5 molecules.
- 150 °C: loses 6 molecules.
- Above 200 °C: completely dehydrated to anhydrous magnesium sulfate powder.The dehydrated product can reabsorb water in a humid environment, forming a dynamic hydration equilibrium.
2. Main Applications
Agricultural Use
As a high‑efficiency magnesium fertilizer, it significantly improves crop yield and quality.Magnesium is a core component of chlorophyll, enhancing photosynthesis and root development.Trials show yield increases of 15–20% in rubber trees, fruit trees, vegetables and other crops when using magnesium‑containing compound fertilizers.
- Base fertilizer: 3–7 kg per mu
- Foliar spray: 0.5–1% solution
Industrial Applications
- Dyeing & printing: Weighting agent for cotton and silk fabrics (0.5–2%), filler for kapok products, improving fabric density and hand feel.
- Leather tanning: Fills leather pores, improving softness and wear resistance; dosage 3–5% of leather weight.
- Fire‑resistant materials: Used as a flame retardant for acrylate resins; addition of 15–20% significantly improves fire resistance.
- Wastewater treatment: Removes heavy metal ions via coagulation; dosage 50–100 mg/L for printing and dyeing wastewater.
Light Industry Applications
- Food additive: In China, permitted dosage is 3–7 g/kg in dairy products, max. 0.05 g/kg in mineral drinks.
- Feed additive: Supplements magnesium for livestock and poultry, promoting bone development; dosage 0.1–0.2% in broiler feed.
3. Advantages of Baiyexin Magnesium Sulfate Heptahydrate
Process & Quality Advantages (Core Strengths)
- High purity & low impurities: Produced via multi‑stage ion exchange + membrane filtration + DCS precision crystallization. Industrial‑grade purity stably ≥99.5%. Heavy metals, chloride and water‑insoluble matter are far below national standards, with impurities ~30% lower than the industry average.
- Controllable crystal form: Low‑temperature evaporation / continuous crystallization technology, uniform particle size (0.3–2 mm), good flowability, fast dissolution, suitable for diverse applications.
- Full‑process quality control: Fully enclosed automated production from raw materials to finished products, batch‑by‑batch testing, batch fluctuation ≤±0.2%, top‑grade product rate ≥99.9%.
- Multi‑grade compliance: Covers agricultural, industrial, feed, food and pharmaceutical grades; certified with ISO9001, feed production license, USP and others.
Capacity & Delivery Advantages (Supply Chain Security)
- Large‑scale production: Annual capacity 50,000–150,000 tons, 4–8 automated production lines, monthly supply capacity over 10,000 tons.
- In stock & fast delivery: Regular inventory ≥2000 tons; regular orders shipped in 3–5 days, urgent orders responded within 24–48 hours.
Customization & Technical Advantages (Differentiation)
- Particle size customization: 0.1–5 mm granules, powder and crystals for foliar spray, soil application, dyeing, pharmaceuticals and more.
- Flexible packaging: 25 kg / 50 kg woven bags, 1 ton jumbo bags, small sample packs; OEM & private labeling supported.
- Application technical support: Magnesium deficiency diagnosis and fertilization plans for agriculture; formula optimization and application guidance for industry.
Service & After‑Sales Advantages (Customer Loyalty)
- One‑stop service: Full process support from sampling → selection → supply → after‑sales; 24‑hour technical support.
- Quality assurance: Third‑party inspection reports, rapid handling of quality objections, return & replacement mechanism.
- Long‑term partnership: Customized solutions for key clients, annual contracts, fixed pricing, priority supply.
