Magnesium chloride 7786-30-3

Magnesium chloride is mainly used in the production of magnesium metal, as a disinfectant, fire extinguishing agent, ice salt refrigerant, and also applied in industries such as ceramics, textiles, and papermaking. Magnesium chloride solution mixed with magnesium oxide in a certain proportion, commonly known as magnesia cement, is hard and wear-resistant. If wood chips and shavings are added as fillers, it can be made into artificial marble, particleboard, etc. Mixing magnesium chloride with magnesia sand can be used as a lining for steelmaking furnaces. Both seawater and brine contain magnesium chloride. It can be prepared by reacting magnesium oxide or rhodochrosite with hydrochloric acid. Seawater contains 0.32% magnesium chloride (by mass) and is currently the main raw material for producing magnesium chloride. Groundwater is also an important resource for producing magnesium chloride. It can also be prepared by reacting magnesite (MgCO3) with hydrochloric acid. Mainly used in the magnesium industry. Electrolytic magnesium chloride and potassium chloride mixture melt, and magnesium ions are discharged at the cathode to precipitate magnesium. In 1982, more than one-third of the world's electrolytic magnesium raw material (magnesium chloride) came from seawater. Magnesium chloride is prone to moisture absorption, and the textile industry uses it to fill fabrics to keep cotton moist and soft, with an annual usage of tens of thousands of tons. Magnesium chloride has a solubility of 54.2 grams per 100 milliliters in water and is used as a refrigerant when mixed with ice. The thick slurry obtained by mixing magnesium chloride solution with magnesium oxide solidifies into a solid after several hours, which is called magnesium cement. It is hard, wear-resistant, and easy to polish, and is used for filling teeth; Mix with wood chips, sawdust, etc. before solidification, used for making tabletops, floors, etc; It can also be used to manufacture grinding wheels and as an adhesive. The solidification principle of this mixture is to form Mg-O-Mg-O-Mg - type long chains with OH - or Cl atoms as the end of the chain. Magnesium chloride is used as a raw material for granular fertilizers and cotton defoliants; Resin salt precipitation accelerator; Sugar crystallization promoter; High concentration aqueous solutions can greatly lower the freezing point (-30 ℃ at 21%), and can be used as refrigerants and highway anti icing agents; Low temperature defoamers, fire extinguishing agents, disinfectants; Ceramic raw materials; Paper making fillers; Thermal storage body for solar energy equipment; Coagulants used in wastewater treatment; According to GB2760-96 regulations in China, coagulants for soy products can be used; Dehydrating agent; The absorbent for hydrogen chloride in exhaust gas, used as an additive in the lime method to absorb sulfur dioxide, can improve the absorption effect; Food additives, used as mineral supplements, fermentation aids for Japanese sake, tissue improvers for meat products, and athlete beverages; Artificial seawater additives; Medicine is used for infusion and artificial dialysis fluid; Building materials and electric furnace repair materials; Raw materials for electrolytic melting production of magnesium metal; Organic reaction catalysts; Magnesium cement raw materials; Wool refining agent.