Hebei Messi Biology Co., Ltd. stated that the melting point of magnesium oxide is about 2852℃. It is difficult to dissolve in pure water and organic solvents. The solubility in water increases due to the presence of carbon dioxide. It can be dissolved in acid or ammonium salt solution. After high temperature (above 1000℃), it can be converted into crystals. When the temperature rises to above 1500℃, it becomes dead-burned magnesium oxide or sintered magnesium oxide. It generates magnesium carbonate complex salt when it encounters carbon dioxide in the air.
Light magnesium oxide is generally made of magnesium chloride, magnesium sulfate, or magnesium bicarbonate, which becomes a water-soluble product and then chemically converted into a water-insoluble product, and then calcined into magnesium oxide. The bulk density of the produced product is very small, generally above (g/ml) 0.25, while heavy magnesium oxide is generally directly calcined by magnesite and brucite, and the bulk density is generally about (g/ml) 0.5.
Light magnesium oxide is white, amorphous powder, odorless, tasteless, non-toxic, with a specific gravity of 3.58 (25), a melting point of 2852, and a boiling point of 3600. It is used in metallurgy, smelting, the manufacture of refractory materials and moisturizing materials. It is also widely used in rubber, rubber sheets, rubber products, the pharmaceutical industry, the food industry, plastic sheet promoters, glass fiber reinforced plasticizers, and silicon steel sheet surface coating paint, paper production, steel ball polishing, leather processing, insulation materials, grease, dyes, ceramics, desiccants, resins, flame retardants, etc.
Heavy magnesium oxide is made by calcining and removing impurities from magnesite. There are two types of magnesium oxide, light calcined and heavy calcined. The general term for magnesium oxide is heavy magnesium oxide. It is a white powder; odorless and tasteless; it can slowly absorb carbon dioxide in the air. It is almost insoluble in water, insoluble in ethanol, and soluble in dilute acid. Functions and indications of medical grade heavy magnesium oxide: The anti-acid effect is stronger than that of sodium bicarbonate, slow and lasting, and does not produce carbon dioxide. It reacts with gastric acid to generate magnesium chloride, releases magnesium ions, stimulates intestinal peristalsis, and has a mild laxative effect. It is suitable for patients with hyperacidity accompanied by constipation, gastric and duodenal ulcers. For those without constipation, its mild laxative effect can be corrected by taking calcium carbonate together.