Magnesium oxide is a raw material for smelting magnesium metal. It is in the form of white fine powder and is odorless. Magnesium oxide powder can be divided into two types: light magnesium oxide and heavy magnesium oxide. It is light in volume, white amorphous powder, odorless, tasteless and non-toxic, with a density of 3.58g/cm3. It is difficult to dissolve in pure water and organic solvents, and its solubility in water is increased by the presence of carbon dioxide. It can be dissolved in acid and ammonium salt solution and converted into crystal after high temperature burning. When it meets carbon dioxide in the air, it forms magnesium carbonate double salt, which is heavy and compact and is a white or beige powder. It easily combines with water and easily absorbs moisture and carbon dioxide when exposed to the air. It is easy to gel and harden when mixed with magnesium chloride solution.
Industrial grade light burned magnesium oxide is mainly used in the production of magnesite products. Light-burned magnesium oxide and magnesium chloride aqueous solution are mixed in a certain proportion to gel and harden into a hardened body with certain physical and mechanical properties, which is called magnesite cement. Magnesite cement, as a new type of cement, has the advantages of light weight, high strength, fire protection and heat insulation, energy saving and environmental protection, and can be widely used in building materials, municipal administration, agriculture, machinery and other fields. With the industrial upgrading and the demand and development of the high-tech functional materials market, a series of high-tech fine magnesium oxide products have been developed and produced, which are mainly used in high-grade lubricants, high-grade tanning alkali grades, food grades, pharmaceuticals, and silicon steel grades. , advanced electromagnetic grade, high-purity magnesium oxide and other nearly ten varieties.
High-grade lubricant grade magnesium oxide is mainly used as a detergent, vanadium inhibitor, and desulfurizer in the processing of high-grade lubricants, which greatly improves the density and rheology of the lubricating film and reduces ash content. Deleaching and mercury removal reduce the environmental pollution caused by lubricating oil or fuel waste. The surface-treated magnesium oxide can also be used as a complexing agent, chelating agent, and carrier in the oil refining process, which is more conducive to product fractionation and improves product quality. Especially when heavy oil is burned, adding Mg0 can eliminate the damage to the furnace caused by the vanadic acid in the heavy oil.
Food-grade magnesium oxide is used as a food additive, color stabilizer, and pH adjuster as a magnesium supplement for health products and foods. It is used as a decolorizing agent for refining sugar, a PH adjuster for ice cream powder, etc. As an anti-caking agent and antacid, it is used in wheat flour, milk powder chocolate, cocoa powder, grape powder, sugar powder and other fields. It can also be used in the fields of manufacturing ceramics, enamel, glass, dyes and other fields.
Medical grade magnesium oxide can be used as an antacid, adsorbent, desulfurizer, deleaching agent, complexing filter aid, pH regulator in the field of biopharmaceuticals. It can be used as an antacid and laxative in medicine to inhibit and relieve gastric acidosis. Many, treat gastric ulcer and duodenal ulcer disease. It has a strong, slow and lasting effect on neutralizing gastric acid without producing carbon dioxide.
Silicon steel grade magnesium oxide has good magnetic permeability (that is, it has a large positive magnetic susceptibility) and excellent insulation properties (that is, the conductivity can be as low as 10-14us/cm in a dense state). A good insulating layer and magnetic permeable medium can be formed on the surface of the silicon steel sheet to suppress and overcome the eddy current and skin effect loss (iron loss) of the silicon steel core in the transformer. Improve the insulation performance of silicon steel sheets and be used as high-temperature annealing isolating agent. It can also be used as ceramic materials, electronic materials, chemical raw materials, binders, additives, etc. in silicon steel as dephosphorizing agent, desulfurizing agent, and insulating coating forming agent.
High-grade electromagnetic grade magnesium oxide is used in wireless high-frequency paramagnetic permeable materials, magnetic rod antennas, magnetic cores of frequency modulation components, etc. Replace ferrite. It can be used in the production of composite superconducting magnetic materials and is also used in the electronic magnet industry. As “soft magnetic material”. It is also an ideal raw material for industrial enamels and ceramics.
High-purity magnesium oxide has excellent alkali resistance and electrical insulation at high temperatures. It has high thermal expansion coefficient and thermal conductivity and good light transmittance. It is widely used as high-temperature heat-resistant materials. In the field of ceramics, it is used as a raw material for translucent ceramic crucibles and substrates. In the field of electrical materials, it is used as filler for magnetic devices, fillers for insulating materials, and various carriers. When used as a ceramic substrate, the thermal conductivity is more than 2 times higher than that of alumina, and the loss of electrolyte is only 1/10 of that of alumina. It can also be used as a raw material for high-purity fused magnesite, and chemically it can be used as “analytically pure” magnesium oxide.