Magnesium oxide (chemical formula: MgO) is an oxide of magnesium, an ionic compound. It is a white solid at room temperature. Magnesium oxide exists in the form of periclase in nature and is a raw material for magnesium smelting.
Magnesium oxide has a high degree of refractory insulation properties. It can be converted into crystals by burning at a temperature above 1000 ° C. When it is raised to 1500 - 2000 ° C, it is formed into a burnt magnesia (also known as magnesia) or sintered magnesia.
Double reduction carbonization
In order to increase the extraction rate of magnesium oxide and reduce the energy consumption of the product. To improve product quality and increase product variety, the double-reduction carbonization process mainly changes the carbonization conditions and subtracts the high-energy production process. The purified lime emulsion is subjected to a carbonization reaction under specific conditions to dissolve 80-90% of MgO, and a supersaturated solution of light magnesium carbonate containing 20-30 g/liter of MgO is formed. After rapid pressure filtration, the basic magnesium carbonate is resolved under a specific condition by a saturated solution of light magnesium carbonate at 20-30 degrees. The basic magnesium carbonate filter cake has a moisture content of only 50-60%. Calcined to obtain a light magnesium oxide product.
The process features: (1) The extraction rate of magnesium oxide is increased by 20-30%.
(2) The compression and pyrolysis process is subtracted, and the moisture content of the basic magnesium carbonate filter cake is reduced by 25-30%.
Therefore, the coal consumption per ton of light magnesium oxide product is reduced by 75%, and the power consumption is reduced by 65%.
Gas phase method
The high-purity magnesium metal and oxygen are reacted to form crystal nuclei, and then the particles are further grown to obtain high-purity fine powder magnesia. The crude raw material containing 80% by weight or more of magnesium oxide is dissolved with a mineral acid (sulfuric acid, hydrochloric acid, nitric acid) at a molar ratio of 1:2 to obtain a magnesium salt of a mineral acid. The impurities are removed by purification, subjected to pressure heat treatment in an oxygen atmosphere, washed with water, dehydrated, dried, and heated at 1100 ° C for 1 h to obtain high-purity magnesium oxide.
The magnesium hydroxide calcination method uses the magnesium sulfate solution for purification and purification as a raw material, and the Mg(OH)2 is precipitated by adding pure ammonia water as a precipitant to the magnesium liquid, and the solid-liquid separation is carried out by a plate and frame filter press, and the filter cake is washed high. The purity of Mg(OH)2 is obtained by drying and calcining to obtain high-purity magnesium oxide.
The calcined bituminous powder is subjected to water selection to remove impurities and precipitated into a magnesium slurry, which is then dehydrated to form magnesium oxide by digestion, drying and calcination. Its MgO+H2O→Mg(OH)2Mg(OH)2→MgO+H2O; calcination method
The magnesite is calcined at 950 ° C in a calciner, cooled, sieved, and pulverized to obtain light burned magnesia.
The soda ash method firstly dilutes the bitter brine with water to about 20 °Be and then adds it to the reactor. After stirring, the soda clarified solution of about 20°Be is slowly added, and the reaction is carried out at about 55 ° C to form heavy magnesium carbonate, which is rinsed and centrifuged. The calcination is carried out at 700 to 900 ° C, and the light magnesium oxide product is obtained by pulverization and air separation. It is 5Na2CO3+5MgCl2+6H2O→4MgCO3·Mg(OH)2·5H2O+10NaCl+CO2↑
Fengcheng City Heqi Brucite Mining Co., Ltd., is an imports and exports mining company registered in 1998 in Fengcheng City of Liaoning Province. the company is located in Fengcheng City, Primarily engaged in processing minerals. The company property mainly manufactures magnesium hydroxide flame retardant and brucite powder. The export work is handling by DALIAN HEXIN NEW MATERIAL TECHNOLOGY CO., LTD.
Our annual output amount is up to 100,000 tons. Quality,Integrity, Innovation are our business ideas. Relying on quality products, good services, our company possess good reputation in the line.
"Business Integrity, Standardize Services, Sustainable development, Dedicated to Community" is the company’s Principles. During several years developing, the company possesses own mines and processing plants,It consists of the heqi brucite mine in Fengcheng city (reserves 3,000,000 tons, annual output is 100,000 tons).