The specific use of Magnesium oxide in silicon steel After decarburization of oriented silicon steel in a continuous furnace the upper and lower surface of the strip should be uniformly coated with magnesium oxide coating solution.
Magnesium oxide mainly plays the role of isolating agent, in order to prevent the adhesion of strip steel in high temperature annealing stage, at the same time can remove the nitrogen, sulfur and other impurities in the steel, in addition to the silicon dioxide reaction with the surface of silicon steel, form a good magnesium silicate insulation bottom.
Therefore, the coating quality of magnesium oxide coating solution on the surface of oriented silicon steel plays an important role in the quality of silicon steel products.
At present, magnesium oxide coating is carried out by a two-roller coating machine.
The two-roller coating machine comprises an upper coating roller, a lower coating roller, a tray, a magnesium oxide coating circulating device, and a nozzle spraying the magnesium oxide coating liquid in the coating circulating device to the upper surface of the strip;
The lower coating roller is immersed in the tray, and the nozzle is sprayed onto the upper surface of the strip after the magnesium oxide coating liquid overflows into the tray. The lower coating roller USES the magnesium oxide coating liquid in the tray to coat the lower surface of the strip.
However, due to the poor flow of magnesium oxide solution in the tray during the coating cycle, magnesium oxide reacts with water to form magnesium hydroxide precipitation, and magnesium hydroxide combines with carbon dioxide in the air to form magnesium carbonate which is easy to precipitate.
Magnesium carbonate and magnesium hydroxide have poor fluidity and are prone to agglomerate deposition.
Therefore, the tray coating fluid fluidity is not high, as time goes by, coating fluid is easy to produce accumulation and scale, resulting in poor coating quality of the lower coating roller, along the strip rolling to the plate surface batch appears wide and narrow, the number of different double lines, and wear the lower coating roller, directly resulting in product quality defects.
In severe cases, it is necessary to stop the machine to replace the coating roller, clean up the circulation of clogged pipes, and deal with the scaling of the tray.
On the one hand, these unfavorable factors greatly increase the labor intensity of workers; on the other hand, they interfere with the on-site continuous production and directly affect the production efficiency. At the same time, because the solidified magnesium oxide coating solution is stuck in the tray and cannot be used, it is not only difficult to clean, but also causes waste of magnesium oxide.
In addition, due to the liquid dumping at the edge of the coating roller, the coating quality is affected and the work of the coating machine is disturbed, resulting in scale accumulation at the edge of the coating roller and uneven coating at the edge of the strip.
Meishen is the world's leading producer of magnesium oxide, Magnesium oxide 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 is white or light yellow powder, odorless, tasteless, this product is insoluble in water and ethanol, melting point 2852 ° C, boiling point 3600 ° C, magnesium oxide has high refractory insulation properties. It can be converted into crystal by burning at a temperature above 1000 ° C. If it rises above 1500 ° C, it will form a burnt magnesia or sintered magnesia.
Magnesium oxide can be used in the manufacture of metallurgy, smelting, advanced magnesia bricks, refractory materials and moisturizing materials. It is also widely used in rubber, rubber sheet, rubber products, pharmaceutical industry, food industry, plastic sheet accelerator, glass fiber reinforced plastics and Surface coating of silicon steel sheet, paper production, steel ball polishing, leather treatment, insulation materials, grease, dyes, ceramics, desiccant, resin, flame retardant, etc.
Hebei Meishen Chemical Technology Group is the main magnesium oxide producer in the world. It is also the largest magnesium salt producer in China and has won the ISO9002 quality system certification. It also has GMP-Certification.
With rich experience in the research, development, production, management and operation of magnesium oxide products, Meishen Group has always attached great importance to the research and development of new products and strict requirements on product quality. Meishen has a high-level sales team. The business covers more than 20 countries and regions around the world. It is widely welcomed by new and old customers.
Meishen has a high-level sales team. The business covers more than 20 countries and regions around the world. It is widely welcomed by new and old customers.