Specific use of magnesium oxide in silicon steel After oriented silicon steel is decarburized and annealed in a continuous furnace, it is necessary to uniformly coat the upper surface and the lower surface of the strip steel with a magnesium oxide coating solution. Magnesium oxide mainly acts as a release agent to prevent the strip from sticking during the high-temperature annealing stage, and at the same time, it can remove impurities such as nitrogen and sulfur in the steel. In addition, it also reacts with the silicon dioxide on the surface of the silicon steel to form an excellent magnesium silicate insulating underlayer . Therefore, the coating quality of magnesium oxide coating liquid on the surface of oriented silicon steel plays a vital role in the quality of silicon steel products. At present, the magnesium oxide coating liquid is coated by a two-roll coater.
The two-roll coating machine includes an upper coating roller, a lower coating roller, a tray, a magnesium oxide coating liquid circulating device, and a nozzle that sprays the magnesium oxide coating liquid in the magnesium oxide coating liquid circulating device to the upper surface of the strip steel The undercoating roller is immersed in the tray, and the magnesium oxide coating liquid sprayed by the nozzle on the upper surface of the strip overflows and enters the tray. The undercoating roller uses the magnesium oxide coating liquid in the tray for the lower surface of the strip Of coating. However, due to the magnesium oxide coating liquid in the process of coating and recycling, the magnesium oxide solution in the tray does not flow smoothly, and the magnesium oxide reacts with water to form magnesium hydroxide precipitates. The magnesium hydroxide combines with carbon dioxide in the air to form easily precipitated Magnesium carbonate.
Magnesium carbonate and magnesium hydroxide have poor fluidity and are prone to agglomeration and deposition. Therefore, the fluidity of the coating liquid in the tray is not high. As time goes by, the coating liquid is easy to accumulate and scale, resulting in poor coating quality of the lower coating roller, and the batches of different widths and quantities appear along the strip rolling to the plate surface. Double lines and abrasion of the lower coating roller directly cause product quality defects. In severe cases, it is necessary to stop the machine to replace the coated roller, clean the blockage of the circulation pipe, and deal with the scale of the tray. On the one hand, these unfavorable factors greatly increase the labor intensity of the employees, on the other hand, they interfere with the continuous production on the spot, which directly affects the production efficiency. At the same time, the cured magnesium oxide coating solution cannot be used in the tray, which is not only difficult to clean. , But also cause waste of magnesium oxide. In addition, due to liquid slinging at the edge of the coating roller, the coating quality is affected, and the work of the coating machine is disturbed at the same time, resulting in fouling on the edge of the coating roller and uneven coating of the strip edge.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.
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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.