Hebei Messi Biology Co., Ltd. stated that silicon steel grade magnesium oxide is a magnesium oxide coating material used to manufacture oriented silicon steel sheets and is a high value-added magnesium oxide product. At present, the United States and Japan are at the forefront of the research and preparation of silicon steel grade magnesium oxide. my country’s research on silicon steel grade magnesium oxide started late. It was not until 1988 that a production line with an annual output of 200t of silicon steel grade magnesium oxide was built to replace Japanese imported products for the production of oriented silicon steel in Wuhan Iron and Steel. After years of development, although my country has become a major exporter of magnesium oxide, the special magnesium oxide industry generally has a small production scale, unstable product quality, low automation and refinement levels, and silicon steel grade magnesium oxide is still not self-sufficient. In 2008, the demand for silicon steel grade high-purity magnesium oxide by domestic enterprises was 100,000 tons, while the domestic output was about 1,000 tons, far from meeting the needs of enterprises.
At present, my country has overcome the technical difficulties in the production of oriented silicon steel. Large enterprises such as Wuhan Iron and Steel, Baosteel, and Anshan Iron and Steel have built new oriented silicon steel production lines. Therefore, the market potential of silicon steel grade magnesium oxide is huge, and it is necessary to strengthen the research on the preparation technology of silicon steel grade magnesium oxide. The name of silicon steel grade magnesium oxide actually indicates its use, that is, magnesium oxide suitable for the manufacture of oriented silicon steel sheets. It has special qualities:
1) It has high chemical purity, generally requiring w(Mg0)≥98%;
2) It has good suspension performance in water and is convenient for coating;
2) It has a low hydration rate, reduces annealing time, drainage time and the generation of iron oxides, which is an important indicator for measuring silicon steel grade magnesium oxide:
3) It has a certain activity:
4) It has strong adhesion to the surface of silicon steel sheets. It is a high-temperature annealing isolation agent, insulating coating generator, dephosphorization agent and desulfurization agent in the manufacturing process of silicon steel sheets. It can also be used for advanced sealing ceramics, refractory crucibles, special polishing agents, etc.
China’s silicon steel grade magnesium oxide was successfully developed by East China Normal University in 1988, and industrialized production was achieved through cooperation. It has been used in the production of oriented silicon steel sheets of Wuhan Iron and Steel Corporation for a long time, replacing imported products from Japan. The product’s magnesium oxide content and hydration rate are better than those of Japanese products, changing the situation in which Wuhan Iron and Steel Corporation had long relied on imports of major chemical raw materials after introducing the 1.7m rolling mill. In 1999, the second generation of silicon steel magnesium oxide was successfully developed to meet the needs of Wuhan Iron and Steel Corporation’s oriented silicon steel sheet production to develop into a thin series. In order to improve electromagnetic properties and improve silicon steel performance grades, the third generation of silicon steel magnesium oxide is being developed. At present, Anshan Iron and Steel Corporation and Baosteel Corporation of China are preparing to build new silicon steel production lines, and the demand for silicon steel grade magnesium oxide is increasing, which has attracted the attention of industry insiders.