Hebei Messi Biology Co., Ltd. stated that with the expansion of production lines of major domestic steel mills, the output of oriented silicon steel has continued to increase. Silicon steel grade magnesium oxide, as an important insulating coating material for the production of oriented silicon steel sheets, also faces important opportunities and challenges. Through preparation research and development in recent years, the preparation technology and product quality of silicon steel grade magnesium oxide in my country have been greatly improved, but further breakthroughs are still needed in both quality and quantity.
Globally, most high-end magnesium oxide products use seawater brine as raw material. Seawater brine contains fewer impurities, and the raw material impurity removal process is relatively simple, which has obvious technical advantages in the production of high-grade magnesium oxide. my country has abundant concentrated seawater brine resources, and the magnesium salt reserves in salt lake brine alone are as high as 4.816 billion tons. In addition, industries such as seawater desalination, seawater salt production, and salt lake potassium extraction also produce tens of millions of tons of concentrated seawater rich in magnesium ions every year. Using my country’s abundant concentrated seawater and brine as raw materials to produce silicon steel grade magnesium oxide has great advantages.
In the preparation method using concentrated seawater brine as raw material, due to the poor filtration performance of magnesium hydroxide intermediates, in contrast, the brine carbon ammonium method using ammonium carbonate or ammonium bicarbonate as precipitant has more competitive advantages and will become a trend in the development of the industry. In the future, in the preparation of silicon steel-grade magnesium oxide using the brine carbon ammonium method, we must increase technical research and development, further reduce costs and energy consumption, reasonably recycle the tail liquid ammonium chloride, reduce emission pollution, and pay attention to improving product quality. It is not limited to meeting quality indicators, but also needs to be further strengthened in terms of purity and morphology control to obtain high-quality and highly applicable products, so that my country’s silicon steel-grade magnesium oxide products can meet domestic market demand while having the ability to compete in the international market.