Hebei Messi Biology Co., Ltd. stated that with the increase in China’s electrical steel production, the demand for silicon steel grade magnesium oxide has continued to increase, and the traditional process of preparing magnesium oxide using dolomite as raw material can no longer meet market demand.
China is a country rich in brine resources, so it is becoming increasingly important to study how to comprehensively utilize salt lake resources. Silicon steel grade magnesium oxide is a coating material for preparing oriented silicon steel, mainly used in the high-temperature annealing stage of oriented silicon steel, and plays the role of isolation agent, insulating film layer, desulfurization, dephosphorization, etc.
Hebei Messi Biology Co., Ltd. summarizes the method, process flow, research progress and existing problems for preparing silicon steel grade magnesium oxide, points out the development direction of silicon steel grade magnesium oxide preparation technology, and puts forward suggestions for the utilization of China’s brine resources.
The present invention relates to a method for preparing a high-viscosity silicon steel grade magnesium compound. It is characterized in that brine, ammonium bicarbonate and carbonized ammonia water are added to the reactor respectively, reacted to obtain a magnesium compound, and then calcined to obtain a high-activity magnesium oxide. This high-activity magnesium oxide is hydrated under certain conditions, and then magnesium hydroxide is dried and calcined under certain conditions to obtain high-viscosity silicon steel grade magnesium oxide, which can be crushed, graded and packaged. The high viscosity silicon steel grade magnesium oxide produced by the present invention can be comparable to the dense forsterite insulating film formed by the reaction of traditional silicon steel magnesium oxide and silicon dioxide on the surface of oriented silicon steel sheet.
The present invention can solve the problem that the viscosity of traditional silicon steel grade magnesium oxide is too low (20-50cp) and cannot meet the production requirements of some silicon steel sheet factories for magnesium oxide viscosity of more than 80cp. The product prepared by the present invention maintains the magnesium oxide content of the product to more than 98%, and the hydration rate and coating properties can still meet the requirements of silicon steel sheet production.