Messi Biology said, with the increase of electrical steel production in China, the demand of silicon steel grade magnesium oxide is increasing, the traditional process of preparing magnesium oxide from dolomite is unable to meet the market demand. China is a country rich in brine resources, therefore, it becomes more and more important to study how to resourcefully and comprehensively utilize the salt lake resources. The silicon steel grade magnesium oxide is a kind of coating material for the preparation of oriented silicon steel, mainly used in the high temperature annealing treatment stage of oriented silicon steel, playing the role of isolating agent, insulating film layer, desulfurization, dephosphorization, etc. Messi Biology reviewed the methods, process flow, research progress and problems in the preparation of silicon steel grade magnesium oxide, pointed out the development direction of silicon steel grade magnesium oxide preparation technology, and made suggestions on the utilization of brine resources in China.
The present invention relates to a method of preparing a high viscosity silicon steel grade magnesium compound. It is characterized by adding brine, ammonium bicarbonate and ammonia carbide into the reactor respectively, reacting to get magnesium compound, and then calcining to get high active magnesium oxide. This high activity magnesium oxide hydrated under certain conditions, and then dry calcined magnesium hydroxide under certain conditions to get high viscosity silicon steel grade magnesium oxide, crushed and graded packaging can be. The performance of high viscosity silicon steel grade magnesium oxide produced by this invention can be comparable with the traditional silicon steel magnesium oxide and the reaction of silicon dioxide on the surface of oriented silicon steel sheet to form a dense magnesium olivine type insulating film.
The invention can solve the traditional silicon steel grade magnesium oxide viscosity is low (20~50cp), can not adapt to some silicon steel sheet factory for magnesium oxide viscosity of more than 80cp production needs. The product prepared by this invention can keep the content of magnesium oxide above 98%, and the hydration rate and coating property can still meet the requirement of silicon steel sheet production.
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