Method for preparing high-viscosity silicon-steel grade magnesium oxide

Abstract

The invention provides a method for preparing a high-viscosity silicon-steel grade magnesium compound. The method is characterized in that brine, ammonium hydrogen carbonate and carbonated aqueous ammonia are added into a reactor respectively, and react to obtain a magnesium compound; the magnesium compound is calcined to obtain high activity magnesium oxide; the high activity magnesium oxide is hydrated under a certain condition; magnesium hydrate is dried and calcined under a certain condition to obtain high-viscosity silicon-steel grade magnesium; and the high-viscosity silicon-steel grademagnesium are crushed and packaged in grade. The performance of the high-viscosity silicon-steel grade magnesium compound produced by the method can be comparable with a compact forsterite type insulating film formed by reacting the conventional silicon-steel magnesium oxide and silicon dioxide on the surface of a grain-oriented silicon steel sheet. The method can solve the problem that the priorsilicon-steel grade magnesium oxide has lower viscosity (20-50 cp), and cannot adapt to the production requirement of partial silicon-steel sheet factories on the magnesium oxide with over 80 cp viscosity. The product prepared by the method maintains the content of the MgO in the product over 98 percent, and has hydration ratio and screening characteristic which still can meet the requirement of producing the silicon-steel sheet.

Description

technical field [0001] The invention relates to a preparation method of a magnesium compound, in particular to a preparation method of high-viscosity silicon steel grade magnesium oxide. It belongs to the field of silicon steel grade magnesium oxide. Background technique [0002] With the continuous advancement of science and technology and the continuous development of silicon steel sheet production technology, different silicon steel sheet factories have different viscosity requirements for magnesium oxide required for the production of silicon steel sheet. Domestic customers, such as Wuhan Iron and Steel Company (WISCO), require silicon steel grade magnesium oxide to have a viscosity below 50cp, but some foreign customers require silicon steel grade magnesium oxide to have a higher viscosity to adapt to their different technological processes from domestic customers; traditional high viscosity magnesium oxide The magnesium content is low, the hydration rate is high, and ...

AI Technical Summary

Problems solved by technology

Predecessors have summed up a lot of methods for preparing magnesium oxide from brine, such as brine-ammonia method, brine-alkali method, brine-ammonium bicarbonate method, etc. Although these processes are simple, there are problems such as raw material utilization rate Low, high production costs, low magnesium content in products, etc., so it is particularly important to study a method of high efficiency and energy saving

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