A kind of preparation method of silicon steel grade magnesia

A magnesia, silicon steel grade technology, applied in magnesia and other directions, can solve the problems of magnesia multiple quality defects, product quality fluctuations, low reaction temperature, etc., achieve uniform particle size distribution, improve automation level, low impurity content Effect

Active Publication Date: 2017-02-01
上海实业振泰化工有限公司
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Problems solved by technology

[0003] The magnesium oxide produced by the general continuous process has many quality defects and cannot be used as a raw material for grain-oriented silicon steel.
In the traditional production process of silicon steel grade magnesium oxide, most of them use conventional reactors for production and preparation of semi-finished products, which have disadvantages such as low reaction temperature, difficult process control and discontinuous production process, resulting in large fluctuations in the quality of the produced products , there is a big gap with the international advanced production technology level, and it cannot meet the strict requirements of some demanding customers

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  • A kind of preparation method of silicon steel grade magnesia

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Embodiment Construction

[0028] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention will be further elaborated below.

[0029] A preparation method of silicon steel grade magnesium oxide, comprising the steps of:

[0030] 1) Ingredients removal: Put the crude magnesium oxide powder into a container, add pure water for preparation, and wash the prepared slurry to remove impurities. The container can use equipment such as ultrasonic or dispersing mill. In order to achieve the effect of uniform dispersion of powder in water, a high-speed mixer is preferably used.

[0031] 2) Rotating bed high temperature treatment: pump the slurry obtained in step 1) into a rotating bed reactor for reaction to obtain slurry. The rotating bed reactor works by heating with superheated steam. The temperature of the steam fed into the rotary reactor is 100°C-140°C, the discharge temperature is 35°C-85°C, and the rotating...

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Abstract

The invention relates to the technical field of magnesium oxide production, and concretely relates to a preparation method of magnesium oxide. The method comprises the following steps: 1)placing the crude magnesium oxide powder in a container, adding pure water for blending, washing a blended slurry to remove impurities, 2)pumping the slurry into a revolving bed reactor for reacting to obtain a slip, 3)aging the slip and separating to obtain magnesium hydroxide, drying, and 4)placing magnesium hydroxide in a high temperature calciner, employing a dynamic calcining method for calcining to obtain the magnesium oxide particles, and crushing and grading to obtain the silicon-steel grade magnesium oxide. Compared with a traditional silicon-steel grade magnesium oxide, the silicon-steel grade magnesium oxide produced by the invention has the advantages of low impurity content, uniform and adjustable particle size particle size distribution, low hydration rate, good suspensibility and stable quality.

Description

technical field [0001] The invention relates to the technical field of magnesium oxide production, in particular to a method for preparing magnesium oxide used in the production of silicon steel sheets. Background technique [0002] Magnesium oxide for silicon steel grade is mainly used in the production of grain oriented silicon steel sheet. In high temperature environment, magnesium oxide is firstly used as an annealing agent for steel sheets to prevent steel sheets from bonding. At the same time, magnesium oxide should form an excellent insulating film on the surface of silicon steel sheets and the substrate, and can also remove sulfur in silicon steel during high temperature reactions. and phosphorus and other harmful impurities. [0003] The magnesium oxide produced by the general continuous process has many quality defects and cannot be used as a raw material for grain-oriented silicon steel. In the traditional production process of silicon steel grade magnesium oxid...

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C01F5/02
CPCC01F5/02
Inventor傅涛宗俊武艳妮徐艳霞
Owner上海实业振泰化工有限公司