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A kind of preparation method of special magnesia for oriented silicon steel sheet

A technology of oriented silicon steel and magnesium oxide, applied in the direction of magnesium oxide

Active Publication Date: 2011-11-30
上海实业振泰化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With NH4HCO3 as the raw material, the discharge of ammonia will pollute the environment; with Na2CO3 as the Raw materials, the preparation cost is too high; the uniform precipitation method uses MgCl2·6H2O and NH3·H2O is used as raw material to form Mg(OH)2 colloid, which is burned at a certain temperature to obtain the magnesium oxide, but in the whole process of synthesizing magnesium oxide powder, the colloid is difficult to filter , Disadvantages of difficulty in separation and removal of impurities
Thereby above-mentioned method is not suitable for industrialized production described magnesia

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In the first step, the magnesium compound is solid magnesium chloride, which is reacted at 80°C for 15 minutes; in the second step, the drying temperature is 80°C, and the drying time is 2 hours; in the third step, calcined at 1000°C. Dry intermediates of magnesium carbonate and magnesium hydroxide with a calcination time of 2 hours.

[0034] The average particle size of the special magnesia powder for the product oriented silicon steel sheet in this embodiment is between 1 μm and 2 μm.

[0035] The chemical reaction simplified formula relevant to this embodiment:

[0036] 5MgCl 2 +5Na 2 CO 3 +5H 2 O=4MgCO 3 ·Mg(OH) 2 4H 2 O+CO 2 +10NaCl

[0037] 5Mg 2+ +5CO 3 2- +5H 2 O→4MgCO 3 ·Mg(OH) 2 4H 2 O+CO 2

[0038] MgCl 2 +2NaOH=Mg(OH) 2 +2NaCl

[0039] Mg 2+ +2OH - →Mg(OH) 2

[0040] The left side of the above formula shows that the Mg in the magnesium compound aqueous solution +2The mol ratio with the soda ash and caustic soda in the aqueous soluti...

Embodiment 2

[0046] Except for the following differences, all the others are identical to Example 1.

[0047] In the first step, react at 50°C for 22 minutes; in the second step, the drying temperature is 100°C, and the drying time is 1.5 hours; in the third step, the dried magnesium carbonate and hydrogen obtained in the second step are calcined at 900°C An intermediate product of magnesium oxide, the calcination time is 3 hours.

Embodiment 3

[0049] Except for the following differences, all the others are identical to Example 1.

[0050] In the first step, react at 20°C for 30 minutes; in the second step, the drying temperature is 120°C, and the drying time is 1 hour; in the third step, the dried magnesium carbonate and hydrogen obtained in the second step are calcined at 800°C An intermediate product of magnesium oxide, the calcination time is 4 hours.

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Abstract

The invention discloses a method for preparing special magnesia for oriented silicon steel sheet, which belongs to the technical field of special magnesia preparation. Under certain temperature conditions, the magnesium compound aqueous solution reacts with the mixture aqueous solution of soda ash and caustic soda to produce a mixture of intermediate products magnesium carbonate and magnesium hydroxide. After filtering, washing, and drying, it is calcined at high temperature and crushed to obtain a special product for oriented silicon steel sheets. magnesium oxide. The advantages of this method are: easy access to raw materials, low cost, simple production process, low equipment requirements, and easy industrialization; intermediate products are easy to separate and remove impurities, easy to wash, less product washing loss, and high product yield; the product is special magnesium oxide. Powder, the powder has high purity, small particle size, and the average particle size is between 1 μm and 2 μm, with a certain distribution range. The method is especially suitable for preparing special magnesia for oriented silicon steel sheet.

Description

technical field [0001] The invention relates to a method for preparing special magnesia for oriented silicon steel sheets, belonging to the technical field of special magnesia preparation. Background technique [0002] Special magnesia for oriented silicon steel sheet is specially used in the production of oriented silicon steel sheet as a high temperature annealing separator. The main effect of the described magnesium oxide in the high temperature annealing of grain-oriented silicon steel sheet: [0003] 1. Prevent silicon steel sheet steel coil (thickness 0.35mm ~ 0.25mm) from sintering in high temperature (1250°C, 24×7 hours) annealing. [0004] 2. Remove S, P and other impurities in silicon steel sheet and coil. [0005] In high-temperature annealing, the magnesium oxide and the SiO on the surface of the silicon steel sheet 2 reaction to produce Mg 2 SiO 4 The film gives the surface insulation resistance layer and magnetic properties (coercive force) of the silicon ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/02
Inventor 宗俊宗巍
Owner 上海实业振泰化工有限公司
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