Preparation method of special magnesium oxide for grain-oriented silicon steel sheet

A technology of oriented silicon steel and magnesium oxide, applied in the direction of magnesium oxide, etc., can solve problems such as unsuitable for industrial production of magnesium oxide, difficulty in separation and removal of impurities, and difficulty in filtering colloids, and achieves low cost, simple production process, and small particle size.

Active Publication Date: 2010-02-10
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

[0032] In the first step, the magnesium compound is solid magnesium chloride, 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, the second step is calcined at 1000°C. The intermediate product of dried magnesium carbonate and magnesium hydroxide has a calcination time of 2 hours.

[0033] The average particle size of the special magnesium oxide powder for the oriented silicon steel sheet product of this embodiment is between 1 μm and 2 μm.

[0034] The chemical reaction formula related to this embodiment:

[0035] 5MgCl 2 +5Na 2 CO 3 +5H 2 O=4MgCO 3 ·Mg(OH) 2 ·4H 2 O+CO 2 +10NaCl

[0036] 5Mg 2+ +5CO 3 2- +5H 2 O→4MgCO 3 ·Mg(OH) 2 ·4H 2 O+CO 2

[0037] MgCl 2 +2NaOH=Mg(OH) 2 +2NaCl

[0038] Mg 2+ +2OH - →Mg(OH) 2

[0039] The left side of the above formula shows that Mg in aqueous solution of magnesium compound +2 The molar ratio of soda ash and caustic soda in the aqueous solution of the mixture of soda ...

Embodiment 2

[0045] Except for the following differences, everything else is exactly the same as in Example 1.

[0046] In the first step, the reaction was carried out at 50°C for 22 minutes; in the second step, the drying temperature was 100°C and the drying time was 1.5 hours; in the third step, the dried magnesium carbonate and hydrogen prepared in the second step were calcined at 900°C The intermediate product of magnesium oxide has a calcination time of 3 hours.

Embodiment 3

[0048] Except for the following differences, everything else is exactly the same as in Example 1.

[0049] 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 produced in the second step are calcined at 800°C The intermediate product of magnesium oxide has a calcination time of 4 hours.

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Abstract

The invention relates to a preparation method of special magnesium oxide for grain-oriented silicon steel sheet, belonging to the technical field of the preparation special magnesium oxide. The methodcomprises the following steps: reacting magnesium compound solution with the mixed solution of sodium carbonate and sodium hydroxide at a temperature to prepare a mixture of intermediate product containing magnesium carbonate and magnesium hydroxide, filtrating, washing, drying, calcining at high temperature, and grinding to obtain the special magnesium oxide for grain-oriented silicon steel sheet. The method has the advantages that the raw material is accessible, the cost is low, the production process is simple, the facility request is low, the method is applicable to industrialized production; the intermediate product is easy for separation and purification and is easy to wash, the washing loss of the product is low, the product yield is high; the product is special magnesium oxide powder, the powder has high purity, the grain size is small, and the average grain size is 1-2mu m and has a certain distribution range. The method is especially suitable for the preparation of special magnesium oxide for grain-oriented silicon steel sheet.

Description

Technical field [0001] The invention relates to a preparation method of special magnesium oxide for oriented silicon steel sheets, and belongs to the technical field of preparation of special magnesium oxide. Background technique [0002] The special magnesium oxide for oriented silicon steel sheet is specially used in the production of oriented silicon steel sheet as a high-temperature annealing separator. The main function of magnesium oxide in high temperature annealing of oriented silicon steel sheet: [0003] 1. Prevent silicon steel sheet steel coil (sheet thickness 0.35mm ~ 0.25mm) from sintering during high temperature (1250℃, 24×7 hours) annealing. [0004] 2. Remove S, P and other impurities in the silicon steel sheet steel coil. [0005] In high temperature annealing, the magnesium oxide and SiO on the surface of the silicon steel sheet 2 Reaction to generate Mg 2 SiO 4 The film gives the surface of the silicon steel sheet an insulating resistance layer and magnetic proper...

Claims

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Application Information

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Patent Type & Authority Applications(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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