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Prepn process of magnesia for silicon steel

A magnesium oxide and silicon steel grade technology, applied in magnesium oxide, manufacturing tools, heat treatment equipment, etc., can solve the problems of long process flow, poor physical properties, and low chemical purity of final products

Active Publication Date: 2008-03-12
山西银海锋源新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a preparation method of silicon steel grade magnesium oxide in order to solve the defects of the existing preparation method of silicon steel grade magnesium oxide such as long process flow, low chemical purity of the final product and poor physical properties.

Method used

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  • Prepn process of magnesia for silicon steel

Examples

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Comparison scheme
Effect test

Embodiment 1

[0067]Dilute the bittern with water to a concentration of 1.0mol / L, heat it to a temperature of 50°C, then add the oxidant sodium hypochlorite in a stirring state, the amount of which is 3% of magnesium chloride, then add 0.2% soda ash, stir for 30 minutes, and filter to obtain Refined magnesium chloride solution. Dissolve soda ash in water, dilute to a concentration of 1.0mol / L, and heat it to a temperature of 50°C to obtain a refined sodium carbonate solution. Add a refined magnesium chloride solution with a volume of V1 and a molar concentration of 1.0 mol / L into the reactor, and add refined carbonic acid with a volume of V2 and a molar concentration of 1.0 mol / L at a rate of 800 L / min under stirring at 500 r / min. Sodium solution, the reaction time is 5min, wherein V1:V2=1.10:1.0, the reaction temperature is maintained at 65°C, and finally basic magnesium carbonate, sodium chloride and water are generated; then the stirring rate is 20r / min, and the time is 1.0h , PH = 9.5,...

Embodiment 2

[0069] Dilute the bittern with water to a concentration of 2.0mol / L, heat it to a temperature of 60°C, then add the oxidant sodium hypochlorite in a stirring state, the amount of which is 3% of magnesium chloride, then add 0.2% soda ash, stir for 30 minutes, and filter to obtain Refined magnesium chloride solution. Dissolve soda ash in water, dilute to a concentration of 2.0mol / L, and heat it to a temperature of 60°C to obtain a refined sodium carbonate solution. Add a refined magnesium chloride solution with a volume of V1 and a molar concentration of 2.0 mol / L into the reactor, and add refined carbonic acid with a volume of V2 and a molar concentration of 2.0 mol / L at a rate of 150 L / min under stirring at 1000 r / min. Sodium solution, the reaction time is 15min, where V1:V2=1.2:1.0, the reaction temperature is maintained at 85°C, and finally basic magnesium carbonate, sodium chloride and water are generated; then the stirring rate is 30r / min, and the time is 2.0h , PH = 10.3...

Embodiment 3

[0071] Dilute bittern with water to a concentration of 1.3 mol / L, heat it to a temperature of 40°C, then add the oxidant sodium hypochlorite in a stirring state, the amount of which is 3% of magnesium chloride, then add 0.2% soda ash, stir for 30 minutes, and filter to obtain Refined magnesium chloride solution. Dissolve soda ash in water, dilute to a concentration of 1.3mol / L, and heat it to a temperature of 40°C to obtain a refined sodium carbonate solution. Add a refined magnesium chloride solution with a volume of V1 and a molar concentration of 1.3mol / L into the reactor, and add refined carbonic acid with a volume of V2 and a molar concentration of 1.3mol / L at a rate of 100L / min under stirring at 600r / min. Sodium solution, the reaction time is 10min, wherein V1:V2=1.05:1.0, the reaction temperature is maintained at 70°C, and finally basic magnesium carbonate, sodium chloride and water are generated; then the stirring rate is 25r / min, and the time is 1.5h , PH = 10, the t...

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Abstract

The present invention relates to preparation process of magnesium compound, and is especially preparation process of magnesia for silicon steel. The present invention produces silicon steel level magnesia through a bittern-sodium carbonate process, which includes reaction of refined magnesium chloride solution and refined sodium carbonate solution at 65-85 deg.c for 5-15 min to produce basic magnesium carbonate, curing, filtering and calcining at 1100+ / -50 deg.c for 2.0+ / -0.5 hr. Thus produced silicon steel level magnesia has high purity, small average grain size, good coating performance, high adhesivity and other features, and the preparation process is simple and low in cost.

Description

technical field [0001] The invention relates to a preparation method of a magnesium compound, in particular to a preparation method of silicon steel grade magnesium oxide specially used for oriented silicon steel sheets. Background technique [0002] As we all know, silicon steel grade magnesia is a white powder, non-toxic and tasteless, which is specially used in the manufacture of grain-oriented silicon steel sheets, and grain-oriented silicon steel sheets are mainly used as iron cores of various transformers. In the manufacturing process of oriented silicon steel sheets, silicon steel grade magnesium oxide is a high-temperature annealing separator between silicon steel sheets, which can form a dense and excellent magnesium silicate insulating film with the surface of silicon steel sheets, and can remove sulfur and phosphorus in silicon steel sheets. and other impurities, reduce the iron loss of silicon steel sheets, improve electrical properties, etc. Silicon steel grade...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/06C21D1/26C21D9/46
Inventor 白世海路庆华范太其
Owner 山西银海锋源新材料有限公司
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