Method for preparing magnesium oxide for high-performance silicon steel through dolomite

A magnesia and dolomite technology, applied in the field of oriented silicon steel sheet manufacturing, can solve the problems of unstable product quality, high production cost, difficult technical communication, etc., and achieve the effects of low cost, no three-waste pollution, and simple production process

Active Publication Date: 2016-01-27
山西银圣科技有限公司
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of unstable product quality, high production cost and difficult technical exchange in the manufacture of high-performance oriented silicon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method for preparing magnesium oxide for high-performance silicon steel from dolomite, comprising the following process steps:

[0028] (1) Calcination of dolomite: Dolomite is calcined at 900°C in a shaft kiln to obtain a mixture of magnesium oxide and calcium oxide;

[0029] (2) Hydration: Mix the mixture of magnesium oxide and calcium oxide with water in the ash tank at a mass ratio of 1:10, and carry out hydration reaction at 60°C to obtain magnesium hydroxide and calcium hydroxide through hydration reaction;

[0030] (3) Carbonization: Pass the purified carbon dioxide with a concentration of 28% into the carbonization tower, and put the magnesium hydroxide and calcium hydroxide turbid liquid in the carbonization tower in advance for carbonization. The carbonization pressure is 0.25MPa, and the carbonization temperature is At 25°C, the products are solid calcium carbonate and liquid magnesium bicarbonate;

[0031] (4) Filtration: Filtrate with a plate...

Embodiment 2

[0039] A preparation method for preparing magnesium oxide for high-performance silicon steel from dolomite, comprising the following process steps:

[0040] (1) Calcination of dolomite: Dolomite is calcined at 920°C in a shaft kiln to obtain a mixture of magnesium oxide and calcium oxide;

[0041] (2) Hydration: Mix the mixture of magnesium oxide and calcium oxide with water at a mass ratio of 1:11 in the ash tank, and carry out hydration reaction at a temperature of 64°C to obtain magnesium hydroxide and calcium hydroxide through the hydration reaction;

[0042] (3) Carbonization: Pass the purified carbon dioxide with a concentration of 30% into the carbonization tower, and put the magnesium hydroxide and calcium hydroxide turbid liquid in the carbonization tower in advance for carbonization. The carbonization pressure is 0.27MPa, and the carbonization temperature is At 28°C, the products are solid calcium carbonate and liquid magnesium bicarbonate;

[0043] (4) Filtration: ...

Embodiment 3

[0051] A preparation method for preparing magnesium oxide for high-performance silicon steel from dolomite, comprising the following process steps:

[0052] (1) Calcination of dolomite: Dolomite is calcined at 940°C in a shaft kiln to obtain a mixture of magnesium oxide and calcium oxide;

[0053] (2) Hydration: Mix the mixture of magnesium oxide and calcium oxide with water at a mass ratio of 1:12 in the ash tank, and carry out hydration reaction at a temperature of 68°C to obtain magnesium hydroxide and calcium hydroxide through the hydration reaction;

[0054](3) Carbonization: Pass the purified carbon dioxide with a concentration of 32% into the carbonization tower, and put the magnesium hydroxide and calcium hydroxide turbid liquid in the carbonization tower in advance for carbonization. The carbonization pressure is 0.29MPa, and the carbonization temperature is At 31°C, the products are solid calcium carbonate and liquid magnesium bicarbonate;

[0055] (4) Filtration: F...

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PUM

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Abstract

The invention relates to the field of orientation silicon steel manufacturing, in particular to a method for preparing magnesium oxide for high-performance silicon steel through dolomite. The problems that in the existing orientation silicon steel manufacturing process, magnesium oxide for silicon steel is prepared through a bittern method, adhesiveness is poor, the magnetic flux density is low, insulation film bottom layer concession is high are solved. The method comprises the steps that firstly, dolomite is roasted, subjected to chemical combination with water and then carbonized in a carbonizing tower; secondly, solid calcium carbonate and a magnesium bicarbonate aqueous solution are filtered and separated, the obtained magnesium bicarbonate aqueous solution is pyrolyzed and filtered, magnesium carbonate is obtained, then subjected to multi-step calcination, smashed through air flow and packaged, and magnesium oxide for the high-performance silicon steel is obtained. According to the method, the production process is unique, cost is low, three wastes are not generated, the adhesiveness, electromagnetic performance and grade rate of the orientation silicon steel can be remarkably improved, and the method can be applied and popularized in orientation silicon steel factories on a large scale.

Description

technical field [0001] The invention relates to the field of manufacturing oriented silicon steel sheets, in particular to a method for preparing magnesia for high-performance silicon steel from dolomite. Background technique [0002] In the manufacturing process of high-performance grain-oriented silicon steel sheet, in addition to using beneficial additives, the most important thing is to use magnesium oxide for high-performance silicon steel. It is currently a high-temperature annealing release agent and insulating coating forming agent in the production of high-performance oriented silicon steel sheet (Hi-B). Silicon in silicon steel forms forsterite film (reaction formula 2MgO+SiO 2 →Mg 2 SiO 4 ), the forsterite film not only has high electrical insulation, but also the difference in expansion rate between the forsterite film and the silicon steel sheet substrate imparts tension to the surface of the silicon steel sheet, has a Gaussian structure, refines the magnetic...

Claims

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Application Information

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IPC IPC(8): C04B2/12
Inventor 白锋张忠慧郁建强郭毅
Owner 山西银圣科技有限公司
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