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Preparation method of silicon-steel-level magnesium oxide coating

A technology of magnesium oxide and silicon steel grade, which is applied in the field of preparation of magnesium compounds, can solve the problems of long process flow, poor physical properties, and low chemical purity, and achieve high chemical purity, low hydration rate, and good suspension.

Inactive Publication Date: 2013-08-21
抚顺博达节能环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the purpose of the present invention is to provide a method for preparing a silicon steel grade magnesium oxide coating, which solves the defects of the existing silicon steel grade magnesium oxide preparation method, such as long process flow, low chemical purity of the final product, and poor physical properties.

Method used

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  • Preparation method of silicon-steel-level magnesium oxide coating

Examples

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Comparison scheme
Effect test

Embodiment 1

[0009] Example 1: Select natural aphanitic magnesite to produce light-burned magnesia powder; digest light-burned magnesia, neutralize and decalcify with acid and alkali, react at a temperature of 15°C for 5 minutes to generate hydrogen oxide Magnesium, then washed with water, filtered, dried, and then calcined at a temperature of 1050°C for 1.5 hours to obtain high-purity light-burned magnesium oxide powder; processed into the required micron-sized particle size segment by jet milling.

Embodiment 2

[0010] Example 2: Select natural aphanitic magnesite to produce light-burned magnesia powder; digest light-burned magnesia, neutralize and decalcify with acid and alkali, react at a temperature of 20°C for 10 minutes to generate hydrogen oxide Magnesium, then washed with water, filtered, dried, and then calcined at a temperature of 1100°C for 2.0 hours to obtain high-purity light-burned magnesium oxide powder; processed into the required micron-sized particle size segment by jet mill.

Embodiment 3

[0011] Example 3: Select natural aphanitic magnesite to produce light-burned magnesia powder; digest the light-burned magnesia, neutralize and decalcify with acid and alkali, react at a temperature of 30°C for 15 minutes to generate hydrogen oxide Magnesium, then washed with water, filtered, dried, and then calcined at a temperature of 1150°C for 2.5 hours to obtain high-purity light-burned magnesium oxide powder; processed into the required micron-sized particle size segment by jet milling.

[0012] Through practice, its technical index of the silicon steel grade magnesia coating that the inventive method is made is as shown in table 1:

[0013] Table 1 technical indicators

[0014]

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Abstract

The invention discloses a preparation method of silicon-steel-level magnesium oxide coating especially for oriented silicon steel plates. The preparation method comprises selecting natural aphanitic magnesite to produce lightly-calcined magnesia powder; digesting the lightly-calcined magnesia, performing acid-base neutralization to remove calcium, reacting for 5-15 minutes at 15-30 DEG C to generate magnesium hydroxide, washing with water, filtering, drying, calcining for 2.0 + / - 0.5 hours under a temperature of 1100 + / - 50 DEG C to obtain the high-purity lightly-calcined magnesia powder; and processing the powder into desired micron-level particle sizes by using a jet mill. The silicon-steel-level magnesium oxide coating provided by the invention has characteristics of high chemical purity, low impurity ions, good suspension, low hydration rate, and good coating and adhesion, has physical properties far better than those of similar products, is a good annealing isolation agent for producing the oriented silicon steel plates and also simple in production operation, and can greatly reduce production cost.

Description

technical field [0001] The invention relates to a preparation method of a magnesium compound, in particular to a preparation method of a silicon steel grade magnesium oxide coating specially used for oriented silicon steel sheets. Background technique [0002] Silicon steel grade magnesium oxide coating is specially used as high temperature annealing separator in the preparation process of grain oriented silicon steel sheet. The main function of the silicon steel grade magnesium oxide coating in the high temperature annealing of the oriented silicon steel sheet is to prevent the sintering of the silicon steel sheet coil during the high temperature annealing, and to remove the sulfur, phosphorus and other impurities in the silicon steel sheet. According to the survey, the market demand of high-purity magnesia in my country is nearly 100,000 tons, but there are few domestic products, and the gap is quite large, which provides opportunities and favorable conditions for the prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/10
Inventor 孙光
Owner 抚顺博达节能环保科技有限公司
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