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A kind of production method of electrical grade magnesium oxide powder

A technology of magnesium oxide powder and production method, which is applied in the direction of metal oxides, circuits, electrical components, etc., can solve the problems of high moisture absorption rate and hydration rate, leakage, and serious problems of electrical grade magnesium oxide, so as to improve the moisture-proof effect and prevent leakage Effect of current reduction and product quality improvement

Active Publication Date: 2019-12-17
营口松辽镁业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the magnesia prepared by the present invention greatly improves the thermal withstand voltage of electrical grade high temperature magnesia and improves the product quality of electric heating and electrical components, the prepared electrical grade magnesia has a large moisture absorption rate and hydration rate, and serious leakage phenomenon

Method used

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  • A kind of production method of electrical grade magnesium oxide powder
  • A kind of production method of electrical grade magnesium oxide powder
  • A kind of production method of electrical grade magnesium oxide powder

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preparation example Construction

[0060] According to an embodiment of the present invention, the preparation method of the inorganic filler includes: crushing the serpentine and kaolin separately, sieving to make a 40-325 mesh powder, mixing according to the ratio of 1:2, and then placing it in a box-type high-temperature furnace Roast at 900°C for 3 hours, then cool to room temperature after coming out of the furnace, and it will be an inorganic filler;

[0061] According to another embodiment of the present invention, the preparation method of the inorganic filler comprises: first placing the serpentine in a ladle, heating it with a three-phase electric arc, melting it at 1950-2150°C, and keeping it warm for 3-5 hours, After natural cooling, it is separated and crushed, and then mixed with calcined kaolin to prepare inorganic fillers. In the molten state, the layered crystal structure in the serpentine is changed, so that after the melt is cooled, the Fe element in the serpentine can be removed quickly and ...

Embodiment 1

[0097] A production method of electrical grade magnesium oxide powder: comprising the following steps:

[0098] (1) Pulverize the fused magnesium block, and sieve it into magnesium oxide powder with a particle size of 40-325 mesh;

[0099] (2) Step (1) magnesium oxide powder and sodium hydroxide solution (concentration is 10.0mol / L) are 600 with mass volume ratio (g / L), drop in alkali washing-washing still 1 and carry out alkali washing, pre-normal temperature Wash with alkali for 50 minutes, filter the alkali washing solution to obtain a precipitate, and wash the precipitate with water several times until the pH value is 6.9;

[0100] (3) drying the magnesium oxide powder obtained in step (2) in a rotary furnace at 400-500° C. for 45 minutes;

[0101] (4) Pulverize the inorganic filler, sieve to make 40-325 mesh powder, mix the magnesium oxide powder obtained in step (3) and the inorganic filler in a weight ratio of 100:1, and stir the mixture in a mixer for 15 minutes Amon...

Embodiment 2

[0106] A production method of electrical grade magnesium oxide powder: comprising the following steps:

[0107] (1) Pulverize the fused magnesium block, and sieve it into magnesium oxide powder with a particle size of 40-325 mesh;

[0108] (2) Step (1) magnesium oxide powder and sodium hydroxide solution (concentration is 6.0mol / L) are 900 with mass volume ratio (g / L), drop into alkali washing-washing still 1 and carry out alkali washing, pre-normal temperature Wash with alkali for 40 minutes, filter the alkali washing solution to obtain a precipitate, and wash the precipitate with water several times until the pH value is 7.3;

[0109] (3) drying the magnesium oxide powder obtained in step (2) in a rotary furnace at 400-500° C. for 30 minutes;

[0110] (4) Pulverize the inorganic filler, sieve to make 40-325 mesh powder, mix the magnesium oxide powder obtained in step (3) and the inorganic filler in a weight ratio of 100:1.5, and stir the mixture in a mixer for 20 minutes A...

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Abstract

The invention provides a production method of electrical grade magnesium oxide powder. Particularly the method comprises the following steps of crushing fused magnesia blocks, performing screening and alkali treatment; drying; adding an inorganic filler which is composed of ophiolite and kaolin, and mixing to uniform; performing screening and demagnetization; and spraying silicone oil on the surface of magnesium oxide powder in a spraying manner for obtaining the electrical grade magnesium oxide powder. The electrical grade magnesium oxide powder prepared according to the production method has advantages of improving electric insulating performance, greatly reducing leakage current, greatly increasing thermal-state withstand voltage, realizing no peak value in energization, realizing no blackening or carbonization of the magnesium oxide powder, and greatly improving product quality of an electric heating tube.

Description

technical field [0001] The invention relates to the technical field of magnesium oxide production, in particular to a production method of electrical grade magnesium oxide powder. Background technique [0002] The main uses of fused magnesia: first, it is refractory material; second, it is to make electrical grade magnesium oxide powder. Electrical grade magnesium oxide powder has excellent electrical insulation and thermal conductivity properties, and is mainly used to make electric heating elements. Electrical grade magnesia powder produced by fused magnesia sand after a series of physical and chemical treatments is widely used as insulating filling material for electric heating elements. [0003] Among them, there are many factors that affect the performance of electrical grade magnesium oxide powder. Thermal conductivity, dielectric strength, compressive strength, moisture absorption rate, hydration rate, and trace element content are all important indicators that deter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B3/02H01B3/10H01B7/282H01B7/29H01B19/00H01B19/02H01B19/04
CPCH01B3/025H01B3/10H01B7/282H01B7/29H01B19/00H01B19/02H01B19/04
Inventor 杜永平季克捷
Owner 营口松辽镁业有限公司
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