Preparation method of extruded magnesium oxide tube

A magnesia, extrusion type technology, applied in the field of metallurgy, can solve the problems of long operation and high production cost of magnesia tube, and achieve the effect of reducing production links, good compactness and simple method.

Inactive Publication Date: 2018-09-11
盐城市华康电热绝缘材料厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the problem of lengthy operation and high production cost for the preparation of magnesium oxide tube by the existing method

Method used

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  • Preparation method of extruded magnesium oxide tube

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preparation example Construction

[0015] The invention provides a method for preparing magnesium oxide tubes by dry pressing, comprising the following steps: a. performing magnetic separation on magnesium oxide powder through an electromagnetic magnetic separator; b. ball milling to a certain fineness after magnetic separation; c. , Stir with high-viscosity cellulose and magnesium oxide powder, and stir it into a dough; d, put the mixed magnesium oxide paste into the barrel, and extrude it through a mold; e, the magnesium oxide after extrusion The tube is calcined at high temperature to become a finished product.

[0016] Wherein, the viscosity of the high-viscosity cellulose in step c is 300,000 viscosity.

[0017] Wherein, the high-viscosity cellulose in step c is methyl cellulose.

[0018] Among them, the airflow granulated magnesium oxide particles are 80-100 mesh.

[0019] In the present invention, in order to reduce the impurity in magnesium oxide, first adopt electromagnetic magnetic separator to carr...

Embodiment 1

[0025] Example 1 Using the method of the present invention to prepare magnesium oxide tubes

[0026] The specific operation steps are as follows:

[0027] a, magnesium oxide powder is carried out magnetic separation through electromagnetic magnetic separator, after magnetic separation, ball milling becomes 350 mesh powder; Magnetic field intensity is 0.5T during described magnetic separation;

[0028] B. Put the mixed paste of methyl cellulose and magnesium oxide powder into an extrusion molding machine, and extrude to obtain a semi-finished product;

[0029] c. Put the semi-finished product obtained in step b into a sintering furnace for sintering, and obtain the magnesium oxide tube 1 after sintering; the sintering temperature is 1200-1300° C., and the sintering time is 40 minutes.

Embodiment 2

[0030] Example 2 Using the method of the present invention to prepare magnesium oxide tubes

[0031] The specific operation steps are as follows:

[0032] a, magnesium oxide powder is carried out magnetic separation through electromagnetic magnetic separator, and after magnetic separation, ball mills into 400 mesh powder; Magnetic field strength is 2T during described magnetic separation;

[0033] B. Put the mixed paste of methyl cellulose and magnesium oxide powder into an extrusion molding machine, and extrude to obtain a semi-finished product;

[0034] c. Put the semi-finished product obtained in step b into a sintering furnace for sintering, and obtain a magnesium oxide tube after sintering; the sintering temperature is 1200-1300° C., and the sintering time is 40 minutes.

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Abstract

The invention belongs to the technical field of metallurgy, in particular to a preparation method of extruded magnesium oxide tube. Aiming at the problems of long operation and high production cost ofthe magnesium oxide pipe prepared by the prior method, the extruded magnesium oxide tube preparation method provides a preparation method of extruded magnesium oxide tube, which is characterized by comprising the following steps of: grinding the magnesium oxide block ball into a certain fineness; the magnesium oxide powder is subjected to magnetic separation by an electromagnetic magnetic separator; stirring magnesium oxide powder with high-viscosity cellulose, and stirring to obtain dough; mixing the mixed magnesium oxide paste into a material cylinder, and extruding and forming through a die; the magnesium oxide pipe after extruding is naturally air-dried or dried, the extruded magnesium oxide pipe is sintered into a finished product through high-temperature heat insulation. The extruded magnesium oxide tube preparation method has the advantages that the semi-finished product with higher density is obtained through extrusion conditions, and the sintering conditions are controlled to prepare the magnesium oxide pipe with high density, large hardness and good compactness.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a preparation method of an extruded magnesium oxide tube. Background technique [0002] The magnesium oxide tube belongs to the cubic crystal system, the melting point is around 2800°C, the Mohs hardness is 5-6, the specific volume resistance value is high at high temperature, and it has good insulation. The high temperature stability and corrosion resistance of magnesia tubes are better than those of alumina ceramics, and can be used in corrosive environments of strong alkali metals. Therefore, magnesium oxide tubes and crucibles can be used to melt various alloy steels and high-temperature alloys without polluting the alloy solution. [0003] At present, most of the magnesium oxide tube products in the domestic market are products with low purity or low density, which are used for refractory materials, ceramic crucibles and thermocouple protection tubes, etc. P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/053C04B35/626C04B35/636C04B35/622B28B21/52B03C1/02
CPCB03C1/02B28B21/52C04B35/053C04B35/622C04B35/62605C04B35/6261C04B35/6365C04B2235/656C04B2235/96
Inventor 王康王益华
Owner 盐城市华康电热绝缘材料厂
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