Unlock instant, AI-driven research and patent intelligence for your innovation.

Magnesium-calcium-based fireproof material based on microwave sintering, and preparation method thereof

A microwave sintering and refractory technology, applied in the field of refractory materials, can solve the problems of low density of magnesia-calcium refractories, limited application of magnesia-calcium refractories, long sintering time, etc., and achieves good hydration resistance, resistance to The effect of excellent hydration performance and short sintering time

Inactive Publication Date: 2017-12-22
WUHAN UNIV OF SCI & TECH
View PDF7 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, although the existing methods for preparing magnesia-calcium refractories have their advantages, there are still technical defects such as slow heating rate, long sintering time and high sintering temperature, and the prepared magnesia-calcium refractories are not dense enough. High, which limits the application of magnesium-calcium refractories in a wider range of fields

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Magnesium-calcium-based fireproof material based on microwave sintering, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A magnesium-calcium refractory material based on microwave sintering and a preparation method thereof. The specific steps of the preparation method described in this embodiment are:

[0026] The first step is to crush the natural dolomite to a particle size of <10mm, lightly burn it at 800-950°C for 2-3.5 hours, and cool it to obtain the light-burned dolomite; the mass ratio of distilled water: the light-burned dolomite is 0.50~1.5:1, add distilled water to the lightly burned dolomite, digest for 12~24 hours, and obtain digested powder.

[0027] In the second step, the digested powder is put into a ball milling jar, the rotating speed of the ball milling jar is 100~250r / min, and the ball milling time is 5~6h; then the powder after ball milling is dried at 50 It is made into a compact under the condition of ~200MPa.

[0028] In the third step, green SiC powder is spread on the bottom of the polycrystalline mullite fiber insulation bucket, and then the compact is placed...

Embodiment 2

[0032] A magnesium-calcium refractory material based on microwave sintering and a preparation method thereof. The specific steps of the preparation method described in this embodiment are:

[0033] Lightly burnt at 850~1000°C for 2.5~4h, cooled to obtain lightly burned dolomite; according to distilled water: the mass ratio of lightly burned dolomite is 1.0~2.0:1, add to the lightly burned dolomite Distilled water, digested for 12-24 hours to obtain digested powder.

[0034] In the second step, the digested powder is put into a ball milling tank, the rotating speed of the ball milling tank is 150 ~ 300r / min, and the ball milling time is 4 ~ 5h; then the powder after ball milling is dried at 50 It is made into a compact under the condition of ~200MPa.

[0035] In the third step, green SiC powder is spread on the bottom of the polycrystalline mullite fiber insulation bucket, and then the compact is placed in the equivalent position in the polycrystalline mullite fiber insulatio...

Embodiment 3

[0039] A magnesium-calcium refractory material based on microwave sintering and a preparation method thereof. The specific steps of the preparation method described in this embodiment are:

[0040] Lightly burnt at 900~1050°C for 3~4.5 hours, cooled to obtain lightly burned dolomite; according to distilled water: the mass ratio of the lightly burned dolomite is 1.5~2.5:1, add the lightly burned dolomite to the lightly burned dolomite Add distilled water and digest for 12-24 hours to obtain digested powder.

[0041] In the second step, the digested powder is put into a ball milling jar, the rotating speed of the ball milling jar is 200~350r / min, and the ball milling time is 3~4h; then the powder after ball milling is dried at 50 It is made into a compact under the condition of ~200MPa.

[0042] In the third step, green SiC powder is spread on the bottom of the polycrystalline mullite fiber insulation bucket, and then the compact is placed in the equivalent position in the polyc...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
densityaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

The present invention relates to a magnesium-calcium-based fireproof material based on microwave sintering, and a preparation method thereof. The technical scheme comprises: breaking natural dolomite, and carrying out light burning to obtain light burning dolomite; adding distilled water to the light burning dolomite, and digesting to obtain digested powder; carrying out ball milling on the digested powder, drying, and pressing to obtain a pressed billet; spreading green SiC powder at the bottom portion of a polycrystalline mullite fiber thermal insulation barrel, placing the pressed billet at the equivalent position of the polycrystalline mullite fiber thermal insulation barrel, and adding the green SiC powder until the pressed billet is completely covered; and placing the polycrystalline mullite fiber thermal insulation barrel into a microwave sintering furnace, vacuumizing the microwave sintering furnace until the vacuum degree is less than 0.5 Pa, heating to a temperature of 1200-1500 DEG C under high-purity argon at a rate of 10-60 DEG C / min, carrying out thermal insulation, and cooling along with the furnace to prepare the magnesium-calcium-based fireproof material based on microwave sintering. According to the present invention, the preparation method has advantages of rapid heating, short sintering time and low sintering temperature, and the prepared product has advantages of compact microstructure, good hydration resistance and good corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of refractory materials. In particular, it relates to a microwave-sintered magnesia-calcium refractory material and a preparation method thereof. Background technique [0002] Magnesia-calcium refractories have a series of advantages such as high melting point, good slag resistance, easy hanging of kiln skin, purification of molten steel, and abundant resources. They are known as "one of the four major development directions of refractory materials in the 21st century". However, MgO-CaO refractories also have disadvantages such as difficult sintering and easy hydration of CaO, which limit their application. [0003] Magnesia-calcium refractories are difficult to sinter, so the degree of density is not high, resulting in easy hydration of CaO grains, which reduces the performance and service life of the product. Introducing additives into magnesia-calcium refractories to promote sintering or optimize the pr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/06C04B35/64
CPCC04B35/66C04B35/06C04B35/64C04B2235/3826C04B2235/6562C04B2235/667C04B2235/77
Inventor 马妍邹千王玺堂王周福刘浩许欢
Owner WUHAN UNIV OF SCI & TECH