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Periclase-silicon oxynitride composite refractory for microwave metallurgy kiln car

A technology of microwave metallurgy and silicon oxynitride, applied in the field of refractory materials for microwave metallurgical kiln cars, achieving the effects of low production cost, excellent wave transparency, and improved thermal shock stability

Active Publication Date: 2017-12-12
REFRACTORY MATERIAL OF SINOSTEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is no research on the refractory system for microwave metallurgy. If refractory materials suitable for microwave metallurgy can be developed and prepared, it will promote the progress of new metallurgical technologies.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]Step 1, 15 parts of magnesia fine powder, SiO 2 Micropowder 6 parts, SiO 2 The particle size of the powder is 1-5 μm, 10 parts of Si powder are put into a ball mill according to the ratio of corundum balls and materials to 1:1, and the speed is 1000~1200rpm, and the grinding is carried out for 120-180 minutes to obtain the premixed fine powder;

[0037] Step 2. Pour 69 parts of magnesia aggregate into the mixer, and then add 6 wt % binder, turn on the mixer and stir for 5-10 minutes, so that the binder evenly adheres to the surface of the magnesia particles and wet it, then add the pre-mixed fine powder obtained in step 1, and stir for 10-20 minutes to fully mix the materials evenly;

[0038] Step 3, put the mixed material into a sealed bag and place it in an air atmosphere with an air humidity of 50-60% at room temperature for 12-24 hours;

[0039] Step 4. After the material is trapped, use a hydraulic press to make adobe from the uniformly mixed material under a pres...

Embodiment 2

[0043] Step 1, first mix 20 parts of magnesia fine powder, SiO 2 Micropowder 4 parts, SiO 2 The particle size of the powder is 5-8 μm, 11 parts of Si powder are put into a ball mill according to the ratio of corundum balls and materials to 1:1, and the grinding speed is 1000-1200 rpm for 120-180 minutes to obtain pre-mixed fine powder;

[0044] Step 2: Pour 65 parts of magnesia aggregate into the mixer, then add 3 wt % binder, turn on the mixer and stir for 5-10 minutes, so that the binder evenly adheres to the surface of the magnesia particles and wet it, then add the pre-mixed fine powder obtained in step 1, and stir for 10-20 minutes to fully mix the materials evenly;

[0045] Step 3, put the mixed material into a sealed bag and place it in an air atmosphere with an air humidity of 50-60% at room temperature for 12-24 hours;

[0046] Step 4. After the material is trapped, use a hydraulic press to make adobe from the uniformly mixed material under a pressure of 120MPa, and...

Embodiment 3

[0050] Step 1, 15 parts of magnesia fine powder, SiO 2 Micropowder 3 parts, SiO 2 The particle size of the powder is 1-10 μm, 12 parts of Si powder are put into a ball mill according to the ratio of corundum balls to the material of 1:1, and the rotation speed is 1000-1200 rpm, and the grinding is carried out for 120-180 minutes to obtain the pre-mixed fine powder;

[0051] Step 2. Pour 70 parts of magnesia aggregate into the mixer, and then add 3-6 wt % binder, turn on the mixer and stir for 5-10 minutes, so that the binder evenly adheres to the surface of the magnesia particles and wet it, then add the pre-mixed fine powder obtained in step 1, and stir for 10-20 minutes to fully mix the materials evenly;

[0052] Step 3, put the mixed material into a sealed bag and place it in an air atmosphere with an air humidity of 50-60% at room temperature for 12-24 hours;

[0053] Step 4. After the material is trapped, use a hydraulic press to make adobe from the uniformly mixed mate...

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PUM

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Abstract

The invention discloses a periclase-silicon oxynitride composite refractory with the characteristics of low electromagnetic absorption rate, excellent wave permeability, high-temperature volume stability, good thermal shock resistance and excellent corrosion resistance for a microwave metallurgy kiln car, and a preparation method of the periclase-silicon oxynitride composite refractory. The adding amount of starting materials in parts by weight are as follows: 65 to 70 parts of magnesia aggregate, 15 to 23 parts of magnesia fine powder, 2 to 6 parts of SiO2 micro powder and 10 to 15 parts of Si powder; the adding amount of a binding agent is 3 to 6 percent of the total weight of the starting materials. The periclase-silicon oxynitride composite refractory disclosed by the invention has the following properties that the volume density is 2.8 to 2.95g / cm<3>, the cold compressive strength is 80 to 120MPa, the cold bending strength is 15 to 25MPa, and hot modulus of rupture is about 5 to 10MPa at the temperature of 1400 DEG C; according to the YB / T 376.1-1995 standard, water-cooling times is 10 to 20 at the temperature of 1100 DEG C, and dielectric constant at normal temperature is 8 to 11; the periclase-silicon oxynitride composite refractory has good corrosion resistance.

Description

technical field [0001] The invention relates to a refractory material for a microwave metallurgical kiln car, in particular to a refractory material by adding Si powder and Si0 2 Preparation of periclase-silicon oxynitride composite refractory by powder in-situ reaction and its preparation method. Background technique [0002] With the continuous development of science and technology, environmental protection has been paid more and more attention in life and production. Traditional heavy industries, especially high-temperature industries such as metal smelting, urgently need to change their production methods to meet the requirements of national development. The emergence of microwave heating technology has made high-temperature heating a more energy-saving and environmentally friendly heating method. Among them, the use of microwave heating to smelt metals is called green metallurgy, which is a new technology that has emerged in recent years. [0003] Due to the emergence...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/043C04B35/622C04B35/65
CPCC04B35/043C04B35/622C04B35/65C04B2235/3418C04B2235/428C04B2235/46C04B2235/602C04B2235/606C04B2235/656C04B2235/6562C04B2235/6567C04B2235/658C04B2235/66C04B2235/77C04B2235/96
Inventor 王玉霞徐恩霞董萌蕾刘萍李素萍邓俊杰李愿
Owner REFRACTORY MATERIAL OF SINOSTEEL CORP
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