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A kind of forsterite refractory material for high temperature kiln and its preparation method

A forsterite and refractory technology, applied in the field of forsterite refractories, can solve the problems of restricting the application of refractory products, unstable high temperature properties of forsterite, affecting the high temperature performance of products, etc., and achieves excellent thermal shock stability, The effect of high softening temperature under load and low production cost

Inactive Publication Date: 2018-10-26
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main performance is that the impurity content in the raw material is high, and due to the limitation of the preparation method, the high-temperature properties of the prepared forsterite are unstable, which significantly affects the high-temperature performance of the product, and thus cannot be compatible with erosive media, reducing atmosphere, alkaline dust, etc. Long-term use in high-temperature environment, which limits its application in refractory products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A forsterite refractory material for a high-temperature kiln and a preparation method thereof. The concrete steps of this embodiment are:

[0035] The first step is to mix 30~50wt% of silicon-containing raw materials, 20~30wt% of magnesium salt, 20~30wt% of zinc-containing raw materials and 5~15wt% of iron powder, and press them under the condition of 50~100MPa. Heat treatment in a reducing atmosphere at 800-1100°C for 3-6 hours, crush, grind, and sieve to obtain material A with a particle size of less than 0.045mm.

[0036] Second step, the described A material of 50~60wt%, the boric acid of 5~10wt%, the tensio-active agent of 10~15wt%, the thickener of 5~10wt% and the additive of 5~15wt% are mixed uniformly, namely Obtain a mixture; add 30 to 50 wt% of water to the mixture, and ball mill to obtain a mixture slurry.

[0037] The 3rd step, the magnesia fine powder of 40~50wt%, the described silicon-containing raw material of 40~50wt%, the described magnesium salt of 5...

Embodiment 2

[0049] A forsterite refractory material for a high-temperature kiln and a preparation method thereof. Except following material, all the other are with embodiment 1:

[0050] The silicon-containing raw material is fused silica;

[0051] The magnesium salt is magnesium sulfate;

[0052] The zinc-containing raw material is zinc phosphate;

[0053] The reducing atmosphere is a carbon monoxide atmosphere;

[0054] The surfactant is an alkyl glycoside;

[0055] The thickener is modified starch;

[0056] Described additive is white carbon black;

[0057] The magnesia is fused magnesia.

Embodiment 3

[0059] A forsterite refractory material for a high-temperature kiln and a preparation method thereof. The concrete steps of this embodiment are:

[0060] The first step is to mix 20~40wt% of silicon-containing raw materials, 30~40wt% of magnesium salt, 10~20wt% of zinc-containing raw materials and 10~20wt% of iron powder, and press them under the condition of 50~100MPa. Heat treatment in a reducing atmosphere at 900-1200°C for 3-6 hours, crush, grind, and sieve to obtain material A with a particle size of less than 0.045mm.

[0061] In the second step, the A material of 60~70wt%, the boric acid of 1~6wt%, the surfactant of 5~10wt%, the thickener of 10~15wt% and the additive of 3~10wt% are mixed evenly, namely Obtain a mixture; add 40 to 60 wt% of water to the mixture, and ball mill to obtain a mixture slurry.

[0062] The 3rd step, the magnesia fine powder of 50~60wt%, the described silicon-containing raw material of 30~40wt%, the described magnesium salt of 10~15wt% and the...

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Abstract

The invention provides a forsterite refractory material for a high-temperature kiln and a preparation method of the material. According to the technical scheme, silicon-containing raw materials, magnesium salt, zinc-containing raw materials and iron powder are mixed, pressed and formed, subjected to heat treatment under the reduction atmosphere, ground and screened to obtain a material A; the material A, boronic acid, surfactant, thickener and additive are mixed, water is added, ball milling is conducted, and mixed slurry is obtained; magnesite fine powder, the silicon-containing raw materials, magnesium salt and the material A are mixed, pressed and formed, subjected to heat treatment and vacuum impregnation, subjected to heat treatment again, ground and screened, and a material B and a material C are obtained; magnesite particles, magnesite fine powder, the silicon-containing raw materials, the material B, the material C and the material A are mixed, pressed and formed and subjected to heat treatment, and the forsterite refractory material for the high-temperature kiln is obtained. Raw materials are wide in source, production cost is low, and the prepared forsterite refractory material for the high-temperature kiln is larger in normal-temperature compressive strength, good in thermal shock stability, high in refractoriness under load and excellent in erosion resistance.

Description

technical field [0001] The invention belongs to the technical field of forsterite refractory materials. In particular, it relates to a forsterite refractory material for a high-temperature kiln and a preparation method thereof. Background technique [0002] Forsterite crystals have excellent characteristics such as high melting point, low thermal conductivity, stable chemical properties, and high corrosion resistance to metal melts and slag. However, natural forsterite not only has high impurity content and large loss on ignition, but even after high-temperature calcination, it still cannot meet the requirements of high-grade refractory products, which seriously affects the production of refractory materials and the promotion of refractory products. [0003] The methods for preparing forsterite in the prior art all have certain deficiencies. The main performance is that the impurity content in the raw material is high, and due to the limitation of the preparation method, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/16C04B35/622
CPCC04B35/16C04B35/622C04B35/66C04B2235/3206C04B2235/3284C04B2235/3418C04B2235/658C04B2235/6582
Inventor 陈少一刘浩王周福王玺堂马妍
Owner WUHAN UNIV OF SCI & TECH
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