Forsterite-C-contained MgO-SiC-C fire-resistant material and preparation thereof

A technology of forsterite and refractory materials, which is applied in the field of composite refractory materials, can solve the problems affecting the high temperature strength and erosion resistance of materials, the high price of industrial SiC, and the increasing shortage of magnesia resources, so as to solve the shortage of magnesia resources, Solve the effect of resource shortage and low production cost

Inactive Publication Date: 2008-12-24
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing production and preparation method of MgO-SiC-C refractories is to use magnesia and industrial SiC as the main raw materials, use phenolic resin as the binder, adopt mechanical mixing and then press and press to form the production (such as ZL200610019553.7 ), the advantage of this method is to replace graphite (C) with industrial SiC to ensure the corrosion resistance and thermal shock resistance of the material. The problem is that this method requ

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A MgO-SiC-C refractory material containing forsterite-C and a preparation method thereof. First mix 30-40wt% of 3-1mm magnesia particles, 20-30wt% of 1-0mm magnesia particles, 15-25wt% of forsterite-C mixed fine powder and 15-25wt% of magnesia fine powder , plus 5-7% sodium lignosulfonate and calcium lignosulfonate as a binder, prepared into an aqueous solution and stirred for 10-30 minutes, shaped by a brick press, dried at 60-110°C for 24 hours and then placed in a reducing atmosphere After firing at 1450~1600℃ for 6~8 hours, the MgO-SiC-C composite refractory material is obtained. in:

[0018] The MgO content of the magnesia particles is more than or equal to 80%, and the particle size is 3-1mm and 1-0mm;

[0019] The MgO content of the magnesia fine powder is more than or equal to 80%, and the particle size is 0.1-0 mm;

[0020] The forsterite-C mixed fine powder is mixed with forsterite ore powder and C powder in a molar ratio of 1-2.5:3-3.5, and the particle si...

Embodiment 2

[0024] A MgO-SiC-C refractory material containing forsterite-C and a preparation method thereof. First mix 25-35wt% of 3-1mm magnesia particles, 25-35wt% of 1-0mm magnesia particles, 20-30wt% of forsterite-C mixed fine powder and 20-30wt% of magnesia fine powder , plus 5-6% calcium lignosulfonate as a binder, prepared into an aqueous solution and stirred for 10-30 minutes, shaped by a brick press, dried at 60-110°C for 24 hours and then heated at 1600-1700°C in a reducing atmosphere. ×Firing for 4 to 6 hours to make MgO-SiC-C composite refractories.

[0025] The forsterite-C mixed fine powder is mixed with forsterite ore powder and C powder in a molar ratio of 2.5-4:3-3.5, and the particle size is 0.1-0mm. All the other are with embodiment 1.

Embodiment 3

[0027] A MgO-SiC-C refractory material containing forsterite-C and a preparation method thereof. First mix 30-40wt% of 3-1mm magnesia particles, 20-30wt% of 1-0mm magnesia particles, 25-35wt% of forsterite-C mixed fine powder and 10-20wt% of magnesia fine powder , plus 7-10% of sulfurous acid pulp waste liquid as a binder, stirred for 10-30 minutes, and then shaped into a brick press; after drying at 60-110°C for 24 hours, it was dried at 1450-1600°C for 4-6 hours in a reducing atmosphere. Hours of firing, made of MgO-SiC-C composite refractories.

[0028] The forsterite-C mixed fine powder is mixed with forsterite ore powder and C powder in a molar ratio of 1-2.5:4.5-6, and the particle size is 0.1-0mm. All the other are with embodiment 1.

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Abstract

The invention relates to a forsterite-C-containing MgO-SiC-C material refractory and a method for preparing the same. The technical scheme comprises firstly mixing the 25-40wt% of magnesia particles with a grain size of 3-1mm, 20-35wt% of magnesia particles with a grain size of 1-0mm, 5-40wt% of forsterite-C mixed fine powders and 0-35wt% of magnesia fine powders, adding a 4-10wt% of bonding agent accounting for the weight of the mixed material, stirring or mulling for 10-30 minutes, drying after pressing formation, sintering at a reductive atmosphere with a sintering temperature of 1450-1700 DEG C and a heat preservation time of 4-8 hours, getting the MgO-SiC-C material composite refractory. The MgO-SiC-C material refractory prepared by adding the forsterite and carbon not only can solve the problem of magnesia resource shortage, reduces the production cost, but also the SiC prepared by the reaction of magnesia and carbon at a high temperature can reinforce the conjugation inside the material, and be useful for improving the refractory performance. The invention can also adopt low grade magnesia.

Description

technical field [0001] The invention belongs to the use of magnesia, forsterite (2MgO·SiO 2 ), industrial carbon powder (C) as the base material in the field of composite refractories. In particular, it relates to a MgO-SiC-C refractory material containing forsterite-C and a preparation method thereof. Background technique [0002] MgO-SiC-C composite materials have excellent high temperature resistance and thermal stability, can be used in non-ferrous metals and iron and steel smelting equipment, and can also be prepared into high-quality high temperature resistant heat insulation materials and wall materials for high temperature kilns, especially It is suitable for the ladle lining and refining furnace lining of clean steel such as low carbon steel and ultra-low carbon steel, replacing MgO-C material, which is beneficial to the quality of steel and has a good use effect. [0003] The existing production and preparation method of MgO-SiC-C refractories is to use magnesia ...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 祝洪喜邓承继白晨
Owner WUHAN UNIV OF SCI & TECH
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