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Sialon bonded andalusite/sillimanite/SiC refractory material and preparation method

A technology of refractory materials and sillimanite, which is applied in the field of refractory materials for the middle and upper part of the blast furnace shaft, can solve the problems of small differences in physical and chemical properties between silicon and silicon carbide, reduced cutting efficiency, environmental pollution, etc., and achieve superior heat resistance Shock resistance, reduced preparation cost, and simple production process

Inactive Publication Date: 2014-08-13
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the cutting process, 50%-52% of the crystalline silicon will turn into silicon micropowder and enter the cutting slurry due to knife damage, resulting in a reduction in cutting efficiency, and eventually the cutting slurry will fail and become waste slurry, causing waste of resources and environmental pollution, and bringing great harm to the enterprise. great pressure
At present, silicon carbide is widely used as cutting abrasive, so the cutting waste slurry mainly contains high-purity silicon, polyethylene glycol (dispersant), silicon carbide and a small amount of metal, but silicon and silicon carbide have little difference in physical and chemical properties. , Difficult to separate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: A sialon-bonded andalusite / sillimanite / SiC composite refractory material used in the upper part of a blast furnace and its preparation method. In terms of weight percentage, the raw material composition is: 8% andalusite with a particle size of 5-3mm, 37 % sillimanite with particle size 3-1mm, 25% sillimanite with particle size 1-0mm, 9% α-Al 2 o 3 Powder, 16% polysilicon waste, 2.4% aluminum powder, plus 2.5% dextrin and 1.2% phenolic resin as the binder.

[0024] Described preparation method comprises the following steps:

[0025] a. Weigh various raw materials according to the stated ratio, and premix the powder part for 30-60 minutes. The powder part includes sillimanite with a particle size of 1-0 mm, α-Al 2 o 3 powder, polysilicon waste, aluminum powder.

[0026] b. First add andalusite with a particle size of 5-3mm and sillimanite with a particle size of 3-1mm, then add 2 / 3 of the total amount of the binder formed by dextrin and phenolic resin prep...

Embodiment 2

[0031] Embodiment 2: production technology is identical with embodiment 1, and difference is:

[0032] In terms of weight percentage, the raw material composition is: 8% andalusite with a particle size of 5-3mm, 37% sillimanite with a particle size of 3-1mm, 25% sillimanite with a particle size of 1-0mm, 7.5% α-Al 2 o 3 Powder, 18% polysilicon waste, 2.4% aluminum powder, plus 2.5% dextrin and 1.2% phenolic resin as a binder.

[0033] The performance indicators of the obtained product are: apparent porosity 12%, bulk density 2.78g / cm 3 , Normal temperature compressive strength 182MPa, high temperature flexural strength 40MPa, load softening temperature ≥ 1700°C, good thermal shock resistance, creep resistance and strong resistance to CO and alkali steam erosion.

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Abstract

The invention discloses a sialon bonded andalusite / sillimanite / SiC refractory material and a preparation method, and belongs to the field of a refractory material. The refractory material comprises the following raw materials: andalusite, sillimanite, alpha-Al2O3 powder, polycrystalline silicon waste and aluminum powder, and dextrin and phenolic resin are taken as binding agents. The refractory material is produced by the following steps: weighing raw materials and mixing to obtain mud, compressing and moulding, and sintering in a nitrogen atmosphere at 1200-1600 DEG C. According to the product disclosed by the invention, characteristics of andalusite and sillimanite are developed and a sialon bonded phase is generated through the polycrystalline silicon waste; the refractory material has the following excellent physical performance indexes: apparent porosity is 9-18%, volume density is 2.5-3.0g / cm<3>, cold crushing strength is 100-300MPa and high temperature bending strength is 20-70MPa, thermal shock resistance, creep resistance, CO resistance and alkaline steam erosion resistance are excellent. The product disclosed by the invention is high in cost performance, and is applicable to the middle upper part of furnace body of a blast furnace. The refractory material is not only favorable for prolonging service life of the blast furnace but also realizes recycling of the polycrystalline silicon waste.

Description

technical field [0001] The invention relates to a refractory material for the middle and upper part of a blast furnace shaft, in particular to a sialon-bonded andalusite / sillimanite / SiC composite refractory material and a preparation method for the middle and upper part of a large blast furnace shaft. Background technique [0002] Realizing the longevity and large-scale of blast furnace is an important goal of ironmaking industry. With the continuous deepening and strong promotion of energy saving and consumption reduction and energy saving and emission reduction in my country's iron and steel metallurgical industry, the development of refractory materials suitable for blast furnace longevity is an urgent problem to be solved. From top to bottom, the blast furnace body is divided into five parts: the furnace throat, the furnace body, the furnace waist, the furnace bosh, and the hearth. Due to the different working conditions of each part, the reasons for the erosion of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/622
Inventor 李勇王婷李平李燕京孙加林高长贺张积礼
Owner UNIV OF SCI & TECH BEIJING
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