Preparation method for carbon composite refractory and product prepared by preparation method

A refractory material and carbon composite technology, which is applied in the field of refractory materials, can solve the problems of low slag corrosion resistance and thermal shock resistance, thermal stability and specific surface area inferior to carbon nanotubes, and uneven dispersion of additional carbon nanotubes. Achieve the effects of promoting wettability, excellent slag corrosion resistance and thermal shock resistance

Active Publication Date: 2013-05-01
PUYANG REFRACTORIES GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The above technology has prepared a carbon composite refractory material with in-situ growth of thick carbon nanotubes, which solves the problem of uneven dispersion of additional carbon nanotubes in the carbon composite refractory material; however, the carbon composite refractory material prepared by this technology is coarse The average diameter of carbon nanotubes does not reach the nanometer level, but carbon microtubes. In terms of performance, the strength, thermal stability and specific surface area of ​​carbon nanotubes are not as good as carbon nanotubes, which will lead to the carbon composite refractories prepared The problem of low slag corrosion resistance and thermal shock resistance

Method used

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  • Preparation method for carbon composite refractory and product prepared by preparation method
  • Preparation method for carbon composite refractory and product prepared by preparation method
  • Preparation method for carbon composite refractory and product prepared by preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0040] (1) Add water to 10 mol of iron nitrate and 2 mol of nickel nitrate to prepare a 0.05 mol / L active material precursor solution, add 1000 g of 2 μm corundum powder to 1 L of the above solution and mix, and dry the mixture at 60 °C After 24 hours, use a ball mill to disperse into particles of 2 μm, and roast the above particles at 300°C for 2 hours to obtain the active material-alumina composite material; feed 99.99% argon into the active material-alumina composite material and raise the temperature to 500°C, and then Stop the flow of argon, and at the same time pass 200L / h, 99.99% hydrogen into the active material-alumina composite material for activation for 0.5h;

[0041] (2) Introduce 100L / h of natural gas with a purity of 98v% into the activated active matter-alumina composite material for cracking reaction, the cracking temperature is 900°C, and the cracking time is 1h to obtain alumina with a particle size of 43μm- Carbon nanotube composite material, wherein the di...

Embodiment 2

[0046] (1) Add water to 1 mol of iron nitrate and 5 mol of nickel nitrate to prepare a 0.5 mol / L active material precursor solution, add 10 kg, 500 μm magnesia to 1 L of the above solution and mix, and dry the mixture at 80 °C After 36 hours, use a ball mill to disperse the particles into 500 μm particles, and roast the above particles at 600°C for 30 minutes to obtain the active material-magnesia composite material; feed 99.99% argon gas into the active material-magnesia composite material and raise the temperature to 600°C, and then Stop the flow of argon, and at the same time pass 300L / h, 99.99% hydrogen into the active material-magnesia composite material for activation for 1h;

[0047] (2) Introduce 500L / h of natural gas with a purity of 95v% into the activated active material-magnesia composite material for cracking reaction. The cracking temperature is 600°C and the cracking time is 4h to obtain magnesium oxide- Carbon nanotube composite material, wherein the diameter o...

Embodiment 3

[0052] (1) Add water to 1 mol of iron nitrate and 3 mol of nickel nitrate to form a 0.3 mol / L active substance precursor solution, add 1500 g of 5 μm zirconia and 1500 g of 5 μm corundum powder to 1 L of the above solution and mix them. After the mixture was dried at 100°C for 12 hours, it was dispersed into 5 μm particles with a ball mill, and the above particles were fired at 400°C for 60 minutes to obtain the active material-zirconia-alumina composite; 99.99% argon and heat up to 400°C, then stop argon, and at the same time pass 400L / h 99.99% hydrogen into the active material-zirconia-alumina composite material for activation for 2h;

[0053] (2) Introduce 300L / h of ethane with a purity of 95v% and 1200L / h of high-purity hydrogen into the activated active material-zirconia-alumina composite material for cracking reaction. The cracking temperature is 800°C and the cracking time is For 2h, the zirconia-alumina-carbon nanotube composite material with a particle size of 43 μm w...

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Abstract

The invention discloses a preparation method for carbon composite refractory. The preparation method comprises the following steps of: firstly, preparing an active matter precursor into solution, adding oxide in the solution and mixing, and drying, dispersing and roasting the mixture to obtain an active matter-oxide composite material; secondly, catalyzing carbon source gas or mixed gas of the carbon source gas and hydrogen gas by using the activated active matter-oxide composite material, and performing cracking reaction to obtain an oxide-carbon nanotube composite material; thirdly, impregnating the oxide-carbon nanotube composite material in ethanol solution to form a preimpregnation body; fourthly, mixing at least one of oxide micro powder, carbon black and graphite with an antioxidant to form a premixing body; and fifthly, sequentially adding a binding agent, the preimpregnation body and the premixing body in base stock and aging, forming and drying to obtain the carbon composite refractory. Carbon nanotubes in the prepared refractory are uniform in distribution and are strongly combined with a refractory raw material; and the prepared refractory is suitable for high-temperature environment in the metallurgical steelmaking industry.

Description

technical field [0001] The invention relates to a method for preparing a carbon composite refractory material and a refractory material product obtained by the method, belonging to the technical field of refractory materials. Background technique [0002] Carbon composite refractory materials refer to materials made of oxide base material and carbon as the main raw materials, and add appropriate amount of binder and other additives. Common carbon composite refractory materials include magnesium carbon, aluminum carbon and zirconium carbon. refractory material. Carbon composite refractories not only have high refractoriness and high temperature strength, but also have good performance in slag corrosion resistance and thermal shock resistance, and are widely used in iron and steel metallurgy fields such as blast furnaces, converters, electric furnaces and continuous casting systems. When carbon composite refractories are used in the field of steelmaking, when high-temperature...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/622
Inventor 李楠梁峰刘百宽贺中央孙荣海闫光辉刘国威张厚兴
Owner PUYANG REFRACTORIES GRP CO LTD
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