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Chromium corundum material and production method thereof

A technology of chromium corundum material and production method, applied in the field of refractory materials, can solve the problems of high temperature resistance, slag resistance and corrosion resistance limitations, high production cost, and achieve excellent corrosion resistance, good crystal development, and reduced emissions. Effect

Active Publication Date: 2014-07-02
锦州集信高温材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main production method of chrome corundum is to produce industrial aluminum oxide and chromium oxide green through electric melting. Due to the high price of chrome oxide green, the Cr in the produced chrome corundum 2 o 3 The content is generally low, generally only 1% to 2%, the high temperature resistance, slag resistance and corrosion resistance of the product are all limited, and there is a problem of high production cost with industrial alumina and chromium oxide green as raw materials

Method used

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  • Chromium corundum material and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] a. Raw materials and processing

[0029] Will Al 2 o 3 Content is 78wt%, Cr 2 o 3 The aluminum-chromium slag block material with a content of 13 wt % was crushed to a particle size of ≤20mm, and the content of CaO in the aluminum-chromium slag was detected to be 3wt% and Na 2 The content of O is 2wt%; the reducing agent petroleum coke is taken and crushed to a particle size of ≤20mm;

[0030] b . Mixed pressure ball

[0031] Take 3000kg of crushed aluminum chromium slag in step a, 1000kg of alumina with a particle size ≤ 1mm and a content of 98.6wt%, 300kg of crushed petroleum coke in step a and 160kg of aluminum fluoride and mix evenly to obtain a mixture, and heat the binder pitch Spray into the mixture at 80°C, the added amount of the asphalt accounts for 45kg of the total mass of the mixture, send it to the briquetting machine to be pressed into Φ50mm balls, and dry into dry balls with a moisture content of ≤0.5%;

[0032] c. high temperature melting

[...

Embodiment 2

[0039] a. Raw materials and processing

[0040] Will Al 2 o 3 The content is 84wt%, Cr 2 o 3 Content is 10wt% aluminum chromium slag block material is pulverized to particle size ≤ 20mm, and the content of CaO in the aluminum chromium slag after testing is 3wt% and Na 2 The content of O is 2wt%; the reducing agent petroleum coke is taken and crushed to a particle size of ≤20mm;

[0041] b . Mixed pressure ball

[0042] Take 2000kg of crushed aluminum chrome slag in step a, 1000kg of alumina with a particle size ≤ 1mm and a content of 98.6wt%, 240kg of crushed petroleum coke in step a, and 110kg of aluminum fluoride, and mix evenly to obtain a mixture, and heat the binder pitch Spray it into the mixture at 60°C, the amount of asphalt added accounts for 67kg of the total mass of the mixture, send it to a briquette machine to press into Φ30mm pellets, and dry them into dry pellets with a moisture content of ≤0.5%;

[0043] c. high temperature melting

[0044] Put the ...

Embodiment 3

[0050] a. Raw materials and processing

[0051] Will Al 2 o 3 The content is 80wt%, Cr 2 o 3 Content is 11wt% aluminum chromium slag block material is pulverized to particle size ≤ 20mm, the content of CaO in the aluminum chromium slag after testing is 3wt% and Na 2 The content of O is 2wt%; the reducing agent petroleum coke is taken and crushed to a particle size of ≤20mm;

[0052] b . Mixed pressure ball

[0053] Take 2000kg of crushed aluminum chromium slag in step a, 2000kg of alumina with a particle size ≤ 1mm and a content of 98.6wt%, 200kg of crushed petroleum coke in step a and 130kg of aluminum fluoride and mix evenly to obtain a mixture, and heat the binder pitch Spray it into the mixture at 70°C, the amount of asphalt added accounts for 213kg of the total mass of the mixture, send it to a briquette machine to press into Φ40mm pellets, and dry them into dry pellets with a moisture content of ≤0.5%;

[0054] c. high temperature melting

[0055] Add the dry...

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Abstract

The invention relates to a chromium corundum material and a production method thereof. The chromium corundum material consists of 90wt%-94.5wt% of aluminum oxide, 3wt%-8wt% of chromic oxide and less than and equal to 2.5wt% of total impurities. The production method comprises the steps of uniformly mixing aluminum-chromium slag having a particle size less than and equal to 20mm, aluminum oxide having a particle size less than and equal to 1mm, petroleum coke having a particle size less than and equal to 20mm and aluminum fluoride, heating bitumen and spraying to the mixture, pressing into ball materials, drying, and adding the dried ball materials to an electric-arc furnace; smelting, pouring smelted liquid in a slag pot, removing the calcium fluoride floating on the upper part of the liquid material and standing; and separating from the slag pot, crushing, selecting chromium metal reduced by carbon and finishing to obtain the chromium corundum material. The chromium corundum material has the advantages that the problem of aluminum chromium slag solid waste is solved by taking aluminum chromium slag as raw materials, environmental friendliness is achieved, the raw material cost is lowered, the contents of Al2O3 and Cr2O3 are improved and the high-temperature performance, slag resistance and corrosion resistance of the chromium corundum material are ensured.

Description

technical field [0001] The invention belongs to the field of refractory materials, in particular to a chrome corundum material and a production method thereof. Background technique [0002] The main composition of chrome corundum is α-Al 2 o 3 and Cr 2 o 3 solid solution of Al 2 o 3 and Cr 2 o 3 The mass percentage of the total amount is ≥96%, which is a refractory material with excellent corrosion resistance. At present, the main production method of chrome corundum is to produce industrial aluminum oxide and chromium oxide green through electric melting. Due to the high price of chrome oxide green, the Cr in the produced chrome corundum 2 o 3 The content is generally low, generally only 1% to 2%. The high temperature resistance, slag resistance and corrosion resistance of the product are all limited, and there is a problem of high production cost with industrial alumina and chromium oxide green as raw materials. [0003] Aluminum chromium slag is the solid waste ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 寇志远高红军赵丽田刚
Owner 锦州集信高温材料有限公司
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