Method for preparing brown corundum by using powdery bauxite and ash residues

A technology of bauxite and brown corundum, which is applied in the field of preparing brown corundum by using powdery bauxite and ash slag, which can solve the problems of waste of resources and achieve the effects of increasing air permeability, shortening smelting time, and lowering smelting temperature

Pending Publication Date: 2019-10-25
GUIZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the ash contains a large amount of Al elements, it causes a waste of resources when it is treated as a waste. Therefore, people are currently thinking about how to reuse the ash on a large scale.
[0005] At present, there is no report on using ash slag and bauxite as raw materials for brown corundum to prepare brown corundum.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: a kind of method utilizing powdery bauxite and ash to prepare brown corundum, is characterized in that, comprises the steps:

[0025] 1) Alkali leaching of ash residue at 90°C for 15 minutes (caustic alkali concentration is 80g / L, liquid-solid ratio is 3:1), and the alkali solution is filtered to obtain product A;

[0026] 2) Mix the powdered bauxite and product A according to the mass ratio of 5:1, and make agglomerates (groups) to obtain product B;

[0027] 3) Preheat product B at 50°C, and then heat it up to 900°C for 1.0 h of dehydration to obtain product C;

[0028] 4) Mix product C with coke and iron filings at a mass ratio of 300:3:5, then send it to an electric arc smelting furnace for conventional smelting, and finally produce brown corundum finished products after cooling, grading, crushing and screening.

Embodiment 2

[0029] Embodiment 2: a kind of method utilizing powdery bauxite and ash to prepare brown corundum, is characterized in that, comprises the steps:

[0030] 1) Alkali leaching the ash residue at 95°C for 10 minutes (caustic alkali concentration is 90g / L, liquid-solid ratio is 5:1), and the lye is filtered to obtain product A;

[0031] 2) Mix the powdered bauxite and product A according to the mass ratio of 3:1, and make agglomerates (groups) to obtain product B;

[0032] 3) Preheat product B at 300°C, then heat up to 1100°C for 0.5h to dehydrate to obtain product C;

[0033] 4) Mix product C with coke and iron filings at a mass ratio of 300:1:2, then send it to an electric arc smelting furnace for conventional smelting, and finally produce brown corundum finished products after cooling, grading, crushing and screening.

Embodiment 3

[0034] Embodiment 3: a kind of method utilizing powdery bauxite and ash to prepare brown corundum, is characterized in that, comprises the following steps:

[0035] 1) Alkali leaching the ash residue at 85°C for 30 minutes (the concentration of caustic alkali is 110g / L, the liquid-solid ratio is 7:1), and the lye is filtered to obtain product A;

[0036] 2) Mix the powdered bauxite and product A according to the mass ratio of 10:1, and make agglomerates (groups) to obtain product B;

[0037] 3) Dry product B, preheat it at 400°C, and then heat it up to 1000°C for 2.0 hours of dehydration to obtain product C;

[0038] 4) Mix product C with coke and iron filings at a mass ratio of 300: 5: 10, then send it to an electric arc smelting furnace for conventional smelting, and finally produce brown corundum finished products after cooling, grading, crushing and screening.

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PUM

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Abstract

The invention discloses a method for preparing brown corundum by using powdery bauxite and ash residues. The method comprises the following steps: 1) carrying out alkaline leaching on ash residues inan environment of 85-100 DEG C for 5-30 minutes, and filtering out alkali liquor to obtain a product A; 2) mixing the product A with powdery bauxite, and carrying out agglomeration to obtain a productB; 3) preheating the product B in an environment of 50-500 DEG C, then carrying out heating to 900-1150 DEG C, and carrying out calcining and dehydrating for 0.5-2.0 hours to obtain a product C; and4) mixing the product C with coke and scrap iron, feeding the mixture into an electric arc smelting furnace for smelting, and finally, carrying out cooling, grading, crushing and screening to preparethe brown corundum finished product. According to the method disclosed by the invention, the powdery bauxite and the ash residues are used as raw materials, recycling of ash residues is realized, andmeanwhile, the powdery bauxite which is not used as a smelting raw material is effectively utilized, so that production cost of brown corundum is reduced, and the selection range of raw materials is broadened.

Description

technical field [0001] The invention relates to a method for preparing brown corundum, in particular to a method for preparing brown corundum by using powdered bauxite and ash. Background technique [0002] Brown corundum, also known as corundum, is a kind of artificial corundum. The main chemical composition of brown corundum is Al 2 o 3 , its content is 95.00%-97.00%, and it also contains a small amount of Fe, Si, Ti, etc. Brown corundum is the most basic abrasive, because of its good grinding performance, it has a wide range of applications. [0003] The traditional brown corundum is produced by melting and reducing three raw materials of bauxite, carbon material and iron filings in an electric arc furnace. In the smelting process of brown corundum, high-quality natural massive bauxite is used, which enters the smelting process after being calcined and dehydrated. For denser lump ore, the temperature difference between the inside and outside of the smelting process is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622C04B35/64
CPCC04B35/10C04B35/62204C04B35/64C04B2235/405C04B2235/422C04B2235/661
Inventor 陈朝轶邹建飞兰苑培李军旗王林珠金会心毛小浩张铭
Owner GUIZHOU UNIV
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