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Method for producing alumina by coal gangue

A coal gangue and aluminate technology, which is applied in the field of alumina production from coal gangue, can solve the problems of product purity decline and high production cost, and achieve the effect of improving purity and avoiding environmental pollution

Inactive Publication Date: 2006-07-12
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The above methods have certain requirements on raw materials, especially raw materials with relatively high impurity content such as iron and titanium, and their production costs are relatively high, resulting in a decrease in product purity.
In addition, the environmental pollution problems caused by acid method, acid precipitation method and salt precipitation method are also relatively serious.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh Al 2 o 3 100g of 32.8% coal gangue, crushed to 80 mesh, with 30g Na 2 CO 3 Mix and roast in a high-temperature furnace at 800°C for 30 minutes; weigh 20 g of the roasted coal gangue raw material, and mix it with 5% sodium hydroxide solution at a solid-to-liquid ratio of 1:9; leaching twice at 75°C to 80°C, The first leaching time is 40 minutes. After the first leaching, pour out the upper clarified liquid, and then add new lye for the second leaching. After the leaching is completed, quickly filter the two leaching liquids and residues. , and wash the residue 3 times with hot water; take out the filtrate, and use CO 2 Adjust the pH value of the solution to make the precipitation complete, then vacuum filter and dry; then bake in a muffle furnace at 300°C for 60 minutes, cool, weigh, and calculate the leaching rate of alumina (see Table 1).

Embodiment 2

[0022] Weigh Al 2 o 3 100g of 32.8% coal gangue, crushed to 80 mesh, with 30gNa 2 CO 3 Mix and roast in a high-temperature furnace at 800°C for 30 minutes; weigh 20g of roasted coal gangue raw material, mix it with 5% sodium hydroxide solution at a solid-to-liquid ratio of 1:9; leaching twice at 75°C to 80°C, each The leaching time is 20 minutes. After the first leaching, pour out the clarified liquid in the upper layer, and then add new lye for the second leaching. After the leaching is completed, quickly filter the two leaching liquids and residues. And wash the residue twice with hot water; take out the filtrate, pass into CO 2 Make the precipitation complete, filter with suction and wash the precipitate with a large amount of water, dry it, bake it in a muffle furnace at 300°C for 60 minutes, cool it, weigh it, and calculate the leaching rate of alumina (see Table 1).

[0023] Example

[0024] project

[0025] Reach the national standard first-clas...

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Abstract

The invention discloses an alumina making method at raw material of coal gangue, which comprises the following steps: grinding the coal gangue; leaching the coal gangue through sodium hydroxide solution after sintering at high temperature; filtering the residual; producing Al (OH) 3 deposition the residual through carbon dioxide; dewatering Al (OH) 3 to produce Al2O3 at high temperature. The procedure is easy to control to recycle the technological waste water, which realizes zero drainage of industrial production.

Description

technical field [0001] The present invention relates to the oxide of aluminum, specifically belongs to a kind of production aluminum oxide (Al 2 o 3 )Methods. Background technique [0002] The method of producing alumina from kaolin and coal gangue has been reported. For example: CN1035505C discloses a method for producing alumina, which is to sinter the raw materials with ammonium sulfate after pre-roasting and dehydration, leaching with dilute sulfuric acid, neutralizing the alum liquid with ammonia gas, and calcining the hydrate to obtain alumina products. CN1083023 discloses the process of producing alumina by the acid analysis method, which is to add the mineral after roasting and dehydration, add ammonium bisulfate to sulfuric acid mixture, i.e. ammonium sulfate solution to leaching to obtain ammonium alum, pass into hydrogen chloride gas to precipitate crystalline aluminum chloride, and obtain after pyrolysis alumina. The salting-out method disclosed in CN1126177 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/08
Inventor 张智敏王自为任建国李军平郑养珍
Owner SHANXI UNIV
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