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Method for preparing aluminium hydroxide and alumina by using waste residue rich in aluminium

A technology of aluminum hydroxide and waste residue, applied in the directions of alumina/aluminum hydroxide, chemical instruments and methods, aluminum compounds, etc., can solve problems such as environmental pollution, and achieve the effects of reducing pollution, simple production process and high purity

Inactive Publication Date: 2006-11-22
方荣利
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the rapid development of industry, more and more aluminum-rich waste (AL 2 o 3 Fly ash, coal gangue and other industrial waste residues, poor bauxite, tailings, etc.) with a content ≥ 15% are not only not utilized, but some also cause serious environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for preparing aluminum hydroxide using aluminum-rich waste slag mainly consists of the following steps:

[0024] (a) Activation of raw materials and self-pulverization of calcination Activated material: 105g of dried fly ash and 263g of crushed limestone (weight composition is 28.5% fly ash, 71.5% limestone, CaO / SiO 2 2.4) After mixing, grind to a fineness of 4900 mesh and the sieve residue is less than 6%, add water to form a ball, calcinate at 1260℃±10℃ for 3 hours, cool in air, the calcined material self-powder rate is 100%, self-pulverized material The average particle size is 0.6μm.

[0025] (b)Na 2 CO 3 The aqueous solution is leached from the powdered material: weigh 100g from the powdered material, and add 10% Na by weight 2 CO 3 400g aqueous solution, mixed, leached for 1 hour under full stirring, and filtered;

[0026] (c) Efficient dispersant-carbonization method to prepare AL(OH) from the leaching solution 3 :Take 100g of the leaching liquid filtrate, a...

Embodiment 2

[0028] A method for preparing aluminum hydroxide using aluminum-rich waste slag mainly consists of the following steps:

[0029] (a) Activation of raw materials and self-pulverization of calcination activated materials: 122g of dried coal gangue particles and 229g of limestone particles (weight composition of 34.8% coal gangue, 65.2% limestone, CaO / SiO 2 2.2) After mixing, grind to a fineness of 4900 mesh and the sieve residue is less than 6%, add water to form a ball, calcinate at 1280 ℃ ± 10 ℃ for 2 hours, cool in air, the calcined material self-powder rate is 100%, self-pulverized material The average particle size is 0.7μm.

[0030] (b)Na 2 CO 3 The aqueous solution is leached from the powdered material: weigh 100g from the powdered material, and add 6% Na by weight 2 CO 3 500g aqueous solution, mixed, leached for 2 hours under full stirring, and filtered;

[0031] (c) Efficient dispersant-carbonization method to prepare AL(OH) from the leaching solution 3 : Take 100g of the lea...

Embodiment 3

[0033] A method for preparing aluminum hydroxide using aluminum-rich waste slag mainly consists of the following steps:

[0034] (a) Activation of raw materials and self-pulverization of calcination activated materials: 118g of dried bauxite tailings and 240g of limestone particles (weight composition is 33% bauxite tailings, 67% limestone, CaO / SiO 2 2.3) After mixing, grind to a fineness of 4900 mesh and the sieve residue is less than 6%, add water to form a ball, calcinate at 1290℃±10℃ for 1 hour, cool in air, the calcined material self-powder rate is 100%, self-pulverized material The average particle size is 0.65μm.

[0035] (b)Na 2 CO 3 The aqueous solution is leached from the powdered material: weigh 100g from the powdered material, and add 15% Na by weight 2 CO 3 300g aqueous solution, mixed, leached for 12 hours under full stirring, and filtered;

[0036] (c) Efficient dispersant-carbonization method to prepare AL(OH) from the leaching solution 3 : Take 100g of the filtrat...

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Abstract

A method for preparing aluminum hydroxide and alumina by using aluminum-rich waste residue, including Al in raw materials such as aluminum-rich waste residue 2 o 3 Activation, self-pulverization of calcined activation material, Na 2 CO 3 NaAlO 2 form leached Al 2 o 3 , high-efficiency composite dispersant-carbonization method or microemulsion-high-efficiency composite dispersant-carbonization method to prepare ultra-fine high-purity Al(OH) from leaching solution 3 , Preparation of ultrafine Al by spray pyrolysis 2 o 3 Waiting for the process. The invention not only turns waste into wealth, but also reduces environmental pollution by aluminum-rich waste slag; the production process is simple, the cost is low, the product has small particle size, high purity and good product quality.

Description

Technical field [0001] The invention belongs to a method for preparing aluminum compounds, and relates to a method for preparing aluminum hydroxide and aluminum oxide by using aluminum-rich waste slag. Background technique [0002] In the prior art, the preparation method of aluminum hydroxide and aluminum oxide is generally to mix bauxite powder containing more than 60% alumina with raw materials such as sodium carbonate and limestone powder, and sinter in a kiln. The calcium aluminate clinker is After crushing and grinding, it is leached with sodium carbonate solution, and carbon dioxide is introduced into the leaching solution to precipitate aluminum hydroxide; this method requires high-quality bauxite powder with more than 60% aluminum oxide, and the produced product has a large particle size (more than 100μm) ), low purity (the content of aluminum hydroxide is less than 88.5%, weight percentage, the same later), and the production cost is high. With the rapid development of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02C01F7/20B09B3/00
Inventor 方荣利
Owner 方荣利