Method for comprehensive utilization of aluminum-containing material

A material and scheme technology, applied in ammonium sulfate, alumina/aluminum hydroxide, silica and other directions, can solve problems such as environmental pollution, and achieve the effects of low equipment requirements, simple process flow and low production cost

Inactive Publication Date: 2012-04-25
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The above-mentioned treatment processes focus on recovering alumina in aluminum-containing materials, and other substances are discharged as waste residues, causing environmental pollution

Method used

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  • Method for comprehensive utilization of aluminum-containing material
  • Method for comprehensive utilization of aluminum-containing material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The main composition of fly ash used is: Al 2 O 3 41.4%, SiO 2 46.3%, Fe 2 O 3 5.1%, CaO 2.9%, TiO 2 1.1%, MgO 0.3%, others 2.9%.

[0049] After the fly ash, which has been crushed and ground down to 80μm or less, is magnetically separated for iron removal, it is mixed with ammonium bisulfate at a mass ratio of 1:1.6. The material is roasted and reacted at 350°C for 4 hours. Ammonia and trioxide generated during the reaction The sulfur is absorbed by dilute sulfuric acid to obtain an ammonium aluminum sulfate solution, which is evaporated and crystallized and returned for roasting.

[0050] The roasting clinker is dissolved with water, the mass ratio of water to clinker is 6:1, and the solution is dissolved at 95°C for 30 minutes, and filtered to obtain aluminum extraction slag and aluminum ammonium sulfate solution. After washing and drying, the aluminum extraction slag is directly used as a micro-silica powder product.

[0051] The ammonium aluminum sulfate solution is ...

Embodiment 2

[0053] The main composition of bauxite used is: Al 2 O 3 38.9%, SiO 2 33.9%, Fe 2 O 3 14.9%, CaO 3.6%, MgO 2.4%, TiO 2 1.4%, K 2 O 0.9%, others 4.0%.

[0054] The crushed and ground high-iron bauxite and ammonium bisulfate with a mass ratio of 1:2.2 are uniformly mixed, and the material is roasted at 375°C for 3.5 hours. The gas released during the reaction is absorbed by dilute sulfuric acid to obtain ammonium aluminum sulfate. The solution, evaporation and crystallization are returned for roasting.

[0055] The roasted clinker is cooled and dissolved by adding water, the mass ratio of water to clinker is 5:1, and dissolved at 90°C for 40 minutes, and filtered to obtain aluminum extraction slag and crude aluminum ammonium sulfate solution. After washing and drying, the aluminum extraction slag becomes a micro silicon powder product.

[0056] The crude aluminum ammonium sulfate solution was oxidized by adding hydrogen peroxide at 35°C. After 0.5h of reaction, the yellow ammonium...

Embodiment 3

[0058] The main composition of alunite used is: Al 2 O 3 31.82%, SiO 2 23.48%, Fe 2 O 3 0.44%, SO 3 24.61%, K 2 O6.18%, TiO 2 0.1%, Na 2 O 0.59%, others 12.78%.

[0059] The alunite that has been crushed and ground to below 80μm is calcined and dehydrated at 700°C for 4 hours, then mixed with ammonium bisulfate at a mass ratio of 1:1.7, and kept at 400°C for 3 hours. The gas released during the reaction is absorbed by sulfuric acid to obtain The ammonium aluminum sulfate solution is evaporated and crystallized back for roasting.

[0060] The calcined clinker is dissolved with water, the mass ratio of water to clinker is 4:1, and the mixture is dissolved at 85°C for 50 minutes, filtered, and the filter residue is washed and dried as a microsilica product; the filtrate is an ammonium aluminum sulfate solution for further extraction of aluminum.

[0061] Add saturated ammonium bicarbonate solution to the ammonium aluminum sulfate solution at 60°C, control the pH value of the ammoni...

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Abstract

The invention relates to a method for preparing aluminum oxide and other products by aluminum-containing materials of bauxite, alunite, nepheline, fly ash, kaolin, coal gangue and clay. The method comprises the following steps: (1) crushing and grinding an aluminum-containing material, carrying out mixing and baking for the treated aluminum-containing material and ammonium bisulfate; (2) carryingout dissolution and filtering for the baked clinker to obtain a crude ammonium aluminum sulfate solution and aluminum extracting residue; (3) carrying out an iron precipitating treatment for the ammonium aluminum sulfate solution with the concentration more than 1 g/L by adopting a jarosite method, then carrying out an iron precipitating treatment by a goethite method, carrying out an aluminum precipitating treatment for the resulting solution, carrying out calcination for the resulting aluminium hydroxide to prepare aluminum oxide; (4) carrying out an iron precipitating treatment for the ammonium aluminum sulfate solution with the concentration less than 1 g/L by adopting the goethite method, and carrying out an aluminum precipitating treatment to prepare aluminum oxide, or adopting a recrystallization method to carry out purification, adopting a reaction of the ammonium aluminum sulfate crystal and a ammonium carbonate solution to precipitate the aluminum to obtain ammonium aluminumcarbonate, carrying out calcination for the ammonium aluminum carbonate, and adopting a Bayer method to treat the calcined ammonium aluminum carbonate to prepare sandy aluminum oxide; (5) washing anddrying the aluminum extracting residue, wherein the dried aluminum extracting residue is adopted as the silicon dioxide product.

Description

technical field [0001] The invention relates to a method for processing aluminum-containing materials, in particular to a method for separating and extracting aluminum, silicon and iron from bauxite, alunite, nepheline, fly ash, kaolin, coal gangue and clay to prepare alumina, Silica, iron oxide products, a method to realize the comprehensive development and utilization of aluminum-containing resources. Background technique [0002] Bauxite, alunite, nepheline, fly ash, kaolin, coal gangue, and clay aluminium-containing materials are aluminium-containing minerals or aluminium-containing solid wastes. Aluminum methods are mainly divided into four categories: alkaline method, acid method, acid-base combined method and thermal method. [0003] Alkali production of alumina is to treat bauxite with alkali (sodium hydroxide and sodium carbonate), so that the alumina in the ore becomes sodium aluminate, and iron and most of the silicon become insoluble compounds. After dissolutio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12C01F7/02C01C1/24C01G49/02
Inventor 翟玉春辛海霞王佳东申晓毅王伟王若超
Owner NORTHEASTERN UNIV
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