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Method for simultaneously extracting aluminum oxide from two aluminum-containing waste residues of fly ash and red mud

A technology of fly ash and alumina, which is applied in chemical instruments and methods, preparation of alumina/hydroxide, inorganic chemistry, etc., can solve the problems of difficulty and high cost of reuse of fly ash and red mud, and achieve improvement The effect of aluminum-silicon ratio, difficulty reduction, and high-efficiency extraction

Inactive Publication Date: 2019-12-06
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of high difficulty and high cost in the reuse of fly ash and red mud, the present invention provides a method for simultaneously extracting alumina from two aluminum-containing waste residues of fly ash and red mud

Method used

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  • Method for simultaneously extracting aluminum oxide from two aluminum-containing waste residues of fly ash and red mud
  • Method for simultaneously extracting aluminum oxide from two aluminum-containing waste residues of fly ash and red mud
  • Method for simultaneously extracting aluminum oxide from two aluminum-containing waste residues of fly ash and red mud

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Experimental program
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Effect test

Embodiment 1

[0030] In this embodiment, the content of alumina in fly ash is 32.94%, the content of silica is 40.91%, the content of alumina in red mud is 24.20%, and the content of silica is 17.60%. The specific process is as follows:

[0031] (1) Ingredients: Mix and grind fly ash, red mud and calcium sulfate evenly in a certain proportion, so that the mass ratio of aluminum to silicon is 1:1, and the molar ratio of calcium to aluminum is 1.3:1;

[0032] (2) Calcination activation: calcining the mixed material at 1000°C for 120min;

[0033] (3) Acid leaching: Grind the calcined clinker and leaching it with 1mol / L sulfuric acid, leaching at 90°C for 30 minutes, separating solid and liquid to obtain aluminum sulfate crude liquid, and the leaching rate of alumina is 92.30%;

[0034] (4) Calcium removal: Concentrate and crystallize the filtrate to precipitate calcium sulfate crystals, and dry and recycle the precipitate after filtration;

[0035] (5) Iron removal: Add 15% hydrogen peroxide ...

Embodiment 2

[0039] In this embodiment, the content of alumina in fly ash is 35.69%, the content of silica is 43.09%, the content of alumina in red mud is 21.26%, and the content of silica is 16.60%. The specific process is as follows:

[0040] (1) Ingredients: Mix and grind fly ash, red mud and calcium sulfate evenly in a certain proportion, so that the mass ratio of aluminum to silicon is 1.2:1, and the molar ratio of calcium to aluminum is 1:1;

[0041] (2) Calcination activation: calcining the mixed material at 1200°C for 150min;

[0042] (3) Acid leaching: After grinding the calcined clinker, it is leached with 1mol / L sulfuric acid, leached at a temperature of 90°C for 60 minutes, and separated from solid and liquid to obtain aluminum sulfate crude liquid. The leaching rate of alumina is 90.30%;

[0043] (4) Calcium removal: Concentrate and crystallize the filtrate to precipitate calcium sulfate crystals, and dry and recycle the precipitate after filtration;

[0044] (5) Iron removal...

Embodiment 3

[0048] In this embodiment, the content of alumina in fly ash is 38.04%, the content of silica is 42.91%, the content of alumina in red mud is 25.90%, and the content of silica is 19.68%. The specific process is as follows:

[0049] (1) Ingredients: Mix and grind fly ash, red mud and calcium sulfate evenly in a certain proportion, so that the mass ratio of aluminum to silicon is 1.3:1, and the molar ratio of calcium to aluminum is 1.4:1;

[0050] (2) Calcination activation: calcining the mixed material at 1200°C for 120min;

[0051] (3) Acid leaching: After grinding the calcined clinker, it is leached with 2mol / L sulfuric acid, leached at 90°C for 30 minutes, separated from solid and liquid to obtain aluminum sulfate crude liquid, and the leaching rate of alumina is 96.30%;

[0052] (4) Calcium removal: Concentrate and crystallize the filtrate to precipitate calcium sulfate crystals, and dry and recycle the precipitate after filtration;

[0053] (5) Iron removal: add 30% hydro...

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Abstract

The invention relates to a method for simultaneously extracting aluminum oxide from two aluminum-containing waste residues of fly ash and red mud, and belongs to the technical field of solid waste comprehensive utilization. A purpose of the present invention is to solve the problems of high recycling difficulty and high cost of fly ash and red mud. According to the method, the aluminum-silicon ratio in fly ash is increased by using red mud; desulfurized gypsum or calcium sulfate, fly ash and red mud are subjected to mixed calcination to activate the fly ash so as to improve the extraction rateof aluminum oxide; sulfur trioxide and sulfur dioxide released through calcination can be recycled to prepare sulfuric acid for a subsequent acid leaching process; and calcium sulfate can be recovered during aluminum sulfate impurity removal so as to achieve the recycling of the activating agent. According to the present invention, with the method, the three kinds of solid wastes can be treated at the same time while the extraction cost can be reduced.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of solid waste, and in particular relates to a method for simultaneously extracting alumina from two kinds of aluminum-containing waste residues, fly ash and red mud. Background technique [0002] With the continuous surge in demand for aluminum materials, my country's aluminum industry has developed rapidly, and the amount of bauxite mining has increased significantly. By 2015, China's bauxite output will reach 60 million tons, becoming the world's largest alumina producer, causing my country's bauxite resources to face a crisis of depletion. [0003] Fly ash is the solid particles collected by the dust collector at the tail of the boiler during the process of exhausting the flue gas after the pulverized coal is burned. The fly ash emitted by coal-fired power plants is transported to the ash yard for storage, part of which is used, and the rest is accumulated and stored. Among...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/32C01B17/74
CPCC01B17/745C01F7/32
Inventor 卫国强杨彬彬陶亚男段东红张忠林刘世斌
Owner TAIYUAN UNIV OF TECH
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