Method for simultaneously extracting aluminum oxide from coal ash and red mud

A technology of fly ash and alumina, which is applied in the field of extracting alumina from fly ash and red mud at the same time, can solve the problems of difficult utilization of fly ash, difficulty of red mud utilization, and high cost, so as to reduce the extraction cost , Improve the ratio of aluminum to silicon, reduce the effect of dosage

Inactive Publication Date: 2019-11-22
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems that the existing red mud utilization is difficult and the utilization method of fly ash is difficult, energy consumption is large, and the cost is high, the present invention provides a method for simultaneously extracting fly ash and alumina in red mud

Method used

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  • Method for simultaneously extracting aluminum oxide from coal ash and red mud

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Comparison scheme
Effect test

Embodiment 1

[0032] 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:

[0033] (1) Ingredients: Mix and grind fly ash, red mud, quicklime and sodium carbonate evenly in a certain proportion, so that the ratio of aluminum to silicon is 1:1, Na 2 O / Al 2 o 3 The ratio is 1:1, CaO / SiO 2 The ratio is 2:1;

[0034] (2) Calcination activation: calcining the mixed material at 1000°C for 120min;

[0035] (3) Alkali leaching: After the calcined clinker is ground, it is leached with 3% sodium carbonate solution, leached for 30 minutes at a temperature of 70°C, and solid-liquid separation is obtained to obtain crude sodium aluminate liquid, and the filter residue is washed three times, and the leaching rate of alumina in the filtrate is collected 90.65%;

[0036] (4) After desiliconization by adding calcium to the crude solution of s...

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, quicklime and sodium carbonate evenly in a certain proportion, so that the ratio of aluminum to silicon is 0.9:1, Na 2 O / Al 2 o 3 The ratio is 1.2:1, CaO / SiO 2The ratio is 2.2:1;

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

[0042] (3) Alkali leaching: After grinding the calcined clinker, leaching with 5% sodium carbonate solution, leaching at 80°C for 60 minutes, separating solid and liquid to obtain crude sodium aluminate liquid, washing the filter residue three times, collecting the leaching rate of alumina in the filtrate 93.64%;

[0043] (4) After desiliconization by adding calcium to the crude solution of sodium aluminate, the CO 2 The gas is pas...

Embodiment 3

[0046] 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:

[0047] (1) Ingredients: Mix and grind fly ash, red mud, quicklime and sodium carbonate evenly in a certain proportion, so that the ratio of aluminum to silicon is 1.1:1, Na 2 O / Al 2 o 3 The ratio is 0.5:1, CaO / SiO 2 The ratio is 2.5:1;

[0048] (2) Calcination activation: Calcinate the mixed material at 900°C for 100min;

[0049] (3) Alkali leaching: After grinding the calcined clinker, leaching with 6% sodium carbonate solution, leaching at 60°C for 40 minutes, separating solid and liquid to obtain crude sodium aluminate liquid, washing the filter residue three times, collecting the leaching rate of alumina in the filtrate 89.16%;

[0050] (4) After adding calcium to desiliconization of sodium aluminate crude solution, CO 2 The gas is passed into th...

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Abstract

The invention discloses a method for simultaneously extracting aluminum oxide from coal ash and red mud. The invention belongs to the field of solid waste comprehensive utilization. The problems of high red mud utilization difficulty, and high difficulty, high energy consumption and high cost of a coal ash utilization method can be solved. According to the invention, the coal ash, the red mud, quick lime and sodium carbonate are mixed and calcined and activated at 700-1400 DEG C, and gas CO2 generated by calcination can be used for preparing Al(OH)3 in the sodium aluminate solution seed precipitation process; and the clinker is ground and leached with a 1-10% sodium carbonate solution, solid-liquid separation is carried out after leaching to obtain a sodium aluminate crude solution, and desilicication, seed precipitation, filtration and calcination are performed on the sodium aluminate crude solution to obtain the alumina product. The red mud is added to increase the aluminum-silicon ratio in the fly ash, CaO and Na2O in the red mud are utilized to activate mullite, the consumption of quick lime and sodium carbonate of the activating agent is reduced, the extraction cost of the flyash aluminum oxide is reduced while the extraction rate of the aluminum oxide is increased, and efficient utilization of the two solid wastes is realized.

Description

technical field [0001] The invention belongs to the technical field of solid waste comprehensive utilization, and specifically designs a method for simultaneously extracting alumina from 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 them, the comprehensive utilization rate in Shanxi, Inn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/04C01F7/20
CPCC01F7/04C01F7/20
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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