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Method of extracting aluminium oxide from fly ash and simultaneously producing white carbon black

A technology of fly ash and alumina, applied in the directions of alumina/aluminum hydroxide, silicon oxide, silicon dioxide, etc., can solve the problems of easily polluted environment, complicated process, many by-products, etc., and achieves high activity and simple process. , the effect of improving the extraction rate

Inactive Publication Date: 2006-11-29
NORTH UNITED POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a method for extracting alumina from fly ash and co-producing white carbon black in order to solve the problems of complex process, many by-products, low extraction rate and easy pollution of the environment in the prior art

Method used

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  • Method of extracting aluminium oxide from fly ash and simultaneously producing white carbon black
  • Method of extracting aluminium oxide from fly ash and simultaneously producing white carbon black

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Embodiment 1: the method for co-producing white carbon black while extracting alumina from fly ash has the following steps:

[0025] 1. Grind the fly ash to 400 mesh, carry out mechanical magnetic iron removal, and then activate it by roasting at 600°C for 1 hour.

[0026] 2. Mix the activated fly ash and ammonium sulfate according to the requirements, according to the weight ratio of alumina and ammonium sulfate in the fly ash is 1:5, stir evenly, enter the reactor, and carry out solid phase reaction at 360°C , and the time is 1 hour.

[0027] 3. Add water to the above reactant, stir and leach for 20 minutes under normal pressure boiling state, and filter.

[0028] 4. Add ammonia gas (ammonia water) in proportion to the filtrate obtained in the previous step, and form a mixed precipitation of aluminum hydroxide and iron hydroxide with the molar ratio of alumina reaction amount in the fly ash to ammonia gas (ammonia water) as 1:7 and ammonium sulfate solution, after s...

Embodiment 2

[0034] Embodiment 2: the method for co-producing white carbon black while extracting alumina from fly ash has the following steps:

[0035] 1. Grind the fly ash to 500 mesh, carry out mechanical and magnetic iron removal, and then activate it by roasting at 700°C for 2 hours.

[0036] 2. Mix the activated fly ash and ammonium sulfate according to the requirements, according to the weight ratio of alumina and ammonium sulfate in the fly ash is 1:6, stir evenly, enter the reactor, and carry out solid phase reaction at 460 °C , and the time is 3 hours.

[0037] 3. Add water to the above reactant, stir and leach for 40 minutes under normal pressure boiling state, and filter.

[0038] 4. Add ammonia gas (ammonia water) in proportion to the filtrate obtained in the previous step, and form a mixed precipitation of aluminum hydroxide and iron hydroxide with the molar ratio of alumina reaction amount in the fly ash to ammonia gas (ammonia water) as 1:8 and ammonium sulfate solution, ...

Embodiment 3

[0043] Embodiment 3: the method for co-producing white carbon black while extracting alumina from fly ash has the following steps:

[0044] 1. Grind the fly ash to 450 mesh, carry out mechanical and magnetic iron removal, and then activate it by roasting at 650°C for 1.5 hours.

[0045] 2. Mix the activated fly ash and ammonium sulfate according to the requirements. According to the weight ratio of alumina and ammonium sulfate in the fly ash is 1:5.5, stir evenly, enter the reactor, and carry out solid-state reaction at 410°C , and the time is 2 hours.

[0046] 3. Add water to the above reactant, stir and leach for 30 minutes under normal pressure boiling state, and filter.

[0047] 4. Add ammonia gas (ammonia water) in proportion to the filtrate obtained in the previous step, and form a mixed precipitation of aluminum hydroxide and ferric hydroxide with the molar ratio of alumina reaction amount in the fly ash to ammonia gas (ammonia water) as 1:7.5 and ammonium sulfate sol...

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Abstract

A process for extracting alumina from powdered coal ash while generating white carbon black includes such steps as grinding powdered coal ash, activating, adding ammonium sulfate, reacting, adding water, filtering, filling ammonia gas into the filtered liquid to obtain the deposited mixture of aluminum hydroxide and iron hydroxide, adding the solution of sodium hydroxide to dissolve the aluminum hydroxide deposit, adding carbon to obtain pure aluminum hydroxide, and calcining to obtain Al2O3.

Description

technical field [0001] The invention relates to a process for comprehensive utilization of fly ash, in particular to a method for co-producing white carbon black while extracting alumina from fly ash. Background technique [0002] There are many thermal power plants in my country, which produce a large amount of fly ash every year. A million power plant discharges more than 2,500 tons of fly ash to nature every day, which brings great pressure to environmental protection. At present, the method of dealing with fly ash is mainly to make bricks or cement, but because it is rich in various substances such as alumina and silica, it has a very broad comprehensive utilization prospect. At present, there are mainly two types of processes for extracting alumina and other substances from fly ash: acid method and alkali method. However, because fly ash is a mixed material with potential volcanic ash reactivity, its structure has a high degree of polymerization and high bond energy. ...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01B33/18
Inventor 李禹
Owner NORTH UNITED POWER CO LTD
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