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A kind of production method of desiliconization fly ash

A production method, fly ash technology, applied in solid waste removal, alumina/aluminum hydroxide, etc., can solve problems such as complex process and high energy consumption

Active Publication Date: 2016-08-17
DATANG INT HIGH ALUMINA COAL R & D CENT
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the aluminum-silicon ratio of the desiliconized fly ash produced by this method is only 2.14 at the highest; the patent CN101913615A "a method for increasing the aluminum-silicon ratio of low-grade bauxite" discloses the use of crushing and grinding, adding solid sodium carbonate Roasting activation, leaching desiliconization, carbon content, additives and water recovery and other steps, finally obtain desiliconized fly ash with a high aluminum-silicon ratio, but the process of this method is relatively complicated and has the disadvantage of high energy consumption

Method used

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  • A kind of production method of desiliconization fly ash

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Embodiment

[0025] Examples 1-3 are as shown in the experiment numbers 1-3 in Table 1, and its specific production method is as described above, and each specific process parameter is shown in Table 1. With reference to the production method of the embodiment of the present invention 1-3, comparative example 4-5 is as shown in the experiment number 4-5 in table 1, and the technical process of its specific production method and each specific process parameter refer to table 1 (wherein, " -" means no such step):

[0026] Table 1

[0027]

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Abstract

The present invention provides a method for producing desiliconized fly ash, which comprises the following steps: 1) calcining and activating fly ash; 2) cooling the activated fly ash to room temperature, and mixing the activated fly ash with a concentration of 140-160 g 3) After cooling the fly ash slurry to 70-80°C, the temperature is 70-100°C and the concentration is 100-150g / L sodium hydroxide is mixed for reaction, and the reaction product is filtered, washed and dried to obtain desiliconized fly ash. The aluminum-silicon ratio of the desiliconized fly ash obtained by the production method of the desiliconized fly ash can reach 2.3-2.5, and the production method has the advantages of simple process, low cost and high aluminum-silicon ratio.

Description

technical field [0001] The invention relates to a production method of desiliconized fly ash, which belongs to the technical field of comprehensive utilization of fly ash. Background technique [0002] Fly ash is a solid waste produced after coal combustion in the power generation industry. The discharge and dumping of a large amount of fly ash has caused great harm to the environment, so the comprehensive utilization of fly ash is extremely important. At present, the comprehensive utilization of fly ash is mainly focused on the production of alumina by using fly ash. After continuous and painstaking research by technicians in this field, three commonly used processes for extracting alumina from fly ash have been found. They are acid method, ammonium sulfate method and pre-desilication-soda lime sintering method. In the process of using fly ash to produce alumina, the fly ash is pre-desiliconized to obtain desiliconized fly ash with a high aluminum-silicon ratio as a raw ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B09B5/00C01F7/02
Inventor 许学斌张战军杨会宾徐鹏公彦兵
Owner DATANG INT HIGH ALUMINA COAL R & D CENT
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