Desiliconization method of high alumina fly ash

A technology of high-aluminum fly ash and fly ash, which is applied in the field of solid waste resource utilization, can solve problems such as the inability to achieve low-cost desiliconization of fly ash, and achieve the benefits of large-scale production and application, improve desiliconization efficiency, The effect of increasing the Al-Si ratio

Active Publication Date: 2020-09-29
INNER MONGOLIA RISHENG RENEWABLE RESOURCES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] For this reason, the technical problem to be solved by the present invention is to provide a method for desiliconization of high-alumina fly ash, which solves the problem that in the prior art, it is impossible to realize large-scale desilication treatment under mild conditions, low cost, and using popular equipment. And the technical problem of obtaining desiliconized fly ash with high silicon-aluminum ratio

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  • Desiliconization method of high alumina fly ash

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Embodiment 1

[0056] This embodiment is a method for desiliconization of high-alumina fly ash, comprising the following steps:

[0057] (1) Mix the fly ash and lye into the pre-blending tank through the belt scale and flow meter according to the solid content of 0.25 (mass ratio of fly ash to lye). The lye index is: 110g / l. After the coal ash is fed, stir for 30 minutes, and check whether the solid content index of the slurry reaches 0.25;

[0058] (2) Pump the blended slurry that meets the index into the pre-desilication tank, open the steam valve to start heating, when the temperature reaches 95°C, close the steam valve, and when the temperature reaches 102°C, close the steam valve, start to keep warm, and keep warm for 1 hour;

[0059] (3) Open the feed valve of the primary desiliconization chamber filter press and the feed valve of the sodium silicate solution tank, close the air compressor and water washing valve; pump the desiliconization slurry that has been kept warm into the primar...

Embodiment 2

[0075] This embodiment is a method for desiliconization of high-alumina fly ash, comprising the following steps:

[0076] (1) Mix the fly ash and lye into the pre-blending tank through the belt scale and flow meter according to the solid content of 0.17 (mass ratio of fly ash to lye), the lye index is: 80g / l, lye and powder After the coal ash is fed, stir for 30 minutes, and check whether the solid content index of the slurry reaches 0.17;

[0077] (2) Pump the blended slurry that meets the index into the pre-desilication tank, open the steam valve to start heating, when the temperature reaches 90°C, close the steam valve, and when the temperature reaches 95°C, close the steam valve, start heat preservation, and keep heat for 1 hour;

[0078] (3)-(9) are the same as embodiment 1;

[0079] (10) When the slurry in the secondary desiliconization tank reaches the corresponding volume, open the coil to raise the temperature. When the temperature reaches 90°C, close the steam valve...

Embodiment 3

[0085] This embodiment is a method for desiliconization of high-alumina fly ash, comprising the following steps:

[0086] (1) Mix the fly ash and lye into the pre-blending tank through the belt scale and flow meter according to the solid content of 0.33 (mass ratio of fly ash to lye). The lye index is: 120g / l. After the coal ash is fed, stir for 30 minutes, and check whether the solid content index of the slurry reaches 0.33;

[0087] (2) Pump the blended slurry that meets the index into the pre-desilication tank, open the steam valve to start heating, when the temperature reaches 100°C, close the steam valve, and when the temperature reaches 105°C, close the steam valve, start to keep warm, and keep warm for 1 hour;

[0088] (3)-(9) are the same as embodiment 1;

[0089] (10) When the slurry in the secondary desiliconization tank reaches the corresponding volume, open the coil to raise the temperature. When the temperature reaches 100°C, close the steam valve. When the tempe...

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Abstract

The invention provides a desiliconization method of high-alumina fly ash. The desiliconization method comprises the following steps: (1) mixing high-alumina fly ash with alkali liquor having a concentration of 80-120 g / l according to a mass ratio of 1: (2-5), and carrying out normal-pressure desiliconization treatment at a reaction temperature of 95-105 DEG C for 0.5-3 hours; (2) carrying out liquid-solid separation on a reaction product obtained in the step (1) so as to obtain a desilicication solution and a filter cake; (3) activating the filter cake product to obtain an activated filter cake; and (4) mixing the activated filter cake obtained in the step (3) with alkali liquor, and repeating the steps (1) to (3) one to three times to obtain a desilicication product. The method disclosedby the invention solves the technical problem that large-scale desilicication treatment cannot be realized by adopting common equipment at low cost under a mild condition and desilicication fly ash with a high silica-alumina ratio cannot be obtained in the prior art.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of solid waste, and in particular relates to a method for desiliconization of high-alumina fly ash. Background technique [0002] Fly ash, also known as fly ash, is a powdery substance whose particles are so fine that it can flow in the air and be collected by special equipment. Usually referred to as fly ash is the pulverized coal in the coal-fired power plant, which is discharged from the flue after being burned in the boiler and collected by the dust collector. Fly ash is mostly gray-brown or gray-white, usually acidic, with a specific surface area of ​​2500-7000cm 2 / g, the particles are usually spherical, and the size ranges from a few microns to hundreds of microns. [0003] The generation of fly ash mainly includes the stages of pulverized coal combustion, ash sintering and fragmentation, particle melting, and quenching into beads. In the combustion stage of pulverized coal,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/06
CPCC01F7/0693
Inventor 王志平
Owner INNER MONGOLIA RISHENG RENEWABLE RESOURCES CO LTD
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