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Method for recycling and comprehensively utilizing solid waste fly ash

A technology of fly ash and resource utilization, applied in chemical instruments and methods, titanium compounds, carbon compounds, etc., can solve problems such as low added value

Inactive Publication Date: 2019-10-08
张志兴
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Fly ash is the main solid waste discharged from coal-fired power plants. It has been used in building materials, construction, environmental protection, agricultural soil improvement and other fields in recent years, but its added value is low

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  • Method for recycling and comprehensively utilizing solid waste fly ash

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Embodiment Construction

[0011] The composition of a variety of fly ash is as follows:

[0012] Sulfur trioxide 0.91%, loss on ignition 1.96%, free calcium oxide 0.44%, silicon dioxide 56.67%, aluminum oxide 23.66%, iron oxide 8.96%, potassium oxide 1.06%, sodium oxide 0.46%, magnesium oxide 3.47%, Titanium dioxide 3.01%. Attach the fly ash mentioned above according to the instructions figure 1 In the ultrasonic washing and magnetic separation process shown, add 10kg of fly ash to water and wash and separate 100g of product 1 floating beads, 500g of product 2 magnetic beads, 1.5g of finished product 3 carbon powder under the action of ultrasonic waves, and dissolve the free alkali. Use a solid-liquid separation device to separate the solid matter for ash washing, and the liquid part enters the carbonization device to react with carbon dioxide, and precipitate to obtain 40g of product 4 calcium carbonate. After the supernatant is recycled for many times, when the concentration of the lye is close to t...

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Abstract

The invention provides a method for recycling and comprehensively utilizing solid waste fly ash, aiming to solve the problem of environmental pollution caused by the fly ash. The method treats the flyash in a multi-stage way to obtain products such as flying beads, magnetic beads, light calcium carbonate, titanium dioxide, aluminum hydroxide, silica, iron hydroxide and glass. The method includesthe processes of ultrasonic washing and magnetic separation, high-temperature solid-phase reaction, silica separation, titanium dioxide extraction, aluminum hydroxide extraction, and batching for glass production.

Description

technical field [0001] The invention relates to the treatment of industrial solid waste, belongs to the technical field of environmental protection, and in particular relates to a method for resourceful and comprehensive utilization of fly ash. Background technique [0002] Fly ash, the main solid waste discharged from coal-fired power plants, has been used in building materials, construction, environmental protection, agricultural soil improvement and other fields in recent years, but its added value is low. From the perspective of the composition of fly ash, it is mainly aluminosilicate glass or mullite, and Al in fly ash 2 o 3 The content is in the range of 20-50%. SiO 2 The content of Fe is usually 23.8~56%, Fe 2 o 3 The content of carbon is 6~35%, the content of carbon is 3~20%, the content of titanium dioxide is 1~4%, and the content of magnesium oxide is between 1~4%. The phase of fly ash is mainly composed of mullite (3Al 2 o 3 2SiO2 2 ) crystalline phase an...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C1/00C03C6/00C01B33/12C01F11/18C01G23/053C01F5/20C01G49/02C01F7/14C01D7/00C01B32/00C01G49/08
CPCC01B32/00C01B33/12C01D7/00C01F5/20C01F7/142C01F11/18C01G23/0532C01G49/02C01G49/08C03C1/00
Inventor 张志兴夏至青云张夏广益
Owner 张志兴