Co-processing method for red mud and household garbage incineration fly ash

A domestic waste incineration and co-processing technology, applied in the direction of combustion method, incinerator, combustion type, etc., can solve the problems of high curing cost of cement or chelating agent, poor long-term stability of solidified body, high energy consumption and high cost of curing, and achieve suitable Large-scale promotion, stable and safe cured body, and low leaching toxicity

Active Publication Date: 2016-02-03
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The curing cost of cement or chelating agent is high and the long-term stability of the solidified body is poor; the energy consumption and cost of high-temperature melting and curing of plasma torch are high; the co-processing of cement kiln is limited by the transportation distance
The method of co-processing red mud and domestic waste incineration fly ash has not been reported yet

Method used

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  • Co-processing method for red mud and household garbage incineration fly ash
  • Co-processing method for red mud and household garbage incineration fly ash
  • Co-processing method for red mud and household garbage incineration fly ash

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A method for co-processing red mud and domestic waste incineration fly ash, comprising the following steps:

[0028] (1) Preparation of heavy metal curing agent: dry the red mud, grind it through a sieve with a pore size of 0.3mm, mix the sieved red mud with 10% sodium hydroxide, and calcinate at 750°C for 3 hours, after cooling Obtain the heavy metal curing agent. The red mud is taken from a certain place in Henan, and its main chemical composition is 20.38% SiO 2 , 24.50%Al 2 o 3 , 9.48% Fe 2 o 3 , 11.46% Na 2 O, 12.86% CaO, loss on ignition at 1200°C is 15.40%.

[0029] (2) Prepare clean slurry: mix the heavy metal solidifying agent prepared in step (1) with domestic waste incineration fly ash to obtain a mixture powder, and the mass ratio of the heavy metal solidifying agent in the mixture powder is 45%; According to the water-cement ratio of 0.4, add water and stir evenly to obtain a clean slurry; the fly ash is taken from a waste incineration plant in Hubei...

Embodiment 2

[0034] A method for co-processing red mud and domestic waste incineration fly ash, comprising the following steps:

[0035] (1) Preparation of heavy metal curing agent: dry the solid or semi-solid red mud, grind it through a sieve with an aperture of 0.4mm, mix the sieved red mud evenly with 12.5% ​​sodium hydroxide, and calcinate at 800°C After cooling for 2 hours, the activated pretreated red mud was obtained. The red mud is taken from a certain place in Henan, and its main chemical composition is 20.38% SiO 2 , 24.50%Al 2 o 3 , 9.48% Fe 2 o 3 , 11.46% Na 2 O, 12.86% CaO, loss on ignition at 1200°C is 15.40%.

[0036] (2) Prepare clean slurry: mix the heavy metal solidifying agent prepared in step (1) with domestic waste incineration fly ash to obtain a mixture powder, and the mass ratio of the heavy metal solidifying agent in the mixture powder is 50%; According to the water-cement ratio of 0.5, add water and stir evenly to obtain a clean slurry; the fly ash is taken...

Embodiment 3

[0041] A method for co-processing red mud and domestic waste incineration fly ash, comprising the following steps:

[0042] (1) Preparation of heavy metal curing agent: dry the solid or semi-solid red mud, grind it through a sieve with an aperture of 0.5mm, mix the sieved red mud with 15% sodium hydroxide, and calcinate at 850°C After cooling for 1 hour, the activated pretreated red mud was obtained. The red mud is taken from a certain place in Henan, and its main chemical composition is 20.38% SiO 2 , 24.50%Al 2 o 3 , 9.48% Fe 2 o 3 , 11.46% Na 2 O, 12.86% CaO, loss on ignition at 1200°C is 15.40%.

[0043] (2) Prepare clean slurry: mix the heavy metal solidifying agent prepared in step (1) with domestic waste incineration fly ash to obtain a mixture powder, and the mass ratio of the heavy metal solidifying agent in the mixture powder is 60%; According to the water-cement ratio of 0.6, add water and stir evenly to obtain a clean slurry; the fly ash is taken from a wast...

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Abstract

The invention discloses a co-processing method for red mud and household garbage incineration fly ash. The co-processing method is characterized by comprising the following steps that (1) the red mud is ground into powder after being dried, 10wt%-15wt% of strong base is added, and calcined activation is carried out between 750 DEG C and 850 DEG C, and a heavy metal curing agent is obtained after cooling; (2) the heavy metal curing agent and the household garbage incineration fly ash are mixed to obtain mixture powder, the mass proportion of the heavy metal curing agent in the mixture powder ranges from 45% to 60%, and net paste is obtained by adding water to the mixture powder according to the water-ash ratio ranging from 0.4 to 0.6 and evenly mixing the water and the mixture powder; and (3) the net paste is cured for 14 to 28 days under the normal temperature and the normal pressure, and a garbage incineration fly ash composite solidified body is obtained. Through the method, the red mud and the household garbage incineration fly ash can be processed at the same time, the solidification effect is stable, the steps are simple and easy to implement, and the method is suitable for being popularized on a large scale.

Description

technical field [0001] The invention belongs to the field of waste treatment, and more specifically relates to a co-processing method of red mud and domestic waste incineration fly ash. Background technique [0002] Red mud (Red Mud) is an insoluble industrial solid waste discharged from alumina plants after alkaline treatment of bauxite. Usually, producing one ton of alumina will produce 1-2 tons of red mud. At present, the discharge of red mud in my country has exceeded 30 million tons, which belongs to bulk industrial waste. Red mud has small particle size, large specific surface area, high moisture content, and high alkali content (Na 2 O content) and other characteristics, it belongs to strong alkali waste residue, and is a serious source of alkaline pollution. The stockpiling of red mud occupies a large amount of land, and the highly alkaline leachate poses a serious threat to the surrounding soil and groundwater. At the same time, due to the strong alkalinity, it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23G7/00
Inventor 杨家宽陈烨叶楠梁莎胡勇吴旭虞文波张伟胡雨辰时亚飞王俊雄喻文昊
Owner HUAZHONG UNIV OF SCI & TECH
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