Flying ash processing method

A treatment method, fly ash technology, applied in the direction of protective devices against harmful chemicals, etc.

Active Publication Date: 2010-06-02
SHANGHAI ENVIRONMENTAL ENG DESIGN & RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The current single treatment technology is difficult to meet this new standard. How to stabilize the heavy metals in the incineration fly ash and reduce its harm to the environment is an important research topic

Method used

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Embodiment Construction

[0016] A fly ash treatment method of the present invention will be described in detail below in conjunction with a preferred embodiment.

[0017] According to a kind of fly ash processing method of the present invention, take the following steps:

[0018] A. At an ambient temperature of 20°C, weigh a certain amount of fly ash, add sodium phosphate, aluminum sulfate, chitosan and butylamine black medicine to the fly ash in sequence, and add an appropriate amount of water. The ratio is 1:1, at 200 rpm, stir in JB90-D electric mixer, stop stirring after 10 minutes, put it in an oven for drying after 24 hours, and control the temperature at 50°C , forming fly ash chelates.

[0019] B. In order to improve the reaction effect, kaolin is calcined at a temperature of 800°C for 6 hours to make metakaolin, and at the same time, sodium hydroxide is dissolved in water glass to make an alkali activator, and metakaolin is mixed with fly ash chelate. The ratio of kaolin to fly ash chelate ...

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Abstract

The invention relates to a flying ash processing method. The method comprises the following steps: A, weighting a certain amount of flying ash; sequentially adding sodium phosphate, aluminum sulfate, chitosan and butyl amine aerofloat to the flying ash; adding water to the flying ash in a ratio of 1:1; stirring; and then drying in an oven to form a flying ash chelate; B, for improving the reaction effect, calcining kaolin at a temperature of 800 DEG C for 6 hours to prepare metakaolin; dissolving sodium hydroxide in soluble glass to prepare an alkali activator; doping the metakaolin in the flying ash chelate in a ratio range of 3:5 to 3:2; adding the alkali activator to the mixture in a ratio of 0.7:1; C, guiding the mixed pulp into a die; compacting and demolding; and D, culturing for 4 weeks at a room temperature for a toxic test. The invention adopts the chemical medicaments to burn the flying ash and fully mixes with the flying ash, thereby fully trapping heavy metals in the flying ash and achieving the aim of stabilizing the heavy metals in the flying ash for a long time.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, and in particular relates to a new fly ash treatment method for treating incineration fly ash by using compound chemical agents. Background technique [0002] Incineration fly ash contains a large amount of toxic and harmful substances. Data show that the content of heavy metals in incineration fly ash has greatly exceeded the control standards for safe landfill admission. At present, the treatment of waste incineration fly ash mainly focuses on cement solidification, heat treatment of fly ash, and chemical fixation of fly ash. [0003] Existing technologies focus on treating fly ash with single cement and phosphate chelation. In 2008, the Ministry of Environmental Protection updated the pollution control standards for domestic waste landfills, that is, GB 16889-2008. The concentration of pollutants in the leachate of the fly ash in the field has been strictly regulated, and the fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/33A62D101/43A62D101/08
Inventor 王晓云李萍
Owner SHANGHAI ENVIRONMENTAL ENG DESIGN & RES INST CO LTD
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