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Refuse incineration flying ash metallurgy sintering treatment fixing agent

A waste incineration fly ash and sintering treatment technology, which is applied in the field of stabilizers, can solve the problems of water pollution and unstabilized treatment, and achieve the effect of reducing leaching toxicity

Inactive Publication Date: 2009-08-19
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above patents can only stabilize dioxins or heavy metals alone, but cannot stabilize two toxic substances at the same time; in addition, several methods involve the preparation of related solutions, which easily cause water pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In the present embodiment, the content of each component of the stabilizer is by mass percentage:

[0031] Fe 2 o 3 25%

[0032] CaO 27%

[0033] h 3 BO 3 4%

[0034] C 2 FeO 4 2H 2 O 6%

[0035] C 12%

[0036] SiO 2 8%

[0037] al 2 o 3 7%

[0038] MgO 7%

[0039] CnH 2 n+2 4%

[0040] The mass ratio of stabilizer to fly ash is 2:1000.

[0041] In this embodiment, the stabilizer is evenly sprayed in the fly ash, and the fly ash is blended into the metallurgical iron-containing powder according to the proportion of about 5% (15% of gas ash, 25% of converter dust, 22% of sulfuric acid slag, 20% of other materials, 8% of solvent, and 5% of binder), and use pelletizing equipment to make pellets with a particle size of 5-12 mm. The pellets were maintained under natural conditions for 3 days, and the leaching toxicity test was carried out. The leaching tox...

Embodiment 2

[0043] In the present embodiment, the content of each component of the stabilizer is by mass percentage:

[0044] Fe 2 o 3 twenty two%

[0045] CaO 27%

[0046] h 3 BO 3 5%

[0047] C 2 FeO 4 2H 2 O 7%

[0048] C 15%

[0049] SiO 2 8%

[0050] al 2 o 3 7%

[0051] MgO 6%

[0052] CnH 2 n+2 3%

[0053] The mass ratio of stabilizer to fly ash is 3:1000.

[0054] In this embodiment, the stabilizer is evenly sprayed in the fly ash, and the fly ash is blended into the metallurgical iron-containing powder according to the proportion of about 8% (15% of gas ash, 25% of converter dust, 22% of sulfuric acid slag, 17% of other materials, 8% of solvent, and 5% of binder), and utilize pelletizing equipment to make pellets with a particle size of 5-12 mm. The pellets were maintained under natural conditions for 3 days, and the leaching toxicity test was carried out. The le...

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Abstract

The invention relates to a waste incineration flying ash metallurgical sintering stabilizer which is formed by mixing the following components with the mass percent: 20-30% of Fe2O3, 5-35% of CaO, 1-5% of H3BO3, 1-8% of C2FeO4.2H2O, 5-15% of C, 5-10 % of SiO2, 3-10% of Al2O3, 5-10% of MgO and 3-10% of CnH2n+2. The stabilizer is added into waste incineration flying ash according to a certain proportion, so as to lead dioxin in the flying ash to be in a stable state at the temperature below 500 DEG C and ensure elements such as chromium, cadmium and the like to exist as a compound with a stable form, thus reducing the extracting toxicity of the waste incineration flying ash and greatly reducing the possibility of pollution caused by dissolving out the dioxin and heavy metal that are produced in the process of transportation, pelletization, cold solidification and sintering.

Description

technical field [0001] The invention relates to a stabilizer, in particular to a stabilizer for dioxin and heavy metals (especially chromium, cadmium, etc.) in waste incineration fly ash. Background technique [0002] Waste incineration fly ash contains a certain amount of dioxin and metal chromium. These two substances are important reasons for the toxicity of waste incineration fly ash. Therefore, how to make the two substances exist stably and remove them under certain conditions is directly related to Harmless treatment effect of waste incineration fly ash. [0003] Dioxin has strong fat solubility and high stability, and is easy to accumulate in organisms through the food chain. A large number of animal experiments have shown that very low concentrations of dioxins can show lethal effects on animals; PCDDs and PCDFs exposure can cause skin acne, headache, deafness, depression, insomnia, weight loss, thymus atrophy and other symptoms, and have long-term effects. Effect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/22B09B3/00
Inventor 刘清才魏勤聪文娟郑惠敏
Owner CHONGQING UNIV
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