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A plasma melted flying ash vitrification method based on adjustment of the ratio of CaO-Al2O3-SiO2 three phases

A plasma and proportional adjustment technology, applied in chemical instruments and methods, solid waste removal, transportation and packaging, etc., can solve problems such as secondary pollution, and achieve the effect of reducing treatment costs, lowering melting temperature, and reducing volatilization of heavy metals

Pending Publication Date: 2018-12-04
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, not all fly ash can be melted to form glassy slag, and the volatile heavy metals in fly ash (such as Cd, Pb, Cu, etc.) are easy to volatilize into the exhaust gas under high temperature conditions, causing secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Get a kind of domestic waste incineration fly ash, its main chemical composition is CaO 38.4%, Cl 20.2%, K 2 O8.1%, Na 2 O 7.9%, SO 3 7.3%, SiO 2 4.9%, MgO 2.6%, Fe 2 o 3 2.5%, ZnO 1.6%, Al 2 o 3 3.4%, TiO 2 1.0% and some trace substances, converted into CaO, Al 2 o 3 , SiO 2 The sum of the three phases is 100%, then the three-phase ratio of CAS is CaO 82.2%, Al 2 o 3 7.3%, SiO 2 10.5%;

[0021] (2) Weigh 20g of incineration fly ash samples, add 27.5g of crushed glass powder, fully mix and grind to 100 mesh, the chemical composition of the sample after mixing pretreatment is SiO 2 43.3%, CaO 20.5%, Al 2 o 3 4.4%, Na 2 O 11.0%, MgO 2.1%, Cl 8.5%, K 2 O 3.4%, SO 3 3.1%, Fe 2 o 3 1.1%, ZnO 0.7% and some trace substances. Converted to CaO, Al 2 o 3 , SiO 2 The sum of the three phases is 100%, then the three-phase ratio of CAS is CaO 30.0%, Al 2 o 3 6.5%, SiO 2 63.4%.

[0022] (3) The pretreated sample (CaO 30.0%, Al 2 o 3 6.5%, ...

Embodiment 2

[0025] (1) Get a kind of domestic waste incineration fly ash, its main chemical composition is CaO 31.1%, Cl 26.9%, K 2 O6.5%, Na 2 O 8.2%, SO 3 9.3%, SiO 2 8.3%, MgO 2.1%, Fe 2 o 3 2.4%, ZnO 1.5%, Al 2 o 3 0.9%, TiO 2 0.5% and some trace substances, converted into CaO, Al2 o 3 , SiO 2 The sum of the three phases is 100%, then the three-phase ratio of CAS is CaO 77.2%, Al 2 o 3 2.2%, SiO 2 20.6%;

[0026] (2) Weigh 20g of incineration fly ash samples, add 22.4g of crushed glass powder, fully mix and grind to 100 mesh, the chemical composition of the sample after mixing pretreatment is SiO 2 41.5%, CaO 18.6%, Al 2 o 3 3.2%, Na 2 O 10.8%, MgO 1.9%, Cl 12.7%, K 2 O 3.1%, SO 3 4.4%, Fe 2 o 3 1.1%, ZnO 0.7% and some trace substances. Converted to CaO, Al 2 o 3 , SiO 2 The sum of the three phases is 100%, then the three-phase ratio of CAS is CaO 29.4%, Al 2 o 3 5.0%, SiO 2 65.6%;

[0027] (3) The pretreated sample (CaO 29.4%, Al 2 o 3 5.0%, S...

Embodiment 3

[0030] (1) Get a kind of domestic waste incineration fly ash, its main chemical composition is CaO 38.4%, Cl 20.2%, K 2 O8.1%, Na 2 O 7.9%, SO 3 7.3%, SiO 2 4.9%, MgO 2.6%, Fe 2 o 3 2.5%, ZnO 1.6%, Al 2 o 3 3.4%, TiO 2 1.0% and some trace substances, converted into CaO, Al 2 o 3 , SiO 2 The sum of the three phases is 100%, then the three-phase ratio of CAS is CaO 82.2%, Al 2 o 3 7.3%, SiO 2 10.5%;

[0031] (2) Take four 5mL glass bottles with a total mass of 29.9g, weigh 22.3g of incineration fly ash samples, and put them in four glass bottles respectively. The chemical composition of the samples after pretreatment in the glass bottles is SiO 2 45.4%, CaO 19.1%, Al 2 o 3 11.1%, Na 2 O 3.4%, MgO 1.1%, Cl 8.6%, K 2 O 3.5%, SO 3 3.1, Fe 2 o 3 1.0% and some trace substances. Converted to CaO, Al 2 o 3 , SiO 2 The sum of the three phases is 100%, then the three-phase ratio of CAS is CaO 25.3%, Al 2 o 3 14.7%, SiO 2 60.0%;

[0032] (3) The pret...

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Abstract

A plasma melted flying ash vitrification method based on adjustment of the ratio of CaO-Al2O3-SiO2 three phases is provided. Through pretreatment in which broken glass powder or glass bottle package is added, the mass percents of CAS three phases which are CaO, Al2O3 and SiO2 in a pretreated flying ash sample are adjusted to 8-30%, 5-17% and 60-75% respectively so that the pretreated flying ash sample is melted at 1250-1400 DEG C with the melting time being less than 25 min. The ratio of the CAS three phases in the flying ash sample is adjusted to promote formation of vitreous molten slag, pretreated flying ash can form the vitreous molten slag, and the solidification rate of each heavy metal in the pretreated molten slag is increased to a certain degree, thus controlling secondary flyingash separation and heavy metal migration, increasing the solidification rates and stability of heavy metals in the molten slag, and reducing the melting temperature and system energy consumption.

Description

technical field [0001] The invention relates to the field of hazardous waste treatment, in particular to a CaO-Al based 2 o 3 -SiO 2 Three-phase ratio-adjusted method for vitrification of plasma-fused fly ash. Background technique [0002] With the wide application of incineration technology in the field of domestic waste treatment, the output of waste incineration fly ash is increasing. It is estimated that by 2020, the annual emission will reach 10 million tons. Incineration fly ash contains high concentrations of heavy metals, salts, and carcinogens such as dioxins and furans, which belong to the category of hazardous waste and require harmless treatment. [0003] At present, the treatment methods of incineration fly ash include cement solidification, chemical agent stabilization, wet extraction, melting and solidification, etc. Cement solidification and chemical agent stabilization are the use of cement or chemical agents to wrap or chelate heavy metals, which have n...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00B09B3/40
Inventor 马文超陈冬梅陈冠益郭振飞方云豪钟磊颜蓓蓓程占军
Owner TIANJIN UNIV
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