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Additive for fusing fly ash in use for refuse burning process

A waste incineration and additive technology, applied in the direction of solid waste removal, etc., can solve the problems of high operating cost of fly ash melting treatment, hindering the application and promotion of melting and solidification technology, and large energy, so as to be beneficial to resource utilization, Increase the curing effect and enhance the physical properties

Inactive Publication Date: 2006-07-05
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] On the other hand, the operating temperature for the melting and solidification of waste incineration fly ash is around 1500°C. Such a high temperature consumes a lot of energy, making the operating cost of fly ash melting treatment high, which hinders the further application and promotion of melting and solidification technology.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Fly Ash Fusion Additive Composition: 50% B 2 o 3 , 25% SiO 2 , 7% CaF 2 Grind with 18% MgO into 106 mesh and mix well.

[0009] Mix 2g of the additive in this example with 50g of raw ash evenly and then perform melting treatment, which can reduce the melting flow temperature of fly ash to 1100°C, shorten the melting treatment time to 0.5 hours, and have a low volatilization rate, which is formed after water quenching and cooling The heavy metal leachability of molten slag is much lower than the standard level of hazardous waste identification.

Embodiment 2

[0011] Fly Ash Melt Additive Composition: 42% B 2 o 3 , 40% SiO 2 , 7% CaF 2 , 7% MgO and 4% ZrO 2 Grind into 150 mesh and mix well.

[0012] After the additive 2g of this example is mixed with 60g raw ash evenly, melt processing is carried out. The flow temperature of the fly ash can be reduced to 1070°C, the melting time is 1 hour, the volatilization rate is low, and the heavy metal leachability of the molten slag formed after water quenching is far lower than the hazardous waste identification standard level.

Embodiment 3

[0014] Fly Ash Fusion Additive Composition: 30% B 2 o 3 , 28% SiO 2 , 20% CaF 2 , 20% MgO and 2% ZrO 2 Mix and grind to 256 mesh.

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PUM

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Abstract

The present invention relates to a flyash melt additive for refuse incineration treatment. It is made up by using (by wt%) 30-50% of B2O3, 25-40% of SiO2, 7-20% of CaF2 and 7-20% of MgO, and mixing them and grinding them to 106-256 meshes. In the above-mentioned mixture 2-5% of ZrO2 also can be added. The addition of proper quantity of the invented flyash melt additive in refuse flyash can effectively reduce melting temperature, reduce volatilization of inorganic salts, at the same time raise solidification effect of heavy metal in glass body and raise various physical properties of molten slag.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, and in particular relates to the improvement of melting additives in the melting and solidification technology. Background technique [0002] Melting solidification technology is a relatively advanced harmless treatment method for waste incineration fly ash at home and abroad. Fly ash melting and solidification treatment can completely eliminate dioxins in fly ash, ensure the long-term stability of solidified heavy metals, and greatly reduce the volume of fly ash ; At the same time, the molten slag can be used as civil engineering, construction and other materials, which can effectively realize the utilization of waste resources. Therefore, melt solidification technology has become one of the hot spots in the field of solid waste research. [0003] On the other hand, the operating temperature of waste incineration fly ash melting and solidification is about 1500°C. Such a high temp...

Claims

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Application Information

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IPC IPC(8): B09B3/00
Inventor 席北斗王琪姜永海张晓萱
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI