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Method for preparing pyroceram by melting garbage incineration flying ash in arc furnace

A technology of waste incineration fly ash and glass-ceramics, which is applied in the field of waste incineration fly ash electric arc furnace melting to prepare glass-ceramics, which can solve the problems of not being able to use a large area, high melting temperature, and high energy consumption, and achieve the reduction of acid gas emissions, avoiding environmental damage, and reducing energy costs

Inactive Publication Date: 2012-07-04
TIANJIN URBAN CONSTR COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The actual production of glass-ceramics is mainly based on the melting method and sintering method. Among them, the melting method is the earliest researched and most widely used glass-ceramics preparation method. Its advantages are that the glass-ceramics has a compact structure, no pores, and high strength. The temperature is too high (usually at 1400-1600°C), which has the disadvantages of high energy consumption and high cost, so that this method cannot be used in a large area

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Water washing pretreatment: mixing according to the weight ratio of fly ash: water = 1:20, and then filtering and drying the fly ash to obtain washed fly ash;

[0024] (2) Preparation of mixture: using water-washed fly ash as the main raw material, adding nucleating agent TiO 2 , And mechanically mixed uniformly, the added weight of the crystal nucleating agent is 3% of the mixture;

[0025] (3) Electric arc furnace melting: Put the mixture into an electric arc furnace to melt into a molten glass, the temperature in the molten pool is 1700°C, and the melting time is 15 minutes;

[0026] (4) Casting: pouring the glass melt into a graphite mold preheated to 500°C to form a casting in the mold;

[0027] (5) Annealing: After the casting is formed, keep it at 560°C for 2h and slowly cool to room temperature;

[0028] (6) Crystallization treatment: send the annealed castings into a crystallization furnace and heat them to 900°C at a heating rate of 5°C / min to crystallize them, keep...

Embodiment 2

[0034] (1) Water washing pretreatment: mixing according to the weight ratio of fly ash: water = 1:5, the fly ash is washed with water and then filtered and dried to obtain washed fly ash;

[0035] (2) Preparation of mixture: using washed fly ash as the main raw material, adding crystal nucleating agent Cr 2 O 3 , And mechanically mixed uniformly, the added weight of the crystal nucleating agent is 2% of the mixture;

[0036] (3) Electric arc furnace melting: Put the mixture into an electric arc furnace and melt into a molten glass, the temperature in the molten pool is 1500°C, and the melting time is 90 minutes;

[0037] (4) Casting molding: pouring the glass melt into a graphite mold preheated to 550°C to form a casting in the mold;

[0038] (5) Annealing: After the casting is formed, keep it at 500℃ for 1.5h and slowly cool to room temperature;

[0039] (6) Crystallization treatment: send the annealed castings into a crystallization furnace and heat them to 800°C at a heating rate of ...

Embodiment 3

[0043] (1) Water washing pretreatment: mixing according to the weight ratio of fly ash: water = 1:12, the fly ash is washed with water and then filtered and dried to obtain washed fly ash;

[0044] (2) Preparation of mixture: using washed fly ash as the main raw material, adding crystal nucleating agent Cr 2 O 3 , And mechanically mixed uniformly, the added weight of the crystal nucleating agent is 4% of the mixture;

[0045] (3) Electric arc furnace melting: Put the mixture into an electric arc furnace to melt into a molten glass, the temperature in the molten pool is 1600°C, and the melting time is 30 minutes;

[0046] (4) Casting: pouring the glass melt into a graphite mold preheated to 600°C to form a casting in the mold;

[0047] (5) Annealing: After the casting is formed, keep it at 700°C for 2.5 hours and slowly cool to room temperature;

[0048] (6) Crystallization treatment: send the annealed castings into a crystallization furnace and heat them to 1050°C at a heating rate of 1...

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Abstract

The invention discloses a method for preparing pyroceram by melting garbage incineration flying ash in an arc furnace. The method comprises the following steps of: mixing pre-washed garbage incineration flying ash serving as a main raw material and one of nucleation agents TiO2 and Cr2O3; conveying the mixture to the arc furnace for high temperature melting treatment; directly pouring the flow-out liquid melted slag into a preheated molding die; and transferring the molded melted slag to a thermal treatment furnace for annealing and crystallization, and subsequently polishing to prepare the pyroceram. According to the method, the melted slag formed by melting the garbage incineration flying ash can be converted into recyclable available materials, additional economic benefits are supplied, and the melting treatment cost of the incineration flying ash is reduced effectively; furthermore, emission of acidic gas during melting of the flying ash can be reduced, erosion of chlorides in the flying ash to a fire resistant material of the melting furnace is eliminated, the physical sensible heat of the melted slag in the arc furnace is used effectively, and the energy consumption in the preparation process is reduced.

Description

Technical field [0001] The invention relates to a method for treating and reusing solid waste, in particular to a method for preparing glass-ceramics by melting fly ash from garbage incineration in an electric arc furnace. Background technique [0002] As the landfill site of domestic waste is becoming more and more restricted, incineration has become one of the main development directions of waste treatment in my country. However, after incineration of waste will produce about 3% to 5% of fly ash, which contains considerable amounts of fly ash. A large amount of toxic substances such as heavy metals and dioxins that are easy to leach. Heavy metals and dioxins cannot be chemically decomposed or biodegraded, and they have a strong bioaccumulation effect. Once they enter the environment, they will seriously endanger human survival and health. How to safely and effectively dispose of waste incineration fly ash and realize the recycling of resources has become an urgent problem to be...

Claims

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Application Information

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IPC IPC(8): C03C6/08
Inventor 刘汉桥魏国侠
Owner TIANJIN URBAN CONSTR COLLEGE
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