Method for waste incineration ash and slag co-melting

A waste incineration ash, waste incineration technology, applied in chemical instruments and methods, solid waste removal, transportation and packaging, etc., can solve the problems of heavy metal leakage and high heavy metal content

Inactive Publication Date: 2020-09-22
SHANGHAI ENVIRONMENTAL & SANITARY ENG DESIGN INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the content of heavy metals in the slag is high, and the problem of heavy metal leakage will occur under long-term weak acid and humid conditions

Method used

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  • Method for waste incineration ash and slag co-melting
  • Method for waste incineration ash and slag co-melting
  • Method for waste incineration ash and slag co-melting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The fly ash and slag were compounded and melted at different temperatures to observe the state of the molten product. The mass ratios of fly ash and slag were 1:0, 1:1, 1:2, 2:1, 0:1, the compounded ash-slag mixture at each ratio was co-melted at 1250°C, 1300°C, 1350°C, 1400°C, and 1450°C, and the co-melting time was 4 hours. The observations on the product are as follows figure 2 shown.

[0033] according to figure 2 It can be seen that when the mass ratio of fly ash to slag is 1:1, vitreous slag can be obtained at 1400 °C; when the mass ratio of fly ash to slag is 2:1, vitreous slag can be obtained at 1500 °C.

[0034] When the mass ratio of fly ash to slag is 1:2, the color of the molten product is brown, the surface is smooth, and the vitrification is obvious, indicating that adding slag to the fly ash is beneficial to reduce the melting temperature, reduce the volatilization of salts and heavy metals in the fly ash, and achieve solidification of heavy metals. ...

Embodiment 2

[0036] Compound fly ash, slag and boric acid, and co-melt the mixture, wherein the mass ratio of fly ash and slag is 1:0, 1:1, 1:2, 2:1, 0:1, each ratio The amount of boric acid added is respectively 2.5%, 5%, 7.5%, and 10% of the total mass of fly ash, slag, and boric acid. The melting point of compound is tested, and the obtained results are shown in table 2:

[0037] Table 2 The melting point of the compound under different boric acid addition ratios and ash-slag ratios (°C)

[0038]

[0039]

[0040]As can be seen from Table 2, the addition of boric acid can reduce the melting point of the compound within the range of 2.5 to 10%, and the effect is the best when the addition of boric acid is 5%. Continue to increase the amount of boric acid, and the rate of decline of the melting point is not Large, controlling the addition of boric acid to 2.5-5%, can reduce the melting point of the compound on the premise of ensuring the cost.

Embodiment 3

[0042] The mass ratio of fly ash and slag was controlled to be 1:2, and co-melting was carried out at different temperatures and boric acid contents, and the co-melting time was 4 hours. The XRD test was carried out on the product to detect the vitrification effect of the molten product. Among them, it is divided into seven experimental groups from 6# to 12#, and the experimental conditions are shown in Table 3;

[0043] Table 3 Experimental conditions of experimental groups 6#~12#

[0044] serial number Co-melting temperature / ℃ Addition amount of boric acid / % 6# 1300 0 7# 1350 0 8# 1400 0 9# 1250 0 10# 1250 2.5 11# 1400 2.5 12# 1400 0

[0045] The XRD test result of molten product is as image 3 shown. according to image 3 It can be seen that under the conditions shown in Table 3 (the co-melting temperature is 1250~1400°C, and the amount of boric acid added is 0 or 2.5%), in the XRD spectrum of the resulting mol...

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Abstract

The invention relates to the technical field of waste residue treatment, and provides a method for waste incineration ash and slag co-melting. The method comprises the following steps that fly ash andfurnace slag generated by waste incineration are mixed for co-melting to obtain vitreous slag; the mass ratio of the fly ash to the furnace slag is 1: 2-2: 1; and the co-melting temperature ranges from 1200 DEG C to 1500 DEG C. According to the method, the furnace slag generated by the waste incineration is a silicon source to be co-melted with the fly ash, "waste is prepared from waste" is achieved while vitrification of the fly ash is ensured, and meanwhile, a thought is provided for standardized development of a furnace slag disposal mode; by adjusting the ratio of the furnace slag to thefly ash, the melting point of the fly ash is reduced, and the effective vitrification is achieved, so that leaching of heavy metal in the vitreous slag reaches the standard; and the result of the embodiment shows that the method is used for co-melting, vitrification can be carried out at a low temperature, and the leaching toxicity of the heavy metal of the vitreous slag can meet the requirementsin HJ / T 300-2007.

Description

technical field [0001] The invention relates to the technical field of waste slag treatment, in particular to a method for co-melting waste incineration ash. Background technique [0002] Domestic waste will produce about 1-3% fly ash and 20-23% slag after being incinerated by grate furnace. Among them, fly ash belongs to hazardous waste. The conventional fly ash treatment method is "chelation pretreatment + landfill in different areas". The corresponding management regulations of this method are relatively mature, but there are still hidden dangers of rapid land consumption and pollution leakage. The high-temperature melting process can make fly ash form a stable glass body by melting, and solidify heavy metal substances in the glass body. It is considered to be a harmless and resource-efficient fly ash disposal technology. Due to the low content of inorganic inert substances such as Si and Al, raw ashes incinerated by grate furnaces cannot form stable aluminosilicate eute...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
CPCB09B2101/30B09B3/40
Inventor 夏旻陈善平邰俊宋立杰贾川毕朱洁余召辉袁国安
Owner SHANGHAI ENVIRONMENTAL & SANITARY ENG DESIGN INST CO LTD
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