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Method for synergistically preparing glass body from hazardous waste incineration ash residues and for decarburizing

A technology for hazardous waste and incineration of ash and slag, which is applied in the removal of solid waste, glass production, chemical instruments and methods, etc., can solve the problems of high cost of iron oxide scale, increased ash melting treatment cost, and increased treatment cost.

Active Publication Date: 2021-07-16
EVERBRIGHT ENVIRONMENTAL PROTECTION TECH RES INST SHENZHEN CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Invention patent (publication number CN 106224979 A) discloses a method for resource utilization of hazardous waste incineration bottom slag. The method is to mix SiO 2 、Al 2 o 3 Clay, fly ash, zeolite, etc. as the main components are used as auxiliary materials to form a mixture, which is melted in an electric arc furnace to obtain highly inert slag; however, the auxiliary materials used need to be purchased and shipped outside, further increasing the processing cost of bottom slag melting
Invention patent (publication number CN 108545933 A) discloses a method for preparing a glass body from incineration ash of hazardous waste. The method mixes incineration ash, silicon-containing substances, CaO and kaolin in a preset ratio, and the mixture is dried and ground and sieving, the sifted powder is heated at high temperature in a muffle furnace to prepare a glass body; but the additive SiO 2 , glass powder, CaO and kaolin are pure substances, and the addition of pure substances will further increase the cost of ash melting treatment
However, in these methods, additional iron oxide scales need to be purchased, and the cost of iron oxide scales is high; and special equipment such as oxygen guns are required, which increases the processing cost

Method used

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  • Method for synergistically preparing glass body from hazardous waste incineration ash residues and for decarburizing
  • Method for synergistically preparing glass body from hazardous waste incineration ash residues and for decarburizing
  • Method for synergistically preparing glass body from hazardous waste incineration ash residues and for decarburizing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Example 1 Class I slag mixed with fly ash

[0057] The carbon content and chemical composition of the bottom slag and fly ash of the 1# hazardous waste incineration plant were analyzed. The main components of the bottom slag are shown in Table 1 below. The carbon content in the bottom slag is 0.8%, and there is no need to add CaCO 3 As a decarburizer: according to CaO and SiO in bottom slag and fly ash 2 、Al 2 o 3 Component contents are recorded in Table 1.

[0058] Main component content / % of bottom slag and fly ash in Table 1 Example 1

[0059]

[0060] 1# bottom slag passes through the ratio Y=CaO / (SiO 2 +Al 2 o 3 ) = 0.24, belonging to Class I slag, it is necessary to add fly ash to 1# bottom slag for compounding, now take 100 parts of bottom slag and 40 parts of fly ash and mix them evenly. The purpose of matching bottom slag and fly ash is to make Y=CaO / (SiO 2 +Al 2 o 3 )=0.51, which is in the range of 0.3-0.75. The prepared mixture is put into the p...

Embodiment 2

[0062] Embodiment 2 adds decarburizing agent CaCO 3 The final type III slag is combined with the type I slag to prepare the glass body

[0063] The carbon content and chemical composition of the bottom slag of the 2# hazardous waste incineration plant were analyzed. The main components of the bottom slag are shown in Table 2: the original bottom slag is Class II slag, and the residual carbon content in the bottom slag is 6.9%, and CaCO needs to be added 3 as a decarburizer;

[0064] Main component content / % of bottom slag and fly ash in Table 2 Example 2

[0065]

[0066] When the bottom slag is 100 parts, CaCO 3 The amount of addition m=100×M1×W1 / 12=100×100×6.9% / 12=57.5 parts, add CaCO 3 The composition of the bottom slag (named: 2-1# bottom slag) is shown in Table 3.

[0067] Table 3 Main component content of 2-1# bottom slag / %

[0068]

[0069] In 2-1# bottom slag, Y=CaO / (SiO 2 +Al 2 o 3 )=1.06, belonging to Class III slag. According to the CaO and SiO in 2-1...

Embodiment 3

[0072] Embodiment 3 adds decarburizing agent CaCO 3 The final type II slag, the method for preparing glass by melting

[0073]The carbon content and chemical composition of the bottom slag of the 3# hazardous waste incineration plant were analyzed. The main components of the bottom slag are shown in Table 4: the carbon content in the bottom slag is 2.4%, and CaCO needs to be added 3 as a decarburizer.

[0074] Main component content / % of bottom slag in table 4 embodiment 3

[0075]

[0076] When the bottom slag is 100 parts, CaCO 3 The amount of addition m=100×M1×W1 / 12=100×100×2.4% / 12=20 parts, add CaCO 3 The composition of the bottom slag (named: 3-1# bottom slag) is shown in Table 5.

[0077] Table 5 Main component content of 3-1# bottom slag / %

[0078]

[0079] In 3-1# bottom slag, Y=CaO / (SiO 2 +Al 2 o 3 )=0.4, which belongs to Class II slag. Put Class II slag directly into the plasma furnace, and the temperature of the plasma furnace is raised to 1450°C. Aft...

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Abstract

The invention discloses a method for synergistically preparing a glass body from hazardous waste incineration ash residues and for decarburizing. The method comprises the following specific steps that the content of residual carbon in hazardous waste bottom slag is measured, and if the content of the residual carbon is greater than or equal to 1%, and CaCO3 is added into the bottom slag; chemical components of the hazardous waste bottom slag are detected, and the bottom slag is divided into three types according to the ratio of calcium oxide to the sum of silicon oxide and aluminum oxide in the hazardous waste bottom slag; different types of bottom slag as well as the bottom slag and fly ash are synergistically blended, and it is guaranteed that the ratio of the calcium oxide to the sum of the silicon oxide and the aluminum oxide is within 0.3-0.75; and the mixture is added into a plasma furnace for melting and heat preservation, the molten slag flows out of a slag discharging outlet, and the glass body is obtained after water quenching and cooling. Through compounding of the bottom slag, different waste materials are synergistically used for preparing the glass body, the effects of treating waste with waste and co-treating are achieved, and the treatment cost is reduced. Meanwhile, calcium carbonate is used as the decarburizing agent to remove the carbon in the bottom slag, and the residual carbon content in the glass body is reduced.

Description

technical field [0001] The invention belongs to the technical field of reuse of hazardous waste incineration bottom slag and fly ash, and in particular relates to a method for synergistically preparing glass body and decarbonization from hazardous waste incineration ash. Background technique [0002] According to the China Statistical Yearbook, in 2017 my country produced 69.3689 million tons of hazardous waste, and the disposal volume reached 25.5156 million tons, of which about 50% were incinerated, and the amount of hazardous waste incineration bottom slag generated was about 2.55 million tons. The "National Hazardous Waste List" (2016 edition) stipulates that the bottom slag produced in the process of hazardous waste incineration, pyrolysis, etc. is still hazardous waste (waste category HW18, waste code 772-003-18). For the final disposal of incineration bottom slag in my country, the method of safe landfill is mainly used. A large amount of bottom slag has caused increa...

Claims

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Application Information

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IPC IPC(8): B09B3/00C03C1/00
CPCC03C1/002B09B3/29Y02P40/50
Inventor 胡明虎训宗肖李小明齐景伟宫臣徐鹏程周飞飞张亮王婷婷赵彬肖诚斌
Owner EVERBRIGHT ENVIRONMENTAL PROTECTION TECH RES INST SHENZHEN CO LTD
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