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Incineration fly ash bi-component heavy metal stabilizer and fly ash treatment method applying same

A heavy metal stabilizer and fly ash incineration technology, which is applied to chemical instruments and methods, solid waste removal, transportation and packaging, etc., can solve the problems of high price, environmental pollution, high processing cost, etc., to improve stabilization efficiency and reduce The cost of use, the effect of good stabilization effect

Inactive Publication Date: 2016-04-20
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The stabilization of heavy metals by chemical agents is the most effective method for fly ash treatment, but the commonly used inorganic agents such as lime, ferrous sulfate, vitriol, phosphate, sulfide, etc. are not only used in large amounts, but also difficult to meet the leaching toxicity requirements; although organic chelating agents The stabilization effect on heavy metals has been significantly improved, but there are also disadvantages of high prices and high processing costs
In addition, the existing chemical agent stabilization method has the disadvantage that the long-lasting stability of the solidified body formed by the agent and heavy metals is not good enough, and it may decompose again and re-leach to cause environmental pollution

Method used

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  • Incineration fly ash bi-component heavy metal stabilizer and fly ash treatment method applying same

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Effect test

Embodiment 1

[0027] In the incineration fly ash two-component heavy metal stabilizer of the present embodiment, the A component includes 0.1 part of activator, and the B component is 2 parts of phosphate, 3 parts of organic sulfur and 1 part of inorganic sulfur; adopt this stabilizer to incinerate fly ash Heavy metal stabilization treatment, including the following steps:

[0028] Mix the fly ash with the aqueous solution of component A to activate the reaction for 20 minutes, then add the aqueous solution of component B, mix and stir for 0.5 hours, and finally cure at room temperature for 24 hours. The concentration of the aqueous solution of component A is 10% ， And the amount of component A is 0.01% of the weight of fly ash; the concentration of the aqueous solution of component B is 30%, and the amount of component B is 2.1% of the weight of fly ash.

[0029] In this embodiment, the activator is sodium dodecylbenzenesulfonate. In this embodiment, sodium dodecylbenzenesulfonate is repla...

Embodiment 2

[0034] In the incineration fly ash two-component heavy metal stabilizer of the present embodiment, the A component includes 0.1 part of activator, and the B component is 2 parts of phosphate, 2 parts of organic sulfur and 3 parts of inorganic sulfur; Gray heavy metal stabilization treatment, including the following steps:

[0035] Mix the fly ash and the aqueous solution of component A to activate the reaction for 20 minutes, then add the aqueous solution of component B, mix and stir for 0.5 hours, and finally cure at room temperature for 24 hours; the concentration of the aqueous solution of component A is 30% and the concentration of component A The dosage is 1% of the weight of the fly ash; the concentration of the aqueous solution of the B component is 50% and the dosage of the B component is 25% of the weight of the fly ash.

[0036] In this embodiment, the activator is sodium dodecylbenzenesulfonate. In this embodiment, sodium dodecylbenzenesulfonate is replaced by hexad...

Embodiment 3

[0041] The incineration fly ash two-component heavy metal stabilizer of the present embodiment, A component comprises 0.01 part of activator, B component comprises 1 part of phosphate, 0.1 part of organic sulfur and 1 part of inorganic sulfur; Adopt this stabilizer to incinerate fly ash Heavy metal stabilization treatment, including the following steps:

[0042] Mix the fly ash with the aqueous solution of component A to activate the reaction for 0.1 hour, then add the aqueous solution of component B, mix and stir for 0.1 hour, and finally cure at room temperature for 48 hours; the aqueous solution concentration of component A is 20% and component A The dosage is 0.05% of the weight of the fly ash; the concentration of the aqueous solution of the B component is 40% and the dosage of the B component is 10% of the weight of the fly ash.

[0043] In this embodiment, the activator is cetyltrimethylammonium chloride. In this embodiment, cetyltrimethylammonium chloride is replaced b...

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Abstract

The invention discloses an incineration fly ash bi-component heavy metal stabilizer and a fly ash treatment method applying the same. The stabilizer comprises an A component and a B component; the A component comprises an activator which is used for activating alkaline substance and heavy metal in fly ash; the activator is a water-soluble ionic surfactant or / and nonionic surfactant; the B component comprises phosphate, organic sulfur and inorganic sulfur; the reactivity of the fly ash is improved by the activator, and the composite organic-inorganic agent is used for stabilizing the heavy metal in the fly ash high-efficiently, so that the using cost is lowered, and the heavy metal stabilization efficiency is also improved; the phosphate stabilizes the heavy metal in an assistant manner, and heavy metal leaching caused by oxygenolysis of chelate formed by the organic sulfur stabilizer and heavy metal is prevented, so that the stability of the chelate formed by the heavy metal and the chemical agent is improved; and under the cooperative effect of the activator and the composite chemical agent, a very good stabilization effect for the heavy metal in the fly ash, especially Pb, Cd and the like is realized, and the stabilization efficiency is up to more than 98%.

Description

technical field [0001] The invention relates to the field of solid waste treatment, in particular to a fly ash heavy metal stabilizer and a fly ash treatment method thereof. Background technique [0002] During the incineration of domestic waste for power generation, a large amount of fly ash containing heavy metals is produced. Fly ash is a kind of hazardous waste. According to the "Life Waste Landfill Pollution Control Standard" (GB16889-2008), it can be sent to landfill for separate landfill treatment only after strict treatment reaches the concentration limit. The solid waste leaching toxicity method-acetic acid buffer solution method (HJ / T300-2007) adopted in the "Standards for Pollution Control of Domestic Garbage Landfill" is different from the most commonly used domestic "Standards for Hazardous Waste Identification-Leaching Toxicity Identification" (GB5086.2- 1997), the leaching conditions are harsh. In addition, since the fly ash enters the domestic waste landfil...

Claims

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Application Information

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IPC IPC(8): A62D3/33B09B3/00A62D101/08A62D101/43
CPCA62D3/33A62D2101/43A62D2101/08B09B3/25B09B2101/30
Inventor 秦瑞香王金波
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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