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Heavy metal immobilization reagent for fly ash from waste incineration and preparation method thereof

A technology for waste incineration fly ash and heavy metals, applied in the direction of protection devices against harmful chemicals, etc., can solve the problem that the maximum leaching concentration cannot ensure the leaching toxicity standard of solid waste, etc., and achieve long-term stability with obvious effect, easy storage, and convenient transportation. Effect

Inactive Publication Date: 2019-05-31
中科检测技术服务(重庆)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of waste incineration fly ash heavy metal immobilization medicament and preparation method, to solve the above-mentioned background technology and propose to adopt NaOH solution as fixative, the maximum leaching concentration of Pb and Cd in the NaOH leaching solution cannot guarantee to reach solid Problems with Waste Leaching Toxicity Standards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0027] An agent for immobilizing heavy metals in waste incineration fly ash, the immobilization agent is composed of main ingredients and additives, and the main ingredients include thiourea: 10-15 parts, phosphate: 15-20 parts, Na2S: 30-50 parts, cement : 7-10 servings

[0028] The additive is composed of clay mineral and gypsum, and the content of the additive is 18 parts, wherein the content of clay mineral is 13 parts, and the content of gypsum is 5 parts.

[0029] A preparation method for immobilizing heavy metals in waste incineration fly ash, the steps are as follows:

[0030] Preparation of additives

[0031] step 1:

[0032] After grinding and drying the gypsum, pass it through a 400-mesh sieve, filter twice, and then grind the gypsum again. After grinding, mix it with clay minerals and add it to the mixer for 20 minutes. Take it out for later use. ;

[0033] Preparation of main ingredients:

[0034] Step 1: Phosphate, thiourea and Na2S were respectively thrown i...

specific Embodiment 2

[0043] An agent for immobilizing heavy metals in waste incineration fly ash, the immobilization agent is composed of main ingredients and additives, and the main ingredients include thiourea: 10-15 parts, phosphate: 15-20 parts, Na2S: 30-50 parts, cement : 7-10 servings

[0044] The additive is composed of clay minerals and gypsum, and the additive content is 18 parts, wherein the clay mineral content is 15 parts, and the gypsum content is 3 parts.

[0045] A preparation method for immobilizing heavy metals in waste incineration fly ash, the steps are as follows:

[0046] Preparation of additives

[0047] step 1:

[0048] After grinding and drying the gypsum, pass it through a 400-mesh sieve, filter twice, and then grind the gypsum again. After grinding, mix it with clay minerals and add it to the mixer for 20 minutes. Take it out for later use. ;

[0049] Preparation of main ingredients:

[0050] Step 1: Phosphate, thiourea and Na2S were respectively thrown into the stir...

specific Embodiment 3

[0059] An agent for immobilizing heavy metals in waste incineration fly ash, the immobilization agent is composed of main ingredients and additives, and the main ingredients include thiourea: 10-15 parts, phosphate: 15-20 parts, Na2S: 30-50 parts, cement : 7-10 servings

[0060] The additive is composed of clay mineral and gypsum, and the content of the additive is 21 parts, wherein the content of clay mineral is 16 parts, and the content of gypsum is 5 parts.

[0061] A preparation method for immobilizing heavy metals in waste incineration fly ash, the steps are as follows:

[0062] Preparation of additives

[0063] step 1:

[0064] After grinding and drying the gypsum, pass it through a 400-mesh sieve, filter twice, and then grind the gypsum again. After grinding, mix it with clay minerals and add it to the mixer for 20 minutes. Take it out for later use. ;

[0065] Preparation of main ingredients:

[0066] Step 1: Phosphate, thiourea and Na2S were respectively thrown i...

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Abstract

The invention discloses a heavy metal immobilization reagent for fly ash from waste incineration and a preparation method thereof. The immobilization reagent is composed of main materials and an additive. The main materials include 10-15 parts of thiourea, 15-20 parts of phosphate, 30-50 parts of Na2S, and 7-10 parts of cement. The additive is composed of clay minerals and gypsum, and the contentof the additive is 16-21 parts, wherein the content of the clay minerals is 13-16 parts and the content of the gypsum is 3-5 parts. According to the heavy metal immobilization reagent for fly ash, a solid reagent is adopted for full mixing and stored in the solid form for use, storage and transportation are facilitated, the solid reagent is easily mixed with cement, the fine cement is fully mixedwith the reagent, and thus the performance of bonding with fly ash is improved; Na2S and heavy metals react to generate insoluble metal sulfides for precipitation, the soluble heavy metals become insoluble, exposure of the heavy metals to the air is avoided, Na2S has better stability than NaOH, and the subsequent treatment process is simple.

Description

technical field [0001] The invention relates to the technical field of waste incineration fly ash, in particular to an agent for immobilizing heavy metals in waste incineration fly ash and a preparation method thereof. Background technique [0002] Domestic waste incineration fly ash is the fine particulate matter intercepted and captured by the domestic waste incineration flue gas purification system. With the continuous improvement of the purification level of waste incineration flue gas, the fly ash trapped and trapped by the purification system becomes more and more dirty. my country's domestic waste incineration has achieved rapid development and considerable progress, but fly ash treatment is far from satisfactory, and has become the weakest link in pollution control and risk management in the entire process of domestic waste incineration. In recent years, the international community has proposed the use of high-efficiency chemical stabilizers for the harmless treatme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/33A62D101/08A62D101/43
Inventor 唐毅游世文陈春霖桑柳波
Owner 中科检测技术服务(重庆)有限公司
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