Detoxification graded resource utilization method for household garbage incineration fly ash

A technology for incineration and recycling of domestic waste, applied in the improvement of process efficiency, removal of solid waste, etc., can solve the problems of high cost, difficult recycling of useful resources, poor harmless effect of fly ash, etc. Solve the serious excess of heavy metals and waste of useful resources, the effect is remarkable

Active Publication Date: 2017-01-04
中陕核生态环境有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The problem to be solved by the present invention is to overcome the problems of poor harmless effect of fly ash, high cost, and difficult recycling of useful resources in the

Method used

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  • Detoxification graded resource utilization method for household garbage incineration fly ash
  • Detoxification graded resource utilization method for household garbage incineration fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: Preparation of permeable bricks after detoxification of fly ash

[0038] A method for detoxification and graded resource utilization of domestic waste incineration fly ash, such as figure 1 shown, including the following steps:

[0039] (1) Mix domestic waste incineration fly ash and water at a mass volume ratio of 1:10g / ml, and mix with mechanical stirring for 1 hour to ensure that soluble salts and chlorine are fully dissolved to form a mortar. After washing with water, the mass of soluble salt dissolved in water accounts for about 29% of the weight of the original fly ash, and the removal rate of chlorine in the original fly ash is as high as 87%;

[0040] (2) Send the mortar obtained in step (1) into a centrifuge for dehydration, and separate the washing solution and the washed fly ash, wherein the washed fly ash and 1.5 mol / L nitric acid preparation solution are prepared according to the mass volume ratio of 1: Mix at a ratio of 10g / ml, pickle and remo...

Embodiment 2

[0048] Example 2: Recovery of precious metals in fly ash

[0049] This embodiment is the recovery of precious metals in the washing solution and pickling solution obtained in Example 1.

[0050] The washing liquid from the fly ash washed with the pickling liquid after the pickling of the fly ash is mixed directly, and left to settle for 1-3 hours. etc.), the activated carbon after enrichment and purification of precious metals can be used to recover precious metals, specifically: firstly, pickling is used to dissolve the precious metals adsorbed by activated carbon, and then separated from the solution (such as reduction precipitation method, solvent extraction method, etc.) and refining, Finally, pure products of precious metals are obtained. The recovery rate of precious metals is as high as 80%. Activated carbon after enrichment and purification of precious metals After recovery of precious metals, the activated carbon is activated at 600°C-1000°C under different atmosphe...

Embodiment 3

[0052] Example 3: Recovery of soluble salts in fly ash

[0053] This example is for the recovery of soluble salts in the remaining liquid phase after enrichment and purification of precious metals using activated carbon with selective adsorption function in Example 1.

[0054] In this embodiment, soluble salts are precipitated by evaporation and concentration of the solution. The evaporation concentration temperature is 80-100 ° C. The recoverable soluble salts are mainly sodium salts, magnesium salts and calcium oxides, etc. The recovery rate of soluble salts is as high as 90%. This achieves the purpose of recovering soluble salts in water samples. After the evaporated water is condensed, it can be recycled for washing the fly ash, and a certain volume of tap water is added again according to the mixing ratio of the fly ash and water during the washing process.

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Abstract

The invention relates to a detoxification graded resource utilization method for household garbage incineration fly ash. The method includes the steps that the household garbage incineration fly ash is subjected to desalination and dechlorination through washing, and then subjected to heavy metal removal through acid pickling, and obtained detoxified fly ash and household garbage incineration bottom ash are compounded to prepare water permeable bricks; and a washing solution and an acid pickling solution are mixed, precious metal is enriched and purified selectively through activated carbon, and after soluble salt recovery is conducted on the residual liquid phase, obtained water treating fluid is reused in the washing step. By means of the detoxification graded resource utilization method, soluble salt, the chlorine element and the precious metal in the fly ash can be effectively removed, and the leaching toxicity of residual heavy metal in the fly ash completely meets the national standard; and meanwhile, the precious metal and the soluble salt in the fly ash are effectively recovered, and cyclic utilization of waste liquid and activated carbon is guaranteed. The method has the advantages that energy is saved, the method is ecological and environmentally friendly, resources are recycled, and waste is turned into wealth; and meanwhile, the detoxified fly ash can be safely applied to the industries including construction, environmental protection and the like, and the application and popularization value is quite high.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a method for detoxification and graded resource utilization of domestic waste incineration fly ash. Background technique [0002] Domestic waste incineration technology can realize waste volume reduction, volume reduction and energy utilization, and also has the advantages of small footprint, short processing time and can completely kill all pathogenic microorganisms and parasite eggs, so incineration technology has been used in It has been developed rapidly and widely used in our country. The domestic waste incineration fly ash is a secondary pollutant produced in the waste incineration process, and the output is about 3%-5% of the total. In 2015, the national domestic waste incineration fly ash produced more than 8 million tons per year. Fly ash has been included in the "National Hazardous Waste List" (HW18) due to its high concentration of heavy ...

Claims

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Application Information

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IPC IPC(8): C22B7/02B09B3/00B09B5/00
CPCB09B3/00B09B5/00C22B7/007C22B7/02Y02P10/20
Inventor 王兴栋汪印
Owner 中陕核生态环境有限公司
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