A method for detoxification and graded resource utilization of domestic waste incineration fly ash

A domestic waste incineration and recycling technology, which is applied in the direction of improving process efficiency and removing solid waste, can solve problems such as high cost, difficult recycling of useful resources, and poor harmless effect of fly ash, so as to improve efficiency, Solve the problem of seriously exceeding the standard and waste of useful resources, and the effect is remarkable

Active Publication Date: 2018-06-26
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 prior art to deal with fly ash of domestic waste incineration, and to provide a detoxification and classification of fly ash of domestic waste incineration Resource Utilization Method

Method used

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  • A method for detoxification and graded resource utilization of domestic waste incineration fly ash
  • A method for detoxification and graded resource utilization of domestic waste incineration fly ash

Examples

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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 element in the original fly ash is as high as 87%.

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

Embodiment 2

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

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

[0050] The washing solution from the fly ash washed with the pickling solution after the pickling of the fly ash is directly mixed, and left to settle for 1-3 hours, and the supernatant is enriched and purified with activated carbon with selective adsorption function for heavy metals (zinc, lead, copper, etc.) etc.), the activated carbon after enrichment and purification of heavy metals can be used to recover heavy metals, specifically: firstly, the heavy metals adsorbed by activated carbon are dissolved by pickling, and then separated from the solution (such as reduction precipitation method, solvent extraction method, etc.) and refining, Finally, pure heavy metal products are obtained. The recovery rate of heavy metals is as high as 80%. Activated carbon after enrichment and purification of hea...

Embodiment 3

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

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

[0054] In this embodiment, soluble salts are precipitated through solution evaporation and concentration. The evaporation concentration temperature is 80-100° C., and the recoverable soluble salts are mainly sodium salts, magnesium salts and calcium oxides, etc., and 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) because of its high concentration of he...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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