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Waste acid cooperative disposal process in domestic waste incineration fly ash resource refining process

A domestic waste incineration and co-processing technology, which is applied in special compound water treatment, neutralized water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problems of backward waste acid treatment technology, waste acid recovery and utilization, and high treatment cost problems, to achieve the effect of dual resource utilization, saving water and cost, and reducing the amount of water added

Active Publication Date: 2019-01-18
韩正昌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the backward treatment technology and high cost of waste acid, most enterprises do not process, recycle and utilize these waste acids, but simply discharge them directly, which not only wastes resources, but also poses a great threat to the environment

Method used

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  • Waste acid cooperative disposal process in domestic waste incineration fly ash resource refining process
  • Waste acid cooperative disposal process in domestic waste incineration fly ash resource refining process
  • Waste acid cooperative disposal process in domestic waste incineration fly ash resource refining process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Add acid solution, water, solubilizer, flocculant and reducing agent to fly ash for dissolution and stirring, then add oxidant for secondary stirring, and finally separate solid and liquid. Calculated by mass when dissolving, add 1 part of fly ash to 2-3 parts of acid solution, and add 1-2 parts of water at the same time, the mass fraction of the acid solution is 10-20%; the stirring time for two times is 0.5h-2h; The acid used is industrial waste acids such as hydrochloric acid, nitric acid, sulfuric acid, etc., and the pH value of the acid solution is 0.5-2; the solubilizer is a kind of substance that is insoluble in water and easily soluble in dioxins, preferably dimethyl phosphate and dimethyl carbonate Any one of ester, dimethyl sulfate, and acetone, the addition amount is 1%-3% of the whole solution mass; the flocculant is aluminum chloride, the dosage is 0.5%-1.5% of the whole solution mass, and the reducing agent includes but not limited to For reducing subs...

Embodiment 2

[0049] The fly ash in the experiment comes from a thermal power company in Shanghai. It is a typical fly ash produced by household waste incineration. It contains a lot of dioxins, heavy metals and salts, which is very harmful to the environment and human body. The waste acid comes from waste hydrochloric acid produced by a chemical plant, with a mass fraction of about 15%. The present invention can use waste acid to dissolve fly ash, and then remove heavy metals, dioxins and salts in fly ash through different processes, as shown in Table 1-1. And isolate the sodium chloride salt shown in Table 1-2 and the potassium chloride salt shown in Table 1-3.

[0050] Table 1-1 Experimental steps and experimental results

[0051]

[0052]

[0053] It can be seen from Table 1-1 that after dissolving the original fly ash, adjusting the pH value, adding a reducing agent, stirring for 1.5 hours, adding an oxidizing agent and continuing to stir for 1 hour, the dioxin-like toxic equiva...

Embodiment 3

[0061] The fly ash in the experiment comes from a waste incineration plant in Jiangsu, which is a typical fly ash produced by the incineration of domestic waste. The content of dioxin, heavy metal and salt is very high, which is very harmful to the surrounding environment and human body. The waste acid comes from the waste sulfuric acid produced by a smelter dye factory, with a concentration of about 16%. The present invention can utilize waste acid to dissolve fly ash, and then remove heavy metals, dioxins and salts in fly ash through different processes, as shown in Table 2-1, and separate sodium chloride salt shown in Table 2-2 and chloride Potassium salts are shown in Table 2-3.

[0062] Table 2-1 Experimental steps and experimental results

[0063]

[0064]

[0065]

[0066] It can be seen from Table 2-1 that after dissolving the original fly ash, adjusting the pH value, adding a reducing agent, stirring for 1.8 hours, adding an oxidizing agent and continuing st...

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Abstract

The invention belongs to the technical field of dangerous solid waste disposal and resource utilization, and particularly relates to a waste acid cooperative disposal process in the domestic waste incineration fly ash resource refining process. In the process disclosed by the invention, fly ash is dissolved with a great amount of waste acid, leaching is repeatedly carried out, dioxin, heavy metalsand salt in the fly ash can be dissolved in filtrate, then by carrying out treatment on the filtrate, content of the dioxin, the heavy metals and the salt in the filtrate is reduced and meanwhile, sodium chloride salt and potassium chloride salt are separated out, thereby implementing resource comprehensive utilization of the waste acid and the fly ash.

Description

technical field [0001] The invention belongs to the technical field of hazardous solid waste treatment and resource utilization, and in particular relates to a waste acid co-processing process in the process of domestic waste incineration fly ash resource refinement. Background technique [0002] With the rapid development of large cities and the energy crisis, incineration technology has been adopted more and more, but its product incineration fly ash is hazardous waste (HW18), which contains a large amount of dioxin and heavy metals, and this type of pollution Factors will have a very significant impact on the urban environment and people's health. [0003] At present, at home and abroad, the main methods for removing dioxins in fly ash are: heat treatment, catalytic decomposition and dechlorination, hygrothermal decomposition, chemical treatment, biological treatment, etc. Heat treatment is carried out at high temperature for a long time, which has the disadvantages of h...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00C02F9/10
CPCB09B3/00B09B5/00C02F1/04C02F1/52C02F1/66C02F1/70C02F1/722C02F1/725C02F1/78C02F9/00C02F2301/08C02F2305/026
Inventor 韩正昌马军军陶志慧胡苏杭章婕季军卜旭凌叶波
Owner 韩正昌
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