Method for recovering calcium salt by treating high Cl high CO2 burning flue gas and waste burning fly ash water washing lotion

A technology of waste incineration fly ash and incineration flue gas, applied in separation methods, chemical instruments and methods, water/sewage multi-stage treatment, etc., to achieve the effects of saving water, reducing environmental pollution, and reducing emissions

Inactive Publication Date: 2014-11-05
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] So far, there is no relevant technical report on the use of high-chlorine and high-carbon dioxide incineration flue gas to co-process waste incineration fly ash washing liquid and recover calcium salt by-products

Method used

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  • Method for recovering calcium salt by treating high Cl high CO2 burning flue gas and waste burning fly ash water washing lotion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1 (the water-cement ratio is 3:1, and the flue gas is fed to pH=8.5)

[0019] The implementation process is shown in the attached figure. The scale of the experiment is to process 1 ton of fly ash per day, and the water-cement ratio is 3:1. The concentration of Pb in the wastewater generated during pretreatment is 36.72mg / L, the concentration of Cr is 1.37mg / L, the concentration of Cd is 0.35mg / L, the concentration of Cu is 0.82mg / L, the concentration of Zn is 2.04mg / L, and the concentration of Ni 0.57mg / L, both exceeding GB18918-2002 "Pollutant Discharge Standards for Urban Sewage Treatment Plants". The concentration of hydrogen chloride in the flue gas of medical waste incineration is 350 mg / L, which is much higher than GB18484-2001 "Pollution Control Standards for Hazardous Waste Incineration". The method of the present invention is used to fully react the two, and after the pH of the washing solution is reduced to 8.5, the concentration of hydrogen chloride...

Embodiment 2

[0021] Example 2 (the water-cement ratio is 3:1, and the flue gas is fed to pH=7.5)

[0022] The implementation process is shown in the attached figure. The scale of the experiment is to process 1 ton of fly ash per day, and the water-cement ratio is 3:1. The concentration of Pb in the wastewater generated during pretreatment is 36.72mg / L, the concentration of Cr is 1.37mg / L, the concentration of Cd is 0.35mg / L, the concentration of Cu is 0.82mg / L, the concentration of Zn is 2.04mg / L, and the concentration of Ni 0.57mg / L, both exceeding GB18918-2002 "Pollutant Discharge Standards for Urban Sewage Treatment Plants". The concentration of hydrogen chloride in the flue gas of medical waste incineration is 350 mg / L, which is much higher than GB18484-2001 "Pollution Control Standards for Hazardous Waste Incineration". The method of the present invention is used to fully react the two, and after the pH of the washing liquid is reduced to 7.5, the concentration of hydrogen chloride i...

Embodiment 3

[0024] Example 3 (the water-cement ratio is 8:1, and the flue gas is fed to pH=8.5)

[0025] The implementation process is shown in the attached figure. The scale of the experiment is to process 1t of fly ash per day, and the water-cement ratio is 8:1. The concentration of Pb in the wastewater generated during pretreatment is 26.60mg / L, the concentration of Cr is 1.03mg / L, the concentration of Cd is 0.31mg / L, the concentration of Cu is 0.59mg / L, the concentration of Zn is 1.07mg / L, and the concentration of Ni 0.51mg / L, both exceeding GB18918-2002 "Pollutant Discharge Standards for Urban Sewage Treatment Plants". The concentration of hydrogen chloride in the flue gas of medical waste incineration is 350 mg / L, which is much higher than GB18484-2001 "Pollution Control Standards for Hazardous Waste Incineration". Using the method of the present invention to make the two fully react, after the pH of the washing liquid is reduced to 8.5, the concentration of hydrogen chloride is re...

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Abstract

The invention discloses a method for recovering calcium salt by treating high Cl high CO2 burning flue gas and waste burning fly ash water washing lotion, which comprises the following steps: 1) flue gas and the water washing lotion are co-operated; 2)multiple-effect evaporation is carried out for recovering calcium salt. In the step 1) burning flue gas is introduced in a fly ash water washing lotion until pH value of the water washing lotion is reduced to 6-9; acidic gas such as hydrogen chloride in the flue gas is absorbed and neutralized by high alkalescence water washing lotion, calcium-heavy metal-chloride ion double salt is formed; carbon dioxide is slightly dissolved in water to form the calcium-heavy metal-carbonate ion double salt, and then the calcium-heavy metal-carbonate ion double salt is fixed; wherein pH of the water washing lotion is reduced to 6-9 from 11-13 which exceeds a national discharge standard; concentration of heavy metal ions such as zinc, copper, chromium and cadmium in the water washing lotion is reduced, and the heavy metal ions are conversed to calcium-heavy metal double salt sediment. In the step 2), a lot of residual calcium salt resource in the water washing lotion is recovered through multiple-effect evaporation. The invention realizes the harmlessness and resource treatment for two wastes of high chlorine high carbon dioxide burning flue gas and garbage burning fly ash water washing lotion.

Description

technical field [0001] The present invention relates to a kind of using high Cl high CO 2 The invention relates to a method for treating waste incineration fly ash washing liquid and recovering calcium salt by-products by incinerating tail gas, which is a method for realizing harmless and resourceful hazardous waste, and belongs to the technical field of environmental engineering and waste liquid recovery and utilization. Background technique [0002] At present, high temperature incineration has been widely used in the field of domestic waste and medical waste treatment. However, the incineration flue gas usually contains a large amount of acid gas hydrogen chloride, carbon dioxide, smoke and other pollutants. If no effective measures are taken to remove these pollutants in the flue gas, acid rain and the greenhouse effect will be aggravated. [0003] In addition, in the waste incineration fly ash cement kiln co-disposal technology, the washing liquid produced during the w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/68B01D53/62B01D53/96C02F9/10C01F11/24
Inventor 钱光人张晓樵周吉峙潘赟张灵恩傅沪鸣
Owner SHANGHAI UNIV
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