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Garbage fly ash recycling treatment process

A technology of waste fly ash and treatment process, applied in water/sewage treatment, heating water/sewage treatment, neutralized water/sewage treatment, etc. products, the effect of improving utilization

Inactive Publication Date: 2019-01-04
丁仲军 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the current garbage fly ash treatment process, the garbage fly ash is firstly washed with water, and then sodium carbonate is used to remove calcium ions in the water washing process, but the price of sodium carbonate is relatively high. If sodium sulfate with a lower price is used to remove calcium ions, which will cause subsequent clogging of the ultrafiltration membrane
Moreover, the current treatment of garbage fly ash washing wastewater has not maximized resource recovery and utilization. Therefore, it is necessary to start from all directions to reduce the cost of garbage fly ash treatment on the basis of maximizing resource recovery and utilization.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A waste fly ash resource utilization treatment process, the steps are as follows:

[0043] S1 water elution chlorine, the waste fly ash is removed chlorine element in the fly ash by the water elution chlorine process, and the water washing process obtains chlorine-containing washing wastewater; the water washing process is three-stage countercurrent washing; details are as follows:

[0044] The specific steps of the washing process are as follows:

[0045] Step 1. The fly ash storage tank 1 transports the fly ash to the primary cleaning tank 201 and mixes it with the water in the first storage tank 301. The ratio of fly ash to water is 1:1; aerate and stir for 10 minutes, and then use the first stage The filter press 411 and / or the second stage filter press 412 perform press filtration, the filtrate enters the reaction storage tank 304, and the fly ash sludge enters the second sludge pulverizer 501; the ammonia absorption tower 6 uses water as an absorbent to absorb amm...

Embodiment 2

[0062] A waste fly ash resource utilization treatment process, the steps are as follows:

[0063] S1 water elution chlorine, the waste fly ash is removed chlorine element in the fly ash by the water elution chlorine process, and the water washing process obtains chlorine-containing washing wastewater; the water washing process is three-stage countercurrent washing; details are as follows:

[0064] The specific steps of the washing process are as follows:

[0065] Step 1. The fly ash storage tank 1 transports the fly ash to the primary cleaning tank 201, and mixes it with the water in the first storage tank 301. The ratio of fly ash to water is 1:2; aerate and stir for 20 minutes, and then use the first stage The filter press 411 and / or the second stage filter press 412 perform press filtration, the filtrate enters the reaction storage tank 304, and the fly ash sludge enters the second sludge pulverizer 501; the ammonia absorption tower 6 uses water as an absorbent to absorb am...

Embodiment 3

[0082] A waste fly ash resource utilization treatment process, the steps are as follows:

[0083] S1 water elution chlorine, the waste fly ash is removed chlorine element in the fly ash by the water elution chlorine process, and the water washing process obtains chlorine-containing washing wastewater; the water washing process is three-stage countercurrent washing; details are as follows:

[0084] The specific steps of the washing process are as follows:

[0085] Step 1. The fly ash storage tank 1 transports the fly ash to the primary cleaning tank 201 and mixes it with the water in the first storage tank 301. The ratio of fly ash to water is 1:1.5; aerate and stir for 30 minutes, and then use the first stage The filter press 411 and / or the second stage filter press 412 perform press filtration, the filtrate enters the reaction storage tank 304, and the fly ash sludge enters the second sludge pulverizer 501; the ammonia absorption tower 6 uses water as an absorbent to absorb a...

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Abstract

The invention relates to the technical field of garbage fly ash treatment, in particular to a garbage fly ash recycling treatment process. The process comprises the following steps: (1) washing garbage fly ash with water to remove chloride; (2) removing heavy metals: removing the heavy metals from washing wastewater, specifically comprising: adding excessive sodium sulfide into the washing wastewater, then adding ferrous sulfide, and removing sediments; (3) detecting the content of calcium ions in the water, adding sodium sulfate into the wastewater according to the calcium ions, and removingthe sediments; (4) adding sodium carbonate into the wastewater, removing the sediments, and controlling the adding amount of the sodium carbonate; (5) adjusting the pH of upper supernate back to 6.5 to 7.5; (6) performing evaporative crystallization to obtain a sodium chloride product; (7) cooling and crystallizing mother liquor to obtain coarse potassium chloride, and refining the coarse potassium chloride to obtain a potassium chloride product. The process recycles the garbage fly ash to obtain desulphurization gypsum, calcium carbonate, sodium chloride and potassium chloride products.

Description

technical field [0001] The invention relates to the technical field of waste fly ash treatment, in particular to a treatment process for resource utilization of waste fly ash. Background technique [0002] With the rapid development of urbanization, the output of domestic waste in my country has increased year by year, from 189 million in 2013 to 206 million tons in 2015. The proportion of incineration disposal is increasing year by year. Fly ash is an inevitable product of waste incineration, accounting for about 3-5% of the amount of waste incinerated. According to this calculation, the fly ash produced by waste incineration nationwide will be 10,000-20,000 tons / day in the future. Such a large amount of fly ash is generated, making how to safely and effectively dispose of incineration fly ash has become an urgent environmental and social problem to be solved. [0003] Fly ash is the fine particulate matter collected in the flue gas purification system, including the fly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10B09B3/00C01D3/04C01F11/18C01F11/46C02F101/12C02F101/20
CPCC01D3/04C01F11/18C01F11/46C02F9/00C02F2101/12C02F2101/20C02F1/66C02F1/62C02F5/02C02F1/04B09B3/80
Inventor 丁仲军朱晓青韩逸钟建华
Owner 丁仲军
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