Garbage incineration fly ash filter cake modification method

A technology for waste incineration fly ash and filter cake, applied in cement production and other directions, can solve the problems of affecting the drying process of fly ash filter cake, high CaO content in fly ash, clogging inside the dryer, etc. Smooth, easy wall scraping effect

Inactive Publication Date: 2015-06-10
BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
2 Cites 6 Cited by

AI-Extracted Technical Summary

Problems solved by technology

This method uses water washing technology to pretreat the fly ash, which effectively reduces the harmful components in the fly ash and greatly improves the ability of the cement kiln to co-process the fly ash. However, in actual engineering operation, due to the High CaO content, small particle size, and larg...
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Method used

The modified fly ash filter cake of the present invention is transported to dryer by feeding conveying device, after drying, it is transported to kiln tail 1000 ℃ high-temperature section by metering conveying equipment...
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Abstract

The invention discloses a garbage incineration fly ash filter cake modification method including: first, adding fly ash, sodium carbonate, coal ash and water into a first-stage water washing stirring tank for water washing for three times, using a vacuum filter for solid-liquid separation of filtrate and filter cake after each time of water washing; wherein filtrate separated by first time solid-liquid separation is sent into a sewage tank for subsequent wastewater treatment; the second time and third time solid-liquid separated filtrates are respectively used as the first time and second time water washing water; the third time water washing is clear water washing. The third time solid-liquid separated filter cake is a modified fly ash filter cake, due to the less looseness and smaller viscosity, the feed conveying is smooth, drying machine material attachment is reduced, the strength of material blocks formed during drying of the filter cake is small, wall scrapping is easy, and scattering is smooth, the fly ash filter cake drying process can be performed normally, the problems existed in the real engineering can be solved, and the cement kiln co processing garbage incineration fly ash technology can be improved.

Application Domain

Cement production

Technology Topic

Co-processingSewage treatment +13

Image

  • Garbage incineration fly ash filter cake modification method

Examples

  • Experimental program(1)

Example Embodiment

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings.
[0019] like figure 1 Shown: the present invention includes a water washing treatment device combined with a water washing stirring tank and a vacuum filter set in three stages, wherein, the output end of the first water washing stirring tank 1 is connected with the first stage vacuum filter 2, and the first stage vacuum filter 2 is connected to the output end of the first stage vacuum filter 2. There are two output ports, one port is connected with the sewage tank 10, the other port is connected with the secondary water washing and stirring tank 3; the output end of the secondary water washing and stirring tank 3 is connected with the secondary vacuum filter 4, and the secondary vacuum The filter 4 is provided with 2 output ports, one end is connected with the 1# filtrate tank 9, and the other end is connected with the three-stage water washing and stirring tank 5; the output end of the three-stage water washing and stirring tank 5 is connected with the three-stage vacuum filter 6, The three-stage vacuum filter 6 is provided with two output ports, one end is connected with the 2# filtrate tank 8, and the other end is connected with the dryer 11 through the feeding conveying device; in addition, the 1# filtrate tank 9 and the 2# filtrate tank 8 They are respectively connected with the first-level water washing and stirring tank 1 and the second-level water washing and stirring tank 3, and the clean water tank 7 is connected with the third-level water washing and stirring tank 5.
[0020] The concrete operation of realizing the modification method of a kind of waste incineration fly ash filter cake of the present invention is:
[0021] 1) add fly ash, sodium carbonate, fly ash and water in the first-level water-washing stirring tank, wherein, the sodium carbonate addition is 5-15% of the fly ash weight, and the fly ash addition is 10-10% of the fly ash weight. 30%, the amount of water added is 2-4 times the weight of fly ash, and the fly ash is Class II or Class III fly ash;
[0022] 2) Start stirring for the first washing, the washing time is 20-30 minutes, after the washing is completed, the fly ash slurry is sent to a first-level vacuum filter for filtration and dehydration, and the filtrate and filter cake are separated from solid-liquid, and the filtrate is sent into sewage pool for subsequent sewage treatment;
[0023] 3) The filter cake obtained in step 2) enters the secondary washing and stirring tank for the second washing, and the water consumption is the same as the first washing, and the washing time is 10-20 minutes. After the washing is completed, the fly ash slurry is sent into The secondary vacuum filter is filtered and dehydrated, and the filtrate and the filter cake are separated from the solid and liquid, and the filtrate enters the 1# water washing stirring tank as the first washing water;
[0024] 4) The filter cake obtained in step 3) enters the three-stage water washing and stirring tank to carry out the third washing, and the washing water is clear water, and the water consumption is the same as the first washing, and the washing time is 5-10 minutes. The ash slurry is sent to a three-stage vacuum filter for filtration and dehydration, and the filtrate and the filter cake are separated from the solid-liquid. The filtrate enters the 2# water washing and stirring tank as the water for the second washing, and the filter cake is the modified fly ash filter cake of the present invention. .
[0025] The modified fly ash filter cake of the present invention is transported to the dryer through the feeding conveying device, and after drying, it is transported to the high temperature section above 1000° C. at the kiln end through the metering conveying device for calcination in the cement kiln, the dioxin is completely decomposed, and the Heavy metals are effectively fixed in the cement clinker lattice, so that the fly ash can be disposed of harmlessly and as a resource.

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