Garbage incineration fly ash filter cake modification method

[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.