CN117619866A - Phosphorus resource recovery method for sludge incineration fly ash - Google Patents
Phosphorus resource recovery method for sludge incineration fly ash Download PDFInfo
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- CN117619866A CN117619866A CN202311403755.1A CN202311403755A CN117619866A CN 117619866 A CN117619866 A CN 117619866A CN 202311403755 A CN202311403755 A CN 202311403755A CN 117619866 A CN117619866 A CN 117619866A
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- Prior art keywords
- fly ash
- phosphorus
- sludge incineration
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- incineration fly
- Prior art date
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 239000011574 phosphorus Substances 0.000 title claims abstract description 56
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000010881 fly ash Substances 0.000 title claims abstract description 40
- 239000010802 sludge Substances 0.000 title claims abstract description 35
- 238000011084 recovery Methods 0.000 title claims abstract description 21
- 238000006298 dechlorination reaction Methods 0.000 claims abstract description 27
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000000460 chlorine Substances 0.000 claims abstract description 20
- 229910052801 chlorine Inorganic materials 0.000 claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 15
- 239000002699 waste material Substances 0.000 claims abstract description 13
- 238000001035 drying Methods 0.000 claims abstract description 11
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims abstract description 7
- 239000001110 calcium chloride Substances 0.000 claims abstract description 7
- 229910001628 calcium chloride Inorganic materials 0.000 claims abstract description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000003546 flue gas Substances 0.000 claims abstract description 5
- 238000000746 purification Methods 0.000 claims abstract description 5
- 238000004064 recycling Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract 2
- 229910001385 heavy metal Inorganic materials 0.000 claims description 35
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 13
- 239000000654 additive Substances 0.000 claims description 12
- 230000000996 additive effect Effects 0.000 claims description 12
- 239000002956 ash Substances 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 9
- 239000000243 solution Substances 0.000 claims description 7
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 6
- 239000012190 activator Substances 0.000 claims description 6
- 238000001704 evaporation Methods 0.000 claims description 6
- 230000008020 evaporation Effects 0.000 claims description 6
- 239000012047 saturated solution Substances 0.000 claims description 6
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 3
- 239000000920 calcium hydroxide Substances 0.000 claims description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000292 calcium oxide Substances 0.000 claims description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000002912 waste gas Substances 0.000 claims description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 2
- 239000000347 magnesium hydroxide Substances 0.000 claims description 2
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 2
- 239000000395 magnesium oxide Substances 0.000 claims description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- 239000011734 sodium Substances 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- 239000011149 active material Substances 0.000 claims 2
- 239000003513 alkali Substances 0.000 claims 1
- 239000000463 material Substances 0.000 claims 1
- 230000000153 supplemental effect Effects 0.000 claims 1
- 239000000047 product Substances 0.000 abstract description 22
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 abstract description 2
- 229910001617 alkaline earth metal chloride Inorganic materials 0.000 abstract description 2
- AZTGOPSQAGBNFT-UHFFFAOYSA-L calcium;sodium;sulfate Chemical compound [Na+].[Ca+2].[O-]S([O-])(=O)=O AZTGOPSQAGBNFT-UHFFFAOYSA-L 0.000 abstract description 2
- 239000012084 conversion product Substances 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 abstract description 2
- 235000011152 sodium sulphate Nutrition 0.000 abstract description 2
- 238000009283 thermal hydrolysis Methods 0.000 abstract description 2
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 9
- 229910019142 PO4 Inorganic materials 0.000 description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 5
- 239000010452 phosphate Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000002367 phosphate rock Substances 0.000 description 4
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- 239000013543 active substance Substances 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 150000001805 chlorine compounds Chemical class 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000004737 colorimetric analysis Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 229910052588 hydroxylapatite Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- XYJRXVWERLGGKC-UHFFFAOYSA-D pentacalcium;hydroxide;triphosphate Chemical compound [OH-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O XYJRXVWERLGGKC-UHFFFAOYSA-D 0.000 description 1
- 239000002686 phosphate fertilizer Substances 0.000 description 1
- 239000010801 sewage sludge Substances 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/70—Chemical treatment, e.g. pH adjustment or oxidation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B2101/00—Type of solid waste
- B09B2101/30—Incineration ashes
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention belongs to the technical field of sludge treatment, and particularly relates to a method for recycling phosphorus resources in sludge incineration fly ash. According to the invention, the heating furnace is segmented, water vapor of the drying section is led into the dechlorination section, and the dechlorination of the product is completed through high-temperature thermal hydrolysis reaction; generating calcium chloride in the chlorine recovery tower for recycling; sodium sulfate deacidification waste liquid in the existing sludge incineration flue gas purification system is mixed into the fly ash/calcium chloride raw material before entering the furnace, and calcium sodium sulfate is formed in the thermal conversion process to improve the phosphorus release effect of the phosphorus-rich product. The invention reduces the chlorine content in the thermal conversion product of the sludge incineration fly ash, does not need to add a large amount of alkaline earth metal chloride in the process, and can greatly improve the bioavailability of phosphorus in the product.
Description
Technical Field
The invention belongs to the technical field of sewage sludge treatment, and particularly relates to a method for recycling phosphorus resources in sludge incineration fly ash.
Background
There are a large amount of phosphorus resources in the sludge. Phosphorus exists only in the bound state in nature, usually in the form of phosphate. Phosphate is not renewable and most of phosphate is taken from phosphorite. The global demand for phosphorus resources is steadily increasing. The world population growth and the pursuit of higher living standards by developing nations has prompted phosphorus demand. In particular, the increased demand for meat consumption has prompted global phosphorus consumption. According to the related data, the phosphorite resource in China only accounts for 5.7 percent of the total world phosphorite resource by 2011, the proportion of rich phosphorite is lower, and the average grade (P) 2 O 5 ) Only about 17 percent, the prediction shows that the medium and high grade phosphate ores in China can only support the domestic demand of about 30 years, thereby the scarcity of phosphate ore resources in China can be improved year by year.
Existing methods for recovering phosphorus from fly ash mainly include wet chemical methods and heat treatment methods. The wet chemical method has the advantages of simple operation condition, less required equipment, large medicament consumption, long treatment time and complex process, and the heat treatment method has the advantages of simple process, small medicament consumption and high recovery potential. The Ash Dec method in the thermochemical method utilizes the characteristics of low melting point and high volatility of heavy metal chloride, and adds chlorine donor MgCl into the fly Ash 2 CaCl (CaCl) 2 And heating to about 1000 ℃ to enable heavy metal impurities to form volatile chlorides, and effectively removing the volatile chlorides through flue gas purification after volatilizing, wherein the residual ash can be directly used for producing the phosphate fertilizer.
However, the existing Ash Dec method has the following problems:
(1) To ensure efficient removal of heavy metals, it is necessary to add an excess of MgCl 2 CaCl (CaCl) 2 Thereby causing a large amount of chloride to remain in the product and increasing the difficulty of subsequent processing and utilization; mgCl to be added 2 CaCl (CaCl) 2 The cost is high, and the popularization and the application of the treatment process are affected;
(2) The phosphorus in the product exists in the form of hydroxyapatite due to the large addition of calcium and magnesium, so that the dissolution process of the phosphorus is slower.
Disclosure of Invention
Aiming at the problems of high chlorine content, large magnesium chloride/calcium chloride addition amount and slow release of phosphorus in the product of the Ash Dec technology, the existing heat treatment phosphorus recovery process of the sludge incineration fly Ash is improved, and the bioavailability of phosphorus in the product is greatly improved.
The invention provides a phosphorus resource recovery method of sludge incineration fly ash, which comprises the following steps: mixing the sludge incineration fly ash with a heavy metal removal additive and a phosphorus activator, and then sending the mixture into a sectional heating system for heating; the heating system is divided into a drying section, a heavy metal removal section and a dechlorination section, wherein steam generated in the drying section is introduced into the dechlorination section, waste gas generated in the dechlorination section enters a chlorine recovery tower, the product is recycled and used as a heavy metal removal additive, and the solid generated in the dechlorination section is cooled to obtain a phosphorus-rich product.
Further, the chlorine recovery tower of the present invention adopts a wet method, a dry method or a semi-dry method, preferably a semi-dry method.
Further, the active substances in the chlorine recovery tower adopt calcium oxide, magnesium oxide, calcium hydroxide and magnesium hydroxide or a mixture of the substances, preferably calcium oxide or calcium hydroxide, and the product obtained by dechlorination is recycled and used as a heavy metal removal additive.
Further, the phosphorus activator of the present invention may employ sodium-containing salts/bases and solutions thereof. Preferably, naOH solution and NaCO are adopted in the sludge incineration flue gas purification system 3 Solutions or NaOH/NaCO 3 And (3) deacidifying the mixed liquid to generate waste liquid or carrying out flash evaporation on the deacidified waste liquid to obtain saturated solution. Preferably, the deacidified waste liquid is a saturated solution obtained by flash evaporation.
Further, the temperature of the drying section is 100-200 ℃, the temperature of the heavy metal removing section is 900-1300 ℃, and the temperature of the dechlorination section is 800-1200 ℃.
Further, the residence time of the mixture of the sludge incineration fly ash, the heavy metal removal additive and the phosphorus activator in the heavy metal removal section is 10min-120min, and the residence time in the dechlorination section is 5min-120min.
Further, the range of the dosage amount Q (ClR) of the dechlorinated active substances of calcium chloride or magnesium chloride converted into dry substances in the chlorine recovery tower is Q (Ash) x 10< Q (ClR) < Q (Ash) x 10; preferred ranges of Q (ClR) are Q (Ash) c (Me) 30< Q (ClR) < Q (Ash) c (P) 5; further preferably Q (Ash) c (Me) 80< Q (ClR) < Q (Ash) c (P) 4. Wherein Q (Ash) is the treatment capacity of the fly Ash, c (Me) is the content of heavy metals Cu+Zn+Ni+Pb+Hg+Cr+Cd+As in the fly Ash, and c (P) is the content of phosphorus in the fly Ash.
Further, the gas generated by the heavy metal removing section is taken as a supplementary heat source of a heating furnace, and the inlet temperature of the separator is 150-450 ℃. The separator is preferably a cyclone separator.
The beneficial effects are that: the invention provides a phosphorus resource recovery method of sludge incineration fly ash shown in figure 1, which comprises the steps of dividing a single heating furnace used by a conventional technology into a plurality of heating steps, introducing steam of a drying section into a dechlorination section, and completing dechlorination of a product through high-temperature thermal hydrolysis reaction; generating calcium chloride in the chlorine recovery tower for recycling; sodium sulfate deacidification waste liquid in the existing sludge flue gas purification system is mixed into the fly ash/calcium chloride raw material before entering the furnace, and calcium sodium sulfate is formed in the thermal conversion process to improve the phosphorus release effect of the product. The invention reduces the chlorine content in the thermal conversion product of the sludge incineration fly ash, does not need to add a large amount of alkaline earth metal chloride in the process, and greatly improves the bioavailability of phosphorus in the product.
Drawings
FIG. 1 is a flow chart of an embodiment of a method for recovering phosphorus resources from sludge incineration fly ash according to the present invention.
Detailed Description
The invention will be described in further detail below with reference to the drawings by means of specific embodiments. The description of these embodiments is provided to assist understanding of the invention, but is not intended to limit the invention. In addition, the technical features of the embodiments of the invention described below may be combined with each other as long as they do not collide with each other.
Example 1
The phosphorus content of the fly ash obtained from a sludge incineration plant measured by the SMT method was 61.40mg/g, and the content of part of heavy metals was shown in Table 1.
TABLE 1 heavy metal content in sludge incineration fly ash
50g of sludge incineration fly ash is mixed with a saturated solution obtained by flash evaporation of a heavy metal removal additive and deacidification waste liquid from a wet deacidification tower of a sludge incineration plant. CaCl in heavy metal removal additive 2 The mass ratio of the fly ash to the fly ash is 1:5. the deacidification waste liquid comes from a NaOH wet deacidification tower of a sludge incineration plant, and the mass ratio of the deacidification waste liquid to fly ash is 10:1, the concentration of sodium ions, sulfate radicals and chloride ions in the deacidification tower waste liquid is 9964.3mg/L, 446.5mg/L and 1344.5mg/L respectively. The mixture is sent into a sectional heating system for heating, the heating system is divided into a drying section, a heavy metal removal section and a dechlorination section, wherein steam generated in the drying section is introduced into the dechlorination section, waste gas generated in the dechlorination section enters a chlorine recovery tower, and a deacidified product is used as a heavy metal removal additive. The temperature of the drying section is 105 ℃, the temperature of the heavy metal removing section is 1000 ℃, and the temperature of the dechlorination section is 1100 ℃. The residence time in the heavy metal removal section is 30min, and the residence time in the dechlorination section is 30min. Ca (OH) is adopted in the chlorine recovery tower 2 The emulsion absorbs HCl-rich gas generated in the dechlorination section, and the absorption product is used as the heavy metal removal additive. Cooling the solid after the dechlorination reaction to obtain the phosphorus-rich product. The phosphorus content of the product (converted to P 2 O 5 ) The content of the heavy metal was 19.2%, and the content of the heavy metal is shown in Table 2.
TABLE 2 partial heavy metal content
Comparative example 1 was set: the operation was exactly the same as in example 1, except that the dechlorination section was not added after the heavy metal removal section;
comparative example 2 was set: the procedure was exactly as in example 1, except that the saturated solution obtained by flash evaporation of the waste liquid from the wet deacidification tower of the sludge incineration plant was not added to the mixture of fly ash and heavy metal additive.
1. Dechlorination effect of phosphorus-rich products
The chlorine content of the phosphorus-rich product was determined to be 0.014% using the XRF method. If the dechlorination section (i.e. comparative example 1) is not added after the heavy metal removal section in the above steps, the chlorine content in the final phosphorus-rich product reaches 7.14%.
2. Improving effect of phosphorus bioavailability in phosphorus-rich product
Determining the bioavailability of phosphorus in the product: 0.100g of the sample was weighed with an analytical balance, added to a 50ml centrifuge tube, 30ml of a 2% citric acid solution (ph=2.11) was added, and the sample was ultrasonically dispersed for 25min with an ultrasonic disperser and oscillated at 230rpm for 1h at room temperature; after shaking, centrifuging at 10000rpm for 25min; the supernatant was filtered through Whatman filter paper and diluted, and the phosphorus content of the diluted solution was measured by molybdenum blue colorimetry. The ratio of available phosphorus extracted by citric acid in the total phosphorus of the final product reaches 77.4%. If the saturated solution (i.e. comparative example 2) obtained by flash evaporation of the waste liquid from the wet deacidification tower of the sludge incineration plant is not added to the mixture of fly ash and heavy metal additive in the above steps, the effective phosphorus ratio of the total phosphorus in the final product, which can be extracted by citric acid, is only 60.5%.
Although the foregoing embodiments have been described in some, but not all, embodiments of the invention, it should be understood that other embodiments may be devised in accordance with the present embodiments without departing from the spirit and scope of the invention.
Claims (9)
1. The phosphorus resource recovery method of the sludge incineration fly ash is characterized by comprising the following steps of: mixing sludge incineration fly ash with a heavy metal removal additive and a phosphorus activator, and sending the mixture into a sectional heating system for heating, wherein the heating system comprises a drying section, a heavy metal removal section and a dechlorination section;
and introducing water vapor generated by the mixture in the drying section into a dechlorination section, introducing waste gas generated by the dechlorination section into a chlorine recovery tower, taking a product in the chlorine recovery tower as a heavy metal removal additive, and cooling a solid generated by the dechlorination section to obtain a phosphorus-rich product.
2. The method for recovering phosphorus resources of sludge incineration fly ash according to claim 1, wherein the method for recovering chlorine in the chlorine recovery tower comprises a wet method, a dry method or a semi-dry method.
3. The phosphorus resource recovery method of sludge incineration fly ash according to claim 1 or 2, wherein the active material in the chlorine recovery tower comprises at least one of calcium oxide, magnesium oxide, calcium hydroxide and magnesium hydroxide.
4. The method for recovering phosphorus resources of sludge incineration fly ash according to claim 1, wherein the phosphorus activator comprises sodium-containing salt or alkali.
5. The method for recycling phosphorus resources of sludge incineration fly ash according to claim 4, wherein the phosphorus activator is NaOH solution and NaCO adopted in a sludge incineration flue gas purification system 3 Solutions or NaOH/NaCO 3 And (3) deacidifying the waste liquid of the mixed liquid or the saturated solution obtained after flash evaporation of the deacidified waste liquid.
6. The method for recovering phosphorus resources of sludge incineration fly ash according to claim 1, wherein the temperature of the drying section is 100 ℃ to 200 ℃, the temperature of the heavy metal removal section is 900 ℃ to 1300 ℃, and the temperature of the dechlorination section is 800 ℃ to 1200 ℃.
7. The method for recovering phosphorus resources of sludge incineration fly ash according to claim 1, wherein the residence time of the mixture in the heavy metal removal section is 10min to 120min and the residence time in the dechlorination section is 5min to 120min.
8. The method for recovering phosphorus resources from sludge incineration fly Ash according to claim 1, wherein the amount of the dechlorinated active material calcium chloride or magnesium chloride converted to the dry material amount Q (ClR) in the chlorine recovery tower is in the range of Q (Ash) c (Me) 10< Q (ClR) < Q (Ash) c (P) 10; wherein Q (Ash) is the treatment capacity of the fly Ash, c (Me) is the content of heavy metals Cu+Zn+Ni+Pb+Hg+Cr+Cd+As in the fly Ash, and c (P) is the content of phosphorus in the fly Ash.
9. The method for recovering phosphorus resources of sludge incineration fly ash according to claim 1, wherein the gas generated in the heavy metal removal section is used as a supplemental heat source of a heating furnace; the inlet temperature of the separator is 150-450 ℃.
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