CN214108269U

CN214108269U - System for recovering nonferrous metals from household garbage incineration fly ash and slag in cooperation

Info

Publication number: CN214108269U
Application number: CN202022974595.4U
Authority: CN
Inventors: 杜兵; 董健; 张恒; 戴小东; 葛亚军; 何骏; 彭淑婧; 杨金兵; 张铮; 魏亦然
Original assignee: Beijing Capital Environment Technology Co Ltd
Current assignee: Beijing Capital Environment Technology Co Ltd
Priority date: 2020-12-07
Filing date: 2020-12-07
Publication date: 2021-09-03
Anticipated expiration: 2030-12-07

Abstract

The utility model discloses a system for domestic waste burns flying ash and slag in coordination with recovery nonferrous metal, it includes flying ash grading plant, slag deironing device, first prilling apparatus, the second prilling apparatus, subregion melting device and flue gas condensing equipment, flying ash grading plant's coarse grain flying ash export and first prilling apparatus's pan feeding mouth intercommunication, flying ash grading plant's fine grain flying ash export and slag deironing device's discharge gate respectively with second prilling apparatus's pan feeding mouth intercommunication, first prilling apparatus and second prilling apparatus's discharge gate communicates with the pan feeding mouth of subregion melting device respectively, subregion melting device's the exhanst gas outlet and flue gas condensing equipment's the mouth that advances cigarette intercommunication. The utility model discloses a heavy metal separation and recovery in fly ash are handled with the high temperature melting of fly ash and slag, realize that the high-valued of fly ash and slag utilizes the detoxification that has realized the fly ash simultaneously, have further realized the zero release of incineration plant solid waste and have carried out reduction by a wide margin and innocent treatment to the fly ash.

Description

System for recovering nonferrous metals from household garbage incineration fly ash and slag in cooperation

Technical Field

The utility model relates to a domestic waste incineration disposal technical field, more specifically the theory that says so, it relates to a subject name.

Background

The development of waste incineration power generation is rapid, and the huge fly ash yield becomes a treatment problem. With the increasing purification level of flue gas, the fly ash from incineration of domestic garbage (hereinafter referred to as fly ash), which is the fine particles trapped by the flue gas purification system, becomes more and more dirty. Because heavy metals and dioxin pollutants with strong toxicity are enriched, the treatment of fly ash is always a focus and key link in pollution control and risk management of incineration plants. Since fly ash is a byproduct of a domestic waste incineration process and is generated along with domestic waste incineration treatment, the generation amount of fly ash inevitably increases with the increase of the scale and the treatment capacity of the domestic waste incineration treatment. The large landfill of the fly ash influences the storage capacity and the service life of a household garbage landfill.

With the gradual implementation of urban garbage classification, through classified putting and classified collection, the useful things such as metal, paper, rubber in the domestic garbage are recovered, the kitchen garbage is classified from the domestic garbage, the total amount of the garbage is reduced, but the heat value of the garbage is improved, and the content of metal in combustible garbage in other garbage is increased. Both fly ash and cinders contain relatively high levels of non-ferrous metals. With the progress of waste classification and the increasing level of consumer use, the increase in the content of nonferrous metals means the necessity of recycling is increasing. The calorific value of the waste and the composition of the part entering the incineration plant are similar to those of developed countries.

TABLE 1 heavy metal content in domestic and foreign incineration slag (unit mg/kg)

In germany where the classification of waste is well performed, the metal content in the remaining waste (similar to other waste in china) is about 2%, the metal content in commercial waste is solved by 5%, and the metal content in major waste reaches 5.5%. The recovery rate of iron in the slag is high and reaches 92.5% in developed countries, but the recovery rate of nonferrous metals is less than 30%, the recovery rate is only 10% in most cases, and the recovery rate of the nonferrous metals reaches 50-60% in some advanced waste incineration plants.

TABLE 2 heavy metal content (unit mg/kg) in fly ash from domestic and foreign incineration

	Zn	Cu	Pb	Cd
					Japanese	21000	1800	3750	225
Scotland	17000	600	8000	300
					Europe	9000-70,000	600-3200	5300-26,000	50-450
Beijing	6850	695	2565	138

Comparing the non-ferrous metal content in the bottom ash and fly ash in developed countries and cities in China (tables 1 and 2), it can be found that both fly ash and slag contain high content of non-ferrous metal. Secondly, the content of nonferrous metals in the slag and the fly ash in China is found to be greatly different, but the difference is gradually similar along with the deep classification of garbage and the improvement of the living consumption level, and the increase of the content of the nonferrous metals means the increasing of the necessity of recoverability.

At present, the resource utilization of slag is mainly used as a partial substitute aggregate of concrete, a substitute aggregate of a petroleum asphalt pavement, a covering material of a landfill site and a building material. The technology for extracting the nonferrous metals in the fly ash comprises water washing, acid washing and extraction technology and microbiological chemical extraction technology. The water washing is used as an effective pretreatment mode, can obviously improve the treatment effects of cement solidification, cement kiln cooperative treatment, sintering/melting and other methods, and also provides hope for large-scale resource utilization of subsequent products (such as cement, lightweight aggregate and the like). However, part of heavy metals can be dissolved in the water washing liquid in the water washing process, and the solution still needs to be treated before reaching the standard and being discharged. The biological/chemical extraction technology for heavy metals has the advantages of simple process, strong operability, extraction and recovery of heavy metals and the like. However, the extraction technology is generally high in cost, because the culture of microorganisms and the purchase of various chemical agents and chelating agents are required, the concentration of heavy metals in the fly ash is generally very low, and the cost of the required agents cannot be offset by the recovered heavy metals.

The fly ash and the non-ferrous slag metal are recycled to obtain a multi-metal mixture product, and the product has higher non-ferrous metal grade and higher value. The recovery technology of high-performance high-value products is a great trend of fly ash slag resource utilization in the future.

Based on the above analysis, the recovery of non-ferrous metals from fly ash and slag is of great importance. However, the traditional recourse to additional materials and reagents may increase the economic cost and environmental risk of metal recovery. At present, the treatment of fly ash and the treatment of slag are carried out independently, how to utilize resource attributes and elements of waste in an incineration plant to complement each other to achieve the aim of cooperative treatment, and the fly ash and the slag can not only recover nonferrous metals, but also make residual residues have higher building material quality, so that the problem to be solved is urgently needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects in the prior art, and provides a system for recovering nonferrous metals from household garbage incineration fly ash and slag in a synergic manner so as to realize the grading separation of the nonferrous metal elements in the fly ash and the slag from a slag system.

In order to achieve the above purpose, the utility model provides a following technical scheme:

a system for recycling nonferrous metals by cooperation of household garbage incineration fly ash and slag comprises a fly ash grading device, a slag deironing device, a first granulating device, a second granulating device, a partition melting device and a flue gas condensing device, wherein the fly ash grading device is used for dividing fly ash into fine-particle fly ash and coarse-particle fly ash, a coarse-particle fly ash outlet of the fly ash grading device is communicated with a feeding port of the first granulating device, a fine-particle fly ash outlet of the fly ash grading device and a discharging port of the slag deironing device are respectively communicated with a feeding port of the second granulating device, a discharging port of the first granulating device and a discharging port of the second granulating device are respectively communicated with a feeding port of the partition melting device, and a flue gas outlet of the partition melting device is communicated with a flue gas inlet of the flue gas condensing device.

Furthermore, a first temperature area, a second temperature area and a third temperature area with the temperature from low to high are arranged in the subarea melting device, a discharge port of the second granulating device is communicated with a feed port of the first temperature area, a slag outlet of the first temperature area is communicated with a feed port of the second temperature area, a slag outlet of the second temperature area is communicated with a feed port of the third temperature area, a discharge port of the first granulating device is communicated with a feed port of the third temperature area, and smoke outlets of the first temperature area, the second temperature area and the third temperature area are respectively communicated with a smoke inlet of the smoke condensing device.

Preferably, the zone melting device is an arc melting furnace.

Preferably, the fly ash classification device is a cyclone classifier.

Further, the slag deironing device is including the first de-ironing separator who is used for realizing the slag one-level deironing that connects gradually, be used for carrying out the shale shaker that sieves to the slag behind the one-level deironing, be used for carrying out broken ball mill and be used for carrying out the second de-ironing separator of second grade deironing to the broken slag of ball mill to the slag granule that obtains after the shale shaker screening, the discharge gate of second de-ironing separator and second prilling granulator's pan feeding mouth intercommunication.

Further, the system for recovering nonferrous metals by using the household garbage incineration fly ash and the slag in a synergic manner further comprises a water quenching device, and a slag inlet of the water quenching device is connected with a slag outlet of the third temperature zone.

Furthermore, the system for recovering nonferrous metals by using the household garbage incineration fly ash and the slag in a synergic manner further comprises a flue gas treatment system connected with a flue gas condensing device, and a flue gas outlet of the flue gas condensing device is communicated with a flue gas inlet of the flue gas treatment system.

To sum up, the utility model discloses compare and have following beneficial effect in prior art:

(1) the non-ferrous metals in the fly ash and the slag are recovered, and particularly, zinc chloride, lead chloride and cadmium chloride products are obtained, can be sold as metal raw materials of certain grade, generate economic benefit and realize high-value utilization of the fly ash and the slag.

(2) Heavy metals in the fly ash are separated through high-temperature melting treatment of the fly ash and the slag, so that the detoxification of the fly ash is realized, and the fly ash is converted into a safe building material.

(3) The zero emission of solid waste in an incineration plant is completely realized, and fly ash and slag in the incineration plant are converted into building raw materials and are sold in the market.

(4) The fly ash is greatly reduced and harmlessly treated, the mass reduction can reach 90 percent, and the volume reduction can reach 95 percent.

(5) The heat source for the synergistic melting treatment of the fly ash and the slag is from an incineration plant, and no outsourced fuel and heat source are needed, so that the utilization rate of heat of the incineration plant is improved.

Drawings

Fig. 1 is a schematic structural diagram of a system for recovering nonferrous metals from fly ash from incineration of household garbage and slag in cooperation with an embodiment of the present invention in embodiment 1.

In the figure: 100. a fly ash classification device; 210. a first granulation device; 220. a second granulation device; 300. a slag iron removal device; 310. a first de-ironing separator; 320. vibrating screen; 330. a ball mill; 340. a second iron remover; 400. a zone melting device; 410. a first temperature zone; 420. a second temperature zone; 430. a third temperature zone; 500. water quenching equipment; 600. a flue gas condensing unit; 700. a flue gas treatment system; 800. and (4) a chimney.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the following description, together with the drawings of the present invention, clearly and completely describes the technical solution of the present invention, and based on the embodiments in the present application, other similar embodiments obtained by those skilled in the art without creative efforts shall all belong to the protection scope of the present application. In addition, directional terms such as "upper", "lower", "left", "right", etc. in the following embodiments are directions with reference to the drawings only, and thus, the directional terms are used for illustrating the present invention and not for limiting the present invention.

Detailed description of the preferred embodiment 1

The utility model discloses the technical problem who mainly solves is how to realize that the nonferrous metal element in domestic waste incineration fly ash and the slag separates from the slag system in the grading, separates Zn, Cd, Pb, Cu and Ba in fly ash and the slag from the slag particularly, obtains the mixture of certain or several kinds of metal. The principle is as follows:

the fly ash and slag contain about 1.2-2.0% of non-ferrous metal elements, wherein the non-ferrous elements are mainly in the form of Me-O, Me-Si-O. The fly ash contains a large amount of inorganic chloride (mainly NaCl, KCl and CaCl)₂) In SiO₂、SO₂、Fe₂O₃、Al₂O₃Decomposing to generate HCl or Cl under the action of the like₂Gas, SiO₂、SO₂、Fe₂O₃、Al₂O₃Mainly to produce the action of a promoter or a catalyst. The decomposition of NaCl and KCl occurs at 500-650 ℃, and the reaction equation is as follows:

NaCl+SO₂+O₂＝Na₂SO₄+Cl₂ (1)

SO₂+O₂＝SO₃ (2)

NaCl+2SO₃＝Na₂SO₄+Cl₂+SO₂ (3)

NaCl+H₂O+SiO₂＝Na₂SiO₃+HCl

CaCl₂usually at elevated temperatures (>1200 deg.C) to decompose, the reaction equation is as follows:

CaCl₂+SO₂＝CaSO₄+Cl₂ (4)

CaCl₂+2SO₃＝CaSO₄+SO₂+Cl₂ (5)

different temperature conditions for decomposing different chlorides are utilized, and different chlorinating agents are required to be added in different temperature intervals.

The metal (silicon) oxide is subjected to chlorination reaction under the action of chlorine gas. The chlorination reaction equation for (silicon) oxides of Cu is as follows:

Cu₂SiO₄+2Cl₂＝2CuCl₂+SiO₂+O₂ (6)

3CuO+2HCl＝2/3 Cu₃Cl₃+H₂O+1/2O₂ (7)

zn, Pb and Cd in fly ash exist mainly in the form of chloride. The equation for chlorination of the silicon oxides of Zn, Pb and Ba in the slag is as follows:

Zn₂SiO₄+2Cl₂＝2ZnCl₂+SiO₂+O₂ (8)

Zn₂SiO₄+4HCl＝2ZnCl₂+SiO₂+2H₂O (9)

Pb₂SiO₄+2Cl₂＝2PbCl₂+SiO₂+O₂ (10)

Pb₂SiO₄+4HCl＝2PbCl₂+SiO₂+2H₂O (11)

Ba₂SiO₄+2Cl₂＝2BaCl₂+SiO₂+O₂ (12)

Ba₂SiO₄+4HCl＝2BaCl₂+SiO₂+2H₂O (13)

the grading recovery of the metal chloride is realized by utilizing the difference of the boiling points of the metal chloride. The boiling points of the metal chlorides are shown in Table 3.

TABLE 3 boiling points of the metal chlorides

Metal chlorides	ZnCl₂	PbCl₂	CdCl₂	CuCl₂	BaCl₂
						Boiling point/. degree.C	732	950	960	1400	1560

Therefore, according to the difference of the boiling points of different metal chlorides, the temperature range of the action of the chlorinating agent is combined, the separation of the chlorides is divided into three temperature ranges for respective recovery, Zn is recovered in a low-temperature section (<750 ℃), Pb and Cd is recovered in a medium-temperature section (750-.

To sum upSynergistic treatment of fly ash with slag is based on Cl produced by pyrolysis of fly ash containing higher levels of chloride₂And HCl, which has chlorination effect on non-ferrous metal compounds in fly ash and slag, and realizes separation and recovery of different metal elements by using the difference of the boiling points of metal chlorides.

Based on the above principle, the present embodiment proposes a system for recovering nonferrous metals from fly ash from incineration of household garbage and slag in cooperation, as shown in fig. 1, the system comprises a fly ash grading device 100 for dividing fly ash into fine-particle fly ash and coarse-particle fly ash, a slag deironing device 300, a first granulation device 210, a second granulation device 220, a zone melting device 400 and a flue gas condensing device 600, wherein a coarse-particle fly ash outlet of the fly ash grading device 100 is communicated with a feeding port of the first granulation device 210, a fine-particle fly ash outlet of the fly ash grading device 100 and a discharging port of the slag deironing device 300 are respectively communicated with a feeding port of the second granulation device 220, a discharging port of the first granulation device 210 and a discharging port of the second granulation device 220 are respectively communicated with a feeding port of the zone melting device 400, and a flue gas outlet of the zone melting device 400 is communicated with a smoke inlet of the flue gas condensing device 600. The fly ash classification device 100 classifies fly ash generated by burning household garbage into fine particle fly ash and coarse particle fly ash, the slag deironing device 300 performs deironing pretreatment on slag, the deironing pretreated slag and the fine particle fly ash are uniformly mixed and granulated in the second granulation device 220, and the coarse particle fly ash is granulated by the first granulation device 210.

Further, the slag deironing device 300 includes a first deironing device 310 for realizing first-level deironing of slag, a vibrating screen 320 for screening the slag after the first-level deironing, a ball mill 330 for crushing slag particles obtained after screening the vibrating screen 320, and a second deironing device 340 for performing second-level deironing on the slag crushed by the ball mill 330, which are connected in sequence, and a discharge port of the second deironing device 340 is communicated with a feed port of the second granulation device 220.

Specifically, after being discharged and collected, the slag is separated from the iron filings in the slag in the first iron remover 310 by means of magnetic separation, so as to obtain a first-stage iron-removed slag; and screening the slag subjected to the first-stage iron removal by using a vibrating screen 320 with 5mm screen holes, separating large particles and coarse particles with the particle size of more than +5mm, crushing the slag with the particle size of 0-5mm by using a ball mill 330 to obtain 2.5-5 mm slag, performing second-stage iron removal on the obtained 2.5-5 mm slag in a second-stage iron remover in a magnetic separation mode, and finally obtaining non-iron-containing slag. And adding non-ferrous slag and fine particle fly ash into a second granulator, mixing and granulating, wherein the particle size of the granules is 10 mm.

Preferably, the mixing ratio of the non-ferrous slag to the fine particle fly ash is 1:4, which is advantageous for the sufficient progress of the synergistic reaction according to the above reaction principle.

Further, a first temperature zone 410, a second temperature zone 420 and a third temperature zone 430 with the temperature from low to high are arranged in the zone melting device 400, a discharge port of the second granulation device 220 is communicated with a feed port of the first temperature zone 410, a slag outlet of the first temperature zone 410 is communicated with a feed port of the second temperature zone 420, a slag outlet of the second temperature zone 420 is communicated with a feed port of the third temperature zone 430, a discharge port of the first granulation device 210 is communicated with a feed port of the third temperature zone 430, and flue gas outlets of the first temperature zone 410, the second temperature zone 420 and the third temperature zone 430 are respectively communicated with a flue gas inlet of the flue gas condensation device 600.

Specifically, the first temperature zone 410 is a low-temperature zone, the temperature is set to 700 ℃ to 730 ℃, the residence time in the low-temperature zone is 10min, the effect is to fully recover the flue gas under the low-temperature zone, the main component of the flue gas generated in the low-temperature zone is zinc chloride, and the flue gas is condensed by a flue gas condensing device 600 to obtain zinc chloride particles so as to realize zinc recovery; the second temperature zone 420 is a middle temperature zone, the temperature is set to be 950-1000 ℃, the retention time in the middle temperature zone is 20min, the second temperature zone has the function of fully recovering the flue gas under the middle temperature zone, and the main components of the flue gas are lead chloride and cadmium chloride, so that the recovery of lead and cadmium is achieved; the third temperature zone 430 is a high temperature zone, the temperature is set to 1500-1600 ℃, and the third temperature zone has the function of fully recycling the flue gas at the high temperature zone, wherein the flue gas at the moment mainly comprises copper chloride and barium chloride, so that the recycling of copper and barium is realized.

In this embodiment, the zone melting apparatus 400 is an arc melting furnace, and both the first granulation apparatus 210 and the second granulation apparatus 220 are granulators.

Preferably, the fly ash classifying device 100 is a cyclone classifier, which has the advantages of simple structure, stable and reliable operation, low cost, convenient maintenance, etc.

Further, the system for recovering nonferrous metals from incineration fly ash of household garbage and slag in cooperation further includes a water quenching apparatus 500, wherein a slag inlet of the water quenching apparatus 500 is connected with a slag outlet of the third temperature zone 430, and the water quenching apparatus 500 receives and cools the remaining fly ash and slag melt in the third temperature zone 430 to form vitrified slag.

Further, the system for recovering nonferrous metals by using the cooperation of the household garbage incineration fly ash and the slag further comprises a flue gas treatment system 700 and a chimney 800 connected with the flue gas treatment system 700, a flue gas outlet of the flue gas condensation device 600 is communicated with a flue gas inlet of the flue gas treatment system 700, a flue gas outlet of the flue gas treatment system 700 is communicated with the atmosphere through the chimney 800, the flue gas which is not condensed in the flue gas condensation device 600 is purified through the flue gas treatment system 700, and the flue gas purified by the flue gas treatment system 700 is discharged into the atmosphere through the chimney 800, so that pollution-free treatment is realized.

When the household garbage incineration fly ash separation device is used specifically, household garbage incineration fly ash is conveyed to a cyclone classifier through a fan and a screw conveyor, the classification particle size of the cyclone classifier is set to be 10 micrometers, fly ash particles are divided into two parts of fine particle fly ash and coarse particle fly ash through the cyclone classifier and are respectively marked as FA-1 and FA-2, wherein the particle size of FA-1 is larger than 10 micrometers, and the particle size of FA-2 is smaller than 10 micrometers.

The household garbage incineration slag is conveyed to the first iron remover 310 by the scraper conveyor for primary iron removal, the slag with iron removed by the first iron remover 310 enters the vibrating screen 320, the screen holes are 5mm, undersize materials with the size fraction smaller than 5mm are conveyed to the ball mill 330 for crushing, and the crushed slag enters the second iron remover 340 for secondary iron removal. And (3) feeding the deironized slag material and fly ash FA-2 into a second granulator, adding a proper amount of binder, uniformly mixing and granulating, and marking the granulated mixed material as F1B 4.

Conveying the F1B4 to a low-temperature area of an electric arc melting furnace by a screw conveyor for heating, raising the temperature to 700-730 ℃, staying at the temperature for 10min, feeding flue gas generated in the melting process into a flue gas condenser, condensing to obtain flue gas particles A, wherein the flue gas particles A are particles with zinc chloride as a main component, and feeding the cooled flue gas into a flue gas treatment system 700 for emission after reaching the standard. F1B4 was then sent to a low temperature zone for elevated temperature.

And pouring the molten slag subjected to low-temperature melting into an intermediate-temperature melting zone, raising the temperature to 950-1000 ℃, preserving the heat for 20min at the temperature, introducing the flue gas generated in the melting process into a condenser, condensing to obtain flue gas particulate matters B, introducing the cooled flue gas into a flue gas treatment system 700, and discharging after reaching the standard. Then the materials in the low temperature area are conveyed to the medium temperature area for melting.

Pouring the slag in the middle temperature area into the high temperature area, then mixing and pouring the granulated FA-1, raising the temperature to 1450-1500 ℃, keeping the temperature for 20min, then feeding the flue gas generated in the melting process into a condenser, condensing to obtain flue gas particles C, feeding the cooled flue gas into a flue gas treatment system 700, and discharging after reaching the standard. And continuously pouring the slag in the medium-temperature area into the high-temperature area for heating and melting, and finally performing water quenching treatment on the slag in the high-temperature area to obtain vitrified slag.

Above only the utility model discloses an it is preferred embodiment, the utility model discloses a scope of protection not only limits in above-mentioned embodiment, and the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The system is characterized by comprising a fly ash grading device, a slag deironing device, a first granulating device, a second granulating device, a partition melting device and a flue gas condensing device, wherein the fly ash grading device is used for dividing fly ash into fine-particle fly ash and coarse-particle fly ash, a coarse-particle fly ash outlet of the fly ash grading device is communicated with a feeding port of the first granulating device, a fine-particle fly ash outlet of the fly ash grading device and a discharge port of the slag deironing device are respectively communicated with a feeding port of the second granulating device, a discharge port of the first granulating device and a discharge port of the second granulating device are respectively communicated with a feeding port of the partition melting device, and a flue gas outlet of the partition melting device is communicated with a flue gas inlet of the flue gas condensing device.

2. The system for recovering nonferrous metals by using cooperation of household garbage incineration fly ash and slag according to claim 1, wherein a first temperature zone, a second temperature zone and a third temperature zone are arranged in the zone melting device, the temperatures of the first temperature zone, the second temperature zone and the third temperature zone are from low to high, a discharge port of the second granulating device is communicated with a feed port of the first temperature zone, a slag outlet of the first temperature zone is communicated with a feed port of the second temperature zone, a slag outlet of the second temperature zone is communicated with a feed port of the third temperature zone, a discharge port of the first granulating device is communicated with a feed port of the third temperature zone, and flue gas outlets of the first temperature zone, the second temperature zone and the third temperature zone are respectively communicated with a flue gas inlet of a flue gas condensing device.

3. The system for recovering nonferrous metals using fly ash from incineration of household garbage together with slag according to claim 2, wherein the zone-melting device is an arc melting furnace.

4. The system for recovering nonferrous metals using fly ash from incineration of household garbage together with slag according to claim 1, wherein the fly ash classifying means is a cyclone classifier.

5. The system for recovering nonferrous metals by using household garbage incineration fly ash and slag in a synergic manner according to claim 1, wherein the slag iron removal device comprises a first iron remover for realizing primary iron removal of the slag, a vibrating screen for screening the slag after the primary iron removal, a ball mill for crushing slag particles obtained after screening by the vibrating screen, and a second iron remover for performing secondary iron removal on the slag crushed by the ball mill, which are connected in sequence, and a discharge port of the second iron remover is communicated with a feed port of the second granulation device.

6. The system for cooperative recovery of non-ferrous metals from fly ash from incineration of domestic waste and slag as claimed in claim 2, wherein the system for cooperative recovery of non-ferrous metals from fly ash from incineration of domestic waste and slag further comprises a water quenching device, and the slag inlet of the water quenching device is connected to the slag outlet of the third temperature zone.

7. The system for cooperative recovery of non-ferrous metals from fly ash from incineration of domestic waste and slag as claimed in claim 2, wherein the system for cooperative recovery of non-ferrous metals from fly ash from incineration of domestic waste and slag further comprises a flue gas treatment system connected to a flue gas condensing device, and the flue gas outlet of the flue gas condensing device is communicated with the flue gas inlet of the flue gas treatment system.