CN109420662A - A kind of system of municipal administration and metallurgical difficult solid waste collaboration resource utilization - Google Patents
A kind of system of municipal administration and metallurgical difficult solid waste collaboration resource utilization Download PDFInfo
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- CN109420662A CN109420662A CN201710744572.4A CN201710744572A CN109420662A CN 109420662 A CN109420662 A CN 109420662A CN 201710744572 A CN201710744572 A CN 201710744572A CN 109420662 A CN109420662 A CN 109420662A
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- gas
- section
- roasting
- inlet
- flue gas
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- 239000002910 solid waste Substances 0.000 title claims abstract description 22
- 239000000428 dust Substances 0.000 claims abstract description 133
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 127
- 239000011707 mineral Substances 0.000 claims abstract description 127
- 238000001035 drying Methods 0.000 claims abstract description 118
- 238000002156 mixing Methods 0.000 claims abstract description 66
- 239000010881 fly ash Substances 0.000 claims abstract description 57
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 21
- 239000011701 zinc Substances 0.000 claims abstract description 21
- 239000007789 gas Substances 0.000 claims description 283
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 200
- 239000003546 flue gas Substances 0.000 claims description 198
- 238000011084 recovery Methods 0.000 claims description 179
- 238000001816 cooling Methods 0.000 claims description 172
- 239000000843 powder Substances 0.000 claims description 94
- 239000007788 liquid Substances 0.000 claims description 82
- 238000005507 spraying Methods 0.000 claims description 69
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 62
- 239000007921 spray Substances 0.000 claims description 43
- 238000000227 grinding Methods 0.000 claims description 42
- 229910052751 metal Inorganic materials 0.000 claims description 39
- 239000002184 metal Substances 0.000 claims description 39
- 238000004056 waste incineration Methods 0.000 claims description 37
- 239000002585 base Substances 0.000 claims description 33
- 238000006386 neutralization reaction Methods 0.000 claims description 31
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 30
- 238000003825 pressing Methods 0.000 claims description 27
- 239000000654 additive Substances 0.000 claims description 25
- 230000000996 additive effect Effects 0.000 claims description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 238000000746 purification Methods 0.000 claims description 21
- 239000007787 solid Substances 0.000 claims description 20
- 239000003245 coal Substances 0.000 claims description 19
- 238000007605 air drying Methods 0.000 claims description 17
- 238000001914 filtration Methods 0.000 claims description 17
- 238000007664 blowing Methods 0.000 claims description 13
- 238000005260 corrosion Methods 0.000 claims description 12
- 238000003860 storage Methods 0.000 claims description 12
- 239000012528 membrane Substances 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- 239000003513 alkali Substances 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 9
- 239000010949 copper Substances 0.000 claims description 9
- 239000002737 fuel gas Substances 0.000 claims description 7
- 239000000919 ceramic Substances 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 40
- 238000005660 chlorination reaction Methods 0.000 abstract description 21
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 8
- 239000012320 chlorinating reagent Substances 0.000 abstract description 3
- 238000005272 metallurgy Methods 0.000 abstract 2
- 235000010755 mineral Nutrition 0.000 description 108
- 239000008188 pellet Substances 0.000 description 83
- 239000000463 material Substances 0.000 description 57
- 239000011812 mixed powder Substances 0.000 description 23
- 150000002739 metals Chemical class 0.000 description 21
- 239000000706 filtrate Substances 0.000 description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 18
- 239000011133 lead Substances 0.000 description 17
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 12
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 10
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 10
- 239000000460 chlorine Substances 0.000 description 10
- 229910052801 chlorine Inorganic materials 0.000 description 10
- 238000009851 ferrous metallurgy Methods 0.000 description 10
- 239000012065 filter cake Substances 0.000 description 10
- 238000012546 transfer Methods 0.000 description 10
- 230000029087 digestion Effects 0.000 description 9
- 229910052742 iron Inorganic materials 0.000 description 9
- 238000005406 washing Methods 0.000 description 9
- 150000001805 chlorine compounds Chemical class 0.000 description 8
- 238000005453 pelletization Methods 0.000 description 8
- 239000001110 calcium chloride Substances 0.000 description 7
- 229910001628 calcium chloride Inorganic materials 0.000 description 7
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 7
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 7
- 239000002994 raw material Substances 0.000 description 7
- 238000001238 wet grinding Methods 0.000 description 7
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 description 6
- HWSZZLVAJGOAAY-UHFFFAOYSA-L lead(II) chloride Chemical compound Cl[Pb]Cl HWSZZLVAJGOAAY-UHFFFAOYSA-L 0.000 description 6
- 239000011592 zinc chloride Substances 0.000 description 6
- 235000005074 zinc chloride Nutrition 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000000440 bentonite Substances 0.000 description 5
- 229910000278 bentonite Inorganic materials 0.000 description 5
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical group O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 5
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 5
- 238000009833 condensation Methods 0.000 description 5
- 230000005494 condensation Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 238000005469 granulation Methods 0.000 description 4
- 230000003179 granulation Effects 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 229910001510 metal chloride Inorganic materials 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000010813 municipal solid waste Substances 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 229910052783 alkali metal Inorganic materials 0.000 description 3
- 150000001340 alkali metals Chemical class 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 239000002817 coal dust Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000000112 cooling gas Substances 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 230000023556 desulfurization Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 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 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000001079 digestive effect Effects 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 239000003570 air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009264 composting Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- -1 ferrous metals Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000009865 steel metallurgy Methods 0.000 description 1
- 239000013589 supplement 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/60—Combinations of devices covered by groups B01D46/00 and B01D47/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/001—Dry processes
- C22B7/002—Dry processes by treating with halogens, sulfur or compounds thereof; by carburising, by treating with hydrogen (hydriding)
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2247/00—Details relating to the separation of dispersed particles from gases, air or vapours by liquid as separating agent
- B01D2247/04—Regenerating the washing fluid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/10—Inorganic absorbents
- B01D2252/103—Water
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Geology (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The system of a kind of municipal administration and metallurgy difficult solid waste collaboration resource utilization, the system include: 1) proportioner: proportioner includes feed bin；2) mixing arrangement: feed bin is connect by the first mineral aggregate conveying device with mixing arrangement；3) damp mill: mixing arrangement is connect by third mineral aggregate conveying device with damp mill；4) pelletizer: damp mill is connect by the 4th mineral aggregate conveying device with pelletizer；5) drying device: pelletizer is connect by the 5th mineral aggregate conveying device with drying device；6) preheating device: drying device is connect by the 6th mineral aggregate conveying device with preheating device；7) calciner: preheating device is connect by the 7th mineral aggregate conveying device with calciner.The present invention using incineration of refuse flyash as chlorinating agent, using heavy metal metallurgies dust such as the leaded, zinc of high temperature chlorination roasting process.
Description
Technical Field
The invention relates to the field of solid waste resource utilization, in particular to a municipal and metallurgical difficultly-treated solid waste cooperative resource utilization system or a system for resource utilization of waste incineration fly ash and ferrous metallurgy dust. Mainly solves the environmental and social problems caused by the improper disposal of the waste incineration fly ash and the metallurgical solid waste.
Background
With the accelerated development of urbanization in China, the yield of municipal refuse in China is continuously increased. The current garbage disposal is mainly landfill, incineration and composting, wherein the incineration disposal has the advantages of volume reduction and decrement, and can generate electricity, and the method is widely applied in recent years. However, the fly ash, which is a byproduct generated by burning garbage, is a dangerous waste, and is rich in pollutants such as dioxin, heavy metals, chlorine and the like, so that the fly ash is harmful, difficult to treat and easy to cause secondary pollution. The fly ash treatment methods at home and abroad mainly comprise cement solidification, medicament stabilization, high-temperature solidification and the like, the cement solidification or medicament stabilization treatment has large occupied area and poor long-term stability of heavy metal, and the high-temperature solidification has large investment and low yield.
The ferrous metallurgy industry is a recycling industry which can highly recycle resources and energy, the steel production capacity is rapidly increased along with the rapid development of the steel industry in China, and steel enterprises generate a large amount of metallurgical slag and metallurgical dust in the production process, so that the environmental pollution pressure is increasingly increased. With the increasing of the national pollution regulation and control force, the treatment of metallurgical slag and metallurgical dust is highly valued by the whole industry.
At present, the main method for treating metallurgical dust in a steel plant is to collect the dust and then return the dust to sintering, and the sintered mineral content is easy to be unstable when the dust is mixed into the sintering due to large fluctuation of chemical components, in addition, because the metallurgical dust contains more volatile elements such as lead, zinc, alkali metal and the like, the metallurgical dust can be continuously and circularly enriched in a blast furnace to cause blast furnace accretion, so that the large-scale treatment of the metallurgical dust is restricted, a large amount of dust can only be buried or stacked, not only the waste of land resources is caused, the environment is polluted, but also the valuable elements in the metallurgical dust are wasted.
Metals and their oxides and other complex compounds, under certain conditions, most of them can form metal chlorides with chlorine with very high chemical activity. Compared with other compounds of corresponding metals, most of various metal chlorides have the properties of low melting point, high volatility, easy reducibility and the like, and the aims of metal separation, enrichment, extraction and refining can be effectively realized respectively according to the property difference of the chlorides, but the chlorination roasting process needs to consume expensive chlorinating agents, so that the large-scale application and development of the metal chlorides are limited.
Disclosure of Invention
The waste incineration fly ash is fine particulate matter trapped in a flue gas purification system and a heat recovery system of a waste incineration plant, accounts for about 3-5% of the amount of the incineration waste, is typical urban solid waste, contains about 15% of chlorine element, and aims at solving the treatment difficulty of the prior heavy metal metallurgical dust containing zinc and the like and the characteristics of the waste incineration fly ash. The invention uses waste incineration fly ash as chlorinating agent, and adopts high-temperature chloridizing roasting process to treat heavy metal metallurgical dust containing lead, zinc and the like, and the main process comprises the following working procedures: proportioning, mixing, wet grinding, pelletizing, drying, preheating, roasting, cooling, flue gas treatment, valuable metal recovery and the like.
According to the first embodiment provided by the invention, a system for realizing the cooperative resource utilization of municipal and metallurgical difficultly-treated solid waste, or a system for realizing the cooperative high-temperature chloridizing roasting of waste incineration fly ash and ferrous metallurgy dust, is provided.
A municipal and metallurgical difficult-to-treat solid waste is system of utilization as resource in coordination, and this system includes:
1) the batching device: the batching device comprises a stock bin;
2) a mixing device: the discharge hole of the storage bin is connected with the feed inlet of the mixing device through a first mineral aggregate conveying device;
3) a moistening and grinding machine: the discharge hole of the mixing device is connected with the feed hole of the moistening and grinding machine through a third mineral aggregate conveying device;
4) pelletizing: the discharge hole of the moistening and grinding machine is connected with the feed inlet of the pelletizer through a fourth mineral aggregate conveying device;
5) a drying device: the discharge hole of the pelletizer is connected with the feed hole of the drying device through a fifth mineral aggregate conveying device;
6) a preheating device: the discharge hole of the drying device is connected with the feed hole of the preheating device through a sixth mineral aggregate conveying device;
7) a roasting device: the discharge hole of the preheating device is connected with the feed inlet of the roasting device through a seventh mineral aggregate conveying device.
Preferably, the system further comprises:
8) and a cooling device. The discharge hole of the roasting device is connected with the feed inlet of the cooling device through an eighth mineral aggregate conveying device.
Preferably, the discharge port of the cooling device is connected to the blast furnace iron making plant through a ninth mineral aggregate conveying device.
Preferably, the system further comprises: 9) flue gas processing apparatus. And a flue gas outlet of the roasting device is connected with a flue gas inlet of the flue gas treatment device through a ninth gas conveying pipeline.
Preferably, the batching device comprises a storage bin, vibration hoppers and a feeding machine, wherein the storage bin comprises a waste incineration fly ash bin and a metallurgical dust bin, the two vibration hoppers are respectively arranged below respective discharge ports of the waste incineration fly ash bin and the metallurgical dust bin, and the feeding machine is arranged below the discharge ports of the vibration hoppers; the discharge port of the feeder is connected with the feed port of the mixing device through the first mineral aggregate conveying device.
Preferably, the mixing device comprises a digester and an intensive mixer. The discharge port of the feeder is connected with the feed inlet of the digester through the first mineral aggregate conveying device, the discharge port of the digester is connected with the feed inlet of the intensive mixer through the second mineral aggregate conveying device, and the discharge port of the intensive mixer is connected with the feed inlet of the moistening and grinding machine through the third mineral aggregate conveying device.
Preferably, the drying device comprises an air-blast drying section and an air-draft drying section. The forced air drying section is arranged upstream of the induced draft drying section in the direction of travel of the fly ash and dust.
Preferably, the cooling device comprises a high-temperature cooling section, a medium-temperature cooling section and a low-temperature cooling section. The high-temperature cooling section, the medium-temperature cooling section and the low-temperature cooling section are sequentially arranged along the running direction of the fly ash and the dust.
Preferably, the flue gas treatment device comprises a first stage spray and a second stage spray. The first section spraying and the second section spraying are sequentially arranged along the direction of flue gas discharged by the roasting device. Alternatively, preferably, the flue gas treatment device comprises a porous membrane dust collector; more preferably, the porous dust collector is a flexible dust collector or a ceramic dust collector. Preferably, the flexible membrane is an intermetallic flexible membrane. The porous film dust collector is a corrosion-resistant, oxidation-resistant, heat vibration-resistant, wear-resistant and anti-clogging film dust collector.
Preferably, the flue gas treatment device is a dry flue gas treatment device, and the device comprises high-temperature section recovery equipment, medium-temperature section recovery equipment and low-temperature section recovery equipment; along the direction of the flue gas discharged by the roasting device (or along the direction of the flue gas discharged by the roasting device running in the flue gas treatment device), the high-temperature section recovery equipment, the medium-temperature section recovery equipment and the low-temperature section recovery equipment are sequentially arranged.
In the invention, the flue gas outlet of the second stage of spraying is connected to the chimney through a tenth gas conveying pipeline.
Optionally, a defogging device and/or an anticorrosion fan and/or a purification device are/is sequentially arranged on the tenth gas transmission pipeline.
In the present invention, the flue gas outlet of the low temperature stage recovery apparatus is connected to the stack through a tenth gas conveying pipe. Optionally, a dust remover and/or an anticorrosive fan and/or a purification device are/is sequentially arranged on the tenth gas conveying pipeline. Preferably, the dust collector is a porous film dust collector.
Preferably, the system further comprises: the liquid outlet of the first section of spraying is connected with the filtering device through a first liquid conveying device. The filter device comprises a liquid outlet and a solid outlet, and the liquid outlet of the filter device is connected with the filter pressing device through a fourth liquid conveying device.
Preferably, the liquid outlet of the second stage spraying is connected to the acid-base neutralization device through a second liquid conveying device.
Preferably, the solid outlet of the filter device and the solid outlet of the filter press device are conveyed to the valuable metal recovery device by a tenth mineral aggregate conveying device.
Preferably, the recovery outlet of the high-temperature recovery equipment is connected with a copper recovery device, the recovery outlet of the medium-temperature recovery equipment is connected with a lead recovery device, and the recovery outlet of the low-temperature recovery equipment is connected with a zinc recovery device. Preferably, the dust outlet of the dust separator is connected to the feed inlet of the intensive mixer by means of a dust conveying device.
In the present invention, the digester is provided with a chloride inlet. And an additive inlet is arranged on the moistening and grinding machine. And a hydrochloric acid inlet is arranged on the first section of spraying. And a water inlet is arranged on the second section of spraying. And the acid-base neutralization device is provided with a base inlet.
In the invention, the roasting device is provided with a coal powder inlet and/or a fuel gas inlet.
In the present invention, the system further comprises: air is delivered to the air inlet of the cooling device through a first gas delivery duct. Preferably, the air is independently delivered to the air inlets of the high-temperature cooling section, the medium-temperature cooling section and the low-temperature cooling section through the first gas delivery pipeline. And a gas outlet of the high-temperature cooling section is connected to a gas inlet of the preheating device through a second gas conveying pipeline. And a gas outlet of the medium-temperature cooling section is connected to a gas inlet of the air draft drying section through a third gas conveying pipeline. The gas outlet of the low-temperature cooling section is connected to the gas inlet of the forced air drying section through a fourth gas conveying pipeline. And a gas outlet of the preheating device is connected with a fifth gas conveying pipeline. And a gas outlet of the air draft drying section is connected with a sixth gas conveying pipeline. And the body outlet of the blowing and drying section is connected with a seventh gas conveying pipeline. And the fifth gas conveying pipeline, the sixth gas conveying pipeline and the seventh gas conveying pipeline are combined and then connected to a gas inlet of the roasting device through an eighth gas conveying pipeline. A flue gas outlet of the roasting device is connected with a flue gas inlet of the first section of spraying or a flue gas inlet of the high-temperature section of recovery equipment through a ninth gas conveying pipeline;
preferably, the flue gas outlet of the roasting device and the feed inlet of the roasting device are arranged on the same side of the roasting device, and the gas inlet of the roasting device and the discharge outlet of the roasting device are arranged on the same side of the roasting device. More preferably, the flue gas outlet of the roasting device is overlapped with the feed inlet of the roasting device, and the gas inlet of the roasting device is overlapped with the discharge outlet of the roasting device.
Preferably, the discharge port of the acid-base neutralization device is connected to the chloride inlet through a third liquid conveying device. The hydrochloric acid inlet of the first section of spraying is connected with a hydrochloric acid conveying device. And a water inlet of the second-stage spraying device is connected with a water conveying device. And a liquid outlet of the filter pressing device is connected to the hydrochloric acid conveying device or the hydrochloric acid inlet of the first section of spraying through a fifth liquid conveying device.
In the invention, the first air delivery pipeline is provided with a first air blower. And a second air blower is arranged on the fourth gas conveying pipeline. An exhaust fan is arranged on the sixth gas conveying pipeline.
Preferably, the system further comprises an air delivery conduit. Air is delivered to the eighth gas delivery duct or the gas inlet of the roasting apparatus through the air delivery duct.
Preferably, the vibrating hopper is a vibrating funnel. The feeder is a constant feeder. The digester is a multi-stage digester, preferably a two-stage digester or a three-stage digester. The pelletizer is a disc pelletizer. The drying device is a trolley with grid bars. The preheating device is arranged on the chain grate. The roasting device is one of a shaft furnace, a rotary hearth furnace, a ring type roasting machine, a rotary kiln or a belt type roasting machine. The flue gas treatment device is an anti-corrosion flue gas treatment device.
According to another embodiment provided by the invention, a process for the cooperative resource utilization of municipal and metallurgical difficultly-treated solid wastes is provided.
A municipal and metallurgical difficult-to-treat solid waste is utilized as a resource in a synergic manner, and the process comprises the following steps:
1) preparing materials: conveying the waste incineration fly ash in the waste incineration fly ash bin and the metallurgical dust in the metallurgical dust bin to a mixing device through a first mineral aggregate conveying device;
2) mixing: mixing the waste incineration fly ash and the metallurgical dust in a mixing device, and uniformly mixing to obtain mixed powder;
3) and (3) moistening and grinding: conveying the mixed powder to a moistening and grinding machine through a third mineral aggregate conveying device for moistening and grinding, and mixing the moistened and ground mixed powder;
4) pelletizing: conveying the mixed powder subjected to the wet grinding to a pelletizer through a fourth mineral aggregate conveying device for pelleting to obtain powder pellets;
5) and (3) drying: conveying the powder pellets to a drying device through a fifth mineral aggregate conveying device for drying to obtain dried powder pellets;
6) preheating: conveying the dried powder pellets to a preheating device through a sixth mineral aggregate conveying device for preheating, so as to improve the temperature and strength of the powder pellets and obtain the preheated powder pellets;
7) roasting: and conveying the preheated powder pellets to a roasting device through a seventh mineral aggregate conveying device for high-temperature chlorination roasting.
Preferably, the process further comprises:
8) and (3) cooling: and conveying the powder pellets subjected to high-temperature chlorination roasting to a cooling device through an eighth mineral aggregate conveying device for cooling. Preferably, the cooled powder pellets are conveyed to a blast furnace ironmaking workshop for ironmaking through a ninth mineral aggregate conveying device.
Preferably, the mixing device comprises a digester and an intensive mixer. The powder is conveyed to the digester through a discharge port of the feeder through the first mineral aggregate conveying device for digestion and mixing, and then the powder subjected to digestion and mixing is conveyed to the powerful mixer through the second mineral aggregate conveying device for powerful mixing to obtain mixed powder.
In the step 1), the waste incineration fly ash in the waste incineration fly ash bin and the metallurgical dust in the metallurgical dust bin are transferred to a feeder through (two) vibration hoppers respectively, and then are conveyed to a mixing device through a first mineral aggregate conveying device.
Preferably, the drying device comprises an air-blast drying section and an air-draft drying section. And conveying the powder pellets to a blast drying section through a fifth mineral aggregate conveying device for drying, and then drying through an air draft drying section to obtain dried powder pellets.
Preferably, the cooling device comprises a high-temperature cooling section, a medium-temperature cooling section and a low-temperature cooling section. And conveying the powder pellets subjected to high-temperature chlorination roasting to a cooling device through an eighth mineral aggregate conveying device, and cooling the powder pellets sequentially through a high-temperature cooling section, a medium-temperature cooling section and a low-temperature cooling section.
In the present invention, air is delivered to the air inlet of the cooling device through the first gas delivery duct. Preferably, the air is independently delivered to the air inlets of the high-temperature cooling section, the medium-temperature cooling section and the low-temperature cooling section through the first gas delivery pipeline.
In the invention, after the air exchanges heat with the powdery pellets after high-temperature chlorination roasting in the cooling device, the gas in the high-temperature cooling section is conveyed to the preheating device through the second gas conveying pipeline for heating the materials, the gas in the high-temperature cooling section exchanges heat with the powdery pellets in the preheating device, and the gas after heat exchange is connected to the fifth gas conveying pipeline. The gas of the medium temperature cooling section is conveyed to a gas inlet of the air draft drying section through a third gas conveying pipeline to dry the materials, the gas of the medium temperature cooling section exchanges heat with the powder pellets in the air draft drying section, and the gas after heat exchange is connected to a sixth gas conveying pipeline. The gas of low-temperature cooling section is conveyed to the gas inlet of the forced air drying section through the fourth gas conveying pipeline to carry out primary drying on the materials, the gas of the low-temperature cooling section exchanges heat with the powder pellets in the forced air drying section, and the gas after heat exchange is connected to the seventh gas conveying pipeline. And combining the gases in the fifth gas conveying pipeline, the sixth gas conveying pipeline and the seventh gas conveying pipeline, and conveying the combined gases to a gas inlet of the roasting device through an eighth gas conveying pipeline, wherein the gases are roasted in the roasting device.
Preferably, the process further comprises:
9) flue gas treatment: and gas discharged by the roasting device is conveyed to a flue gas treatment device through a ninth gas conveying pipeline for flue gas treatment, and the flue gas treated by the flue gas treatment device is conveyed to a chimney through a tenth gas conveying pipeline for emission.
Preferably, the flue gas treatment device comprises a first stage spray and a second stage spray. And gas discharged by the roasting device is conveyed to a flue gas treatment device through a ninth gas conveying pipeline, and is subjected to flue gas treatment sequentially through first section spraying and second section spraying.
Preferably, the flue gas treatment device comprises a porous membrane dust collector; more preferably, the porous dust collector is a flexible dust collector or a ceramic dust collector.
Preferably, the flue gas treatment device comprises a high-temperature section recovery device, a medium-temperature section recovery device and a low-temperature section recovery device; and gas discharged by the roasting device is conveyed to the flue gas treatment device through a ninth gas conveying pipeline and is subjected to flue gas treatment sequentially through the high-temperature section recovery equipment, the medium-temperature section recovery equipment and the low-temperature section recovery equipment.
Preferably, the flue gas treated by the flue gas treatment device is sequentially subjected to demisting and/or anticorrosive fan and/or purification by a demisting device on a tenth gas conveying pipeline, and then is conveyed to a chimney for emission.
Preferably, the flue gas treated by the flue gas treatment device is sequentially subjected to flue gas purification by a dust remover and/or an anticorrosive fan and/or a purification device on a tenth gas conveying pipeline, and then is conveyed to a chimney for emission.
In the invention, in the first stage of spraying, hydrochloric acid is adopted to spray the flue gas entering the first stage of spraying, and the cleaning solution is obtained after spraying. The washing liquid is conveyed to the filtering device through the first liquid conveying device to be filtered, and filtering filtrate and filtering solids are obtained. And conveying the filtered filtrate to a filter pressing device through a fourth liquid conveying device for filter pressing to obtain filter pressing filtrate and a filter cake.
Preferably, the filter-pressing filtrate is conveyed to the hydrochloric acid inlet of the first stage spraying through a fifth liquid conveying device.
In the invention, in the second stage of spraying, water is adopted to spray the flue gas entering the second stage of spraying. And (3) completely absorbing hydrogen chloride gas in the flue gas by water, and conveying the obtained solution to an acid-base neutralization device for neutralization through a second liquid conveying device.
Preferably, the chloride obtained after neutralization is transported to the chloride inlet of the digester by a third liquid transfer means.
In the present invention, the process further comprises:
10) recovering valuable metals: and conveying the filtered solid and the filter cake to a valuable metal recovery device through a tenth mineral aggregate conveying device for valuable metal recovery.
Preferably, the copper chloride obtained by the recovery of the high-temperature section recovery equipment is conveyed to the copper recovery device from the recovery outlet of the high-temperature section recovery equipment, the lead chloride obtained by the recovery of the medium-temperature section recovery equipment is conveyed to the lead recovery device from the recovery outlet of the medium-temperature section recovery equipment, and the zinc chloride obtained by the recovery of the low-temperature section recovery equipment is conveyed to the zinc recovery device from the recovery outlet of the low-temperature section recovery equipment. Preferably, the dust outlet of the dust separator is connected to the feed inlet of the intensive mixer by means of a dust conveying device.
In the present invention, the digester is provided with a chloride inlet. When the powder is conveyed to a digester through a discharge port of the feeder by a first mineral aggregate conveying device for digestion and mixing, chloride is added or sprayed from a chloride inlet. Preferably, the chloride is a calcium chloride solution.
In the invention, the moistening and grinding machine is provided with an additive inlet. And (3) when the mixed powder is conveyed to the moistening and grinding machine through the third mineral aggregate conveying device for moistening and grinding, adding the additive from the additive inlet. Preferably, the additive is bentonite.
In the invention, the acid-base neutralization device is provided with a base inlet. When the obtained solution is conveyed to the acid-base neutralization device through the second liquid conveying device for neutralization, the alkali is added from the alkali inlet. Preferably, the base is a calcium hydroxide solution.
Preferably, the first gas conveying pipeline is provided with a first air blower, and the cooling device adopts air blast cooling. And a second air blower is arranged on the fourth gas conveying pipeline, and the air blowing drying section adopts air blowing drying. And an exhaust fan is arranged on the sixth gas conveying pipeline, and the exhaust drying section adopts exhaust drying.
Preferably, the roasting device is provided with a coal powder inlet and/or a fuel gas inlet, and the preheated powder pellets are sprayed into the roasting device when the roasting device is used for high-temperature chlorination roasting.
Preferably, the flue gas outlet of the roasting device and the feed inlet of the roasting device are arranged on the same side of the roasting device, the gas inlet of the roasting device and the discharge outlet of the roasting device are arranged on the same side of the roasting device, and the flue gas and the material flow are opposite. More preferably, the flue gas outlet of the roasting device is overlapped with the feed inlet of the roasting device, and the gas inlet of the roasting device is overlapped with the discharge outlet of the roasting device. Preferably, the inside of the baking apparatus is controlled to a weakly reducing atmosphere. The control of the weak reducing atmosphere in the roasting device is realized by the following modes: spraying coal powder into the roasting device. The coal powder can be used as fuel for combustion, and carbon monoxide generated by the coal powder has reducibility, and the roasting atmosphere is weak reducing atmosphere. The coal dust is added at the beginning of the batching, and the reason for adding the coal dust at the moment is to better control the reducing atmosphere and avoid the excess or deficiency of the coal dust.
Preferably, the system further comprises an air delivery duct through which air is delivered to the eighth gas delivery duct or the gas inlet of the roasting apparatus.
In the present invention, when the mixed powder is subjected to the wet milling in step 3), an additive is added, and the weight of the additive is 0.1 to 8% of the weight of the mixed powder, preferably 0.3 to 6%, more preferably 0.5 to 4%, and further preferably 0.8 to 2%.
In the present invention, the diameter of the powder pellets obtained by granulation in step 4) is 3 to 30mm, preferably 5 to 25mm, more preferably 6 to 20mm, and still more preferably 8 to 12 mm.
In the invention, in the step 7), the temperature of the powder pellets entering the roasting device is 300-. The temperature in the baking device is 1000-1600 ℃, preferably 1100-1500 ℃, more preferably 1150-1400 ℃, and further preferably 1200-1300 ℃. The time for the roasting device to perform high-temperature chlorination roasting on the powder pellets is 0.2-5h, preferably 0.5-4h, more preferably 0.8-3h, and further preferably 1-2 h.
In the invention, the following system and process are mainly adopted:
the batching system comprises a garbage fly ash bin and a steel metallurgy dust bin, wherein a vibration funnel (for preventing bin bottom from being blocked and fed) is arranged below each bin, and a quantitative feeder is arranged below each vibration funnel and used for metering the proportion of each material;
a mixing system comprising two stages of mixing, the first stage being primary moistening mixing, delivering the proportioned material to a secondary or tertiary digester (the digesters in patent ZL 201620521055 and ZL201620518434 of the inventor of the present application), in which a calcium chloride-containing solution is sprayed (the calcium chloride content decreases with increasing proportion of fly ash); and the second stage is strong mixing, and the materials after being mixed are sent to a strong mixer for strong mixing, so that the materials are fully and uniformly mixed.
And (3) a moistening and grinding machine, namely feeding the fully and uniformly mixed materials into the moistening and grinding machine for moistening and grinding, and adding an additive (preferably bentonite, wherein the addition amount is 1-2%) to improve the balling property and the green balling property of the mixture.
And (3) a disc pelletizer, wherein the mixture after the wet grinding is prepared into small balls (pellets) with the diameter of 8-12mm in the disc pelletizer.
The drying system comprises two sections of drying, wherein the first section is blast drying, small ball materials are flatly arranged on a trolley with grid bars, and the small ball materials are blast dried to the trolley (the blast can be natural wind or hot wind); the second section is air draft drying, hot air is introduced above the trolley and is exhausted from the bottom of the trolley, and the hot air further dries the small ball materials through the material layer.
And the preheating device (preferably a chain grate) is used for sending the two sections of dried pellets into the preheating device for preheating by spraying combustion gas, so that the temperature and the strength of the pellets are improved.
The preheated pellets are sent to the roasting device, coal powder is sprayed into the device, the pellets are roasted by spraying combustion gas, the generated flue gas is discharged from the material inlet end of the roasting device, the flue gas is against the material flow, and the roasted pellets are discharged from the material outlet end of the roasting device. The roasting device is controlled to be in a weak reducing atmosphere, the temperature of a feed end is about 600 ℃, the temperature of a high-temperature section is 1200-1300 ℃, the retention time of pellets in the roasting device is about 1-2 hours, the process is chloridizing roasting, and zinc, lead, potassium, sodium and the like in the raw materials are reacted with chlorine through the high chlorine content in the pellets to be combined and volatilized and enriched into flue gas.
And the cooling system cools the material discharged from the outlet end of the pellet roasting device after chlorination roasting on the cooling device, performs blast cooling, and is divided into a high-temperature section, a medium-temperature section and a low-temperature section along with the moving direction of the pellets on the cooling device. The cooling gas passing through the high-temperature section with the highest temperature is introduced into a preheating device for supporting combustion and heating materials; cooling gas passing through the medium-temperature section, with higher temperature, is introduced into a second section drying zone in the drying system to dry the material; the cooling gas passing through the low-temperature section with lower temperature is introduced into a first section drying area in a drying system to carry out primary drying on the materials. The iron-containing material with low content of heavy (alkali) metal and chlorine is obtained after cooling, and the material can be directly sent into a blast furnace for iron making.
The flue gas generated by chloridizing roasting contains a large amount of chlorinated metal substances and has certain corrosivity, the flue gas is introduced into an anticorrosive device, the flue gas is sprayed for the first period (spraying liquid is dilute hydrochloric acid), and the obtained washing liquid is filtered to obtain smoke dust and part of recovered valuable metals; the flue gas after the first-stage spraying is subjected to second-stage spraying (the spraying liquid is water), hydrogen chloride gas in the flue gas is completely absorbed by the water, and the obtained solution is neutralized by calcium hydroxide to obtain a solution containing calcium chloride, and the solution can be used in a mixing system; and the flue gas sprayed by the second section passes through a demister, is discharged into a purification tower through an anticorrosive fan, and is discharged out through a chimney, and the flue gas emission reaches the standard. And filtering the washing liquid obtained by the first stage spraying, and then performing filter pressing to obtain a filter cake and a filtrate, wherein the filtrate can be used as a supplement for the first stage spraying, and the filter cake and the washing liquid are filtered to obtain smoke dust which is used as a high-content raw material of valuable metals (such as lead, zinc and the like) to recover the valuable metals.
In the invention, the flue gas treatment system (or the flue gas treatment device) can adopt a wet flue gas treatment device or a dry flue gas treatment device. The flue gas is cooled gradually in the dry method flue gas treatment device, and as the flue gas contains chlorides of various nonferrous metals and the condensation points of the chlorides of the various nonferrous metals are different, the chlorides of the nonferrous metals with high condensation point (high temperature) can be changed into liquid at the high-temperature section recovery equipment of the flue gas treatment device along with the cooling of the flue gas in the device, and the liquid is discharged from the recovery outlet of the high-temperature section recovery equipment; the chloride of nonferrous metal with the second condensation point (the second temperature) can be changed into liquid at the middle-temperature section recovery equipment of the flue gas treatment device and is discharged from the recovery outlet of the middle-temperature section recovery equipment; the chlorides of nonferrous metals with low condensation point (low temperature) can be changed into liquid at the low-temperature section recovery equipment of the flue gas treatment device and are discharged from the recovery outlet of the low-temperature section recovery equipment. Generally, the main chlorides of nonferrous metals in the flue gas are copper chloride, lead chloride and zinc chloride, and according to condensation points of the three chlorides, the copper chloride can be changed into liquid at a high-temperature section recovery device, is discharged from a recovery outlet of the high-temperature section recovery device and then is conveyed to a copper recovery device; the lead chloride can be changed into liquid at the middle-temperature section recovery equipment, is discharged from a recovery outlet of the middle-temperature section recovery equipment and is conveyed to a lead recovery device; the zinc chloride can be changed into liquid at the low-temperature section recovery equipment, is discharged from a recovery outlet of the low-temperature section recovery equipment and then is conveyed to a zinc recovery device.
In the present invention, the "connection" of the outlet of one device to the inlet of the other device means the manner of material transfer achieved by the two ends of the conveying device (e.g. conveyor or pipe). For example, material discharged from the discharge port of one device is conveyed by the conveying device to (into) the feed port of another device. Delivery devices described herein include, but are not limited to: a conveyor or a pipe.
In the invention, the flue gas treatment device comprises a spraying device, a filtering device and a filter pressing device, wherein the spraying device comprises a first section of spraying and a second section of spraying. And (3) filtering the filtrate sprayed by the first section by a filtering device to obtain filtered filtrate and filtered solids, performing filter pressing on the filtered filtrate to obtain filter-pressing filtrate and filter cakes, and conveying the filter-pressing filtrate to the first section for spraying to be used as spraying liquid for recycling. The filtered solid and the filter cake can be conveyed to a valuable metal recovery device to further recover valuable metals, so that the fly ash and the dust are treated more thoroughly, and simultaneously, the metals (such as lead, zinc, alkali metals and the like) of organic matters are recovered, and in addition, the discharge of solid wastes and the pollution of the metals in the solid wastes to the environment can be reduced. The main component of the washing liquid sprayed by the second section is hydrochloric acid, the washing liquid generates calcium chloride after passing through an acid-base neutralization device, and the generated calcium chloride is conveyed to a digester to be used as digestive juice for recycling.
In the invention, if a dry flue gas treatment device is adopted, nonferrous metals such as copper, lead, zinc and the like can be directly recovered. Meanwhile, the treated flue gas enters a dust remover for dust removal, and dust is discharged from a dust outlet of the dust remover and conveyed to a powerful mixer to be recycled as a raw material; on one hand, the method can enrich nonferrous metals in dust and increase the recovery rate; on the other hand, the content of nonferrous metal in the discharged flue gas is reduced, and the environment is protected.
In the invention, if a dry-method flue gas treatment device is adopted, no special requirements are required on the device, and only the flue gas can be gradually cooled. For example, a shell-and-tube heat exchanger can be used for treating flue gas, the flue gas passes through a shell pass, a cooling medium (such as water, air, nitrogen and the like) passes through a tube pass, the whole shell-and-tube heat exchanger is divided into three sections, namely a high-temperature section recovery device (namely a high-temperature recovery section), a medium-temperature section recovery device (namely a medium-temperature recovery section) and a low-temperature section recovery device (namely a low-temperature recovery section), and recovery outlets are respectively arranged on the shell passes of the three sections and used for recovering chlorides condensed in the sections; for example, the high-temperature recovery section recovers copper chloride, the medium-temperature recovery section recovers lead chloride, and the low-temperature recovery section recovers zinc chloride. According to the specific process, the whole shell-and-tube heat exchange equipment can also be divided into one section or a plurality of sections, and the sections are distinguished according to the components or the types of the nonferrous metal chlorides in the flue gas.
In the invention, the mixing device adopts the combination of the digester and the powerful mixer, so that the waste incineration fly ash and the ferrous metallurgy dust can be fully and uniformly mixed, and meanwhile, the waste incineration fly ash and the ferrous metallurgy dust can be thoroughly digested by adopting the treatment of the digester, the subsequent reaction speed of the waste incineration fly ash and the ferrous metallurgy dust is accelerated, and the reaction of the waste incineration fly ash and the ferrous metallurgy dust is more thorough.
In the invention, the drying device comprises a blast drying section and an air draft drying section, two sections of drying are adopted, the blast drying section adopts blast drying for primary drying, the air draft drying section adopts air draft drying for further drying, and the mixture of the waste incineration fly ash and the ferrous metallurgy dust is fully dried.
In the invention, the cooling device comprises a high-temperature cooling section, a medium-temperature cooling section and a low-temperature cooling section. The cooling device cools the powder pellets, and simultaneously gas in the high-temperature cooling section is conveyed to the preheating device through the second gas conveying pipeline for heating materials, and the gas in the medium-temperature cooling section exchanges heat with the powder pellets in the air draft drying section; the gas in the low-temperature cooling section exchanges heat with the powder pellets in the forced air drying section; the design can make full use of heat energy, and the gas after heat exchange is conveyed to the roasting device, so that the temperature of combustion-supporting gas in the roasting device is increased, and the working efficiency of the roasting device is improved.
In the invention, after the powder pellets after passing through the cooling device are cooled to reach the required temperature, the powder pellets are conveyed to a blast furnace ironmaking workshop for ironmaking through a ninth mineral aggregate conveying device. After the impurities such as chlorine and valuable metals in the raw materials (waste incineration fly ash and metallurgical dust) pass through the roasting device, most of the impurities such as chlorine and valuable metals are taken away by the flue gas and enter the flue gas treatment system or the flue gas treatment device, the main component in the powder pellets after passing through the cooling device is iron, the impurities are few, and the raw materials are actually low-impurity iron-containing raw materials and can be directly conveyed to a blast furnace iron-making workshop for iron making.
In the invention, the direction along which the fly ash and the dust run refers to the direction in which the powder material pellets are conveyed to the cooling device after being chloridized and roasted at high temperature in the roasting device. The high-temperature cooling section, the medium-temperature cooling section and the low-temperature cooling section are sequentially arranged along the running direction of the fly ash and the dust; that is to say, the high temperature cooling section is close to the inlet of the whole cooling device powder pellet, the low temperature cooling section is close to the outlet of the whole cooling device powder pellet, and the medium temperature cooling section is located between the high temperature cooling section and the low temperature cooling section.
In the present invention, the direction along which the flue gas is discharged from the roasting apparatus refers to the direction of flow of the flue gas in the flue gas treatment apparatus. Along the direction of flue gas discharged by the roasting device, the first section of spraying and the second section of spraying are sequentially arranged, namely, the first section of spraying is arranged at the position close to the flue gas inlet of the whole flue gas treatment device, and the second section of spraying is arranged at the position close to the flue gas outlet of the whole flue gas treatment device; the flue gas discharged by the roasting device is firstly sprayed through the first section and then sprayed through the second section.
In the invention, the flue gas outlet of the roasting device and the feed inlet of the roasting device are arranged on the same side of the roasting device, which means that the flue gas outlet of the roasting device and the feed inlet of the roasting device are arranged on the same surface of the roasting device; the gas inlet of the roasting device and the discharge hole of the roasting device are arranged on the same side of the roasting device, which means that the gas inlet of the roasting device and the discharge hole of the roasting device are arranged on the same surface of the roasting device; therefore, convection of smoke and materials can be realized, and the roasting effect and the working efficiency of the roasting device are improved. Generally, the flue gas outlet of the roasting device and the inlet of the roasting device are arranged on the surface of the roasting device, and the gas inlet of the roasting device and the outlet of the roasting device are arranged on the surface of the roasting device at opposite positions, for example, the flue gas outlet of the roasting device and the inlet of the roasting device are arranged at the leftmost end (or the frontmost end) of the roasting device, and the gas inlet of the roasting device and the outlet of the roasting device are arranged at the rightmost end (or the rearmost end) of the roasting device.
In the invention, the use amount of the waste incineration fly ash and the ferrous metallurgy dust is determined according to the actual process and the content of each component in the waste incineration fly ash and the ferrous metallurgy dust, including the content determination of dioxin, heavy metal, chlorine and the like.
In the present invention, the amount and concentration of the chloride (e.g., calcium chloride) are not limited as long as they can function as a digestive juice, and can be determined according to the actual process. Generally, the amount and concentration of chloride (e.g., calcium chloride) decreases as the proportion of fly ash increases.
In the invention, the dosage and concentration of the hydrogen chloride in the first stage of spraying are not limited as long as the heavy metals (or valuable metals, such as lead, zinc and alkali metals) in the flue gas can be sufficiently washed, and the dosage and concentration can be determined according to the actual process. The amount of the reclaimed water in the second stage of spraying is not limited, so long as the reclaimed water can fully wash the hydrogen chloride in the flue gas after the first stage of spraying, and the method can be determined according to the actual process.
In the invention, the dosage and concentration of the alkali (calcium hydroxide solution) added in the acid-base neutralization device are not limited, as long as the hydrogen chloride in the second section of spraying washing liquid can be neutralized, and the dosage and concentration can be determined according to the actual process.
In the invention, the purification device plays a role in treating the flue gas, removes the pollution components in the flue gas and reaches the emission standard. Generally, the purification apparatus includes a desulfurization and denitrification apparatus; preferably, the desulfurization device is an activated carbon desulfurization device (for example, an activated carbon flue gas purification device ZL201520901540.7 granted by the unit of the applicant).
In the present invention, the pelletizer is a disc pelletizer or a cylindrical pelletizer.
In the invention, the mineral material conveying device (including the first mineral material conveying device, the second mineral material conveying device, the third mineral material conveying device, the fourth mineral material conveying device, the fifth mineral material conveying device, the sixth mineral material conveying device, the seventh mineral material conveying device, the eighth mineral material conveying device, the ninth mineral material conveying device, the tenth mineral material conveying device and the dust conveying device) can be one of a belt conveyor, a bucket conveyor, a drum conveyor or a plate chain conveyor independently.
In the present invention, optionally, is meant to mean either go or not go, select or not, set or not.
In the present invention, the components and devices not described are all well known to those skilled in the art.
Compared with the prior art, the invention has the following beneficial technical effects:
1. the environmental and social problems caused by difficult disposal of the metallurgical dust containing heavy metals such as zinc, lead and the like in steel plants are solved;
2. the effective chlorine element of the fly ash is fully utilized for chloridizing roasting, so that the resource utilization and harmless disposal of the fly ash are realized;
3. the method removes harmful elements such as zinc, lead, potassium, sodium and the like in the zinc-containing metallurgical dust, and the obtained product can be used as an iron-making production raw material;
4. non-ferrous metals such as zinc, lead and the like can be recovered, and the resource recovery rate is increased;
5. the flue gas is recycled, and energy conservation and emission reduction are realized.
Drawings
FIG. 1 is a schematic structural diagram of a municipal and metallurgical difficult-to-treat solid waste cooperative resource utilization system of the invention;
FIG. 2 is a schematic view of the pipeline connection of the municipal and metallurgical difficult-to-treat solid waste cooperative resource utilization system of the invention;
FIG. 3 is a schematic structural view of another flue gas treatment device of the municipal and metallurgical difficult-to-treat solid waste cooperative resource utilization system of the invention;
FIG. 4 is a process diagram using the system of the present invention;
FIG. 5 is a process flow diagram of the system of the present invention;
FIG. 6 is a schematic flow diagram of a flue gas treatment device in the system of the present invention;
FIG. 7 is a schematic flow diagram of another flue gas treatment device in the system of the present invention.
Reference numerals:
1: a storage bin; 101: a refuse incineration fly ash bin; 102: a metallurgical dust bin; 2: vibrating the bucket; 3: a feeder; 4: a mixing device; 401: a digester; 40101: a chloride inlet; 402: a powerful mixer; 5: a moistening and grinding machine; 501: an additive inlet; 6: pelletizing; 7: a drying device; 701: a forced air drying section; 702: an air draft drying section; 8: a preheating device; 9: a roasting device; 901: a pulverized coal inlet; 902: a gas inlet; 10: a cooling device; 1001: a high temperature cooling section; 1002: a medium temperature cooling section; 1003: a low temperature cooling section; 11: a flue gas treatment device; 1101: spraying at the first stage; 1102: spraying in the second section; 1103: high temperature section recovery equipment; 1104: intermediate temperature section recovery equipment; 1105: low temperature section recovery equipment; 12: a first blower; 13: a second blower; 14: a defogging device; 15: an anti-corrosion fan; 16: a purification device; 17: a chimney; 18: an exhaust fan; 19: a filtration device; 20: an acid-base neutralization device; 2001: an alkali inlet; 21: a filter pressing device; 22: a dust remover; l1: a first gas delivery conduit; l2: a second gas delivery conduit; l3: a third gas delivery conduit; l4: a fourth gas delivery conduit; l5: a fifth gas delivery conduit; l6: a sixth gas delivery conduit; l7: a seventh gas delivery conduit; l8: an eighth gas delivery conduit; l9: a ninth gas delivery conduit; l10: a tenth gas delivery conduit; l11: an air delivery conduit; g1: a first mineral aggregate conveying device; g2: a second mineral aggregate conveying device; g3: a third mineral aggregate conveying device; g4: a fourth mineral aggregate conveying device; g5: a fifth mineral aggregate conveying device; g6: a sixth mineral aggregate conveying device; g7: a seventh mineral aggregate conveying device; g8: an eighth mineral aggregate conveying device; g9: a ninth cup of mineral aggregate conveying device; g10: a tenth cup of mineral aggregate conveying means; g11: a dust conveying device; y1: a first liquid delivery device; y2: a second liquid delivery device; y3: a third liquid delivery device; y4: a fourth liquid delivery device; y5: a fifth liquid delivery device; y6: a hydrochloric acid conveying device; y7: a water delivery device.
Detailed Description
According to the first embodiment provided by the invention, a system for the cooperative resource utilization of municipal and metallurgical refractory solid wastes is provided.
A municipal and metallurgical difficult-to-treat solid waste is system of utilization as resource in coordination, and this system includes:
1) the batching device: the batching device comprises a stock bin 1;
2) the mixing device 4: the discharge hole of the storage bin 1 is connected with the feed inlet of the mixing device 4 through a first mineral aggregate conveying device G1;
3) and (5) a moistening and grinding machine: the discharge hole of the mixing device 4 is connected with the feed hole of the moistening and grinding machine 5 through a third mineral aggregate conveying device G3;
4) and (6) pelletizing: the discharge hole of the moistening and grinding machine 5 is connected with the feed hole of the pelletizer 6 through a fourth mineral aggregate conveying device G4;
5) the drying device 7: the discharge hole of the pelletizer 6 is connected with the feed hole of the drying device 7 through a fifth mineral aggregate conveying device G5;
6) the preheating device 8: the discharge hole of the drying device 7 is connected with the feed hole of the preheating device 8 through a sixth mineral aggregate conveying device G6;
7) a roasting device 9: the discharge hole of the preheating device 8 is connected with the feed hole of the roasting device 9 through a seventh mineral aggregate conveying device G7.
Preferably, the system further comprises:
8) a cooling device 10. The discharge port of the roasting device 9 is connected with the feed port of the cooling device 10 through an eighth mineral aggregate conveying device G8.
Preferably, the discharge port of the cooling device 10 is connected to the blast furnace iron making plant through a ninth mineral aggregate feeding device G9.
Preferably, the system further comprises: 9) flue gas treatment device 11. The flue gas outlet of the roasting device 9 is connected with the flue gas inlet of the flue gas treatment device 11 through a ninth gas conveying pipeline L9.
Preferably, the batching device comprises a storage bin 1, a vibration hopper 2 and a feeder 3, wherein the storage bin 1 comprises a waste incineration fly ash bin 101 and a metallurgical dust bin 102, the two vibration hoppers 2 are respectively arranged below respective discharge ports of the waste incineration fly ash bin 101 and the metallurgical dust bin 102, and the feeder 3 is arranged below the discharge ports of the vibration hoppers 2; the discharge port of the feeder 3 is connected with the feed port of the mixing device 4 through a first mineral aggregate conveying device G1.
Preferably, the mixing device 4 comprises a digester 401 and an intensive mixer 402. The discharge port of the feeder 3 is connected with the feed port of the digester 401 through a first mineral material conveying device G1, the discharge port of the digester 401 is connected with the feed port of the intensive mixer 402 through a second mineral material conveying device G2, and the discharge port of the intensive mixer 402 is connected with the feed port of the moistening and grinding machine 5 through a third mineral material conveying device G3.
Preferably, the drying device 7 comprises an air blast drying section 701 and an air draft drying section 702. The forced air drying section 701 is disposed upstream of the suction drying section 702 in the direction of travel of the fly ash and dust.
Preferably, the cooling apparatus 10 includes a high-temperature cooling section 1001, a medium-temperature cooling section 1002, and a low-temperature cooling section 1003. Along the running direction of fly ash and dust, a high-temperature cooling section 1001, a medium-temperature cooling section 1002 and a low-temperature cooling section 1003 are arranged in sequence.
Preferably, the flue gas treatment device 11 comprises a first stage spray 1101 and a second stage spray 1102. Along the direction of flue gas discharged from the roasting device 9, a first stage spraying 1101 and a second stage spraying 1102 are arranged in sequence. Alternatively, preferably, the flue gas treatment device 11 comprises a porous membrane dust collector; more preferably, the porous dust collector is a flexible dust collector or a ceramic dust collector, such as a flexible dust collector. Preferably, the flexible membrane is an intermetallic flexible membrane. The porous film dust collector is a corrosion-resistant, oxidation-resistant, heat vibration-resistant, wear-resistant and anti-clogging film dust collector.
Preferably, the flue gas treatment device 11 comprises a high-temperature section recovery device 1103, a medium-temperature section recovery device 1104 and a low-temperature section recovery device 1105; along the direction of the flue gas discharged from the roasting device 9, a high-temperature-stage recovery unit 1103, a medium-temperature-stage recovery unit 1104, and a low-temperature-stage recovery unit 1105 are arranged in this order.
In the present invention, the flue gas outlet of the second stage spray 1102 is connected to the stack 17 through a tenth gas delivery duct L10.
Optionally, a demisting device 14 and/or an anti-corrosion fan 15 and/or a purification device 16 are sequentially arranged on the tenth gas transmission pipeline L10.
In the present invention, the flue gas outlet of the low temperature stage recovery apparatus 1105 is connected to the chimney 17 through a tenth gas conveying pipe L10; optionally, a dust remover 22 and/or an anticorrosive fan 15 and/or a purification device 16 are/is sequentially arranged on the tenth gas conveying pipeline L10; preferably, the dust separator 22 is a porous membrane dust separator.
Preferably, the system further comprises: the liquid outlet of the first stage spray 1101 is connected to the filter device 19 via a first liquid delivery device Y1. The filter device 19 comprises a liquid outlet and a solid outlet, and the liquid outlet of the filter device 19 is connected with the filter pressing device 21 through a fourth liquid conveying device Y4.
Preferably, the liquid outlet of the second stage spray 1102 is connected to the acid-base neutralization device 20 through a second liquid delivery device Y2.
Preferably, the solids outlet of the filter device 19 and the solids outlet of the filter press device 21 are conveyed to the valuable metal recovery unit by a tenth mineral aggregate conveying device G10.
Preferably, a copper recovery device is connected to a recovery outlet of the high-temperature-stage recovery device 1103, a lead recovery device is connected to a recovery outlet of the medium-temperature-stage recovery device 1104, and a zinc recovery device is connected to a recovery outlet of the low-temperature-stage recovery device 1105. Preferably, the dust outlet of the dust separator 22 is connected to the feed port of the intensive mixer 402 via a dust conveying device G11.
In the present invention, the digester 401 is provided with a chloride inlet 40101. The moistening and grinding machine 5 is provided with an additive inlet 501. The first section of spray 1101 is provided with a hydrochloric acid inlet. And a water inlet is formed in the second section spraying 1102. The acid-base neutralization device 20 is provided with a base inlet 2001.
In the present invention, the roasting device 9 is provided with a coal powder inlet 901 and/or a fuel gas inlet 902.
In the present invention, the system further comprises: the air is delivered to the air inlet of the cooling device 10 through the first gas delivery duct L1. Preferably, the air is independently supplied to the air inlets of the high-temperature cooling section 1001, the medium-temperature cooling section 1002, and the low-temperature cooling section 1003 through the first gas supply line L1. The gas outlet of the high temperature cooling section 1001 is connected to the gas inlet of the preheating device 8 through a second gas delivery pipe L2. The gas outlet of the medium temperature cooling section 1002 is connected to the gas inlet of the suction drying section 702 through a third gas conveying pipe L3. The gas outlet of the sub-cooling section 1003 is connected to the gas inlet of the forced air drying section 701 through a fourth gas transportation conduit L4. The gas outlet of the preheating device 8 is connected with a fifth gas conveying pipeline L5. The gas outlet of the extraction drying section 702 is connected with a sixth gas conveying pipeline L6. The body outlet of the forced air drying section 701 is connected with a seventh gas conveying pipeline L7. The fifth gas delivery pipe L5, the sixth gas delivery pipe L6, and the seventh gas delivery pipe L7 are combined and then connected to the gas inlet of the roasting apparatus 9 through the eighth gas delivery pipe L8. A flue gas outlet of the roasting device 9 is connected with a flue gas inlet of the first section spray 1101 or a flue gas inlet of the high-temperature section recovery equipment 1103 through a ninth gas conveying pipeline L9;
preferably, the flue gas outlet of the roasting device 9 and the feed inlet of the roasting device 9 are arranged on the same side of the roasting device 9, and the gas inlet of the roasting device 9 and the discharge outlet of the roasting device 9 are arranged on the same side of the roasting device 9. More preferably, the flue gas outlet of the roasting device 9 overlaps the feed inlet of the roasting device 9, and the gas inlet of the roasting device 9 overlaps the discharge outlet of the roasting device 9.
Preferably, the discharge port of the acid-base neutralization device 20 is connected to the chloride inlet 40101 through a third liquid delivery device Y3. The hydrochloric acid inlet of the first stage spray 1101 is connected with a hydrochloric acid conveying device Y6. The water inlet of the second stage spray 1102 is connected with a water conveying device Y7. The liquid outlet of the filter pressing device 21 is connected to the hydrochloric acid conveying device Y6 or the hydrochloric acid inlet of the first stage spray 1101 through a fifth liquid conveying device Y5.
In the present invention, the first gas delivery pipe L1 is provided with a first blower 13. The fourth gas delivery pipe L4 is provided with a second blower 12. An exhaust fan 18 is arranged on the sixth gas conveying pipeline L6.
Preferably, the system further comprises an air delivery duct L11. Air is delivered to the eighth gas delivery line L8 or the gas inlet of the roasting apparatus 9 through the air delivery line L11.
Preferably, the vibrating hopper 2 is a vibrating funnel. The feeder 3 is a constant feeder. The digester 401 is a multi-stage digester, preferably a two-stage digester or a three-stage digester. The pelletizer 6 is a disc pelletizer. The drying device 7 is a trolley with grid bars. The preheating device 8 is a chain grate. The roasting device 9 is one of a shaft furnace, a rotary hearth furnace, a ring type roasting machine, a rotary kiln or a belt type roasting machine. The flue gas treatment device 11 is an anti-corrosion flue gas treatment device.
According to another embodiment provided by the invention, a process for the cooperative resource utilization of municipal and metallurgical difficultly-treated solid wastes is provided.
A municipal and metallurgical difficult-to-treat solid waste is utilized as a resource in a synergic manner, and the process comprises the following steps:
1) preparing materials: conveying the waste incineration fly ash in the waste incineration fly ash bin 101 and the metallurgical dust in the metallurgical dust bin 102 to the mixing device 4 through a first mineral aggregate conveying device G1;
2) mixing: mixing the waste incineration fly ash and the metallurgical dust in a mixing device 4, and uniformly mixing to obtain mixed powder;
3) and (3) moistening and grinding: conveying the mixed powder to a moistening and grinding machine 5 through a third mineral aggregate conveying device G3 for moistening and grinding, and mixing the moistened and ground mixed powder;
4) pelletizing: conveying the mixed powder subjected to the wet grinding to a pelletizer 6 through a fourth mineral aggregate conveying device G4 for pelleting to obtain powder pellets;
5) and (3) drying: conveying the powder pellets to a drying device 7 through a fifth mineral aggregate conveying device G5 for drying to obtain dried powder pellets;
6) preheating: conveying the dried powder pellets to a preheating device 8 through a sixth mineral aggregate conveying device G6 for preheating, so as to improve the temperature and strength of the powder pellets and obtain the preheated powder pellets;
7) roasting: and conveying the preheated powder pellets to a roasting device 9 through a seventh mineral aggregate conveying device G7 for high-temperature chlorination roasting.
Preferably, the process further comprises:
8) and (3) cooling: and conveying the powder pellets subjected to high-temperature chlorination roasting to a cooling device 10 through an eighth mineral aggregate conveying device G8 for cooling. Preferably, the cooled powder pellets are conveyed to a blast furnace iron-making workshop for iron making through a ninth mineral aggregate conveying device G9.
In step 1), the waste incineration fly ash in the waste incineration fly ash bin 101 and the metallurgical dust in the metallurgical dust bin 102 are respectively transferred to the feeding machine 3 through the vibrating hopper 2 and then conveyed to the mixing device 4 through the first mineral aggregate conveying device G1.
Preferably, the mixing device 4 comprises a digester 401 and an intensive mixer 402. The powder is conveyed to a digester 401 through a discharge port of the feeder 3 by a first mineral aggregate conveying device G1 for digestion and mixing, and then the powder after digestion and mixing is conveyed to an intensive mixer 402 by a second mineral aggregate conveying device G2 for intensive mixing to obtain mixed powder.
Preferably, the drying device 7 comprises an air blast drying section 701 and an air draft drying section 702. And conveying the powder pellets to an air blowing drying section 701 through a fifth mineral aggregate conveying device G5 for drying, and then drying through an air draft drying section 702 to obtain dried powder pellets.
Preferably, the cooling apparatus 10 includes a high-temperature cooling section 1001, a medium-temperature cooling section 1002, and a low-temperature cooling section 1003. The powder material pellets after high-temperature chlorination roasting are conveyed to the cooling device 10 through an eighth mineral aggregate conveying device G8, and are sequentially cooled through a high-temperature cooling section 1001, a medium-temperature cooling section 1002 and a low-temperature cooling section 1003.
In the present invention, air is delivered to the air inlet of the cooling device 10 through the first gas delivery duct L1. Preferably, the air is independently supplied to the air inlets of the high-temperature cooling section 1001, the medium-temperature cooling section 1002, and the low-temperature cooling section 1003 through the first gas supply line L1.
In the invention, after the air exchanges heat with the high-temperature chloridized and roasted powder pellets in the cooling device 10, the gas in the high-temperature cooling section 1001 is conveyed to the preheating device 8 through the second gas conveying pipeline L2 for heating the materials, the gas in the high-temperature cooling section 1001 exchanges heat with the powder pellets in the preheating device 8, and the gas after heat exchange is connected to the fifth gas conveying pipeline L5. The gas of the medium temperature cooling section 1002 is conveyed to the gas inlet of the air draft drying section 702 through a third gas conveying pipeline L3 to dry the materials, the gas of the medium temperature cooling section 1002 exchanges heat with the powder pellets in the air draft drying section 702, and the gas after heat exchange is connected to a sixth gas conveying pipeline L6. The gas of the low-temperature cooling section 1003 is conveyed to a gas inlet of the blowing drying section 701 through a fourth gas conveying pipeline L4 to primarily dry the materials, the gas of the low-temperature cooling section 1003 exchanges heat with powder pellets in the blowing drying section 701, and the gas after heat exchange is connected to a seventh gas conveying pipeline L7. The combined gases in the fifth gas transfer line L5, the sixth gas transfer line L6, and the seventh gas transfer line L7 are transferred to the gas inlet of the roasting apparatus 9 through the eighth gas transfer line L8, and the combined gases are roasted in the roasting apparatus 9.
Preferably, the process further comprises:
9) flue gas treatment: the gas discharged from the roasting device 9 is conveyed to the flue gas treatment device 11 through a ninth gas conveying pipeline L9 for flue gas treatment, and the flue gas treated by the flue gas treatment device 11 is conveyed to the chimney 17 through a tenth gas conveying pipeline L10 for emission.
Preferably, the flue gas treatment device 11 comprises a first stage spray 1101 and a second stage spray 1102. The gas discharged from the roasting device 9 is conveyed to the flue gas treatment device 11 through a ninth gas conveying pipeline L9, and is subjected to flue gas treatment sequentially through a first stage spray 1101 and a second stage spray 1102.
Preferably, the flue gas treatment device 11 comprises a porous membrane dust collector; more preferably, the porous dust collector is a flexible dust collector or a ceramic dust collector.
Preferably, the flue gas treatment device 11 includes a high-temperature section recovery device 1103, a medium-temperature section recovery device 1104 and a low-temperature section recovery device 1105; the gas discharged from the roasting apparatus 9 is conveyed to the flue gas treatment apparatus 11 through a ninth gas conveying pipeline L9, and is subjected to flue gas treatment sequentially through a high-temperature-stage recovery device 1103, a medium-temperature-stage recovery device 1104, and a low-temperature-stage recovery device 1105.
Preferably, the flue gas treated by the flue gas treatment device 11 is sequentially subjected to demisting by the demisting device 14 and/or flue gas purification by the anti-corrosion fan 15 and/or the purification device 16 on the tenth gas conveying pipeline L10, and then conveyed to the chimney 17 for emission.
Preferably, the flue gas treated by the flue gas treatment device 11 is sequentially subjected to flue gas purification by the dust remover 22 and/or the anti-corrosion fan 15 and/or the purification device 16 on the tenth gas conveying pipeline L10, and then conveyed to the chimney 17 for emission.
In the invention, in the first stage spraying 1101, hydrochloric acid is adopted to spray the flue gas entering the first stage spraying 1101, and the cleaning solution is obtained after spraying. The washing liquid was transported to the filtering apparatus 19 by the first liquid transporting apparatus Y1 to be filtered, to obtain a filtered filtrate and a filtered solid. And conveying the filtered filtrate to a filter pressing device 21 through a fourth liquid conveying device Y4 for filter pressing to obtain filter pressing filtrate and a filter cake.
Preferably, the filter-pressing filtrate is conveyed to the hydrochloric acid inlet of the first stage spraying 1101 through a fifth liquid conveying device Y5.
In the present invention, in the second stage spray 1102, water is used to spray the flue gas entering the second stage spray 1102. The hydrogen chloride gas in the flue gas is completely absorbed by water, and the obtained solution is conveyed to the acid-base neutralization device 20 for neutralization through a second liquid conveying device Y2.
Preferably, the chloride obtained after neutralization is transported by a third liquid transport means Y3 to the chloride inlet 40101 of the digester 401.
In the present invention, the process further comprises:
10) recovering valuable metals: the filtered solids and the filter cake are conveyed to a valuable metal recovery unit for valuable metal recovery by a tenth mineral aggregate conveying device G10.
Or,
copper chloride obtained by recovery of the high-temperature section recovery equipment 1103 is conveyed to a copper recovery device from a recovery outlet of the high-temperature section recovery equipment 1103, lead chloride obtained by recovery of the medium-temperature section recovery equipment 1104 is conveyed to a lead recovery device from a recovery outlet of the medium-temperature section recovery equipment 1104, and zinc chloride obtained by recovery of the low-temperature section recovery equipment 1105 is conveyed to a zinc recovery device from a recovery outlet of the low-temperature section recovery equipment 1105; preferably, the dust outlet of the dust separator 22 is connected to the feed port of the intensive mixer 402 via a dust conveying device G11.
In the present invention, the digester 401 is provided with a chloride inlet 40101. When the powder is conveyed to the digester 401 through the discharge port of the feeder 3 and the first mineral aggregate conveying device G1 for digestion and mixing, chloride is added or sprayed from the chloride inlet 40101. Preferably, the chloride is a calcium chloride solution.
In the present invention, the moistening and grinding machine 5 is provided with an additive inlet 501. When the mixed powder is conveyed to the moistening and grinding machine 5 for moistening and grinding through the third mineral aggregate conveying device G3, the additive is added from the additive inlet 501. Preferably, the additive is bentonite.
In the present invention, the acid-base neutralization device 20 is provided with a base inlet 2001. When the resultant solution is transported to the acid-base neutralizing device 20 by the second liquid transporting device Y2 for neutralization, a base is added from the base inlet 2001. Preferably, the base is a calcium hydroxide solution.
Preferably, the first gas delivery pipe L1 is provided with a first blower 13, and the cooling device 10 is cooled by blowing air. A second air blower 12 is arranged on the fourth gas conveying pipeline L4, and the forced air drying section 701 adopts forced air drying. An exhaust fan 18 is arranged on the sixth gas conveying pipeline L6, and the exhaust drying section 702 adopts exhaust drying.
Preferably, the roasting device 9 is provided with a coal powder inlet 901 and/or a fuel gas inlet 902, and the preheated powdered coal pellets are sprayed into the roasting device 9 when the roasting device 9 is used for high-temperature chlorination roasting.
Preferably, the flue gas outlet of the roasting device 9 and the feed inlet of the roasting device 9 are arranged on the same side of the roasting device 9, the gas inlet of the roasting device 9 and the discharge outlet of the roasting device 9 are arranged on the same side of the roasting device 9, and the flue gas and the material flow are opposite. More preferably, the flue gas outlet of the roasting device 9 overlaps the feed inlet of the roasting device 9, and the gas inlet of the roasting device 9 overlaps the discharge outlet of the roasting device 9. Preferably, the inside of the baking apparatus 9 is controlled to a weakly reducing atmosphere. The weak reducing atmosphere is realized by the following method: spraying coal powder into the roasting device. The coal powder can be used as fuel for combustion, and carbon monoxide generated by the coal powder has reducibility, and the roasting atmosphere is weak reducing atmosphere. The reason for adding the pulverized coal is to better control the reducing atmosphere and avoid the excess or deficiency of the pulverized coal, which is different from the adding of the pulverized coal at the beginning of the batching.
Preferably, the system further comprises an air delivery duct L11, through which air is delivered to the eighth gas delivery duct L8 or the gas inlet of the roasting apparatus 9 via an air delivery duct L11.
In the present invention, when the mixed powder is subjected to the wet milling in step 3), an additive is added, and the weight of the additive is 0.1 to 8% of the weight of the mixed powder, preferably 0.3 to 6%, more preferably 0.5 to 4%, and further preferably 0.8 to 2%.
In the present invention, the diameter of the powder pellets obtained by granulation in step 4) is 3 to 30mm, preferably 5 to 25mm, more preferably 6 to 20mm, and still more preferably 8 to 12 mm.
In the invention, in the step 7), the temperature of the powder pellets entering the roasting device 9 is 300-. The temperature in the baking device 9 is 1000-1600 ℃, preferably 1100-1500 ℃, more preferably 1150-1400 ℃, and further preferably 1200-1300 ℃. The roasting device 9 is used for carrying out high-temperature chlorination roasting on the powder pellets for 0.2-5h, preferably 0.5-4h, more preferably 0.8-3h, and further preferably 1-2 h.
Example 1
As shown in fig. 1 and fig. 2, a system for the cooperative utilization of municipal and metallurgical refractory solid wastes as resources comprises:
1) the batching device: the batching device comprises a storage bin 1, a vibration hopper 2 and a feeding machine 3, wherein the storage bin 1 comprises a waste incineration fly ash bin 101 and a metallurgical dust bin 102, the vibration hopper 2 is arranged below discharge ports of the waste incineration fly ash bin 101 and the metallurgical dust bin 102, and the feeding machine 3 is arranged below the discharge port of the vibration hopper 2;
2) the mixing device 4: the discharge port of the feeder 3 is connected with the feed port of the mixing device 4 through a first mineral aggregate conveying device G1;
3) and (5) a moistening and grinding machine: the discharge hole of the mixing device 4 is connected with the feed hole of the moistening and grinding machine 5 through a third mineral aggregate conveying device G3;
4) and (6) pelletizing: the discharge hole of the moistening and grinding machine 5 is connected with the feed hole of the pelletizer 6 through a fourth mineral aggregate conveying device G4;
5) the drying device 7: the discharge hole of the pelletizer 6 is connected with the feed hole of the drying device 7 through a fifth mineral aggregate conveying device G5;
6) the preheating device 8: the discharge hole of the drying device 7 is connected with the feed hole of the preheating device 8 through a sixth mineral aggregate conveying device G6;
7) a roasting device 9: the discharge hole of the preheating device 8 is connected with the feed hole of the roasting device 9 through a seventh mineral aggregate conveying device G7.
The vibration hopper 2 is a vibration funnel. The feeder 3 is a constant feeder. The digester is a 401-bit multi-stage digester, and is preferably a two-stage digester. The 6-bit disc pelletizer of the pelletizer. The drying device 7 is a trolley with grid bars. The preheating device is an 8-position chain grate. The roasting device is 9-position shaft furnace.
Example 2
Example 1 is repeated except that the system further comprises: 8) a cooling device 10. The discharge port of the roasting device 9 is connected with the feed port of the cooling device 10 through an eighth mineral aggregate conveying device G8. The discharge port of the cooling device 10 is connected to the blast furnace iron-making plant through a ninth mineral aggregate conveying device G9.
Example 3
Example 2 is repeated except that the system further comprises: 9) flue gas treatment device 11. The flue gas outlet of the roasting device 9 is connected with the flue gas inlet of the flue gas treatment device 11 through a ninth gas conveying pipeline L9. The flue gas treatment device 11 is an anti-corrosion flue gas treatment device.
Example 4
Example 3 was repeated except that the mixing device 4 included a digester 401 and an intensive mixer 402. The discharge port of the feeder 3 is connected with the feed port of the digester 401 through a first mineral material conveying device G1, the discharge port of the digester 401 is connected with the feed port of the intensive mixer 402 through a second mineral material conveying device G2, and the discharge port of the intensive mixer 402 is connected with the feed port of the moistening and grinding machine 5 through a third mineral material conveying device G3. The drying device 7 comprises an air-blast drying section 701 and an air-draft drying section 702. The forced air drying section 701 is disposed upstream of the suction drying section 702 in the direction of travel of the fly ash and dust. The cooling device 10 includes a high-temperature cooling section 1001, a medium-temperature cooling section 1002, and a low-temperature cooling section 1003. Along the running direction of fly ash and dust, a high-temperature cooling section 1001, a medium-temperature cooling section 1002 and a low-temperature cooling section 1003 are arranged in sequence. The flue gas treatment device 11 comprises a first stage spray 1101 and a second stage spray 1102. Along the direction of flue gas discharged from the roasting device 9, a first stage spraying 1101 and a second stage spraying 1102 are arranged in sequence. The flue gas outlet of the second stage spray 1102 is connected to the stack 17 through a tenth gas duct L10. The tenth gas transmission pipeline L10 is provided with a defogging device 14, an anticorrosion blower 15 and a purifying device 16 in sequence. The digester 401 is provided with a chloride inlet 40101. The moistening and grinding machine 5 is provided with an additive inlet 501. The first section of spray 1101 is provided with a hydrochloric acid inlet. And a water inlet is formed in the second section spraying 1102. The acid-base neutralization device 20 is provided with a base inlet 2001. The roasting device 9 is provided with a coal powder inlet 901 and a fuel gas inlet 902.
Example 5
Embodiment 4 is repeated, except that the flue gas treatment device 11 includes a high-temperature section recovery apparatus 1103, a medium-temperature section recovery apparatus 1104, and a low-temperature section recovery apparatus 1105; along the direction of the flue gas discharged from the roasting device 9, a high-temperature-stage recovery unit 1103, a medium-temperature-stage recovery unit 1104, and a low-temperature-stage recovery unit 1105 are arranged in this order. The flue gas outlet of the low temperature section recovery device 1105 is connected to the chimney 17 through a tenth gas conveying pipe L10; the tenth gas conveying pipeline L10 is sequentially provided with a dust remover 22, an anti-corrosion fan 15 and a purifying device 16; the dust remover 22 is a porous film dust remover; a recovery outlet of the high-temperature section recovery equipment 1103 is connected with a copper recovery device, a recovery outlet of the medium-temperature section recovery equipment 1104 is connected with a lead recovery device, and a recovery outlet of the low-temperature section recovery equipment 1105 is connected with a zinc recovery device; the dust outlet of the dust separator 22 is connected to the feed port of the intensive mixer 402 via a dust conveying device G11.
Example 6
Example 4 was repeated except that the liquid outlet of the first stage spray 1101 was connected to the filtration device 19 via a first liquid delivery device Y1. The filter device 19 comprises a liquid outlet and a solid outlet, and the liquid outlet of the filter device 19 is connected with the filter pressing device 21 through a fourth liquid conveying device Y4. The liquid outlet of the second stage spray 1102 is connected to the acid-base neutralization device 20 through a second liquid delivery device Y2. The solid outlet of the filtering device 19 and the solid outlet of the filter pressing device 21 are conveyed to the valuable metal recovery device through a tenth mineral aggregate conveying device G10. The air is delivered to the air inlet of the cooling device 10 through the first gas delivery duct L1. Preferably, the air is independently supplied to the air inlets of the high-temperature cooling section 1001, the medium-temperature cooling section 1002, and the low-temperature cooling section 1003 through the first gas supply line L1. The gas outlet of the high temperature cooling section 1001 is connected to the gas inlet of the preheating device 8 through a second gas delivery pipe L2. The gas outlet of the medium temperature cooling section 1002 is connected to the gas inlet of the suction drying section 702 through a third gas conveying pipe L3. The gas outlet of the sub-cooling section 1003 is connected to the gas inlet of the forced air drying section 701 through a fourth gas transportation conduit L4. The gas outlet of the preheating device 8 is connected with a fifth gas conveying pipeline L5. The gas outlet of the extraction drying section 702 is connected with a sixth gas conveying pipeline L6. The body outlet of the forced air drying section 701 is connected with a seventh gas conveying pipeline L7. The fifth gas delivery pipe L5, the sixth gas delivery pipe L6, and the seventh gas delivery pipe L7 are combined and then connected to the gas inlet of the roasting apparatus 9 through the eighth gas delivery pipe L8. A flue gas outlet of the roasting device 9 is connected with a flue gas inlet of the first section of spraying 1101 through a ninth gas conveying pipeline L9; the flue gas outlet of the roasting device 9 is overlapped with the feed inlet of the roasting device 9, and the gas inlet of the roasting device 9 is overlapped with the discharge outlet of the roasting device 9. The discharge port of the acid-base neutralization device 20 is connected to the chloride inlet 40101 through a third liquid conveying device Y3. The hydrochloric acid inlet of the first stage spray 1101 is connected with a hydrochloric acid conveying device Y6. The water inlet of the second stage spray 1102 is connected with a water conveying device Y7. The liquid outlet of the filter press device 21 is connected to the hydrochloric acid delivery device Y6 through a fifth liquid delivery device Y5. The first gas delivery pipe L1 is provided with a first blower 13. The fourth gas delivery pipe L4 is provided with a second blower 12. An exhaust fan 18 is arranged on the sixth gas conveying pipeline L6.
Example 7
Example 6 is repeated except that the system further comprises an air delivery duct L11. Air is delivered to the eighth gas delivery line L8 through an air delivery line L11.
Use example 1
As shown in fig. 3 and 4, the process for the cooperative utilization of municipal and metallurgical refractory solid wastes comprises the following steps:
1) preparing materials: the waste incineration fly ash in the waste incineration fly ash bin 101 and the metallurgical dust in the metallurgical dust bin 102 are conveyed to a mixing device 4 through a first mineral aggregate conveying device G1 after passing through a vibration hopper 2 and a feeder 3;
2) mixing: mixing the waste incineration fly ash and the metallurgical dust in a mixing device 4, and uniformly mixing to obtain mixed powder;
3) and (3) moistening and grinding: conveying the mixed powder to a moistening and grinding machine 5 through a third mineral aggregate conveying device G3 for moistening and grinding, and mixing the moistened and ground mixed powder;
4) pelletizing: conveying the mixed powder subjected to the wet grinding to a pelletizer 6 through a fourth mineral aggregate conveying device G4 for pelleting to obtain powder pellets;
5) and (3) drying: conveying the powder pellets to a drying device 7 through a fifth mineral aggregate conveying device G5 for drying to obtain dried powder pellets;
6) preheating: conveying the dried powder pellets to a preheating device 8 through a sixth mineral aggregate conveying device G6 for preheating, so as to improve the temperature and strength of the powder pellets and obtain the preheated powder pellets;
7) roasting: and conveying the preheated powder pellets to a roasting device 9 through a seventh mineral aggregate conveying device G7 for high-temperature chlorination roasting.
Use example 2
Example 1 was repeated except that the process further included: 8) and (3) cooling: and conveying the powder pellets subjected to high-temperature chlorination roasting to a cooling device 10 through an eighth mineral aggregate conveying device G8 for cooling. Preferably, the cooled powder pellets are conveyed to a blast furnace iron-making workshop for iron making through a ninth mineral aggregate conveying device G9.
Use example 3
Example 2 was repeated except that the mixing device 4 included a digester 401 and an intensive mixer 402. The powder is conveyed to a digester 401 through a discharge port of the feeder 3 by a first mineral aggregate conveying device G1 for digestion and mixing, and then the powder after digestion and mixing is conveyed to an intensive mixer 402 by a second mineral aggregate conveying device G2 for intensive mixing to obtain mixed powder. The drying device 7 comprises an air-blast drying section 701 and an air-draft drying section 702. And conveying the powder pellets to an air blowing drying section 701 through a fifth mineral aggregate conveying device G5 for drying, and then drying through an air draft drying section 702 to obtain dried powder pellets. The cooling device 10 includes a high-temperature cooling section 1001, a medium-temperature cooling section 1002, and a low-temperature cooling section 1003. The powder material pellets after high-temperature chlorination roasting are conveyed to the cooling device 10 through an eighth mineral aggregate conveying device G8, and are sequentially cooled through a high-temperature cooling section 1001, a medium-temperature cooling section 1002 and a low-temperature cooling section 1003. The air is delivered to the air inlet of the cooling device 10 through the first gas delivery duct L1. Preferably, the air is independently supplied to the air inlets of the high-temperature cooling section 1001, the medium-temperature cooling section 1002, and the low-temperature cooling section 1003 through the first gas supply line L1. After the air exchanges heat with the powder pellets after high-temperature chlorination roasting in the cooling device 10, the gas of the high-temperature cooling section 1001 is conveyed to the preheating device 8 through the second gas conveying pipeline L2 to be used for heating materials, the gas of the high-temperature cooling section 1001 exchanges heat with the powder pellets in the preheating device 8, and the gas after heat exchange is connected to the fifth gas conveying pipeline L5. The gas of the medium temperature cooling section 1002 is conveyed to the gas inlet of the air draft drying section 702 through a third gas conveying pipeline L3 to dry the materials, the gas of the medium temperature cooling section 1002 exchanges heat with the powder pellets in the air draft drying section 702, and the gas after heat exchange is connected to a sixth gas conveying pipeline L6. The gas of the low-temperature cooling section 1003 is conveyed to a gas inlet of the blowing drying section 701 through a fourth gas conveying pipeline L4 to primarily dry the materials, the gas of the low-temperature cooling section 1003 exchanges heat with powder pellets in the blowing drying section 701, and the gas after heat exchange is connected to a seventh gas conveying pipeline L7. The combined gases in the fifth gas transfer line L5, the sixth gas transfer line L6, and the seventh gas transfer line L7 are transferred to the gas inlet of the roasting apparatus 9 through the eighth gas transfer line L8, and the combined gases are roasted in the roasting apparatus 9. The first gas conveying pipeline L1 is provided with a first air blower 13, and the cooling device 10 adopts air blast cooling. A second air blower 12 is arranged on the fourth gas conveying pipeline L4, and the forced air drying section 701 adopts forced air drying. An exhaust fan 18 is arranged on the sixth gas conveying pipeline L6, and the exhaust drying section 702 adopts exhaust drying. The system further comprises an air delivery conduit L11 through which air is delivered to the eighth gas delivery conduit L8 via air delivery conduit L11.
Use example 4
As shown in fig. 4 and 5, example 3 was reused except that the process further included: 9) flue gas treatment: the gas discharged from the roasting device 9 is conveyed to the flue gas treatment device 11 through a ninth gas conveying pipeline L9 for flue gas treatment, and the flue gas treated by the flue gas treatment device 11 is conveyed to the chimney 17 through a tenth gas conveying pipeline L10 for emission. The flue gas treatment device 11 comprises a first stage spray 1101 and a second stage spray 1102. The gas discharged from the roasting device 9 is conveyed to the flue gas treatment device 11 through a ninth gas conveying pipeline L9, and is subjected to flue gas treatment sequentially through a first stage spray 1101 and a second stage spray 1102. The flue gas treated by the flue gas treatment device 11 sequentially passes through the demisting device 14 on the tenth gas conveying pipeline L10 to be demisted, and the anticorrosive fan 15 and the purification device 16 to be purified, and then is conveyed to the chimney 17 to be discharged. In the first stage spraying 1101, hydrochloric acid is adopted to spray the flue gas entering the first stage spraying 1101, and a cleaning solution is obtained after spraying. The washing liquid was transported to the filtering apparatus 19 by the first liquid transporting apparatus Y1 to be filtered, to obtain a filtered filtrate and a filtered solid. And conveying the filtered filtrate to a filter pressing device 21 through a fourth liquid conveying device Y4 for filter pressing to obtain filter pressing filtrate and a filter cake. The filter-pressing filtrate is conveyed to a hydrochloric acid inlet of the first stage spraying 1101 through a fifth liquid conveying device Y5. In the second stage spray 1102, the flue gas entering the second stage spray 1102 is sprayed with water. The hydrogen chloride gas in the flue gas is completely absorbed by water, and the obtained solution is conveyed to the acid-base neutralization device 20 for neutralization through a second liquid conveying device Y2. The neutralized chloride is transported by a third liquid transport means Y3 to the chloride inlet 40101 of the digester 401.
The digester 401 is provided with a chloride inlet 40101. When the powder is conveyed to the digester 401 through the discharge port of the feeder 3 by the first mineral aggregate conveying device G1 for digestion and mixing, chloride is added or sprayed from the chloride inlet 40101, wherein the chloride is calcium chloride solution. The moistening and grinding machine 5 is provided with an additive inlet 501. When the mixed powder is conveyed to the moistening and grinding machine 5 through the third mineral aggregate conveying device G3 for moistening and grinding, an additive is added from an additive inlet 501, wherein the additive is bentonite, and the weight of the additive is 1.5 percent of the weight of the mixed powder. The acid-base neutralization device 20 is provided with a base inlet 2001. When the resultant solution is transported to the acid-base neutralization device 20 by the second liquid transport device Y2 for neutralization, an alkali, which is a calcium hydroxide solution, is added from the alkali inlet 2001. The roasting device 9 is provided with a coal powder inlet 901 and a fuel gas inlet 902, and the preheated powder pellets are sprayed into the roasting device 9 when the roasting device 9 is used for high-temperature chlorination roasting. The flue gas outlet of the roasting device 9 is overlapped with the feed inlet of the roasting device 9, and the gas inlet of the roasting device 9 is overlapped with the discharge outlet of the roasting device 9.
The diameter of the powder pellets obtained by granulation in the step 4) is 10 mm.
In the step 7), the temperature of the powder pellets entering the roasting device 9 is 600 ℃. The temperature in the roasting apparatus 9 was 1200 ℃. The roasting device 9 is used for carrying out high-temperature chlorination roasting on the powder pellets for 1.5 hours.
Use example 5
Example 4 was repeated except that the process further included: 10) recovering valuable metals: the filtered solids and the filter cake are conveyed to a valuable metal recovery unit for valuable metal recovery by a tenth mineral aggregate conveying device G10.
Use example 6
Example 3 is repeatedly used, except that the flue gas treatment device 11 includes a high-temperature section recovery apparatus 1103, a medium-temperature section recovery apparatus 1104, and a low-temperature section recovery apparatus 1105; the gas discharged from the roasting device 9 is conveyed to the flue gas treatment device 11 through a ninth gas conveying pipeline L9, and is subjected to flue gas treatment sequentially through a high-temperature-section recovery device 1103, a medium-temperature-section recovery device 1104 and a low-temperature-section recovery device 1105; the flue gas treated by the flue gas treatment device 11 is sequentially subjected to flue gas purification by the dust remover 22, the anticorrosive fan 15 and the purification device 16 on the tenth gas conveying pipeline L10, and then is conveyed to the chimney 17 for emission.
Copper chloride obtained by recovery of the high-temperature section recovery equipment 1103 is conveyed to a copper recovery device from a recovery outlet of the high-temperature section recovery equipment 1103, lead chloride obtained by recovery of the medium-temperature section recovery equipment 1104 is conveyed to a lead recovery device from a recovery outlet of the medium-temperature section recovery equipment 1104, and zinc chloride obtained by recovery of the low-temperature section recovery equipment 1105 is conveyed to a zinc recovery device from a recovery outlet of the low-temperature section recovery equipment 1105; the dust outlet of the dust separator 22 is connected to the feed port of the intensive mixer 402 via a dust conveying device G11.
Use example 7
Example 4 was repeated except that the additive was bentonite, the weight of the additive being 5% of the weight of the powder mix.
The diameter of the powder material pellet obtained by granulation in the step 4) is 15 mm.
In the step 7), the temperature of the powder pellets entering the roasting device 9 is 400 ℃. The temperature in the roasting device 9 was 1500 ℃. The roasting device 9 is used for carrying out high-temperature chlorination roasting on the powder pellets for 3 hours.
The method of the invention used in examples 4-6 was used to treat waste incineration fly ash and metallurgical dust:
table 1:
Claims (10)
1. A municipal and metallurgical difficult-to-treat solid waste is system of utilization as resource in coordination, and this system includes:
1) the batching device: the batching device comprises a stock bin (1);
2) mixing device (4): the discharge hole of the storage bin (1) is connected with the feed inlet of the mixing device (4) through a first mineral aggregate conveying device (G1);
3) a moistening and grinding machine (5): the discharge hole of the mixing device (4) is connected with the feed hole of the moistening and grinding machine (5) through a third mineral aggregate conveying device (G3);
4) pelletizer (6): the discharge hole of the moistening and grinding machine (5) is connected with the feed inlet of the pelletizer (6) through a fourth mineral aggregate conveying device (G4);
5) drying device (7): the discharge hole of the pelletizer (6) is connected with the feed inlet of the drying device (7) through a fifth mineral aggregate conveying device (G5);
6) preheating device (8): the discharge hole of the drying device (7) is connected with the feed inlet of the preheating device (8) through a sixth mineral aggregate conveying device (G6);
7) baking device (9): the discharge hole of the preheating device (8) is connected with the feed inlet of the roasting device (9) through a seventh mineral aggregate conveying device (G7).
2. The system of claim 1, wherein: the system further comprises:
8) cooling device (10): the discharge hole of the roasting device (9) is connected with the feed hole of the cooling device (10) through an eighth mineral aggregate conveying device (G8); preferably, the discharge port of the cooling device (10) is connected to a blast furnace iron-making plant through a ninth mineral aggregate conveying device (G9); and/or
The system further comprises: 9) flue gas treatment device (11): a flue gas outlet of the roasting device (9) is connected with a flue gas inlet of the flue gas treatment device (11) through a ninth gas conveying pipeline (L9); and/or
The batching device comprises a storage bin (1), vibrating hoppers (2) and a feeding machine (3), wherein the storage bin (1) comprises a waste incineration fly ash bin (101) and a metallurgical dust bin (102), the two vibrating hoppers (2) are respectively arranged below respective discharge ports of the waste incineration fly ash bin (101) and the metallurgical dust bin (102), and the feeding machine (3) is arranged below the discharge ports of the vibrating hoppers (2); the discharge port of the feeder (3) is connected with the feed port of the mixing device (4) through a first mineral aggregate conveying device (G1).
3. The system according to claim 1 or 2, characterized in that: the mixing device (4) comprises a digester (401) and an intensive mixer (402); the discharge port of the feeder (3) is connected with the feed port of the digester (401) through a first mineral aggregate conveying device (G1), the discharge port of the digester (401) is connected with the feed port of the intensive mixer (402) through a second mineral aggregate conveying device (G2), and the discharge port of the intensive mixer (402) is connected with the feed port of the moistening and grinding machine (5) through a third mineral aggregate conveying device (G3); and/or
The drying device (7) comprises an air blowing drying section (701) and an air draft drying section (702), and the air blowing drying section (701) is arranged at the upstream of the air draft drying section (702) along the running direction of the fly ash and the dust.
4. A system according to claim 2 or 3, characterized in that: the cooling device (10) comprises a high-temperature cooling section (1001), a medium-temperature cooling section (1002) and a low-temperature cooling section (1003), wherein the high-temperature cooling section (1001), the medium-temperature cooling section (1002) and the low-temperature cooling section (1003) are sequentially arranged along the running direction of fly ash and dust; and/or
The flue gas treatment device (11) comprises a first section of spraying (1101) and a second section of spraying (1102); along the direction of flue gas discharged by the roasting device (9), a first section of spraying (1101) and a second section of spraying (1102) are arranged in sequence; or the flue gas treatment device (11) comprises a porous membrane dust collector; more preferably, the porous dust collector is a flexible dust collector or a ceramic dust collector; or
The flue gas treatment device (11) comprises a high-temperature section recovery device (1103), a medium-temperature section recovery device (1104) and a low-temperature section recovery device (1105); along the direction of flue gas discharged by the roasting device (9), a high-temperature section recovery device (1103), a medium-temperature section recovery device (1104) and a low-temperature section recovery device (1105) are arranged in sequence.
5. The system of claim 4, wherein: the system further comprises: the flue gas outlet of the second stage spray (1102) is connected to a chimney (17) through a tenth gas conveying pipeline (L10); optionally, a demisting device (14) and/or an anticorrosive fan (15) and/or a purifying device (16) are/is sequentially arranged on the tenth gas conveying pipeline (L10); or,
the flue gas outlet of the low-temperature section recovery (1105) is connected to a chimney (17) through a tenth gas conveying pipeline (L10); optionally, a dust remover (22) and/or an anti-corrosion fan (15) and/or a purification device (16) are/is sequentially arranged on the tenth gas conveying pipeline (L10); preferably, the dust collector (22) is a porous film dust collector;
and/or
The system further comprises: the liquid outlet of the first stage spray (1101) is connected with the filtering device (19) through a first liquid conveying device (Y1); the filtering device (19) comprises a liquid outlet and a solid outlet, and the liquid outlet of the filtering device (19) is connected with the filter pressing device (21) through a fourth liquid conveying device (Y4); the liquid outlet of the second section of spraying (1102) is connected to the acid-base neutralization device (20) through a second liquid conveying device (Y2); preferably, the solid outlet of the filtering device (19) and the solid outlet of the filter pressing device (21) are conveyed to the valuable metal recovery device through a tenth mineral aggregate conveying device (G10); or
A recovery outlet of the high-temperature section recovery equipment (1103) is connected with a copper recovery device, a recovery outlet of the medium-temperature section recovery equipment (1104) is connected with a lead recovery device, and a recovery outlet of the low-temperature section recovery equipment (1105) is connected with a zinc recovery device; preferably, the dust outlet of the dust separator (22) is connected to the inlet of the intensive mixer (402) via a dust conveying device (G11).
6. The system of claim 5, wherein: a chloride inlet (40101) is arranged on the digester (401); an additive inlet (501) is arranged on the moistening and grinding machine (5); a hydrochloric acid inlet is arranged on the first section of spraying (1101); a water inlet is arranged on the second section of spraying pipe (1102); an alkali inlet (2001) is formed in the acid-alkali neutralization device (20); and/or
The roasting device (9) is provided with a coal powder inlet (901) and/or a fuel gas inlet (902).
7. The system of claim 6, wherein: the system further comprises: air is conveyed to an air inlet of the cooling device (10) through a first gas conveying pipeline (L1), and preferably, the air is independently conveyed to air inlets of a high-temperature cooling section (1001), a medium-temperature cooling section (1002) and a low-temperature cooling section (1003) through a first gas conveying pipeline (L1); the gas outlet of the high-temperature cooling section (1001) is connected to the gas inlet of the preheating device (8) through a second gas conveying pipeline (L2); the gas outlet of the medium-temperature cooling section (1002) is connected to the gas inlet of the suction drying section (702) through a third gas conveying pipeline (L3); the gas outlet of the low-temperature cooling section (1003) is connected to the gas inlet of the forced air drying section (701) through a fourth gas conveying pipeline (L4); the gas outlet of the preheating device (8) is connected with a fifth gas conveying pipeline (L5); the gas outlet of the air draft drying section (702) is connected with a sixth gas conveying pipeline (L6); the body outlet of the blowing and drying section (701) is connected with a seventh gas conveying pipeline (L7); the fifth gas conveying pipeline (L5), the sixth gas conveying pipeline (L6) and the seventh gas conveying pipeline (L7) are combined and then connected to a gas inlet of the roasting device (9) through an eighth gas conveying pipeline (L8); a flue gas outlet of the roasting device (9) is connected with a flue gas inlet of the first section of spraying (1101) or a flue gas inlet of the high-temperature section of recovery equipment (1103) through a ninth gas conveying pipeline (L9);
preferably, the flue gas outlet of the roasting device (9) and the feed inlet of the roasting device (9) are arranged on the same side of the roasting device (9), and the gas inlet of the roasting device (9) and the discharge outlet of the roasting device (9) are arranged on the same side of the roasting device (9); more preferably, the flue gas outlet of the roasting device (9) is overlapped with the feed inlet of the roasting device (9), and the gas inlet of the roasting device (9) is overlapped with the discharge outlet of the roasting device (9).
8. The system of claim 7, wherein: the discharge hole of the acid-base neutralization device (20) is connected to a chloride inlet (40101) through a third liquid conveying device (Y3); the hydrochloric acid inlet of the first stage spray (1101) is connected with a hydrochloric acid conveying device (Y6); the water inlet of the second stage spray (1102) is connected with a water conveying device (Y7); the liquid outlet of the filter pressing device (21) is connected to the hydrochloric acid conveying device (Y6) or the hydrochloric acid inlet of the first stage spraying device (1101) through a fifth liquid conveying device (Y5).
9. The system according to claim 7 or 8, characterized in that: a first air blower (13) is arranged on the first gas conveying pipeline (L1); a second air blower (12) is arranged on the fourth gas conveying pipeline (L4); an exhaust fan (18) is arranged on the sixth gas conveying pipeline (L6); and/or
The system further comprises an air delivery duct (L11), through which air is delivered (L11) to an eighth gas delivery duct (L8) or to a gas inlet of the roasting apparatus (9).
10. The system according to any one of claims 1-9, wherein: the vibration hopper (2) is a vibration funnel; the feeder (3) is a constant feeder; the digester (401) is a multi-stage digester, preferably a two-stage digester or a three-stage digester; the drying device (7) is a trolley with grid bars; the preheating device (8) is a chain grate; the roasting device (9) is one of a shaft furnace, a rotary hearth furnace, a ring type roasting machine, a rotary kiln or a belt type roasting machine; the flue gas treatment device (11) is an anti-corrosion flue gas treatment device.
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