CN115505726A - Recycling treatment method for metal-containing organic solid wastes - Google Patents

Recycling treatment method for metal-containing organic solid wastes Download PDF

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Publication number
CN115505726A
CN115505726A CN202211195961.3A CN202211195961A CN115505726A CN 115505726 A CN115505726 A CN 115505726A CN 202211195961 A CN202211195961 A CN 202211195961A CN 115505726 A CN115505726 A CN 115505726A
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metal
solid waste
flue gas
containing organic
gas
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CN202211195961.3A
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Chinese (zh)
Inventor
殷波
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Wuxi Xuelang Environmental Technology Co Ltd
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Wuxi Xuelang Environmental Technology Co Ltd
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Priority to CN202211195961.3A priority Critical patent/CN115505726A/en
Publication of CN115505726A publication Critical patent/CN115505726A/en
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    • 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
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/02—Roasting processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D5/00—Condensation of vapours; Recovering volatile solvents by condensation
    • B01D5/0003—Condensation of vapours; Recovering volatile solvents by condensation by using heat-exchange surfaces for indirect contact between gases or vapours and the cooling medium
    • 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
    • B01D53/002—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 condensation
    • 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
    • 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
    • C22B7/04—Working-up slag
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/44—Details; Accessories
    • F23G5/46—Recuperation of heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2206/00—Waste heat recuperation
    • F23G2206/20—Waste heat recuperation using the heat in association with another installation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2209/00—Specific waste
    • F23G2209/14—Gaseous waste or fumes
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The invention provides a recycling treatment method for metal-containing organic solid wastes, which can finish the recycling treatment of the metal-containing organic solid wastes with lower cost, and has simple process flow and easy realization. It comprises the following steps: s1: sending the metal-containing organic solid waste to be treated into a roasting system for thermal decomposition to realize the pre-reduction of metal, wherein the residue containing the metal forms massive solid waste residues in the pre-reduction; s2: solid waste slag generated by the roasting system is sent into a smelting system for smelting metal recovery; s3: the pyrolysis flue gas generated by the roasting system is purified and then sent into an indirect condensation system, and after condensation treatment, the flue gas is divided into cool condensate gas and non-condensate gas; s4: separating the condensed gas to obtain heavy oil, light oil and waste water; s5: feeding the non-condensable gas into a combustion chamber in the system, and oxidizing and decomposing combustible gas and organic matter harmful substances in the flue gas; the heat output by the combustion chamber is recovered into the system; s6: the flue gas output by the combustion chamber is sent into a tail gas purification system after heat recovery.

Description

Recycling treatment method for metal-containing organic solid wastes
Technical Field
The invention relates to the technical field of organic solid waste treatment, in particular to a recycling treatment method for metal-containing organic solid waste.
Background
In the prior art, in the treatment method of the metal-containing organic solid waste, a common method is that waste is firstly sent into a melting furnace for thermal decomposition, and then incineration flue gas is sent into a secondary combustion chamber for treatment, but the organic matter content in the flue gas sent out from the melting furnace is very high, the incineration temperature of the secondary combustion chamber can be usually fully decomposed only when the incineration temperature reaches more than 1600 ℃, the combustion temperature needs the secondary combustion chamber to bear very high heat load, and the requirements on the structure and the casting material of the secondary combustion chamber are very high; meanwhile, long-chain macromolecular substances in the flue gas are oxidized and decomposed for a long time, so that the requirements on parameters of a secondary combustion chamber and subsequent flue gas treatment equipment are higher, the process is more complex, and the system cost is higher. In another common method for treating metal-containing organic solid waste, the solid waste is firstly sent into leachate to leach metal, and then the organic solid waste is incinerated; however, because of the limitations of the existing process level, metals cannot be removed completely by leachate, secondary metal removal is required when organic solid incineration waste flue gas is treated, and the process flow not only generates a large amount of process wastewater, but also has the problems of complex process and high system operation cost.
Disclosure of Invention
In order to solve the problems of complex process and overhigh system operation cost of the treatment method of the metal-containing organic solid waste in the prior art, the invention provides a recycling treatment method of the metal-containing organic solid waste, which can finish recycling treatment of the metal-containing organic solid waste with lower cost, has simple process flow and is easy to realize.
The technical scheme of the invention is as follows: a method for recycling metal-containing organic solid waste is characterized by comprising the following steps:
s1: sending metal-containing organic solid waste to be treated into a roasting system for thermal decomposition to realize pre-reduction of metal, wherein the residues containing the metal form blocky solid waste residues in the pre-reduction;
the temperature of the pyrolysis section of the roasting system does not exceed 500 ℃;
s2: the solid waste slag generated by the roasting system is sent to a smelting system for smelting metal recovery;
s3: the pyrolysis flue gas generated by the roasting system is purified and then sent into an indirect condensation system, and after condensation treatment, the flue gas is divided into cool condensate gas and non-condensate gas;
the condensed gas is a liquid oily substance; the non-condensable gas is a gaseous substance;
s4: separating the condensed gas to obtain heavy oil, light oil and wastewater;
carrying out resource utilization on heavy oil, sending the wastewater into a water treatment system, and taking light oil as a combustion chamber in the system as a heating supplementary fuel;
s5: the non-condensable gas is sent into the combustion chamber in the system to oxidize and decompose combustible gas and organic matter harmful substances in the flue gas; the heat output by the combustion chamber is recovered into the system;
s6: and after heat recovery, the flue gas output by the combustion chamber is sent into a tail gas purification system, and is discharged after the flue gas purification reaches the discharge standard.
It is further characterized in that:
the baking system in step S1, comprising: a vertical roasting furnace or an oxygen-enriched side-blown furnace;
the core temperature of the roasting system is 900 to 1100 ℃, the pyrolysis section is not more than 500 ℃, and the temperature of outlet flue gas is not more than 300 ℃;
the melting system in step S2 includes: an electric arc furnace or a smelting furnace;
in the step S2, tail gas generated by the smelting system is also sent into the combustion chamber for thermal decomposition treatment;
in step S3, the indirect condensing system includes: a flue gas heat exchanger;
the combustion chamber in steps S4 and S5 includes: a secondary combustion chamber or RTO;
when the combustion chamber is a secondary combustion chamber, feeding the incinerated flue gas into a heat recovery system, wherein the recovered heat is used for heating, drying and dehydrating the to-be-treated metal-containing organic solid waste before incineration in the step S1;
when the combustion chamber is an RTO, recovering heat of outlet flue gas of the RTO, wherein the recovered heat is used for heating inlet flue gas of the RTO;
in step S6, the exhaust gas purification system includes: the system comprises a quench tower, a bag-type dust remover, a dry-method wet-method desulphurization system and an SCR denitration system;
and in the step S3, the pyrolysis flue gas is purified by a cyclone dust collector and then is sent into the indirect condensing system.
According to the resource treatment method for the metal-containing organic solid waste, provided by the invention, the roasting system with the temperature of the pyrolysis section below 500 ℃ is used for roasting and thermally decomposing the metal-containing organic solid waste, so that special combustion equipment is not required, and the system cost is reduced; then, the metal in the solid waste is recovered through a smelting system, the smelting system can recover most of the metal, the residual metal content in the flue gas can reach the emission standard after being treated by a subsequent tail gas purification system, and the metal content in the flue gas does not need to be subjected to special secondary treatment, so that the process complexity is reduced; the indirect condensation system is used for classifying the heavy oil in the flue gas, so that most of the heavy oil can be recycled, the process complexity is reduced, and the heavy oil can be recycled to obtain additional benefits; harmful substance such as light oil and carbon monoxide carry out burning decomposition treatment through the combustion chamber, have reduced subsequent tail gas clean-up system's the processing degree of difficulty, and the heat recovery that the combustion chamber produced simultaneously has further reduced the whole running cost of system to the system.
Drawings
FIG. 1 is a process flow diagram of the method for recycling metal-containing organic solid wastes in the present invention.
Detailed Description
As shown in FIG. 1, the present invention comprises a method for treating solid waste containing metal organic materials as resources, which comprises the following steps.
S1: the method has the advantages that the metal-containing organic solid waste to be treated is sent into a roasting system for thermal decomposition, so that the pre-reduction of metal is realized, the pre-reduced metal exists in the form of massive solid waste slag, the feeding requirement of a subsequent smelting system is met, a material caking procedure is not required to be specially set for feeding of the smelting system, and the structure of the system is simplified;
when the roasting system carries out pre-reduction on the solid waste, the flue gas and the materials carry out countercurrent heat exchange, and the organic matters in a low-temperature section below 500 ℃ are thermally decomposed and released into the flue gas, so that most metals can be kept in the solid waste. The core temperature of the roasting system used in the invention is 900-1100 ℃, the pyrolysis section is not more than 500 ℃, the temperature of the outlet flue gas is not more than 300 ℃, the existing vertical counter-current roasting furnace or oxygen-enriched side-blown furnace can meet the conditions, and the pyrolysis operation of the metal-containing organic solid waste is realized.
S2: sending the inorganic solid waste slag generated by the roasting system into a smelting system for recovering smelting metal;
generally, a smelting furnace such as an electric arc furnace or a side-blown furnace is used for recovering metals in solid waste slag, and most of metal substances can be recovered; the tail gas generated by the smelting system is also sent into the combustion chamber for thermal oxidation treatment, and a tail gas treatment system does not need to be independently arranged for the smelting system, so that the system complexity is reduced, and the system cost is reduced.
S3: pyrolysis flue gas generated by a roasting system consisting of a vertical type countercurrent roasting furnace or an oxygen-enriched side-blown furnace is purified by a cyclone dust collector and then is sent into an indirect condensation system, and after condensation treatment, the flue gas is divided into cooling condensation gas and non-condensation gas; the indirect condensing system is realized by using a flue gas heat exchanger in the prior art.
The condensed gas obtained after heat exchange is a liquid oily substance (marked as pyrolysis liquid in figure 1); the non-condensable gas is a gaseous substance.
S4: carrying out oil-water separation on the condensed gas to obtain heavy oil, light oil and wastewater (marked as pyrolysis water in figure 1);
the heavy oil is recycled, the wastewater is sent into a water treatment system in the system for subsequent treatment, and the light oil is sent into the combustion chamber for secondary combustion treatment, so that a treatment system specially arranged for the light oil is not required, the system structure is simplified, and meanwhile, the light oil is used as a combustion chamber temperature-rising supplementary fuel, so that the system operation cost is reduced. The separated wastewater can be fully treated based on a water treatment system in the existing system, and a special water treatment device is not required to be arranged.
S5: the non-condensable gas is sent into a combustion chamber, and combustible gas (such as carbon monoxide) and organic matter harmful substances (such as harmful organic matters like dioxin) in the flue gas are decomposed by combustion and oxidation, so that the working complexity of a subsequent tail gas purification system is reduced, and the operation cost of the system is reduced.
The heat output by the combustion chamber is recovered into the system; the combustion chamber may be implemented based on a secondary combustion chamber or RTO (Regenerative Thermal Oxidizer).
When the combustion chamber is a secondary combustion chamber, the burned flue gas is sent into a heat recovery system, the heat recovery system is realized based on the heat recovery system which takes the flue gas as a heat source in the prior art, and the recovered heat is used for heating the to-be-treated metal-containing organic solid waste before burning in the step S1, so that the drying and dehydration of the solid waste are realized; after the to-be-treated metal-containing organic solid waste heated and dried by burning smoke in the secondary combustion chamber is subjected to thermal decomposition in the roasting system, water molecules contained in the smoke are reduced, the content of waste water obtained after condensation by the indirect condensation system is reduced, and the integral sewage discharge amount of the system is reduced.
When the combustion chamber is the RTO, carry out heat recovery with the export flue gas of RTO, the heat after retrieving is used for the intensification to RTO import flue gas, ensures to reduce the energy consumption of RTO system, and then has reduced the holistic running cost of system.
S6: and (4) recovering the heat of the S5 from the flue gas output by the combustion chamber, sending the flue gas into a tail gas purification system, and performing flue gas purification to discharge the flue gas after the flue gas reaches the discharge standard.
The exhaust gas purification system includes: a quench tower, a cloth bag dust removal system, a dry wet desulphurization system and an SCR denitration system; the tail gas purification system is constructed based on the prior art, a special structure is not required to be arranged, and the overall cost of the system in the technical scheme of the invention is ensured to be low.
After the technical scheme is used, most of metals are recycled through the smelting system, heavy oil containing macromolecules is separated through the indirect condensing system, the difficulty in subsequent flue gas treatment is reduced, the complexity of the whole process is controlled, the metal-containing organic solid waste can be recycled at low cost, meanwhile, the used equipment is realized based on the existing equipment, no special equipment is needed, and the practicability of the technical scheme is improved.

Claims (10)

1. A method for recycling metal-containing organic solid waste is characterized by comprising the following steps:
s1: sending metal-containing organic solid waste to be treated into a roasting system for thermal decomposition to realize pre-reduction of metal, wherein the residues containing the metal form blocky solid waste residues in the pre-reduction;
the temperature of the pyrolysis section of the roasting system does not exceed 500 ℃;
s2: the solid waste slag generated by the roasting system is sent into a smelting system for smelting metal recovery;
s3: the pyrolysis flue gas generated by the roasting system is purified and then sent into an indirect condensation system, and after condensation treatment, the flue gas is divided into cool condensate gas and non-condensate gas;
the condensed gas is a liquid oily substance; the non-condensable gas is a gaseous substance;
s4: separating the condensed gas to obtain heavy oil, light oil and wastewater;
carrying out resource utilization on the heavy oil, sending the wastewater into a water treatment system, and taking the light oil as a combustion chamber in the system as a heating supplementary fuel;
s5: the non-condensable gas is sent into the combustion chamber in the system to oxidize and decompose combustible gas and organic matter harmful substances in the flue gas; the heat output by the combustion chamber is recovered into the system;
s6: and the flue gas output by the combustion chamber is sent into a tail gas purification system after heat recovery, and is discharged after the flue gas purification reaches the discharge standard.
2. The method for recycling metal-containing organic solid waste according to claim 1, wherein: the baking system in step S1, comprising: a vertical roasting furnace or an oxygen-enriched side-blown furnace.
3. The method for recycling metal-containing organic solid waste according to claim 1, wherein: the melting system in step S2 includes: an electric arc furnace or a smelting furnace.
4. The method for recycling metal-containing organic solid waste according to claim 1, wherein: the core temperature of the roasting system is 900 to 1100 ℃, the pyrolysis section is not more than 500 ℃, and the temperature of outlet flue gas is not more than 300 ℃.
5. The method for recycling metal-containing organic solid waste according to claim 1, wherein: in step S2, tail gas generated by the smelting system is also sent into the combustion chamber for thermal decomposition treatment.
6. The method for recycling metal-containing organic solid waste according to claim 1, wherein: in step S3, the indirect condensing system includes: a flue gas heat exchanger.
7. The method for recycling metal-containing organic solid waste according to claim 1, wherein: the combustion chamber in steps S4 and S5 includes: and when the combustion chamber is a secondary combustion chamber, the burned flue gas is sent into a heat recovery system, and the recovered heat is used for heating, drying and dehydrating the to-be-treated metal-containing organic solid waste before burning in the step S1.
8. The method for recycling metal-containing organic solid waste according to claim 1, wherein: the combustion chamber in steps S4 and S5 includes: and the RTO is used for recovering heat of outlet flue gas of the RTO when the combustion chamber is the RTO, and the recovered heat is used for heating inlet flue gas of the RTO.
9. The method for recycling metal-containing organic solid waste according to claim 1, wherein: in step S6, the exhaust gas purification system includes: a quench tower, a bag-type dust remover, a dry-method wet-method desulphurization system and an SCR denitration system.
10. The method for recycling metal-containing organic solid waste according to claim 1, wherein: in the step S3, the pyrolysis flue gas is purified by a cyclone dust collector and then is sent into the indirect condensing system.
CN202211195961.3A 2022-09-29 2022-09-29 Recycling treatment method for metal-containing organic solid wastes Withdrawn CN115505726A (en)

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CN202211195961.3A CN115505726A (en) 2022-09-29 2022-09-29 Recycling treatment method for metal-containing organic solid wastes

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Application Number Priority Date Filing Date Title
CN202211195961.3A CN115505726A (en) 2022-09-29 2022-09-29 Recycling treatment method for metal-containing organic solid wastes

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0169997A2 (en) * 1984-07-28 1986-02-05 Kernforschungszentrum Karlsruhe Gmbh Process for purifying smoke
CN106642134A (en) * 2016-11-29 2017-05-10 北京神雾环境能源科技集团股份有限公司 Method and system for combined treatment of household rubbish and fly ash
CN107828974A (en) * 2017-10-23 2018-03-23 广东绿晟环保股份有限公司 A kind of waste printed circuit board combined treatment process

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0169997A2 (en) * 1984-07-28 1986-02-05 Kernforschungszentrum Karlsruhe Gmbh Process for purifying smoke
CN106642134A (en) * 2016-11-29 2017-05-10 北京神雾环境能源科技集团股份有限公司 Method and system for combined treatment of household rubbish and fly ash
CN107828974A (en) * 2017-10-23 2018-03-23 广东绿晟环保股份有限公司 A kind of waste printed circuit board combined treatment process

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Application publication date: 20221223