CN112113223A - Method for cooperatively treating industrial hazardous waste by utilizing steel mill kiln - Google Patents
Method for cooperatively treating industrial hazardous waste by utilizing steel mill kiln Download PDFInfo
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- CN112113223A CN112113223A CN202010854456.XA CN202010854456A CN112113223A CN 112113223 A CN112113223 A CN 112113223A CN 202010854456 A CN202010854456 A CN 202010854456A CN 112113223 A CN112113223 A CN 112113223A
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- 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
- F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
- F23G5/033—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment comminuting or crushing
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- 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
- F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
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- 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
- F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
- F23G5/027—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment pyrolising or gasifying stage
- F23G5/0276—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment pyrolising or gasifying stage using direct heating
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- 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
- F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
- F23G5/12—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating using gaseous or liquid fuel
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B19/00—Combinations of furnaces of kinds not covered by a single preceding main group
- F27B19/04—Combinations of furnaces of kinds not covered by a single preceding main group arranged for associated working
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2201/00—Pretreatment
- F23G2201/30—Pyrolysing
- F23G2201/304—Burning pyrosolids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2201/00—Pretreatment
- F23G2201/80—Shredding
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2204/00—Supplementary heating arrangements
- F23G2204/10—Supplementary heating arrangements using auxiliary fuel
- F23G2204/103—Supplementary heating arrangements using auxiliary fuel gaseous or liquid fuel
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- 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
- F23G2206/10—Waste heat recuperation reintroducing the heat in the same process, e.g. for predrying
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- 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
Abstract
The invention relates to the field of recycling treatment of industrial hazardous wastes, in particular to a method for cooperatively treating industrial hazardous wastes by utilizing a furnace kiln of a steel mill, which is used for detecting and classifying the collected industrial hazardous wastes, putting the industrial hazardous wastes into a crusher in batches respectively for crushing, and separating iron materials from the industrial hazardous wastes by a magnetic separator; carrying out primary homogenization and compatibility on the industrial hazardous waste subjected to magnetic separation and iron removal to obtain waste to be fed; feeding waste to be fed to a pyrolysis gasifier; collecting pyrolysis gas as fuel, introducing the pyrolysis gas into a hot blast stove of a blast furnace for burning, sampling pyrolysis slag, analyzing the content of mineral phases and harmful elements in the pyrolysis slag, performing secondary homogenization compatibility on the pyrolysis slag and a steelmaking sintering raw material according to the requirement of a steelmaking process on element composition limitation, then performing mixed sintering, and putting the sintering ore into the blast furnace for high-temperature melting treatment. The invention has the technical effects of fully recycling heat energy and resources, low operation cost and little influence on the original production process equipment of a steel mill.
Description
Technical Field
The invention relates to the field of resource treatment of industrial hazardous wastes, in particular to a method for cooperatively treating industrial hazardous wastes by utilizing a steel mill kiln.
Background
In 2018, the national industrial hazardous waste production amount is about 4643.0 ten thousand tons. The incineration method is a main means for reducing and treating industrial hazardous wastes, and can oxidize and decompose combustible industrial hazardous wastes by high-temperature incineration to remove toxicity. At present, the burning method mainly adopts a rotary kiln and a secondary combustion chamber technology, and the technology needs to be matched with a complex tail gas treatment system so as to ensure the burnout of solid waste and the standard emission of gas. In addition, the investment and operation costs of the industrial hazardous waste incineration facility are high, and about 30-40 tons of incineration residue and fly ash are required to be further treated for each 100 tons of solid waste, so the charge for the incineration disposal is high.
The Chinese patent application (publication number: CN 110734209A) discloses an operation method of an integrated device for the cooperative treatment of industrial solid waste and sludge rotary kiln. Adopt mud spray drying (direct drying) + garden dish drying (indirect drying), rotary kiln and industry leftover bits (useless admittedly) to burn in coordination and gas cleaning system integrated device, collect that mud is dry and mud, industry leftover bits (useless admittedly) burn in coordination, gas cleaning in an organic whole. The waste is reused, and the environmental pollution is reduced. The patent can treat industrial solid waste, but needs additional equipment, increases the cost investment of the equipment, and simultaneously beneficial metals in the solid waste cannot be utilized.
China is the first world with large steel production, and the annual steel production accounts for half of the world. The main production equipment of the steel mill comprises a sintering machine, a coke machine, a rotary kiln, a blast furnace, a converter, an electric furnace, a refining furnace and the like, the high temperature and the redox characteristics of the production equipment are utilized to cooperatively treat industrial hazardous wastes, combustible substances in the industrial hazardous wastes can be thoroughly incinerated, toxic substances such as heavy metals and the like can be reduced and detoxified, or molten glass is turned into slag, so that the resource utilization can be realized. At present, the reported cooperative disposal technologies comprise a blast furnace side-blown feeding technology, a coke machine co-coking technology and a chromium slag disposal technology of a sintering machine. However, the technologies have high material selectivity to industrial hazardous wastes, single treatment type and limited application range. The industrial hazardous waste has wide sources, various types and complex components, and the design of the original equipment of the steel mill does not consider the mixing of the industrial hazardous waste in materials, so that the direct feeding can cause damages such as corrosion to the original equipment of the steel mill.
Disclosure of Invention
Aiming at the defects of the prior art, the invention combines the solid waste pyrolysis treatment technology and the steel mill production technology, the solid waste is firstly subjected to pre-pyrolysis treatment, the generated pyrolysis gas can be used as a fuel for iron making, and the solid slag generated by pyrolysis can replace part of raw materials for blast furnace iron making, and aims to provide the method for cooperatively treating industrial hazardous wastes by utilizing the steel mill furnace kiln, which has the advantages of wide application range, full recovery and utilization of heat energy and resources, low operation cost and small influence on the original production process equipment of the steel mill.
For the purpose of the invention, the following technical scheme is adopted for implementation:
a method for cooperatively treating industrial hazardous waste by utilizing a steel mill kiln comprises the following steps:
1) detecting the collected industrial hazardous waste, and storing the industrial hazardous waste in a classified manner according to the calorific value, the harmful substances and the hazardous characteristics, wherein the industrial hazardous waste comprises organic hazardous waste, metal waste and other inorganic hazardous waste except metal generated by industrial enterprises;
2) respectively putting industrial hazardous wastes into a crusher in batches for crushing, and separating iron materials from the industrial hazardous wastes through a magnetic separator;
3) the industrial hazardous waste after magnetic separation and iron removal enters different material pits according to the heat value, the water content and the element content;
4) sending the industrial hazardous waste from each material pit into a feeding pool, uniformly mixing, and carrying out primary homogenization and compatibility to obtain waste to be fed, wherein the heat value of the waste is more than 3000 kilocalories, the water content of the waste is less than 50%, and the content of harmful elements is moderate;
5) feeding waste to be fed in a feeding pool into a pyrolysis gasification furnace, blowing a proper amount of oxygen, maintaining the oxygen-deficient atmosphere in the furnace, and controlling the temperature of the pyrolysis furnace within the range of 300-1000 ℃;
6) collecting pyrolysis gas as fuel, introducing the pyrolysis gas into a hot blast stove of a blast furnace for burning, completely decomposing organic matters, and discharging generated hot air into the blast furnace from the bottom together with blast furnace gas;
7) sampling the pyrolysis slag to analyze the content of mineral phases and harmful elements in the pyrolysis slag, performing secondary homogenization compatibility on the pyrolysis slag and a steel-making sintering raw material according to the limitation requirement of a steel-making process on element components, controlling the alkalinity of sintering ore to be 1.8-2.0 according to the addition proportion of the pyrolysis slag to be 0.5-8 wt%, then performing mixed sintering, and putting the sintering ore into a blast furnace for high-temperature melting treatment.
Preferably, the industrial hazardous waste comprises organic hazardous waste generated by chemical industry, medicine, petrifaction, coating, environmental protection enterprises and inorganic hazardous waste such as electroplating sludge, metallurgy and chromium slag.
Preferably, the iron separated by the magnetic separation in the step 2) is collected, briquetted and packaged to prepare raw materials meeting the requirement of the feeding specification, and the raw materials are put into a converter or an electric furnace for smelting to replace part of iron ore and scrap iron raw materials.
Preferably, in the step 5), part of gas generated by a steel mill such as blast furnace gas, coke oven gas and the like is used as a heat source for starting temperature rise and a supplementary heat source for treating low-calorific-value waste.
Preferably, the high-temperature melted substance in the step 7) enters high-pyrolysis slag, and enters a sintering machine as return ores or is comprehensively utilized as raw materials in building material industries such as cement, aggregate, ballast, highway subgrade and the like.
The invention also provides a system for cooperatively treating industrial hazardous wastes by utilizing the steel mill kiln, which comprises a crusher, magnetic separation treatment equipment, homogenization compatibility equipment, a pyrolysis gasification furnace, a hot blast stove, a sintering machine and a blast furnace; respectively putting the collected and classified industrial hazardous wastes into a crusher for crushing, connecting a discharge port of the crusher with magnetic separation treatment equipment through a pipeline, connecting the magnetic separation treatment equipment with a material pit, connecting the material pit with a feeding pool through a grab bucket for grabbing the wastes, and arranging homogenization compatibility equipment in the feeding pool; carrying out magnetic separation treatment on the crushed waste in magnetic separation treatment equipment, feeding the industrial hazardous waste subjected to iron removal into different material pits according to the heat value, the water content and the element content, grabbing the industrial hazardous waste from each material pit to a feeding pool by a grab bucket, and carrying out primary homogenization compatibility on the industrial hazardous waste according to the heat value, the water content and the element content by homogenization compatibility equipment; the homogenizing and compatibility device is connected with the pyrolysis gasifier through a pipeline and a pump, industrial hazardous wastes after homogenizing and compatibility are thrown into the pyrolysis gasifier through a grab bucket or a solid pump for pretreatment, the upper part of the pyrolysis gasifier is connected with a hot blast stove through an air pipe, the lower part of the pyrolysis gasifier is connected with a sintering machine through a pipeline, and the sintering machine is connected with a blast furnace through a pipeline; pyrolysis gas generated by pyrolysis of solid waste gas is taken as fuel and conveyed into a hot blast furnace of the blast furnace for incineration, and generated hot air enters the blast furnace from the bottom and is discharged together with blast furnace gas; and (3) putting pyrolysis slag obtained after pyrolysis of the solid waste into a sintering machine, mixing the pyrolysis slag with raw materials in the sintering machine, sintering the raw materials and the pyrolysis slag into blocks, and putting the blocks into a blast furnace for high-temperature melting treatment.
Preferably, the industrial hazardous waste comprises organic hazardous waste produced by industrial enterprises and inorganic hazardous waste such as electroplating sludge, metallurgy and chromium slag.
Preferably, more than five material pits are arranged for temporarily storing high-calorific-value and high-harmful substances, high-calorific-value and low-harmful substances, low-calorific-value and high-harmful substances, low-calorific-value and medium-calorific-value harmful substances respectively.
Preferably, the magnetic separation treatment equipment is connected with the converter through a pipeline, and after the iron materials separated by the magnetic separation treatment equipment are collected, the iron materials are pressed into blocks and packed and then enter the converter for smelting.
Preferably, oxygen is introduced into the pyrolysis gasifier to maintain an oxygen-deficient environment in the pyrolysis gasifier.
In conclusion, the beneficial effects of the invention are as follows:
1. the industrial hazardous waste is subjected to crushing, magnetic separation, pyrolysis and twice homogenization compatibility pretreatment processes, so that the components and properties of the industrial hazardous waste to be treated are stable, the industrial hazardous waste can adapt to different characteristics of various industrial hazardous wastes, and the influence of harmful elements in the industrial hazardous waste on molten iron is effectively controlled.
2. After the industrial hazardous waste is subjected to pyrolysis pretreatment, harmful substances are preliminarily degraded, organic matters and water are removed, and pyrolysis slag components mainly comprise inorganic mineral components including CaO, MgO and SiO2And metal elements such as Fe, Cr, Ni, Co and the like, the properties of the pyrolysis slag are stable, and the dangerous characteristics are obviously reduced. And then the steel mill production equipment is cooperatively treated, so that the influence on the original production system can be obviously reduced.
3. The gas generated by pyrolysis is subjected to high-temperature secondary treatment in hot blast furnaces and blast furnace equipment, the temperature can reach as high as 2000 ℃, so that organic matters are thoroughly decomposed, the generation of dioxin is avoided, and meanwhile, heat energy in industrial hazardous wastes is recovered.
4. The method utilizes the blast furnace gas or converter gas of the steel mill as the starting heating source for the pyrolysis of the industrial hazardous waste and the supplementary heat source for the treatment of the low-heat value waste, does not need additional energy sources, and fully utilizes the heat energy in the steel-making process.
5. The Ca and Mg mineral components in the industrial hazardous waste can reduce the melting temperature and promote the slagging of the blast furnace. The proper Si content can ensure the drum strength of the sinter. Part of Fe, Cr, Ni and Co metal is reduced and enters the molten iron, and the resource recycling is realized.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
FIG. 2 is a flow chart of the system of the present invention.
Detailed Description
The industrial hazardous waste in the invention comprises organic hazardous waste generated by chemical industry, medicine, petrifaction and coating, environmental protection enterprises, and inorganic hazardous waste such as electroplating sludge, metallurgy and chromium slag.
As shown in fig. 1, a method for disposing industrial hazardous waste cooperatively by using a steel mill kiln, the method comprises the following steps:
1) detecting the collected industrial hazardous waste, and storing the industrial hazardous waste in a classified manner according to the calorific value, the harmful substances and the hazardous characteristics;
2) industrial hazardous wastes such as chromium-containing sludge, paint slag, tar slag and the like are respectively put into a crusher to be crushed according to batches, iron materials in the industrial hazardous wastes are separated by a magnetic separator, the iron materials are pressed into blocks and packaged after being collected, and made into raw materials meeting the requirement of the feeding specification, and the raw materials are put into a converter or an electric furnace to be smelted to replace part of iron ore and waste iron raw materials;
3) the industrial hazardous waste after magnetic separation and iron removal enters different material pits according to the heat value, the water content and the element content;
4) sending the industrial hazardous waste from each material pit into a feeding pool, uniformly mixing, and carrying out primary homogenization and compatibility to obtain the waste to be fed, which has a calorific value of about 3500 kcal, a water content of 45 percent and moderate harmful element content (does not influence the quality of molten steel);
5) feeding waste to be fed in a feeding pool into a pyrolysis gasification furnace, using part of coal gas generated by a steel mill such as blast furnace coal gas, coke oven gas and the like as a starting heating source and a supplementary heat source during low-calorific-value waste treatment, blowing a proper amount of oxygen, keeping the anoxic atmosphere in the furnace, and controlling the temperature of the pyrolysis furnace within the range of 800 ℃;
6) collecting pyrolysis gas as fuel, introducing the pyrolysis gas into a hot blast stove of a blast furnace for burning, completely decomposing organic matters, and discharging generated hot air into the blast furnace from the bottom together with blast furnace gas;
7) the method comprises the steps of sampling and analyzing mineral phases and harmful element contents in the pyrolysis slag, and performing secondary homogenization compatibility on the pyrolysis slag and sintering raw materials such as iron ore powder, coke powder and limestone powder according to the restriction requirement of a steelmaking process on element components, wherein the pyrolysis slag accounts for 3.5 wt%, the iron ore powder accounts for 61 wt%, the coke powder accounts for 4 wt%, the return ores account for 17 wt%, and the limestone powder accounts for 14.5 wt%. And (3) sintering the pyrolysis slag and other raw materials together, controlling the alkalinity of the sintering ore to be 1.8-2.0, and feeding the sintering ore into a blast furnace from the upper part through a feeding system for iron making. Controlling the alkalinity of the sintered ore to be 1.8-2.0, then mixing and sintering, and putting the sintered ore into a blast furnace for high-temperature melting treatment; the high-temperature melted substances enter high-pyrolysis slag to be used as return ores to enter a sintering machine, or to be used as raw materials of building material industries such as cement, aggregate, ballast, highway subgrade and the like to be comprehensively utilized.
As shown in fig. 2, a system for co-processing industrial hazardous waste by using a steel mill kiln comprises a crusher 1, a magnetic separation processing device 2, a homogenization compatibility device 3, a pyrolysis gasifier 4, a hot blast stove 5, a sintering machine 6 and a blast furnace 7; respectively putting the collected and classified industrial hazardous wastes into a crusher 1 for crushing, wherein a discharge port of the crusher 1 is connected with a magnetic separation treatment device 2 through a pipeline, the magnetic separation treatment device 2 is connected with a material pit, the material pit is connected with a feeding pool through a grab bucket for grabbing the wastes, and a homogenizing compatibility device 3 is arranged in the feeding pool; the crushed waste is subjected to magnetic separation treatment in a magnetic separation treatment device 2, the industrial hazardous waste after iron removal enters different material pits according to the calorific value, the water content and the element content, and more than five material pits are arranged and temporarily store high-calorific-value high-hazardous substances, high-calorific-value low-hazardous substances, low-calorific-value high-hazardous substances, low-calorific-value low-hazardous substances and medium-calorific-value medium-hazardous substances respectively. Grabbing industrial hazardous wastes from each material pit to a feeding pool by a grab bucket, and carrying out primary homogenization and compatibility on the industrial hazardous wastes through a homogenization and compatibility device 3 according to the heat value, the water content and the element content; the homogenizing compatibility device 3 is connected with the pyrolysis gasifier 4 through a pipeline and a pump, industrial hazardous wastes after homogenizing compatibility are thrown into the pyrolysis gasifier 4 through a grab bucket or a solid pump for pretreatment, and oxygen is introduced into the pyrolysis gasifier 4 to keep the interior of the pyrolysis gasifier 4 in an anoxic environment. The upper part of the pyrolysis gasifier 4 is connected with a hot blast stove 5 through an air pipe, the lower part of the pyrolysis gasifier 4 is connected with a sintering machine 6 through a pipeline, and the sintering machine 6 is connected with a blast furnace 7 through a pipeline; pyrolysis gas generated by pyrolysis of solid waste gas is taken as fuel and conveyed into a hot blast stove 5 of a blast furnace 7 for incineration, and generated hot air enters the blast furnace from the bottom and is discharged together with blast furnace gas; and (3) putting pyrolysis slag obtained after pyrolysis of the solid waste gas into a sintering machine 6, mixing the pyrolysis slag with the raw materials in the sintering machine 6, sintering the raw materials and the pyrolysis slag into blocks, and putting the blocks into a blast furnace 7 for high-temperature melting treatment.
The invention has the following advantages:
1. the industrial hazardous waste is subjected to crushing, magnetic separation, pyrolysis and twice homogenization compatibility pretreatment processes, so that the components and properties of the industrial hazardous waste to be treated are stable, the industrial hazardous waste can adapt to different characteristics of various industrial hazardous wastes, and the influence of harmful elements in the industrial hazardous waste on molten iron is effectively controlled.
2. After the industrial hazardous waste is subjected to pyrolysis pretreatment, harmful substances are preliminarily degraded, organic matters and water are removed, the property of pyrolysis slag is stable, the dangerous characteristic is obviously reduced, and then the industrial hazardous waste enters steel plant production equipment to be treated in a synergic manner, so that the influence on the original production system can be obviously reduced.
3. The gas generated by pyrolysis is subjected to high-temperature secondary treatment in hot blast furnaces and blast furnace equipment, the temperature can reach as high as 2000 ℃, so that organic matters are thoroughly decomposed, the generation of dioxin is avoided, and meanwhile, heat energy in industrial hazardous wastes is recovered.
4. The method utilizes the blast furnace gas or converter gas of the steel mill as the starting heating source for the pyrolysis of the industrial hazardous waste and the supplementary heat source for the treatment of the low-heat value waste, does not need additional energy sources, and fully utilizes the heat energy in the steel-making process.
5. Metal resources such as Fe, Cr, Ni, Co and the like in the industrial hazardous waste are reduced in the blast furnace and enter the molten iron, so that the valuable resources are recycled.
Claims (10)
1. A method for cooperatively treating industrial hazardous waste by utilizing a steel mill kiln is characterized by comprising the following steps:
1) detecting the collected industrial hazardous waste, and storing the industrial hazardous waste in a classified manner according to the calorific value, the harmful substances and the hazardous characteristics, wherein the industrial hazardous waste comprises organic hazardous waste, metal waste and other inorganic hazardous waste except metal generated by industrial enterprises;
2) respectively putting industrial hazardous wastes into a crusher in batches for crushing, and separating iron materials from the industrial hazardous wastes through a magnetic separator;
3) the industrial hazardous waste after magnetic separation and iron removal enters different material pits according to the heat value, the water content and the element content;
4) sending the industrial hazardous waste from each material pit into a feeding pool, uniformly mixing, and carrying out primary homogenization and compatibility to obtain waste to be fed, wherein the heat value of the waste is more than 3000 kilocalories, the water content of the waste is less than 50%, and the content of harmful elements is moderate;
5) feeding waste to be fed in a feeding pool into a pyrolysis gasification furnace, blowing a proper amount of oxygen, maintaining the oxygen-deficient atmosphere in the furnace, and controlling the temperature of the pyrolysis furnace within the range of 300-1000 ℃;
6) collecting pyrolysis gas as fuel, introducing the pyrolysis gas into a hot blast stove of a blast furnace for burning, completely decomposing organic matters, and discharging generated hot air into the blast furnace from the bottom together with blast furnace gas;
7) sampling the pyrolysis slag to analyze the content of mineral phases and harmful elements in the pyrolysis slag, performing secondary homogenization compatibility on the pyrolysis slag and a steel-making sintering raw material according to the limitation requirement of a steel-making process on element components, controlling the alkalinity of sintering ore to be 1.8-2.0 according to the addition proportion of the pyrolysis slag to be 0.5-8 wt%, then performing mixed sintering, and putting the sintering ore into a blast furnace for high-temperature melting treatment.
2. The method as claimed in claim 1, wherein the industrial hazardous waste includes organic hazardous waste and inorganic hazardous waste such as electroplating sludge, metallurgy and chrome slag generated by chemical industry, medicine, petrifaction, coating, and environmental protection enterprises.
3. The method of claim 1, wherein the iron separated by the magnetic separation in the step 2) is collected, briquetted and packaged to prepare raw materials meeting the requirement of the feeding specification, and the raw materials are put into a converter or an electric furnace for smelting to replace part of iron ore and waste iron raw materials.
4. The method according to claim 1, wherein the step 5) uses a part of gas generated from steel plants such as blast furnace gas, coke oven gas and the like as a supplementary heat source for starting the temperature raising and the treatment of low calorific value waste.
5. The method according to claim 1, wherein the high-temperature molten substance in the step 7) enters high-pyrolysis slag, and enters a sintering machine as return ores or is comprehensively utilized as raw materials in building material industries such as cement, aggregate, ballast, highway subgrade and the like.
6. A system for cooperatively treating industrial hazardous wastes by utilizing a steel mill kiln is characterized by comprising a crusher (1), magnetic separation treatment equipment (2), homogenization compatibility equipment (3), a pyrolysis gasification furnace (4), a hot blast stove (5), a sintering machine (6) and a blast furnace (7); respectively putting the collected and classified industrial hazardous wastes into a crusher (1) for crushing, connecting a discharge port of the crusher (1) with magnetic separation treatment equipment (2) through a pipeline, connecting the magnetic separation treatment equipment (2) with a material pit, connecting the material pit with a feeding pool through a grab bucket for grabbing the wastes, and arranging homogenization compatibility equipment (3) in the feeding pool; carrying out magnetic separation treatment on the crushed waste in magnetic separation treatment equipment (2), feeding the industrial hazardous waste subjected to iron removal into different material pits according to the heat value, the water content and the element content, grabbing the industrial hazardous waste from each material pit to a feeding pool by a grab bucket, and carrying out primary homogenization compatibility on the industrial hazardous waste according to the heat value, the water content and the element content by homogenization compatibility equipment (3); the homogenizing and compatibility device (3) is connected with the pyrolysis gasifier (4) through a pipeline and a pump, industrial hazardous wastes subjected to homogenizing and compatibility are thrown into the pyrolysis gasifier (4) through a grab bucket or a solid pump for pretreatment, the upper part of the pyrolysis gasifier (4) is connected with the hot blast stove (5) through an air pipe, the lower part of the pyrolysis gasifier (4) is connected with the sintering machine (6) through a pipeline, and the sintering machine (6) is connected with the blast furnace (7) through a pipeline; pyrolysis gas generated by pyrolysis of solid waste gas is taken as fuel and conveyed into a hot blast stove (5) of a blast furnace (7) for burning, and the generated hot blast enters the blast furnace from the bottom and is discharged together with blast furnace gas; and (3) putting pyrolysis slag obtained after pyrolysis of the solid waste gas into a sintering machine (6), mixing the pyrolysis slag with raw materials in the sintering machine (6), sintering the raw materials and the pyrolysis slag into blocks, and putting the blocks into a blast furnace (7) for high-temperature melting treatment.
7. The system for the cooperative disposal of industrial hazardous wastes through steel mill furnaces and kilns as claimed in claim 6, wherein the industrial hazardous wastes include organic hazardous wastes and electroplating sludge, metallurgy and chromium slag inorganic hazardous wastes generated by industrial enterprises.
8. The system for the cooperative disposal of the industrial hazardous waste by using the steel mill furnace according to claim 6, wherein five or more material pits are provided to temporarily store the high calorific value high hazardous substance, the high calorific value low hazardous substance, the low calorific value high hazardous substance, the low calorific value low hazardous substance and the medium calorific value medium hazardous substance, respectively.
9. The system for utilizing the steel mill kiln to cooperatively dispose the industrial hazardous wastes according to claim 6, wherein the magnetic separation treatment device (2) is connected with the converter through a pipeline, and after the iron materials separated by the magnetic separation treatment device (2) are collected, the iron materials are pressed into blocks and packaged to enter the converter for smelting.
10. The system for the cooperative disposal of the industrial hazardous waste by the steel mill kiln as claimed in claim 6, wherein the pyrolysis gasifier (4) is filled with oxygen to maintain an oxygen-deficient environment in the pyrolysis gasifier (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010854456.XA CN112113223B (en) | 2020-08-24 | 2020-08-24 | Method for cooperatively disposing industrial dangerous waste by utilizing steel mill kiln |
Applications Claiming Priority (1)
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| CN112923369A (en) * | 2021-02-04 | 2021-06-08 | 上海电气集团股份有限公司 | Method and device for cooperatively treating hazardous waste by using cement kiln |
| CN113122709A (en) * | 2021-04-16 | 2021-07-16 | 中冶长天国际工程有限责任公司 | Solid waste, sintering and pelletizing cooperative treatment process for guaranteeing iron grade |
| CN113154396A (en) * | 2021-04-16 | 2021-07-23 | 中冶长天国际工程有限责任公司 | Solid waste, sintering and pellet cooperative treatment process based on reasonable water control |
| CN113151675A (en) * | 2021-04-16 | 2021-07-23 | 中冶长天国际工程有限责任公司 | Solid waste synergistic sintering and pelletizing treatment process |
| CN113172071A (en) * | 2021-04-16 | 2021-07-27 | 中冶长天国际工程有限责任公司 | Solid waste and high-water-content ore based cooperative treatment process |
| CN113172072A (en) * | 2021-04-16 | 2021-07-27 | 中冶长天国际工程有限责任公司 | Solid waste disposal process centering on sintering and pelletizing processes |
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| CN112923369A (en) * | 2021-02-04 | 2021-06-08 | 上海电气集团股份有限公司 | Method and device for cooperatively treating hazardous waste by using cement kiln |
| CN112923369B (en) * | 2021-02-04 | 2024-03-12 | 上海电气集团股份有限公司 | Method and device for cooperatively disposing dangerous waste by cement kiln |
| CN115178467A (en) * | 2021-04-02 | 2022-10-14 | 中冶长天国际工程有限责任公司 | Lump ore pretreatment system and pretreatment method based on shaft tube type rotary kiln |
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| CN113151675A (en) * | 2021-04-16 | 2021-07-23 | 中冶长天国际工程有限责任公司 | Solid waste synergistic sintering and pelletizing treatment process |
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| CN113897470A (en) * | 2021-08-23 | 2022-01-07 | 浙江省工业设计研究院有限公司 | Novel process method for cooperatively treating hazardous waste hw18 by converter |
| CN114317956A (en) * | 2021-08-23 | 2022-04-12 | 浙江省工业设计研究院有限公司 | Novel process method for cooperatively treating iron hazardous waste briquettes by converter |
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