CN112981027A - Direct smelting process device for iron-containing zinc-containing solid waste in iron and steel plant - Google Patents
Direct smelting process device for iron-containing zinc-containing solid waste in iron and steel plant Download PDFInfo
- Publication number
- CN112981027A CN112981027A CN202110249675.XA CN202110249675A CN112981027A CN 112981027 A CN112981027 A CN 112981027A CN 202110249675 A CN202110249675 A CN 202110249675A CN 112981027 A CN112981027 A CN 112981027A
- Authority
- CN
- China
- Prior art keywords
- iron
- direct smelting
- zinc
- coal
- powder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B11/00—Making pig-iron other than in blast furnaces
-
- 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
- C22B13/00—Obtaining lead
- C22B13/02—Obtaining lead by dry processes
- C22B13/025—Recovery from waste materials
-
- 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
- C22B19/00—Obtaining zinc or zinc oxide
-
- 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
- C22B5/00—General methods of reducing to metals
- C22B5/02—Dry methods smelting of sulfides or formation of mattes
- C22B5/10—Dry methods smelting of sulfides or formation of mattes by solid carbonaceous reducing agents
-
- 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
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
- C21B2100/44—Removing particles, e.g. by scrubbing, dedusting
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
- C21B2100/66—Heat exchange
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/80—Interaction of exhaust gases produced during the manufacture of iron or steel with other processes
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
A direct smelting process device for iron-containing and zinc-containing solid waste of an iron and steel plant belongs to the technical field of resource treatment of iron-containing and zinc-containing solid waste of the iron and steel plant. The system comprises a direct smelting furnace, a water-cooling flue, a gravity dust collector, a high-temperature cyclone, a waste heat boiler, a bag-type dust collector, a pressure reducing valve bank, a gas pipe network, a molten iron treatment system, a water slag flushing system, a hot blast furnace, an iron-containing powder and dolomite bin, an iron-containing powder mixing and granulating device, an iron-containing powder preheating device, a granulated coal preparation system, a raw coal bin, a lime bin, a hot powder injection system, a granulated coal injection system and a lime injection system. The method has the advantages that the defects of complex flow, high investment and the like are overcome; the method has the advantages of no use of coke, no need of agglomeration of raw materials, cleanness, environmental protection, simple process, production of liquid molten iron and comprehensive recovery of valuable elements such as zinc, lead and the like.
Description
Technical Field
The invention belongs to the technical field of resource treatment of iron and zinc-containing solid wastes of iron and steel plants, and particularly relates to a direct smelting process device for iron and zinc-containing solid wastes of the iron and steel plants, which can be used for directly smelting the iron and zinc-containing solid wastes of the iron and steel plants without using coke.
Background
The iron-containing and zinc-containing solid waste in the steel production process mainly comes from dust removal and waste water treatment processes of various working procedures such as sintering, pelletizing, smelting, rolling and the like, has the characteristics of large quantity, various types, complex components, large fluctuation and the like, generally has the TFe content of 30-70 percent, and is rich in valuable elements such as Zn, Pb, K, Na, C and the like, so the waste needs to be recycled. The core of the resource utilization of the dust lies in fully recycling the elements such as iron, valuable metals and carbon in the dust and simultaneously separating and comprehensively utilizing the harmful factors which can not be recycled in the steel production.
The existing dust and mud utilization approaches of iron and steel enterprises in China mainly adopt low-Zn dust and mud to be sintered and high-Zn dust and mud to be sold or buried externally, so that the requirements of clean, efficient and resource production cannot be met, and the serious adverse effect is brought to blast furnace smelting. The rotary hearth furnace process can realize the comprehensive utilization of Fe, Zn, C and the like, and is developed to a certain extent in recent years, but simultaneously has the problems of low product reduction degree, poor quality, high investment, high operation cost and the like. The Oxycup and DK method has a long-term application practice for treating the solid waste in the steel plant, the product is molten iron, the molten iron can be used for converter steelmaking after pretreatment, and byproducts of high-calorific-value coal gas, slag and zinc-rich dust can be generated at the same time, but the defects exist, such as the Oxycup process needs to use large blocks of metallurgical coke, the equipment operation period is short, the maintenance workload is large, and the DK method uses a sintering agglomeration process, so that the defects of large pollution, high energy consumption and the like are overcome.
CN103614562A discloses a "process method for treating solid waste in iron and steel plant by using melting furnace", the method is characterized by that firstly making solid waste undergo the process of supercooling/hot agglomeration, then adding the solid waste together with coke into melting furnace so as to produce molten iron, at the same time can recover zinc and lead and purify the product. The method can obtain molten iron, recover useful elements at the same time, but use coke, and has the disadvantages of long flow and great pollution in the hot briquetting process.
CN109097588A discloses a "device and method for resource utilization of iron-containing and zinc-containing solid waste", the method presses the solid waste together with coke powder and binder into balls, then pre-reduces, and then adds the balls and coke together into a final reduction smelting furnace, so as to produce molten iron and slag and recover zinc oxide.
Disclosure of Invention
The invention aims to provide a direct smelting process device for iron-containing zinc-containing solid waste in a steel plant, which overcomes the defects of complex flow, high investment and the like; the method has the advantages of no use of coke, no need of agglomeration of raw materials, cleanness, environmental protection, simple process, production of liquid molten iron and comprehensive recovery of valuable elements such as zinc, lead and the like.
The device comprises a direct smelting furnace 1, a water-cooling flue 2, a gravity dust collector 3, a high-temperature cyclone 4, a waste heat boiler 5, a bag-type dust collector 6, a pressure reducing valve bank 7, a gas pipe network 8, a molten iron treatment system 9, a water slag flushing system 10, a hot blast furnace (or an oxygen pipeline) 11, an iron-containing powder and dolomite bin 12, an iron-containing powder mixing and granulating device 13, an iron-containing powder preheating device 14, a granulated coal preparation system 15, a raw coal bin 16, a lime bin 17, a hot powder injection system 18, a granulated coal injection system 19 and a lime injection system 20. The iron-containing powder and dolomite bin 12 is connected with an iron-containing powder mixing and granulating device 13 through a belt conveyor, the iron-containing powder mixing and granulating device 13 is connected with an iron-containing powder preheating device 14 through the belt conveyor, the outlet of the iron-containing powder preheating device 14 is connected with a hot powder injection system 18, the hot powder injection system 18 is connected with a direct smelting furnace 1 through a solid spray gun, a raw coal bin 16 is connected with a granular coal preparation system 15 through the belt conveyor, the outlet of the granular coal preparation system 15 is connected with a granular coal injection system 19, the granular coal injection system 19 is connected with the direct smelting furnace 1 through a solid spray gun, a lime bin 17 is communicated with a lime injection system 20 through a pipeline, the lime injection system 20 is connected with the direct smelting furnace 1 through the solid spray gun, a hot blast stove (or an oxygen pipeline) 11 is communicated with the direct smelting furnace 1 through a hot blast stove and a hot blast spray gun (or an oxygen spray gun), an outlet of the water-cooling flue 2 is communicated with an inlet of the gravity dust collector 3, an outlet of the gravity dust collector 3 is communicated with an inlet of the high-temperature cyclone 4, an outlet of the high-temperature cyclone 4 is communicated with an inlet of the waste heat boiler 5, an outlet of the waste heat boiler 5 is communicated with an inlet of the bag-type dust collector 6, an outlet of the bag-type dust collector 5 is communicated with the pressure reducing valve group 7, and an outlet of the pressure reducing valve group 7 is communicated with the gas pipe network 8; the direct smelting furnace 1 is respectively connected with a water slag flushing system 10 and a molten iron treatment system 9 through a slag hole, a slag runner, an iron outlet and an iron runner.
The process steps and the controlled technical parameters of the direct smelting process of the iron-containing and zinc-containing solid waste in the iron and steel plant are as follows:
adding the iron-containing zinc-containing solid waste and dolomite into an iron-containing powder mixing device 13 according to the proportion of 100: 5-20, mixing uniformly, adding the mixture into an iron-containing powder preheating device through a belt conveyor, preheating the iron-containing powder to 800 ℃ in the preheating device, wherein fuel used by the preheating device is from cooled direct smelting furnace gas, and conveying the preheated iron-containing powder to a hot powder injection system bin; raw coal is conveyed to a raw coal bin of a coal injection system through a belt conveyor, and is conveyed to an injection tank of a granulated coal injection system after being crushed and dried, wherein the grain size of the granulated coal is less than or equal to 3 mm; and conveying the lime powder to a bin of a lime blowing system through a suction and discharge tank car.
Under the action of nitrogen carrier gas, iron-containing zinc-containing powder, granulated coal and lime powder are respectively injected into a slag iron molten pool in the direct smelting furnace through a hot powder injection pipeline, a lime injection pipeline and a granulated coal injection pipeline after being merged, iron oxide and zinc oxide in the molten pool are reduced by carbon elements dissolved in molten iron to generate liquid molten iron and molten slag, meanwhile, the zinc oxide is reduced into a zinc simple substance, and the zinc oxide is gasified at the furnace temperature of 1450-1650 ℃, enters into coal gas and is discharged out of the furnace along with the coal gas.
Hot air (or pure oxygen) with the oxygen content of 35-42 percent and the temperature of 1200 ℃ from the hot blast stove is sprayed into the furnace from the top of the direct smelting furnace through a hot air spray gun (or an oxygen spray gun), the oxygen-enriched hot air (or the pure oxygen) and the coal gas in the furnace are subjected to secondary combustion, heat is continuously provided for the molten pool, and the continuous operation of the molten pool reaction is maintained.
The molten iron and the molten slag are discharged out of the furnace through an iron notch and a slag notch respectively, the molten slag is quenched by water to obtain water-washed slag which can be used as a raw material for producing cement, and the molten iron is transported to a steel plant or cast iron.
The gas at 1450-1650 ℃ from the direct smelting furnace is cooled to 800-1000 ℃ through a water-cooling flue, and after being dedusted by a gravity deduster and a cyclone deduster, the dust content is 20-100 g/Nm3Reduced to 5-10 g/Nm3Further cooling to 180-3In the process of cooling the coal gas, the gaseous zinc simple substance is secondarily oxidized into solid zinc oxide, and is collected and recovered by a bag-type dust collector; one part of the purified gas is supplied to a hot blast stove as fuel, one part of the purified gas is supplied to an iron-containing powder preheater, and the rest of the purified gas enters a gas pipe network and is sent out.
The dust removed from gravity dust collector, high-temperature cyclone dust collector and waste heat boiler can be pneumatically conveyed to raw material yard by nitrogen gas, and mixed with iron-containing zinc-containing powder, and then the mixture is used as raw material to be smelted again.
The iron-containing powder preheating device can adopt a rotary kiln or a fluidized bed or other preheating devices.
The fuel used by the direct smelting furnace is anthracite or a mixture of anthracite and bituminous coal or coke powder.
The refractory material at the bottom of the direct smelting furnace is provided with a lead discharging seam, condensed liquid metal lead can be discharged through a lead discharging hole in the side wall of the hearth, and crude lead is obtained after collection.
The invention has the advantages that:
1. the process can directly use the iron-containing zinc-containing solid waste powder for smelting without cold pressing block or sintering agglomeration, can use full-powder coal for smelting, does not need coke, and saves sintering and coking, so the process flow is simple, and the process has the characteristics of low emission and environmental friendliness, and can realize clean smelting.
2. Because the whole powder is fed into the smelting furnace, the smelting efficiency of the smelting furnace is higher, and the dust solid waste generated by the process can be recycled by 100 percent.
3. Because the pelletizing property of the iron-containing and zinc-containing solid waste is poor, compared with a rotary hearth furnace and a DK process, the process greatly reduces the ore return rate in the raw material agglomeration process and improves the production efficiency.
4. The process can realize the recycling of the crude zinc powder, the dezincification rate reaches more than 95 percent, and simultaneously, pure liquid molten iron and water flushing slag are obtained, so that the resource efficient utilization of valuable elements such as iron-containing zinc-containing solid waste iron, zinc, lead and the like can be realized;
drawings
FIG. 1 is a schematic view of the structure of the apparatus of the present invention. The system comprises a direct smelting furnace 1, a water-cooling flue 2, a gravity dust collector 3, a high-temperature cyclone 4, a waste heat boiler 5, a bag-type dust collector 6, a pressure reducing valve bank 7, a gas pipe network 8, a molten iron treatment system 9, a water slag flushing system 10, a hot blast stove (or an oxygen pipeline) 11, an iron-containing powder and dolomite bin 12, an iron-containing powder mixing and granulating device 13, an iron-containing powder preheating device 14, a granulated coal preparation system 15, a raw coal bin 16, a lime bin 17, a hot powder injection system 18, a granulated coal injection system 19 and a lime injection system 20.
FIG. 2 is a flow chart of the direct smelting process of the iron-containing and zinc-containing solid waste materials in the steel plant provided by the invention.
Detailed Description
Fig. 1 and 2 show an embodiment of the present invention.
As shown in fig. 1, the apparatus of the present invention includes a direct smelting furnace 1, a water-cooled flue 2, a gravity dust collector 3, a high-temperature cyclone 4, a waste heat boiler 5, a bag-type dust collector 6, a pressure reducing valve bank 7, a gas pipe network 8, a molten iron treatment system 9, a water slag flushing system 10, a hot blast stove (or an oxygen pipeline) 11, an iron-containing powder and dolomite bin 12, an iron-containing powder blending and granulating device 13, an iron-containing powder preheating device 14, a granulated coal preparation system 15, a raw coal bin 16, a lime bin 17, a hot powder injection system 18, a granulated coal injection system 19, and a lime injection system 20. The iron-containing powder and dolomite bin 12 is connected with an iron-containing powder mixing and granulating device 13 through a belt conveyor, the iron-containing powder mixing and granulating device 13 is connected with an iron-containing powder preheating device 14 through the belt conveyor, the outlet of the iron-containing powder preheating device 14 is connected with a hot powder injection system 18, the hot powder injection system 18 is connected with a direct smelting furnace 1 through a solid spray gun, a raw coal bin 16 is connected with a granular coal preparation system 15 through the belt conveyor, the outlet of the granular coal preparation system 15 is connected with a granular coal injection system 19, the granular coal injection system 19 is connected with the direct smelting furnace 1 through a solid spray gun, a lime bin 17 is communicated with a lime injection system 20 through a pipeline, the lime injection system 20 is connected with the direct smelting furnace 1 through the solid spray gun, a hot blast stove (or an oxygen pipeline) 11 is communicated with the direct smelting furnace 1 through a hot blast stove and a hot blast spray gun (or an oxygen spray gun), an outlet of the water-cooling flue 2 is communicated with an inlet of the gravity dust collector 3, an outlet of the gravity dust collector 3 is communicated with an inlet of the high-temperature cyclone 4, an outlet of the high-temperature cyclone 4 is communicated with an inlet of the waste heat boiler 5, an outlet of the waste heat boiler 5 is communicated with an inlet of the bag-type dust collector 6, an outlet of the bag-type dust collector 5 is communicated with the pressure reducing valve group 7, and an outlet of the pressure reducing valve group 7 is communicated with the gas pipe network 8; the direct smelting furnace 1 is respectively connected with a water slag flushing system 10 and a molten iron treatment system 9 through a slag hole, a slag runner, an iron outlet and an iron runner.
The specific process flow of the present invention is shown in FIG. 2, and is further described below with reference to specific examples.
| Serial number | Variety of solid wastes | Ratio/% of | TFe | K2O | Na2O | Zn | Cl | C | SiO2 | CaO |
| 1 | Electric field ash for sintering and pelletizing | 1.6 | 25.01 | 18.82 | 1.74 | 0.18 | 14.87 | 1.56 | 2.15 | 7.09 |
| 2 | Blast furnace front ash | 6.4 | 50.19 | 1.10 | 0.77 | 0.58 | 0.30 | 20.18 | 2.45 | 1.76 |
| 3 | Cyclone ash of blast furnace | 18.0 | 46.50 | 0.70 | 1.47 | 0.23 | 0.63 | 24.19 | 9.88 | 5.09 |
| 4 | Fine ash for steel-smelting and steel-rolling | 16.2 | 54.70 | 1.54 | 0.76 | 3.87 | 0.92 | 0.80 | 1.67 | 8.04 |
| 5 | Secondary ash for steel-smelting and rolling | 6.3 | 30.89 | 2.46 | 1.05 | 4.40 | 1.97 | 2.26 | 4.10 | 17.59 |
| 6 | Iron scale | 27.2 | 66.26 | 0.4 | 0.3 | |||||
| 7 | Small grain slag steel | 24.3 | 40 | 0.1 | 0.3 | 0.35 |
Selecting 7 iron-containing and zinc-containing solid wastes in the table as raw materials, proportioning according to the proportion in the table, and mixing according to the furnace slag binary alkalinity of 1.2 and the quaternary alkalinity of 1.1850kg of iron-containing and zinc-containing solid waste, coal powder, lime powder and dolomite powder are determined according to the proportion per ton of iron-containing and zinc-containing solid waste. Mixing the iron-containing zinc-containing solid waste and dolomite, then preheating in a rotary kiln, heating to 750 ℃, and adding into a hot powder injection system through high-temperature bucket lifting; preparing the granulated coal with the granularity less than or equal to 3mm by the raw coal through a granulated coal preparation system; lime powder is converged with a hot powder injection system and a granulated coal preparation injection system through a lime injection system and then is injected into a molten pool in a direct smelting furnace through a solid material spray gun, part of carbon in coal powder is dissolved into molten iron to carburete the molten iron, the other part of carbon in the coal powder is reduced with iron ore powder to produce coal gas, zinc oxide in the raw material is reduced by the carbon to produce zinc steam to enter the coal gas, the coal gas is combusted with oxygen-enriched hot air with the oxygen content of 35 percent at 1200 ℃ from a hot blast stove in the rising process, the secondary combustion rate in the furnace is controlled to be 55 percent, the heat generated by the combustion of the coal gas is transferred to the molten iron molten pool through a slag layer, the zinc steam is secondarily oxidized into zinc oxide in the combustion and cooling process of the coal gas, the dust content of the coal gas of the direct smelting furnace containing the zinc oxide is reduced to 5mg/Nm after the coal3The temperature of the coal gas is reduced to 200 ℃; after the pressure of the purified gas is reduced, one part of the purified gas is supplied to a hot blast stove as fuel, one part of the purified gas is supplied to a rotary kiln, the rest of the purified gas is discharged into a gas pipe network, coarse zinc powder is collected by cloth bag dust removal and can be sold as a product, and other dust removal ash returns to a raw material yard to be smelted again. The lead port of the direct smelting furnace grate can discharge crude lead with lead content more than 97 percent in stages. The slag is discharged periodically through a slag hole, and the grain slag is obtained for sale through a water slag flushing system. The molten iron is discharged from the taphole and used as a steelmaking raw material.
Technical effects
1. The process can treat various dusts of iron and steel enterprises, can obtain high-temperature liquid molten iron and water slag by directly blowing the iron-containing zinc-containing solid waste powder and the pulverized coal into a smelting furnace on the premise of no need of coke and sintering, and can realize high-efficiency resource recycling of the iron-containing zinc-containing solid waste resources by recovering coarse zinc powder and coarse lead through dry dedusting;
2. the process has the technical characteristics of simple process flow, small occupied area, environmental protection and cleanness.
Claims (5)
1. A direct smelting process device for iron and zinc containing solid waste in a steel plant is characterized by comprising a direct smelting furnace (1), a water cooling flue (2), a gravity dust collector (3), a high-temperature cyclone (4), a waste heat boiler (5), a bag-type dust collector (6), a pressure reducing valve bank (7), a gas pipe network (8), a molten iron treatment system (9), a water slag flushing system (10), a hot blast furnace (11), an iron-containing powder and dolomite bin (12), an iron-containing powder mixing and granulating device (13), an iron-containing powder preheating device (14), a granulated coal preparation system (15), a raw coal bin (16), a lime bin (17), a hot powder injection system (18), a granulated coal injection system (19) and a lime injection system (20); the iron-containing powder and dolomite bin (12) is connected with an iron-containing powder mixing and granulating device (13) through a belt conveyor, the iron-containing powder mixing and granulating device (13) is connected with an iron-containing powder preheating device (14) through the belt conveyor, the outlet of the iron-containing powder preheating device (14) is connected with a hot powder injection system (18), the hot powder injection system (18) is connected with a direct smelting furnace (1) through a solid spray gun, a raw coal bin (16) is connected with a granulated coal preparation system (15) through the belt conveyor, the outlet of the granulated coal preparation system (15) is connected with a granulated coal injection system (19), the granulated coal injection system (19) is connected with the direct smelting furnace (1) through the solid spray gun, a lime bin (17) is communicated with the lime injection system (20) through a pipeline, the lime injection system (20) is connected with the direct smelting furnace (1) through the solid spray gun, the hot blast stove (11) is communicated with the direct smelting furnace (1) through a, a coal gas outlet of the direct smelting furnace (1) is communicated with an inlet of a water-cooling flue (2), an outlet of the water-cooling flue (2) is communicated with an inlet of a gravity dust collector (3), an outlet of the gravity dust collector (3) is communicated with an inlet of a high-temperature cyclone (4), an outlet of the high-temperature cyclone (4) is communicated with an inlet of a waste heat boiler (5), an outlet of the waste heat boiler (5) is communicated with an inlet of a bag-type dust collector (6), an outlet of the bag-type dust collector (5) is communicated with a pressure reducing valve group (7), and an outlet of the pressure reducing valve group (7) is communicated with a coal gas pipe network (8); the direct smelting furnace (1) is respectively connected with a water slag flushing system (10) and a molten iron treatment system (9) through a slag hole, a slag runner, an iron outlet and an iron runner.
2. The direct smelting process plant for iron and steel plant iron and zinc containing solid waste material according to claim 1, wherein the process steps and controlled technical parameters of the direct smelting process for iron and steel plant iron and zinc containing solid waste material are as follows:
adding the iron-containing zinc-containing solid waste and dolomite into an iron-containing powder mixing and granulating device (13) according to the proportion of 100: 5-20, uniformly mixing, adding the mixture into an iron-containing powder preheating device through a belt conveyor, preheating the iron-containing powder to 800 ℃ in the preheating device, wherein fuel used by the preheating device is from cooled direct smelting furnace gas, and conveying the preheated iron-containing powder to a hot powder injection system bin; raw coal is conveyed to a raw coal bin of a coal injection system through a belt conveyor, and is conveyed to an injection tank of a granulated coal injection system after being crushed and dried, wherein the grain size of the granulated coal is less than or equal to 3 mm; conveying the lime powder to a bin of a lime blowing system through a suction and discharge tank truck;
under the action of nitrogen carrier gas, iron-containing zinc-containing powder, granulated coal and lime powder are respectively sprayed into a slag iron molten pool in the direct smelting furnace through a hot powder injection pipeline, a lime injection pipeline and a granulated coal injection pipeline after being merged, iron oxide and zinc oxide in the molten pool are reduced by carbon elements dissolved in molten iron to generate liquid molten iron and molten slag, meanwhile, the zinc oxide is reduced into a zinc simple substance, and the zinc oxide is gasified at the furnace temperature of 1450-1650 ℃ and enters into coal gas and is discharged out of the furnace along with the coal gas;
hot air with the oxygen content of 35-42 percent and the temperature of 1200 ℃ from the hot blast stove is sprayed into the furnace from the top of the direct smelting furnace through a hot air spray gun or an oxygen spray gun, oxygen-enriched hot air or pure oxygen and coal gas in the furnace generate secondary combustion, heat is continuously provided for the molten pool, and the continuous operation of the molten pool reaction is maintained;
the molten iron and the molten slag are discharged out of the furnace through an iron notch and a slag notch respectively, the molten slag is quenched by water to obtain water-washed slag which is used as a raw material for producing cement, and the molten iron is transported to a steel plant or cast iron;
the gas at 1450-1650 ℃ from the direct smelting furnace is cooled to 800-1000 ℃ through a water-cooling flue, and after being dedusted by a gravity deduster and a cyclone deduster, the dust content is 20-100 g/Nm3Reduced to 5-10 g/Nm3Further cooling to 180-250 ℃ by a waste heat boiler, and reducing the dust content to 5 by a bag-type dust collectormg/Nm3In the process of cooling the coal gas, the gaseous zinc simple substance is secondarily oxidized into solid zinc oxide, and is collected and recovered by a bag-type dust collector; one part of the purified gas is supplied to a hot blast stove as fuel, the other part of the purified gas is supplied to an iron-containing powder preheater, and the rest of the purified gas enters a gas pipe network and is sent out;
the dust removed from gravity dust collector, high-temperature cyclone dust collector and waste heat boiler can be pneumatically conveyed to raw material yard by nitrogen gas, and mixed with iron-containing zinc-containing powder, and then the mixture is used as raw material to be smelted again.
3. The direct smelting process unit for iron and zinc containing solid waste materials in steel plants according to claim 1, characterized in that the iron containing powder preheating device (14) is a rotary kiln or a fluidized bed.
4. The direct smelting process unit of iron and zinc containing solid wastes from steel plants according to claim 1, characterized in that the fuel used in the direct smelting furnace (1) is anthracite or a mixture of anthracite and bituminous coal or coke breeze.
5. The direct smelting process unit of the iron and zinc containing solid wastes of the steel plant according to the claim 1, characterized in that the refractory material at the bottom of the direct smelting furnace (1) is provided with a lead discharging slot, the condensed liquid metal lead is discharged through the lead discharging hole at the side wall of the hearth, and the lead bullion is obtained after the lead is collected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110249675.XA CN112981027A (en) | 2021-03-05 | 2021-03-05 | Direct smelting process device for iron-containing zinc-containing solid waste in iron and steel plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110249675.XA CN112981027A (en) | 2021-03-05 | 2021-03-05 | Direct smelting process device for iron-containing zinc-containing solid waste in iron and steel plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112981027A true CN112981027A (en) | 2021-06-18 |
Family
ID=76336481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110249675.XA Pending CN112981027A (en) | 2021-03-05 | 2021-03-05 | Direct smelting process device for iron-containing zinc-containing solid waste in iron and steel plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112981027A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113526896A (en) * | 2021-07-14 | 2021-10-22 | 北京科技大学 | Method for treating waste incineration fly ash and preparing solid waste base gel material by using same |
| CN114657386A (en) * | 2022-03-20 | 2022-06-24 | 北京首钢国际工程技术有限公司 | Treatment device and method for solid waste of steel plant |
| CN114892006A (en) * | 2022-05-17 | 2022-08-12 | 宝武集团环境资源科技有限公司 | Method and system for treating oil-containing muddy water of rolled steel by rotary hearth furnace |
| CN117004784A (en) * | 2023-10-07 | 2023-11-07 | 山西建龙实业有限公司 | Preheating system of nitrogen for blast furnace pulverized coal injection |
-
2021
- 2021-03-05 CN CN202110249675.XA patent/CN112981027A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113526896A (en) * | 2021-07-14 | 2021-10-22 | 北京科技大学 | Method for treating waste incineration fly ash and preparing solid waste base gel material by using same |
| CN114657386A (en) * | 2022-03-20 | 2022-06-24 | 北京首钢国际工程技术有限公司 | Treatment device and method for solid waste of steel plant |
| CN114892006A (en) * | 2022-05-17 | 2022-08-12 | 宝武集团环境资源科技有限公司 | Method and system for treating oil-containing muddy water of rolled steel by rotary hearth furnace |
| CN117004784A (en) * | 2023-10-07 | 2023-11-07 | 山西建龙实业有限公司 | Preheating system of nitrogen for blast furnace pulverized coal injection |
| CN117004784B (en) * | 2023-10-07 | 2023-11-28 | 山西建龙实业有限公司 | Preheating system of nitrogen for blast furnace pulverized coal injection |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112981027A (en) | Direct smelting process device for iron-containing zinc-containing solid waste in iron and steel plant | |
| CN106367600A (en) | Method for treating high-zinc iron-containing slime through utilizing rotary kiln | |
| CN112442589B (en) | Method and system for co-processing waste incineration fly ash and zinc-containing dust and mud of iron and steel plant | |
| CN102534199B (en) | Comprehensive utilization process of zinc-containing iron dust | |
| CN104212930B (en) | A kind of BAOSHEREX iron-smelting process of two-step smelting molten iron | |
| CN112111656B (en) | Method for co-processing zinc-containing and iron-containing dust by blast furnace and rotary kiln | |
| CN106893867B (en) | A kind of method of the muffle shaft furnace processing dirt of feed powder containing zinc-iron recycling zinc | |
| CN104404189B (en) | Utilize the method that chromite powder two-step method melting and reducing produces ferrochrome | |
| CN114672643B (en) | Method for synergistically utilizing high-iron red mud and molten steel slag | |
| CN106868245B (en) | A kind of molten iron making processes of two-step method | |
| CN101709341A (en) | Method for treating iron-containing waste materials in iron and steel plant | |
| CN214694260U (en) | Direct smelting process device for iron-containing zinc-containing solid waste in iron and steel plant | |
| CN112195301B (en) | Direct reduction-melting separation system and method | |
| CN112267021A (en) | System and method for coprocessing zinc-containing dust and molten steel slag | |
| CN113699370A (en) | Process for producing semisteel by coal-based hydrogen metallurgy, hot agglomeration and electric furnace in iron ore concentrate rotary kiln | |
| CN111748686A (en) | Process for producing metallized furnace charge by directly reducing nonferrous smelting slag | |
| CN108690896A (en) | A kind of high intensity short route melting, reducing and smelting device and method | |
| CN107779534B (en) | Process for treating zinc-containing and iron dust and mud in iron and steel plant by shaft furnace method | |
| CN108754056A (en) | A kind of high density total oxygen short flow high efficiency cleaning iron-smelting process | |
| CN103952540B (en) | Ion dust mud contaning and high silicon iron concentrate is utilized to produce the technique of prereduced burden | |
| CN103966380A (en) | Method for recycling dedusted powder in shaft furnace top gas | |
| CN113088611B (en) | Pure oxygen two-stage preheating reduction iron-making process | |
| CN110616334B (en) | Method for cooperatively treating semicoke and zinc-containing dust | |
| CN110184405B (en) | Method and device for producing molten iron by adopting acidic carbon-containing metallized pellets | |
| CN206256139U (en) | The system for processing zinc leaching residue |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |