CN113637852A - Method for recovering iron and zinc from dust and low-carbon sludge collected from steel plant - Google Patents
Method for recovering iron and zinc from dust and low-carbon sludge collected from steel plant Download PDFInfo
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 127
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 64
- 239000000428 dust Substances 0.000 title claims abstract description 52
- 239000011701 zinc Substances 0.000 title claims abstract description 51
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 49
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 35
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 33
- 239000010959 steel Substances 0.000 title claims abstract description 33
- 239000010802 sludge Substances 0.000 title claims abstract description 31
- 239000000463 material Substances 0.000 claims abstract description 92
- 238000001816 cooling Methods 0.000 claims abstract description 18
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 7
- 230000023556 desulfurization Effects 0.000 claims abstract description 7
- 238000005406 washing Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 25
- 238000002156 mixing Methods 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 11
- 239000007921 spray Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 7
- 239000011230 binding agent Substances 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 241000196324 Embryophyta Species 0.000 claims 2
- 241001232253 Xanthisma spinulosum Species 0.000 claims 2
- 229920005596 polymer binder Polymers 0.000 claims 2
- 239000002491 polymer binding agent Substances 0.000 claims 2
- 239000002817 coal dust Substances 0.000 claims 1
- 231100000252 nontoxic Toxicity 0.000 claims 1
- 230000003000 nontoxic effect Effects 0.000 claims 1
- 239000002893 slag Substances 0.000 abstract description 18
- 239000000843 powder Substances 0.000 abstract description 11
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical group [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 abstract description 8
- 238000004064 recycling Methods 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 4
- 239000002910 solid waste Substances 0.000 abstract description 4
- 230000006978 adaptation Effects 0.000 abstract description 2
- 239000000853 adhesive Substances 0.000 description 8
- 230000001070 adhesive effect Effects 0.000 description 8
- 229920000642 polymer Polymers 0.000 description 7
- 239000008188 pellet Substances 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000005245 sintering Methods 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000007363 ring formation reaction Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Classifications
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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
- 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
- C22B7/02—Working-up flue dust
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0066—Preliminary conditioning of the solid carbonaceous reductant
-
- 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
-
- 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
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
-
- 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
- C22B19/30—Obtaining zinc or zinc oxide from metallic residues or scraps
-
- 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
- C22B19/34—Obtaining zinc oxide
- C22B19/38—Obtaining zinc oxide in rotary 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
- 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
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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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Geology (AREA)
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Abstract
The invention relates to the technical field of environment-friendly recycling of solid wastes of iron and steel plants, in particular to a method for recycling iron and zinc from dust and low-carbon sludge of the iron and steel plants. According to the invention, through optimizing the material proportion, the iron is enriched and dezincification is carried out by roasting in the rotary kiln, the roasting escape rate of zinc in the material can reach more than 95%, the iron content in the enriched iron slag is more than 62%, and the zinc content is lower than 0.15%; and cooling the roasting tail gas of the rotary kiln to remove dust and collect zinc, wherein the temperature of the roasting tail gas of the rotary kiln is 600-800 ℃, the roasting tail gas is cooled to 200-300 ℃ through heat exchange to collect dust, the obtained dust collection powder is zinc oxide powder with the content of 50-60%, and the tail gas is discharged after washing and desulfurization to reach the standard. Aiming at the technical defects of the prior pyrometallurgical treatment of solid wastes in steel plants, the invention provides a comprehensive utilization method which is simple in operation, strong in applicability and capable of effectively recovering iron and zinc and is obtained by combining technological parameter adjustment and equipment adaptation conditions.
Description
Technical Field
The invention relates to the technical field of environment-friendly recycling of solid wastes of iron and steel plants, in particular to a method for recycling iron and zinc from dust and low-carbon sludge of the iron and steel plants.
Background
With the development of the steel industry in China, the resource recycling of iron and zinc in a large amount of dust and low-carbon sludge (the dust and the low-carbon sludge are derived from the dust collection of converter steelmaking tail gas and the dust collection of blast furnace ironmaking tail gas) in steel plants is a requirement for environmental protection and improvement of resource utilization efficiency. The domestic disposal methods for the dust and the low-carbon sludge in the steel mill include a rotary hearth furnace baking and winding process, a belt type sintering process and a rotary kiln baking process.
The existing rotary hearth furnace technology directly lays a material layer with the thickness of 30-50mm on a refractory material, directly sprays the material on a pellet material layer by flame to heat the material, has lower heat transfer efficiency, and requires high equipment investment under operation control conditions. The belt sintering process is to heat the material with the height of 30-350mm in the material layer on the belt sintering roasting machine by using blast furnace gas, and integrates drying, reduction and roasting of the material, but has the advantages of large investment, small relative processing capacity and high comprehensive cost. The rotary kiln process is characterized in that powder or granulated powder is roasted by coal gas or pulverized coal spraying, most of the powder is roasted, the investment is low, the operation is simple, the operation cost is low, and the like, but the recovered zinc oxide powder is low in content, and the biggest defect is that the equipment cannot normally operate due to the fact that the material is easy to form a ring in the production process. Therefore, the existing methods for treating a large amount of dust and low-carbon sludge in steel plants have some technical defects, and further improvement is still needed.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a method for recovering iron and zinc from dust and low-carbon sludge in a steel plant, which comprises the following steps:
(1) mixing materials: adding dust and low-carbon sludge of a steel plant into a mixer according to a certain proportion, adding a proper amount of reduced carbon powder, adding 1-2% of adhesive according to the total amount of the materials, starting the mixer to uniformly mix the materials, and ensuring that the water content of the materials is 5-10% in the mixing process;
(2) material ball pressing, drying and dewatering: feeding the mixed materials into high-pressure ball-making equipment, making the diameter of the pressed ball be 30-50mm, drying the finished ball on a belt-type dryer until the water content is less than 1% and the compression strength of the dried ball is 70-100kN/cm2；
(3) Roasting the material ball in a rotary kiln to enrich iron and remove zinc: roasting the materials in a rotary kiln, controlling the roasting temperature of the materials to be 1000-1300 ℃, and roasting the materials for 1-2 hours, wherein the roasting escape rate of zinc in the materials can reach more than 95 percent by optimizing the material proportion, the iron content in the enriched iron slag is more than 62 percent, and the zinc content is less than 0.15 percent;
(4) cooling, dedusting and recovering zinc from roasting tail gas of a rotary kiln: the roasting tail gas temperature of the rotary kiln is 600-800 ℃, the obtained dust collecting powder is 50-60% of zinc oxide powder, the dust collecting tail gas is cooled to 200-300 ℃ through heat exchange, and the dust collecting tail gas is discharged after being washed and desulfurized to reach the standard.
Preferably, in the step (1), the ratio of the dust collection ash to the low carbon sludge to the reduced carbon powder is (4-6): (2-4): (0.5-1.5), and the ratio can ensure that enough reduced carbon can be obtained so that iron can be reduced and zinc can be removed by escaping.
Preferably, the reduced carbon powder in the step (1) is coke powder. The fixed carbon of the coke powder has high ash content and is suitable for matching with the components in the application.
Preferably, the binder in the step (1) is a high molecular polymer-based binder.
Preferably, the adhesive is a special high molecular polymer adhesive produced by Beijing Kogyu Co., Ltd, and has the performance of high temperature resistance, no toxicity, no harm and no residue.
Preferably, in the step (1), a proper amount of spray water is added according to the water content of the material in the mixing process, so as to ensure that the water content of the material is 5-10%.
Preferably, in the step (2), the rotary kiln roasting is to heat the inside of the rotary kiln by providing heat energy through gas or coal powder.
Compared with the prior art, the invention has the technical effects that:
(1) according to the invention, through optimizing the material proportion, the iron is enriched and the zinc is removed by roasting in the rotary kiln, the roasting escape rate of zinc in the material can reach more than 95%, the iron content in the enriched iron slag is more than 62%, and the zinc content is less than 0.15%.
(2) According to the invention, the zinc is collected by cooling and dedusting the roasting tail gas of the rotary kiln, the temperature of the roasting tail gas of the rotary kiln is 600-.
(3) Aiming at the technical defects of the prior pyrometallurgical treatment of solid wastes in steel plants, the invention provides a comprehensive utilization method which is simple in operation, strong in applicability and capable of effectively recovering iron and zinc by adopting technical parameter adjustment and equipment adaptation conditions, and has the most obvious effect of avoiding the ring formation of a rotary kiln.
Drawings
FIG. 1 is a schematic flow diagram of the present invention.
Detailed Description
The technical solution of the present invention is further defined below with reference to the specific embodiments, but the scope of the claims is not limited to the description.
The dust and low carbon sludge from a certain steel mill are used as raw materials
Dust collecting component
| Item | Zn | CaO | MgO | Fe | Al2O3 | Pb | K2O | Na2O | SiO2 | C |
| Dust collection ash% | 4.32 | 8.86 | 0.85 | 53.01 | 0.41 | 0.16 | 0.05 | 0.98 | 1.69 | 1.18 |
Low carbon content mud
| Item | Zn | CaO | MgO | Fe | Al2O3 | Pb | SiO2 | C |
| Low carbon mud% | 2.62 | 3.85 | 0.94 | 34.46 | 2.83 | 0.32 | 6.30 | 23.49 |
Example 1
A method for recovering iron and zinc from dust and low-carbon sludge of a steel plant comprises the following steps:
(1) mixing materials: adding the dust ash, the low-carbon sludge and the coke powder of the steel plant into a mixer according to the proportion of 5:3:0.5, adding 2% of high-molecular polymer adhesive according to the total amount of the materials, starting the mixer to uniformly mix the materials, and adding a proper amount of spray water according to the water content of the materials in the mixing process to ensure that the water content of the materials is 8.5%;
(2) material ball pressing, drying and dewatering: the mixed materials are sent into high-pressure ball-making equipment,the diameter of the pressed ball is 40mm, the finished ball is dried on a belt dryer until the moisture content is less than 1 percent, and the compressive strength of the dry ball is 70-100kN/cm2；
(3) Roasting the material ball in a rotary kiln to enrich iron and remove zinc: heating the rotary kiln to 1000 ℃ by providing heat energy through burning gas in the rotary kiln, starting to put in dried pellets to roast materials, controlling the roasting temperature of the materials at 1100 ℃, controlling the air supply quantity to ensure that the kiln is in a reduction state, roasting the materials in the kiln for 1.5 hours, cooling (recovering heat) the iron-rich slag discharged from the kiln, then sending the cooled iron-rich slag into a storage yard, and actually measuring the iron content of the iron-rich slag to be 62.50% and the zinc content to be 0.14%;
(4) cooling, dedusting and recovering zinc from roasting tail gas of a rotary kiln: roasting tail gas in a rotary kiln at the temperature of 600 ℃, carrying out heat exchange, cooling to 200 ℃, collecting dust, wherein the obtained dust collecting powder is zinc oxide powder with the content of 54%, and the tail gas is discharged after washing and desulfurization to reach the standard.
Example 2
A method for recovering iron and zinc from dust and low-carbon sludge of a steel plant comprises the following steps:
(1) mixing materials: adding the dust ash, the low-carbon sludge and the coke powder of the steel plant into a mixer according to the ratio of 6:2:1, adding 2% of high-molecular polymer adhesive according to the total amount of the materials, starting the mixer to uniformly mix the materials, and assisting a proper amount of spray water according to the water content of the materials in the mixing process to ensure that the water content of the materials is 8.5%;
(2) material ball pressing, drying and dewatering: feeding the mixed materials into a high-pressure ball-making device, wherein the diameter of the pressed ball is 40mm, the finished ball is dried on a belt dryer until the moisture content is less than 1%, and the compressive strength of the dried ball is 70-100kN/cm2；
(3) Roasting the material ball in a rotary kiln to enrich iron and remove zinc: heating the rotary kiln to 1000 ℃ by supplying heat energy through burning gas in the rotary kiln, starting to put in dried pellets to roast materials, controlling the roasting temperature of the materials at 1100 ℃, controlling the air supply quantity to ensure that the kiln is in a reduction state, roasting the materials in the kiln for 1.5 hours, cooling (recovering heat) the iron-rich slag discharged from the kiln, and then sending the cooled iron-rich slag into a storage yard, wherein the iron content of the iron-rich slag is 64.10 percent and the zinc content is 0.10 percent;
(4) cooling, dedusting and recovering zinc from roasting tail gas of a rotary kiln: roasting tail gas in a rotary kiln at the temperature of 600 ℃, carrying out heat exchange, cooling to 200 ℃, collecting dust, wherein the obtained dust collecting powder is zinc oxide powder with the content of 56%, and discharging the tail gas after washing and desulfurization to reach the standard.
Example 3
A method for recovering iron and zinc from dust and low-carbon sludge of a steel plant comprises the following steps:
(1) mixing materials: adding the dust ash, the low-carbon sludge and the coke powder of the steel plant into a mixer according to the proportion of 6:4:0.5, adding 1.5 percent of high-molecular polymer adhesive according to the total amount of the materials, starting the mixer to uniformly mix the materials, and adding a proper amount of spray water according to the water content of the materials in the mixing process to ensure that the water content of the materials is 8.5 percent;
(2) material ball pressing, drying and dewatering: feeding the mixed materials into high-pressure ball-making equipment, making the ball diameter be 30mm, drying the finished ball on a belt-type dryer until the water content is less than 1% and the compression strength of the dried ball is 70-100kN/cm2；
(3) Roasting the material ball in a rotary kiln to enrich iron and remove zinc: heating the rotary kiln to 1000 ℃ by supplying heat energy through burning gas in the rotary kiln, starting to put in dried pellets to roast materials, controlling the roasting temperature of the materials to 1300 ℃, controlling the air supply quantity to ensure that the kiln is in a reduction state, roasting the materials in the kiln for 2 hours, cooling (recovering heat) the iron-rich slag discharged from the kiln, and then sending the cooled iron-rich slag into a storage yard, wherein the iron content of the iron-rich slag is measured to be 62.1 percent and the zinc content is measured to be 0.15 percent;
(4) cooling, dedusting and recovering zinc from roasting tail gas of a rotary kiln: roasting tail gas in a rotary kiln at the temperature of 600 ℃, carrying out heat exchange, cooling to 200 ℃, collecting dust, wherein the obtained dust collecting powder is zinc oxide powder with the content of 53%, and the tail gas is discharged after washing and desulfurization to reach the standard.
Example 4
A method for recovering iron and zinc from dust and low-carbon sludge of a steel plant comprises the following steps:
(1) mixing materials: adding the dust ash, the low-carbon sludge and the coke powder of the steel plant into a mixer according to the proportion of 6:2:1.5, adding 2% of high-molecular polymer adhesive according to the total amount of the materials, starting the mixer to uniformly mix the materials, and adding a proper amount of spray water according to the water content of the materials in the mixing process to ensure that the water content of the materials is 5%;
(2) material ball pressing, drying and dewatering: feeding the mixed materials into a high-pressure ball-making device, wherein the diameter of the pressed ball is 50mm, the finished ball is dried on a belt dryer until the moisture content is less than 1%, and the compressive strength of the dried ball is 70-100kN/cm2；
(3) Roasting the material ball in a rotary kiln to enrich iron and remove zinc: heating the rotary kiln to 1000 ℃ by supplying heat energy through burning gas in the rotary kiln, starting to put in dried pellets to roast materials, controlling the roasting temperature of the materials to 1200 ℃, controlling the air supply quantity to ensure that the kiln is in a reduction state, roasting the materials in the kiln for 1.5 hours, cooling (recovering heat) the iron-rich slag discharged from the kiln, and then sending the cooled iron-rich slag into a storage yard, wherein the iron content of the iron-rich slag is measured by measuring 64.3% and the zinc content is measured by measuring 0.08%;
(4) cooling, dedusting and recovering zinc from roasting tail gas of a rotary kiln: roasting tail gas in a rotary kiln at the temperature of 800 ℃, carrying out heat exchange, cooling to 300 ℃, collecting dust, wherein the obtained dust collecting powder is zinc oxide powder with the content of 57.2%, and discharging the tail gas after washing and desulfurization to reach the standard.
Example 5
A method for recovering iron and zinc from dust and low-carbon sludge of a steel plant comprises the following steps:
(1) mixing materials: adding the dust ash, the low-carbon sludge and the coke powder of the steel plant into a mixer according to the proportion of 4:3:1.5, adding 1% of high-molecular polymer adhesive according to the total amount of the materials, starting the mixer to uniformly mix the materials, and adding a proper amount of spray water according to the water content of the materials in the mixing process to ensure that the water content of the materials is 10%;
(2) material ball pressing, drying and dewatering: feeding the mixed materials into a high-pressure ball-making device, wherein the diameter of the pressed ball is 40mm, the finished ball is dried on a belt dryer until the moisture content is less than 1%, and the compressive strength of the dried ball is 70-100kN/cm2；
(3) Roasting the material ball in a rotary kiln to enrich iron and remove zinc: heating the rotary kiln to 1000 ℃ by supplying heat energy through burning gas in the rotary kiln, starting to put in dried pellets to roast materials, controlling the roasting temperature of the materials to 1000 ℃, controlling the air supply quantity to ensure that the kiln is in a reduction state, roasting the materials in the kiln for 1 hour, cooling (recovering heat) the iron-rich slag discharged from the kiln, and then sending the cooled iron-rich slag into a storage yard, wherein the iron content of the iron-rich slag is measured to be 62.02% and the zinc content is measured to be 0.148%;
(4) cooling, dedusting and recovering zinc from roasting tail gas of a rotary kiln: the temperature of tail gas roasted in a rotary kiln is 700 ℃, the tail gas is cooled to 250 ℃ through heat exchange for dust collection, the obtained dust collection powder is zinc oxide powder with the content of 52.2 percent, and the tail gas is discharged after washing and desulfurization and reaching the standard.
Finally, it should be noted that the above embodiments are merely representative examples of the present invention. Obviously, the technical solution of the present invention is not limited to the above-described embodiments, and many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the present invention are to be considered within the scope of the invention.
Claims (7)
1. A method for recovering iron and zinc from dust and low-carbon sludge of a steel plant is characterized by comprising the following steps:
(1) mixing materials: adding dust and low-carbon sludge of a steel plant into a mixer according to a certain proportion, adding a proper amount of reduced carbon powder, adding 1-2% of binder according to the total amount of materials, starting the mixer to uniformly mix the materials, and ensuring that the water content of the materials is 5-10% in the mixing process;
(2) material ball pressing, drying and dewatering: feeding the mixed materials into high-pressure ball-making equipment, making the diameter of the pressed ball be 30-50mm, drying the finished ball on a belt-type dryer until the water content is less than 1% and the compression strength of the dried ball is 70-100kN/cm2；
(3) Roasting the material ball in a rotary kiln to enrich iron and remove zinc: roasting the materials in the rotary kiln, wherein the roasting temperature of the materials is controlled to be 1000-1300 ℃, and the roasting time is 1-2 hours;
(4) cooling, dedusting and recovering zinc from roasting tail gas of a rotary kiln: the roasting tail gas temperature of the rotary kiln is 600-800 ℃, the dust collection tail gas is cooled to 200-300 ℃ through heat exchange, and the dust collection tail gas is discharged after washing and desulfurization.
2. The method for recovering iron and zinc from dust and low carbon sludge in steel and iron works as claimed in claim 1, wherein the ratio of the dust, the low carbon sludge and the reduced carbon powder in step (1) is (4-6): (2-4): 0.5-1.5).
3. The method for recovering iron and zinc from dust and low carbon sludge of steel and iron plant as claimed in claim 1, wherein the reduced carbon powder in step (1) is coke powder.
4. The method for recovering iron and zinc from dust and low carbon sludge of steel and iron works as claimed in claim 1, wherein the binder in step (1) is a high molecular polymer binder.
5. The method for recovering Fe and Zn from dust and low-carbon sludge of steel and iron works as claimed in claim 4, wherein said high molecular polymer binder is high temperature resistant, non-toxic, harmless and residue-free.
6. The method for recovering iron and zinc from dust and low-carbon sludge in steel and iron plants according to claim 1, wherein in the step (1), a proper amount of spray water is added according to the water content of the materials in the mixing process to ensure that the water content of the materials is 5-10%.
7. The method for recovering iron and zinc from dust and low carbon sludge in steel and iron works as claimed in claim 1, wherein in the step (2), the rotary kiln roasting is to raise the temperature in the rotary kiln by supplying heat energy through gas or coal dust.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110926538.5A CN113637852A (en) | 2021-08-12 | 2021-08-12 | Method for recovering iron and zinc from dust and low-carbon sludge collected from steel plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110926538.5A CN113637852A (en) | 2021-08-12 | 2021-08-12 | Method for recovering iron and zinc from dust and low-carbon sludge collected from steel plant |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101463426A (en) * | 2009-01-15 | 2009-06-24 | 张钦 | Comprehensive utilization method for red mud |
| CN102534199A (en) * | 2012-01-18 | 2012-07-04 | 中南大学 | Comprehensive utilization process of zinc-containing iron dust |
| CN103740939A (en) * | 2013-12-27 | 2014-04-23 | 中冶京诚工程技术有限公司 | Method for producing molten iron and recovering zinc by utilizing zinc-containing dust or sludge in steelworks |
| CN106893867A (en) * | 2017-03-10 | 2017-06-27 | 武汉科思瑞迪科技有限公司 | A kind of method that muffle shaft furnace treatment feed powder containing zinc-iron dirt reclaims zinc |
| CN107460327A (en) * | 2017-07-28 | 2017-12-12 | 重庆科技学院 | A kind of comprehensive reutilization method of the leaded zinc powder dirt of electric furnace steel making |
| WO2020107669A1 (en) * | 2018-11-26 | 2020-06-04 | 贵州大学 | Method for recycling zinc by comprehensively utilizing steelmaking dust |
| CN112111656A (en) * | 2020-08-12 | 2020-12-22 | 北京科技大学 | Method for co-processing zinc-containing and iron-containing dust by blast furnace and rotary kiln |
| CN112442589A (en) * | 2019-08-29 | 2021-03-05 | 宝山钢铁股份有限公司 | Method and system for co-processing waste incineration fly ash and zinc-containing dust and mud of iron and steel plant |
-
2021
- 2021-08-12 CN CN202110926538.5A patent/CN113637852A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101463426A (en) * | 2009-01-15 | 2009-06-24 | 张钦 | Comprehensive utilization method for red mud |
| CN102534199A (en) * | 2012-01-18 | 2012-07-04 | 中南大学 | Comprehensive utilization process of zinc-containing iron dust |
| CN103740939A (en) * | 2013-12-27 | 2014-04-23 | 中冶京诚工程技术有限公司 | Method for producing molten iron and recovering zinc by utilizing zinc-containing dust or sludge in steelworks |
| CN106893867A (en) * | 2017-03-10 | 2017-06-27 | 武汉科思瑞迪科技有限公司 | A kind of method that muffle shaft furnace treatment feed powder containing zinc-iron dirt reclaims zinc |
| CN107460327A (en) * | 2017-07-28 | 2017-12-12 | 重庆科技学院 | A kind of comprehensive reutilization method of the leaded zinc powder dirt of electric furnace steel making |
| WO2020107669A1 (en) * | 2018-11-26 | 2020-06-04 | 贵州大学 | Method for recycling zinc by comprehensively utilizing steelmaking dust |
| CN112442589A (en) * | 2019-08-29 | 2021-03-05 | 宝山钢铁股份有限公司 | Method and system for co-processing waste incineration fly ash and zinc-containing dust and mud of iron and steel plant |
| CN112111656A (en) * | 2020-08-12 | 2020-12-22 | 北京科技大学 | Method for co-processing zinc-containing and iron-containing dust by blast furnace and rotary kiln |
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