CN117512255A - Method for recycling precious metals in gas cutting slag of large-scale cast and forged piece - Google Patents
Method for recycling precious metals in gas cutting slag of large-scale cast and forged piece Download PDFInfo
- Publication number
- CN117512255A CN117512255A CN202311573300.4A CN202311573300A CN117512255A CN 117512255 A CN117512255 A CN 117512255A CN 202311573300 A CN202311573300 A CN 202311573300A CN 117512255 A CN117512255 A CN 117512255A
- Authority
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- China
- Prior art keywords
- gas cutting
- slag
- cutting slag
- scrap steel
- scale
- 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.)
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Links
- 239000002893 slag Substances 0.000 title claims abstract description 61
- 238000005520 cutting process Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000004064 recycling Methods 0.000 title claims abstract description 16
- 239000010970 precious metal Substances 0.000 title claims abstract description 12
- 239000007789 gas Substances 0.000 claims abstract description 41
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 36
- 239000010959 steel Substances 0.000 claims abstract description 36
- 238000005242 forging Methods 0.000 claims abstract description 16
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 15
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 15
- 239000004571 lime Substances 0.000 claims abstract description 15
- 238000005266 casting Methods 0.000 claims abstract description 12
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 11
- 229910000510 noble metal Inorganic materials 0.000 claims abstract description 10
- 238000003723 Smelting Methods 0.000 claims abstract description 9
- 238000010891 electric arc Methods 0.000 claims abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000010079 rubber tapping Methods 0.000 claims abstract description 8
- 230000005540 biological transmission Effects 0.000 claims abstract description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000002844 melting Methods 0.000 claims abstract description 5
- 230000008018 melting Effects 0.000 claims abstract description 5
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 5
- 239000001301 oxygen Substances 0.000 claims abstract description 5
- 230000005611 electricity Effects 0.000 claims abstract description 4
- 238000003825 pressing Methods 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 5
- 238000009845 electric arc furnace steelmaking Methods 0.000 abstract description 4
- 238000011084 recovery Methods 0.000 abstract description 4
- 239000004484 Briquette Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/527—Charging of the electric furnace
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0025—Adding carbon material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention provides a method for recycling precious metals in gas cutting slag of a large-scale casting and forging piece, and belongs to the technical field of metallurgical engineering. The method comprises the following steps of (1) loading large-scale casting and forging gas cutting slag into the bottom of an electric arc furnace, loading scrap steel briquettes, and transmitting electricity; (2) Adding lime when the scrap steel briquettes are 70-80% molten, and carrying out power transmission and slagging; (3) After complete melting, oxygen and carbon powder are blown in, the temperature is controlled to be 1550-1600 ℃ for reaction for 10-15 min, slag flows out, lime is added for slag making and smelting, and after C, P meets the requirements, the temperature is raised for tapping. In the invention, the recovery of noble metals in the gas cutting slag can be completed simultaneously in the early stage of electric arc furnace steelmaking without adding other equipment, and 70-80% of Ni element and 80-85% of Mo element in the gas cutting slag can be effectively recovered.
Description
Technical Field
The invention belongs to the technical field of metallurgical engineering, and particularly relates to a method for recycling precious metals in gas cutting slag of a large-scale cast and forged piece.
Background
The large-scale cast forging is a core part of high-end equipment, and most of materials used for the special use requirement of the large-scale cast forging contain precious metals such as Cr, ni, mo, co, W. In the manufacturing process, the material is required to be separated and processed by adopting a flame cutting mode, a large amount of gas cutting slag is generated, the generation amount is about 3-5% of the production amount of the large-scale casting and forging piece, and the gas cutting slag contains a large amount of noble metal oxide. The large cast-forging piece in China is about 200 ten thousand tons each year, and about 3 ten thousand to 5 ten thousand tons of gas cutting slag containing a large amount of noble metal element oxides are produced.
At present, the application of the gas cutting slag is relatively few, and a small part of the gas cutting slag is used as an oxidant in the scrap steel smelting process, and is added after all scrap steel is melted, and flows out after the scrap steel reacts with C rapidly, so that precious metal elements in the gas cutting slag can not be recovered almost in the process; in addition, most of the gas cutting slag is treated as common oxidized metallurgical slag, so that great waste of precious metal elements in the gas cutting slag is caused.
Therefore, a method for fully recycling noble metal elements in the gas cutting slag is needed.
Disclosure of Invention
In order to solve the problem that the gas cutting slag is not fully utilized, the invention provides a method for recycling noble metals in the gas cutting slag of a large-scale casting and forging piece, and the recycling process of the gas cutting slag can be completed simultaneously in the early stage of electric arc furnace steelmaking without adding other equipment.
The technical scheme of the invention is as follows:
the invention provides a method for recycling precious metals in gas cutting slag of a large-scale cast and forged piece, which comprises the following steps:
(1) Loading the large-scale casting and forging gas cutting slag into the bottom of an electric arc furnace, loading into a scrap steel briquetting, and transmitting electricity;
(2) Adding lime when the scrap steel briquettes are 70-80% molten, and carrying out power transmission and slagging;
(3) After complete melting, oxygen and carbon powder are blown in, the temperature is controlled to be 1550-1600 ℃ for reaction for 10-15 min, slag flows out, lime is added for slag making and smelting, and after C, P meets the requirements, the temperature is raised for tapping.
In a specific embodiment, the mass of the gas cutting slag is 9.5% -20% of the mass of the scrap steel briquette.
In a specific embodiment, the mass of the gas cutting slag is 20% of the mass of the scrap steel briquette.
In a specific embodiment, in the step (2), the mass of lime added is 1% -2% of the total mass of the scrap steel briquette.
In one embodiment, in step (3), stirring is also performed during the reaction.
In a specific embodiment, in the step (3), the temperature is raised to 1680-1700 ℃ at 8-12 ℃/min before tapping.
In one embodiment, the scrap steel briquette is a carbon scrap steel briquette.
Compared with the prior art, the invention has the following beneficial effects:
according to the technical scheme, the recovery of precious metals in the gas cutting slag can be completed simultaneously in the early stage of electric arc furnace steelmaking without adding other equipment, and 70-80% of Ni element and 80-85% of Mo element in the gas cutting slag can be effectively recovered.
Detailed Description
The invention provides a method for recycling precious metals in gas cutting slag of a large-scale cast and forged piece, which comprises the following steps:
(1) Loading the large-scale casting and forging gas cutting slag into the bottom of an electric arc furnace, loading into a scrap steel briquetting, and transmitting electricity;
(2) Adding lime when the scrap steel briquettes are 70-80% molten, and carrying out power transmission and slagging;
(3) After complete melting, oxygen and carbon powder are blown in, the temperature is controlled to be 1550-1600 ℃ for reaction for 10-15 min, slag flows out, lime is added for slag making and smelting, and after C, P meets the requirements, the temperature is raised for tapping.
In the process of electric arc furnace steelmaking, if excessive smelting raw materials are contained in the electric arc furnace at one time, the scrap steel pressing blocks can be added in batches, and after the step (2), the rest scrap steel pressing blocks are fed into the electric arc furnace in batches, and power transmission and slag formation are carried out.
After reacting for 10-15 min at 1550-1600 ℃, ni and Mo are recovered into molten steel, feO in slag is high at the moment and is unfavorable for P removal, so that slag is required to flow out, and lime is added for re-slagging.
In a specific embodiment, the mass of the gas cutting slag is 9.5% -20% of the mass of the scrap steel briquette.
In a specific embodiment, the mass of the gas cutting slag is 20% of the mass of the scrap steel briquette.
In a specific embodiment, in the step (2), the mass of lime added is 1% -2% of the total mass of the scrap steel briquette.
In one embodiment, in step (3), stirring is also performed during the reaction.
In a specific embodiment, in the step (3), the temperature is raised to 1680-1700 ℃ at 8-12 ℃/min before tapping.
In one embodiment, the scrap steel briquette is a carbon scrap steel briquette.
The present invention will be described in further detail with reference to examples and comparative examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The large forging gas cutting slag metal recovery procedure for examples 1-2 and comparative examples 1-2 is as follows:
(1) The large-scale casting and forging gas cutting slag is arranged at the bottom of an electric arc furnace, then a scrap steel briquetting is arranged, and power transmission is carried out;
(2) Adding 1-2 t lime when the carbon steel scrap briquettes are melted by about 80%, and transmitting power to perform slag formation;
(3) After complete melting, oxygen and carbon powder are blown in, stirring and reacting for 10-15 min at 1550-1600 ℃, ni and Mo are recovered at the moment, feO in slag is very high and is unfavorable for P removal, slag is required to flow out, lime is added again for slag making and smelting, and after C, P meets the requirement, the temperature is increased to 1680-1700 ℃ at 8-12 ℃/min, and steel is tapped.
In the metal recovery process, if excessive smelting raw materials cannot be completely contained in the electric arc furnace at one time, the scrap steel pressing blocks can be added in batches, and after the step (2), the rest scrap steel pressing blocks are fed into the electric arc furnace in batches, and power transmission and slag formation are carried out.
Specific parameters for examples 1-2 and comparative examples 1-2 are shown in the following table:
wherein the steel grade of Ni4 is 25Cr2Ni4MoV steel grade.
The calculation formula of the yields of Ni and Mo is as follows: element yield= (amount of molten steel tapped/t×element content/%)/(amount of gas slag/t×element content/%)
Comparative example 3
Substantially the same as in example 1, except that: and (3) directly flowing out slag without stirring reaction in the step (3), then adding lime again for slag making smelting, and heating to 1680-1700 ℃ at 8-12 ℃/min after C, P meets the requirement for tapping.
The yield of Ni in comparative example 3 was 15%, and the yield of Mo was 17%.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (7)
1. The method for recycling the noble metal in the gas cutting slag of the large-scale cast and forged piece is characterized by comprising the following steps of:
(1) Loading the large-scale casting and forging gas cutting slag into the bottom of an electric arc furnace, loading into a scrap steel briquetting, and transmitting electricity;
(2) Adding lime when the scrap steel briquettes are 70-80% molten, and carrying out power transmission and slagging;
(3) After complete melting, oxygen and carbon powder are blown in, the temperature is controlled to be 1550-1600 ℃ for reaction for 10-15 min, slag flows out, lime is added for slag making and smelting, and after C, P meets the requirements, the temperature is raised for tapping.
2. The method for recycling noble metals in large-scale casting and forging gas cutting slag according to claim 1, wherein the mass of the gas cutting slag is 9.5% -20% of the mass of the scrap steel pressing block.
3. The method for recycling precious metals in large-scale casting and forging gas cutting slag according to claim 1, wherein the mass of the gas cutting slag is 20% of the mass of the scrap steel pressing block.
4. The method for recycling noble metals in gas cutting slag of large-scale cast and forging according to claim 1, wherein in the step (2), the mass of lime added is 1% -2% of the mass of the scrap steel pressing block.
5. The method for recycling noble metals in gas cutting slag of large-scale castings according to claim 1, wherein in the step (3), stirring is also performed during the reaction.
6. The method for recycling noble metals in large-scale casting and forging gas cutting slag according to claim 1, wherein in the step (3), the temperature is raised to 1680-1700 ℃ at 8-12 ℃/min before tapping.
7. The method for recycling precious metals in gas cutting slag of large-scale cast and forged pieces according to claim 1, wherein the scrap steel pressing block is a carbon scrap steel pressing block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311573300.4A CN117512255A (en) | 2023-11-23 | 2023-11-23 | Method for recycling precious metals in gas cutting slag of large-scale cast and forged piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311573300.4A CN117512255A (en) | 2023-11-23 | 2023-11-23 | Method for recycling precious metals in gas cutting slag of large-scale cast and forged piece |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117512255A true CN117512255A (en) | 2024-02-06 |
Family
ID=89762386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311573300.4A Pending CN117512255A (en) | 2023-11-23 | 2023-11-23 | Method for recycling precious metals in gas cutting slag of large-scale cast and forged piece |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117512255A (en) |
-
2023
- 2023-11-23 CN CN202311573300.4A patent/CN117512255A/en active Pending
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