CN114317866A - Method for recycling stainless steel scrap to replace alloy in converter - Google Patents
Method for recycling stainless steel scrap to replace alloy in converter Download PDFInfo
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- CN114317866A CN114317866A CN202210063162.4A CN202210063162A CN114317866A CN 114317866 A CN114317866 A CN 114317866A CN 202210063162 A CN202210063162 A CN 202210063162A CN 114317866 A CN114317866 A CN 114317866A
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- stainless steel
- converter
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- scrap
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- 239000010935 stainless steel Substances 0.000 title claims abstract description 82
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000004064 recycling Methods 0.000 title claims abstract description 22
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 21
- 239000000956 alloy Substances 0.000 title claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 60
- 239000010959 steel Substances 0.000 claims abstract description 60
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000007664 blowing Methods 0.000 claims abstract description 21
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 20
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000012360 testing method Methods 0.000 claims abstract description 15
- 229910052742 iron Inorganic materials 0.000 claims abstract description 13
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 33
- 238000012856 packing Methods 0.000 claims description 17
- 229910052759 nickel Inorganic materials 0.000 claims description 14
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 10
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 10
- 229910000514 dolomite Inorganic materials 0.000 claims description 10
- 239000010459 dolomite Substances 0.000 claims description 10
- 239000004571 lime Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 238000003723 Smelting Methods 0.000 abstract description 8
- 238000011084 recovery Methods 0.000 abstract description 4
- 230000006872 improvement Effects 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 3
- 239000011651 chromium Substances 0.000 description 20
- 229910052804 chromium Inorganic materials 0.000 description 8
- 239000010963 304 stainless steel Substances 0.000 description 6
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 6
- 239000002893 slag Substances 0.000 description 6
- 239000002699 waste material Substances 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 229910000604 Ferrochrome Inorganic materials 0.000 description 2
- 229910000870 Weathering steel Inorganic materials 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000013468 resource allocation Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
Images
Classifications
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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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- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention provides a method for recycling stainless steel and scrap steel to replace alloy by a converter, and relates to the fields of converter smelting and scrap steel recovery. The method comprises the following steps: obtaining stainless steel scrap; selecting stainless steel scrap steel with components matched with steel grades according to the components of the steel grades smelted by the converter from the obtained stainless steel scrap steel; stainless steel scrap is put into a converter; adding molten iron into the converter; blowing the converter normally and adding the first batch; adding two batches corresponding to the slagging condition into the converter according to the slagging condition in the converter; measuring the temperature and the carbon content of the TSC molten steel and testing the TSC sample components; determining carbon pulling time according to the temperature and the carbon content of the TSC molten steel; and determining the amount of the added Cr iron and the amount of the electrolytic Ni according to the components of the TSC sample. The invention can recover the stainless steel scrap steel, can effectively improve the difficult problem that the stainless steel scrap steel is difficult to recycle, and has the characteristics of economy, practicality, simplicity, convenience, effectiveness, cost reduction, efficiency improvement and the like.
Description
Technical Field
The invention relates to the fields of converter smelting and scrap steel recovery, in particular to a method for recycling stainless steel scrap steel to replace alloy in a converter.
Background
Iron ore is a primary resource, the primary resource is limited and non-renewable, and is exhausted at all times, and the resource crisis is settled, so that how to save mining and scientifically adjust resource allocation is imperative. The waste steel is the only raw material capable of replacing iron ore in the production of steel, and the waste steel resource is developed and applied to the maximum extent, so that the waste steel becomes an important way for relieving the crisis of the iron ore resource. The 'less ore and more scrap steel' are inevitable in the historical development. China is a country lacking nickel and chromium, and the recovery and utilization of nickel and chromium elements in stainless steel scrap has great significance for reducing the cost of steelmaking alloy; meanwhile, the method is also a hot problem in the field of scrap steel recovery and needs to be solved urgently.
Disclosure of Invention
The invention aims to provide a method for recycling stainless steel scrap to replace alloy in a converter, which can recycle the stainless steel scrap, effectively improve the difficult problem that the stainless steel scrap is difficult to recycle, and has the characteristics of economy, practicality, simplicity, effectiveness, cost reduction, efficiency improvement and the like.
Embodiments of the invention may be implemented as follows:
the embodiment of the invention provides a method for replacing alloy with stainless steel scrap recycled by a converter, which is used for preparing alloy by utilizing the stainless steel scrap, and comprises the following steps:
obtaining stainless steel scrap;
selecting the stainless steel scrap with the components matched with the steel grade according to the components of the steel grade smelted by the converter in the obtained stainless steel scrap;
loading the stainless steel scrap into a converter;
adding molten iron into the converter;
blowing the converter normally and adding a head batch;
adding two batches corresponding to the slagging condition into the converter according to the slagging condition in the converter;
measuring the temperature and the carbon content of the TSC molten steel and testing the TSC sample components;
determining carbon pulling time according to the temperature and the carbon content of the TSC molten steel;
and determining the amount of the added Cr iron and the amount of the electrolytic Ni according to the TSC sample components.
Further, in an optional embodiment, the step of obtaining stainless steel scrap comprises:
and (4) packing and recycling the stainless steel scrap in a packing block mode according to the mark.
Further, in an optional embodiment, in the step of packing and recycling the stainless steel scrap in the form of a packing block according to the grade, the size of the packing block is as follows: 300mm-1000mm long, 200mm-600mm wide and 200mm-600mm high.
Further, in an alternative embodiment, in the step of packing and recycling the stainless steel scrap in the form of packing blocks according to the brand, the weight of a single packing block is between 30kg and 800 kg.
Further, in an alternative embodiment, for the stainless steel scrap containing no nickel, the step of charging the stainless steel scrap into the converter comprises:
loading the stainless steel scrap into a scrap hopper;
and loading the stainless steel scrap in the scrap hopper into a converter.
Further, in an alternative embodiment, for the stainless steel scrap containing nickel, the step of charging the stainless steel scrap into the converter comprises:
and magnetic disc suction is adopted to be loaded into the converter together with the scrap steel.
Further, in an alternative embodiment, in the step of normally blowing the converter and adding the first batch, the first batch is added with 0-6t lime and 1t-3t light burned dolomite.
Further, in an optional embodiment, the step of adding two batches corresponding to the slagging condition into the converter according to the slagging condition in the converter comprises:
after the first preset time of blowing, adding two batches of 2t-7t lime, 1t-3t light-burned dolomite and 0.1t-1.5t ore according to the slagging condition in the converter.
Further, in an alternative embodiment, the step of measuring the TSC molten steel temperature and carbon content and assaying the TSC-like composition comprises:
and after the second preset time of blowing, dynamically measuring the temperature and the carbon content of the TSC molten steel, and sending the TSC steel sample for testing.
Further, in an optional embodiment, the second preset time is greater than the first preset time, the first preset time is set to be 3min to 12min, and the second preset time is set to be 13min to 17 min.
The method for recycling the stainless steel scrap to replace the alloy by the converter has the following beneficial effects:
the method for recycling the stainless steel scrap to replace the alloy in the converter provided by the embodiment comprises the following steps: the process of adding the steel scrap, blowing, deoxidizing, alloying and the like in the converter is met, and the stainless steel scrap is recycled. The yield of Ni and the yield of Cr are 100 percent and 32.34 to 70.83 percent (average 53.28 percent) respectively by testing the stainless steel scrap. The method provided by the invention can adopt a less-slag smelting mode when smelting steel grades with higher P content, and can reduce the proportion of Cr element in stainless steel scrap steel which is oxidized into slag, thereby improving the Cr yield. The method fully utilizes the effective components of Cr, Ni, Mo and the like in the stainless steel scrap, and not only completely recovers the stainless steel scrap. Effectively solves the difficult problem that the stainless steel scrap steel is difficult to recycle, is economical, practical, simple, convenient and effective, and reduces cost and improves efficiency.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below. It is appreciated that the following drawings depict only certain embodiments of the invention and are therefore not to be considered limiting of its scope. For a person skilled in the art, it is possible to derive other relevant figures from these figures without inventive effort.
Fig. 1 is a block diagram of steps of a method for recycling stainless steel scrap instead of alloy in a converter according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1, the present embodiment provides a method for recycling stainless steel scrap instead of alloy in a converter, which can be used for preparing alloy from stainless steel scrap. As shown in fig. 1, the method includes the following steps.
Step S100: and obtaining the stainless steel scrap.
In an alternative embodiment, the step S100 of obtaining stainless steel scrap may include the substep S110: according to the brand, stainless steel scrap is packed and recycled in a packing block mode, so that packing and recycling are more convenient and simpler.
Optionally, in step S110 of packing and recycling the stainless steel scrap in the form of packing blocks according to the grade, the size of the packing blocks is: 300mm-1000mm long, 200mm-600mm wide and 200mm-600mm high. Furthermore, the weight of the individual baled pieces is between 30kg and 800 kg. Of course, without limitation, the bale may be provided in other sizes and weights in other embodiments of the invention.
Step S200: and selecting stainless steel scrap with the components matched with the steel grade from the obtained stainless steel scrap according to the components of the steel grade smelted by the converter.
Step S300: stainless steel scrap is charged into a converter.
In an alternative embodiment, for stainless steel scrap containing no nickel, the step S300 of charging stainless steel scrap into the converter may include the substep S310 of: stainless steel scrap is put into a scrap hopper; and, substep S320: and (4) loading the stainless steel scrap in the scrap hopper into the converter.
In an alternative embodiment, for nickel-containing stainless steel scrap, the step S300 of charging stainless steel scrap into the converter may include the substeps S330: the magnetic disc is sucked and loaded into the converter together with the scrap steel.
Step S400: adding molten iron into the converter.
Step S500: the converter was allowed to blow normally and the top batch was added.
Further, the converter is normally blown and the first batch is charged with 0 to 6t of lime and 1 to 3t of light burned dolomite in step S500.
Step S600: according to the slagging condition in the converter, adding two batches corresponding to the slagging condition into the converter.
Further, the step S600 of adding two batches corresponding to the slagging condition into the converter according to the slagging condition in the converter includes the substep S610: after the first preset time of blowing, adding two batches of 2t-7t lime, 1t-3t light-burned dolomite and 0.1t-1.5t ore according to the slagging condition in the converter.
Step S700: measuring the TSC molten steel temperature and carbon content, and testing the TSC sample components.
Further, the step S700 of measuring the temperature and carbon content of the TSC molten steel and assaying the TSC-like components includes: and after the second preset time of blowing, dynamically measuring the temperature and the carbon content of the TSC molten steel, and sending the TSC steel sample for testing.
It should be noted that the second preset time is greater than the first preset time. Optionally, the first preset time is set to be 3min-12min, and the second preset time is set to be 13min-17 min.
Step S800: and determining the carbon pulling time according to the temperature and the carbon content of the TSC molten steel.
Step S900: and determining the amount of the added Cr iron and the amount of the electrolytic Ni according to the components of the TSC sample.
Two specific examples are provided below to explain the method for recycling stainless steel scrap to replace alloy in the converter in more detail, and it can be directly understood from the two specific examples that the method can effectively improve the difficult problem that stainless steel scrap is difficult to recycle, and has the characteristics of economy, practicality, simplicity, effectiveness, cost reduction, efficiency improvement and the like.
Example 1
In the embodiment, the converter number is 212E03605, and the specific steps are as follows:
(1) 304 stainless steel scrap steel is packed, the packing weight is 800 plus or minus 10 kg/block, the length multiplied by the width multiplied by the height is less than or equal to 1000 multiplied by 600mm
(2) Smelting a weathering steel grade (SPA-H), and judging that the ratio of Ni: 0.05% -0.09%, Cr: 0.3 to 0.55 percent.
(3) 1.59t of 304 stainless steel scrap steel is loaded into a scrap steel bucket by a steel grab or a forklift and is loaded into the converter together with the scrap steel.
(4) And then adding the desulfurized molten iron.
(5) The converter starts normal blowing, 3.342t lime and 2.218t light-burned dolomite are added into the first batch;
(6) blowing was carried out for 5 minutes, two batches, 6.497t lime, 2.432t light burned dolomite and 0.15t ore, were added.
(7) Blowing for 14.88min to measure TSC sample, and testing result C: 0.252%, P: 0.016 percent.
(8) Lifting the gun after blowing for 16.97min, measuring a TSO sample, and testing a result C: 0.04%, Ni: 0.053%, Cr: 0.043 percent. 0.05t of electrolytic nickel and 1.332t of low-carbon ferrochrome are added according to the test result.
(9) The yield of Ni in 304 stainless steel scrap is calculated to be 100 percent, and the yield of Cr is calculated to be 32.34 percent.
(10) 14.489t of slag-making materials are added in total, the slag amount is large, and the yield of Cr element is 32.34%.
Example 2
In this example, the converter number is 212E04033, and the specific steps are as follows:
(1) 304 stainless steel scrap steel is packed, the packing weight is 800 plus or minus 10 kg/block, the length multiplied by the width multiplied by the height is less than or equal to 1000 multiplied by 600mm
(2) Smelting a weathering steel grade (SPA-H), and judging that the ratio of Ni: 0.04-0.08%, Cr: 0.3 to 0.6 percent.
(3) 1.61t of 304 stainless steel scrap steel is loaded into a scrap steel bucket by a steel grab or a forklift, and is loaded into the converter together with other scrap steel.
(4) And then adding the desulfurized molten iron.
(5) The converter starts normal blowing, 3.976t lime and 0.437t light-burned dolomite are added into the first batch;
(6) blowing was carried out for 11 minutes, two batches, 3.618t lime, 3.817t light burned dolomite and 0.32t ore were added.
(7) Blowing for 14.07min to measure TSC sample, and testing result C: 0.316%, P: 0.063%.
(8) Lifting the gun after blowing for 15.23min, measuring a TSO sample, and testing a result C: 0.044%, Ni: 0.050%, Cr: 0.083%. 0t of electrolytic nickel and 1.494t of low-carbon ferrochrome are added according to the test result.
(9) The yield of Ni in 304 stainless steel scrap is calculated to be 100 percent, and the yield of Cr is calculated to be 70.83 percent.
(10) 11.848t of slag-making materials are added in total, the slag amount is small, and the yield of Cr element is 70.83 percent.
In summary, the method for recycling stainless steel scrap to replace alloy in the converter provided by the embodiment comprises the following steps: the process of adding the steel scrap, blowing, deoxidizing, alloying and the like in the converter is met, and the stainless steel scrap is recycled. The yield of Ni and the yield of Cr are 100 percent and 32.34 to 70.83 percent (average 53.28 percent) respectively by testing the stainless steel scrap. The method provided by the invention can adopt a less-slag smelting mode when smelting steel grades with higher P content, and can reduce the proportion of Cr element in stainless steel scrap steel which is oxidized into slag, thereby improving the Cr yield. The method fully utilizes the effective components of Cr, Ni, Mo and the like in the stainless steel scrap, and not only completely recovers the stainless steel scrap. Effectively solves the difficult problem that the stainless steel scrap steel is difficult to recycle, is economical, practical, simple, convenient and effective, and reduces cost and improves efficiency.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A method for recycling stainless steel scrap to replace alloy in a converter, which is used for preparing alloy by utilizing the stainless steel scrap, and is characterized by comprising the following steps:
obtaining stainless steel scrap;
selecting the stainless steel scrap with the components matched with the steel grade according to the components of the steel grade smelted by the converter in the obtained stainless steel scrap;
loading the stainless steel scrap into a converter;
adding molten iron into the converter;
blowing the converter normally and adding a head batch;
adding two batches corresponding to the slagging condition into the converter according to the slagging condition in the converter;
measuring the temperature and the carbon content of the TSC molten steel and testing the TSC sample components;
determining carbon pulling time according to the temperature and the carbon content of the TSC molten steel;
and determining the amount of the added Cr iron and the amount of the electrolytic Ni according to the TSC sample components.
2. The method of claim 1, wherein the step of obtaining the stainless steel scrap comprises:
and (4) packing and recycling the stainless steel scrap in a packing block mode according to the mark.
3. The method for recycling stainless steel scrap alloy for a converter according to claim 2, wherein in the step of baling and recycling the stainless steel scrap in the form of baling blocks according to the grade, the dimensions of the baling blocks are as follows: 300mm-1000mm long, 200mm-600mm wide and 200mm-600mm high.
4. The method for recycling stainless steel scrap replacement alloy for a converter according to claim 2 or 3, wherein in the step of baling and recovering the stainless steel scrap in the form of baled blocks according to the grade, the weight of a single bale block is between 30kg and 800 kg.
5. The method of claim 1, wherein the step of charging the stainless steel scrap into the converter comprises, for the stainless steel scrap containing no nickel:
loading the stainless steel scrap into a scrap hopper;
and loading the stainless steel scrap in the scrap hopper into a converter.
6. The method of claim 1, wherein the step of charging the stainless steel scrap into the converter comprises, for the stainless steel scrap comprising nickel:
and magnetic disc suction is adopted to be loaded into the converter together with the scrap steel.
7. The method of claim 1, wherein the step of blowing the converter normally and adding a first batch of material comprises adding 0-6t lime and 1t-3t soft burned dolomite.
8. The method for recycling stainless steel scrap alloy for a converter according to claim 1, wherein the step of adding two batches of the alloy corresponding to the slagging condition into the converter according to the slagging condition in the converter comprises: after the first preset time of blowing, adding two batches of 2t-7t lime, 1t-3t light-burned dolomite and 0.1t-1.5t ore according to the slagging condition in the converter.
9. The method of claim 8, wherein the steps of measuring the TSC molten steel temperature and carbon content, and assaying the TSC-like composition comprise:
and after the second preset time of blowing, dynamically measuring the temperature and the carbon content of the TSC molten steel, and sending the TSC steel sample for testing.
10. The method of claim 9, wherein the second predetermined time is longer than the first predetermined time, the first predetermined time is set to 3-12 min, and the second predetermined time is set to 13-17 min.
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| Application Number | Priority Date | Filing Date | Title |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210063162.4A CN114317866B (en) | 2022-01-19 | 2022-01-19 | Method for recycling stainless steel scrap steel to replace alloy by converter |
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| CN114317866B CN114317866B (en) | 2023-05-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114934225A (en) * | 2022-05-13 | 2022-08-23 | 首钢京唐钢铁联合有限责任公司 | Steel smelting method |
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| US4919713A (en) * | 1988-02-24 | 1990-04-24 | Kawasaki Steel Corp. | Process for producing chromium containing molten iron |
| JPH0967608A (en) * | 1995-08-28 | 1997-03-11 | Sumitomo Metal Ind Ltd | Production of stainless steel |
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| CN113430334A (en) * | 2021-06-25 | 2021-09-24 | 宝钢德盛不锈钢有限公司 | GOR smelting method for improving scrap steel ratio of 200 series stainless steel |
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2022
- 2022-01-19 CN CN202210063162.4A patent/CN114317866B/en active Active
Patent Citations (8)
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| US4919713A (en) * | 1988-02-24 | 1990-04-24 | Kawasaki Steel Corp. | Process for producing chromium containing molten iron |
| JPH0967608A (en) * | 1995-08-28 | 1997-03-11 | Sumitomo Metal Ind Ltd | Production of stainless steel |
| JP2005240141A (en) * | 2004-02-27 | 2005-09-08 | Jfe Steel Kk | Method for melting nickel-containing stainless steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114934225A (en) * | 2022-05-13 | 2022-08-23 | 首钢京唐钢铁联合有限责任公司 | Steel smelting method |
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