CN116590493A - Antimony adding method for improving antimony yield in steelmaking process - Google Patents
Antimony adding method for improving antimony yield in steelmaking process Download PDFInfo
- Publication number
- CN116590493A CN116590493A CN202310235427.9A CN202310235427A CN116590493A CN 116590493 A CN116590493 A CN 116590493A CN 202310235427 A CN202310235427 A CN 202310235427A CN 116590493 A CN116590493 A CN 116590493A
- Authority
- CN
- China
- Prior art keywords
- antimony
- yield
- steel
- converter
- steelmaking process
- 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
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 229910052787 antimony Inorganic materials 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000009628 steelmaking Methods 0.000 title claims abstract description 9
- 238000010079 rubber tapping Methods 0.000 claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 18
- 239000010959 steel Substances 0.000 claims abstract description 18
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 5
- 239000011593 sulfur Substances 0.000 claims abstract description 5
- 238000007664 blowing Methods 0.000 claims abstract description 3
- 238000005070 sampling Methods 0.000 claims abstract description 3
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000003723 Smelting Methods 0.000 abstract description 4
- 239000002436 steel type Substances 0.000 abstract description 4
- 231100000331 toxic Toxicity 0.000 abstract description 3
- 230000002588 toxic effect Effects 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000012797 qualification Methods 0.000 abstract description 2
- 238000007670 refining Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
Classifications
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- 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
- C21C7/0006—Adding metallic additives
-
- 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
- C21C5/28—Manufacture of steel in the converter
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses an antimony adding method for improving the antimony yield in the steelmaking process, wherein when a converter is smelted, the blowing stop temperature of the converter is controlled to be 1610-1640 ℃, after tapping is finished, sampling is performed to detect the sulfur content, and if the sulfur content meets the standard, an antimony ingot is added into a ladle according to the proportion of 0.065-0.075% of the antimony content. The invention ensures that the content of Sb in the steel is stable and controlled, improves the qualification rate of components, and simultaneously avoids volatilization of toxic Sb vapor. The method has reference significance for smelting all the Sb-containing steel types, is simple to operate, does not increase the cost, has great significance for environmental protection, and can be popularized to other steel plants.
Description
Technical Field
The invention relates to the technical field of steelmaking.
Background
Zhanjiang steel mill expands a steel grade containing special alloy antimony Sb, wherein the content of Sb is about 0.07 percent, namely 0.065 to 0.075 percent, and antimony ingots are required to be added in the smelting process. The technological path of the steel grade is as follows: converter-RH refining-continuous casting.
The main steps of converter smelting are as follows: scrap steel is fed into a furnace, molten iron is fed into the furnace, auxiliary materials are fed into the furnace, oxygen blowing is carried out, tapping is carried out, and steel ladle hanging is carried out. The main steps of RH refining are as follows: ladle lifting-in-vacuumizing decarburization-alloy addition-vacuum circulation-ladle lifting-out. Antimony ingots can only be added in a converter or a refining process, and the condition that alloy is not added at the end of refining is not adopted.
The existing Sb adding technology is that antimony ingots are filled into an iron drum, and are put into a steel ladle after tapping is finished. The reason for this operation is: 1. because the steel grade has strict requirements on the S element, the S content is generally required to be sampled and detected after tapping of the converter, and other steel grades are required to be changed if exceeding standard, antimony ingots cannot be added before tapping, so that steel change is avoided. 2. Antimony ingots cannot be added at the refining station because the specification of antimony ingots is 20 kg/block, the size is about 200×100×100mm3, and the refining bin cannot handle such large-size materials. And antimony ingot suppliers do not have the capability of producing granular antimony particles, even if the granular antimony particles can be produced, the normal production of other steel types is seriously influenced by specially using one bin for antimony ingots because the steel type has little yield. So that antimony ingots can only be added before the tapping is finished to refining.
The prior art has the defects that: 1. the yield of Sb is unstable, and under the condition of fixed addition of antimony ingots, the content of Sb in the finished product fluctuates greatly and often exceeds the upper limit and the lower limit, so that the performance of the product is unqualified. 2. The Sb element is toxic and volatilized into the air, so that the Sb element can cause damage to human health.
The invention introduces a new process, and the Sb content is stably controlled by controlling the tapping temperature of a converter.
Disclosure of Invention
The boiling point of the Sb element is 1635 ℃ and is close to the temperature of molten steel in tapping, so that the gasification amount of Sb fluctuates when the tapping temperature fluctuates, and the Sb entering the molten steel fluctuates. Counting the production results of the 50 furnace steel to obtain the relation between the Sb yield and the tapping temperature, wherein as shown in figure 1, the Sb yield and the tapping temperature are inversely related; the higher the tapping temperature is, the lower the Sb yield is, and when the tapping temperature is close to 1640 ℃, the yield is close to 100%.
The invention provides an antimony adding method for improving the yield of antimony in the steelmaking process, which aims to overcome the defects of the prior art and adopts the following technical scheme:
a method for adding antimony to increase the yield of antimony in the steelmaking process includes such steps as controlling the blowing-off temp. of converter at 1610-1640 deg.C, sampling after tapping, detecting sulfur content, and if it meets the standard, adding antimony ingot to ladle at 0.065-0.075% of antimony content.
Further, one or more antimony ingots of 20 kg/block are prepared in a proportion of 0.065% -0.075% before production.
Further, before production, 14 antimony ingots of 20 kg/block and 280kg are prepared according to the proportion of 0.065-0.075%.
The beneficial effects of the invention are as follows: the invention ensures that the content of Sb in the steel is stable and controlled, improves the qualification rate of components, and simultaneously avoids volatilization of toxic Sb vapor. The method has reference significance for smelting all the Sb-containing steel types, is simple to operate, does not increase the cost, has great significance for environmental protection, and can be popularized to other steel plants.
Drawings
FIG. 1 is a graph showing the correlation between the Sb yield and the tapping temperature.
Detailed Description
The invention is further described in detail by the following examples, namely, the Sb-containing steel 51 furnace is produced all year round in 2021, 280kg of antimony ingot is put into the furnace after tapping in a converter, the Sb yield is generally low before the temperature control of tapping in the converter, the Sb content of a finished product is mostly lower than the lower limit, the Sb yield is obviously increased after the tapping temperature is controlled between 1610 and 1640 ℃, and the Sb of the finished product can be stabilized between 0.65 and 0.75%.
The foregoing is merely illustrative of the present invention, and simple modifications and equivalents may be made thereto by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (3)
1. An antimony adding method for improving the yield of antimony in the steelmaking process is characterized in that: when the converter is smelted, the blowing stop temperature of the converter is controlled at 1610-1640 ℃, sampling is performed after tapping is finished to detect the sulfur content, and if the sulfur content meets the standard, the antimony ingot is added into the steel ladle according to the proportion of 0.065-0.075% of the antimony content.
2. The method for adding antimony to increase the yield of antimony in a steelmaking process according to claim 1, wherein: one or more antimony ingots of 20 kg/block are prepared according to the proportion of 0.065-0.075% before production.
3. The method for adding antimony to increase the yield of antimony in a steelmaking process according to claim 2, wherein: before production, 14 antimony ingots of 20 kg/block and 280kg are prepared according to the proportion of 0.065-0.075%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310235427.9A CN116590493A (en) | 2023-03-13 | 2023-03-13 | Antimony adding method for improving antimony yield in steelmaking process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310235427.9A CN116590493A (en) | 2023-03-13 | 2023-03-13 | Antimony adding method for improving antimony yield in steelmaking process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116590493A true CN116590493A (en) | 2023-08-15 |
Family
ID=87594408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310235427.9A Pending CN116590493A (en) | 2023-03-13 | 2023-03-13 | Antimony adding method for improving antimony yield in steelmaking process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116590493A (en) |
-
2023
- 2023-03-13 CN CN202310235427.9A patent/CN116590493A/en active Pending
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| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |