CN114015834A - Novel calcium alloy dearsenicating agent and dearsenicating method - Google Patents
Novel calcium alloy dearsenicating agent and dearsenicating method Download PDFInfo
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- CN114015834A CN114015834A CN202111307717.7A CN202111307717A CN114015834A CN 114015834 A CN114015834 A CN 114015834A CN 202111307717 A CN202111307717 A CN 202111307717A CN 114015834 A CN114015834 A CN 114015834A
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 25
- 229910000882 Ca alloy Inorganic materials 0.000 title claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 86
- 239000010959 steel Substances 0.000 claims abstract description 86
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 65
- 239000000956 alloy Substances 0.000 claims abstract description 65
- 239000011575 calcium Substances 0.000 claims abstract description 44
- 229910052785 arsenic Inorganic materials 0.000 claims abstract description 39
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910014458 Ca-Si Inorganic materials 0.000 claims abstract description 28
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 28
- 229910014460 Ca-Fe Inorganic materials 0.000 claims abstract description 24
- 238000006243 chemical reaction Methods 0.000 claims abstract description 17
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052786 argon Inorganic materials 0.000 claims abstract description 7
- 238000007664 blowing Methods 0.000 claims abstract description 7
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 230000001590 oxidative effect Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 11
- 238000003756 stirring Methods 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000012535 impurity Substances 0.000 abstract description 3
- 238000007667 floating Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 15
- 229910000676 Si alloy Inorganic materials 0.000 description 11
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 description 11
- 229910000640 Fe alloy Inorganic materials 0.000 description 8
- WNQQFQRHFNVNSP-UHFFFAOYSA-N [Ca].[Fe] Chemical compound [Ca].[Fe] WNQQFQRHFNVNSP-UHFFFAOYSA-N 0.000 description 8
- 239000002893 slag Substances 0.000 description 7
- 229910052742 iron Inorganic materials 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 238000009628 steelmaking Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 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
- 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
- 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
- C21C7/072—Treatment with gases
Abstract
The invention discloses a novel calcium alloy dearsenization agent and a dearsenization method, which are characterized in that the dearsenization agent comprises a Ca-Fe alloy and a Ca-Si alloy, wherein the Ca-Fe alloy comprises 25-35% of Ca and 65-75% of Fe by mass percent; Ca-Si alloy contains Ca 25-35% and Si 65-75%. The method of adding the novel calcium alloy dearsenization agent for multiple times is adopted to gradually remove arsenic in the molten steel, in order to ensure that the dearsenization reaction is fully carried out, the stirring is required to be enhanced, the standing time of the molten steel is reserved to promote the dearsenization product to float upwards and be removed, the argon blowing state or the vacuum state is kept in the whole dearsenization process, and the molten steel is prevented from being oxidized by air. After the arsenic removal is adopted, the arsenic content in the molten steel is reduced from 0.11% to 0.048%, the arsenic removal rate is 56.36%, and the arsenic removal effect is good. Compared with other dearsenization methods, the method has good dearsenization effect, is beneficial to floating and removing impurities, reduces material loss, and is economical, cost-effective and convenient to operate. The added novel calcium-based alloy dearsenization agent does not pollute molten steel while dearsenizing, is beneficial to controlling the quantity, the size and the components of inclusions in the steel, and improves the performance of steel products.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a novel calcium alloy dearsenifying agent and a dearsenifying method.
Background
Based on the consideration of various factors such as resources, cost and performance, steel is still the main material of the current, but with the development of science and technology, the requirements of more and more tools and materials on the use performance are continuously improved, steel products face huge pressure replaced by novel engineering materials such as aluminum, glass, high polymer materials, composite materials and the like, and steel materials face greater and greater challenges. With the development of modern advanced technologies such as aerospace, national defense, petrochemical engineering, atomic energy engineering, ocean engineering and the like, the requirements on the quality of steel materials are continuously improved, harmful residual elements in steel are required to be reduced, and the purity of steel is improved.
In the steel smelting process, some harmful residual elements such as arsenic and the like are inevitably present. On one hand, low-grade iron ore resources are gradually used along with the exhaustion of high-grade iron ore resources (for example, arsenic-containing iron ore is largely used in the south of China); on the other hand, because of the recycling of steel, the short-process scrap steel making yield is increased year by year, and the scrap steel adding proportion in the steel making process is improved. The recycling of low-grade iron ore and scrap results in an increase in the content of low-melting residual elements such as arsenic in the steel. Because steel products can be recycled infinitely, the existing classification and treatment technology of scrap steel is not perfect, and thus residual elements in steel are enriched continuously. The content of harmful residual elements is very low, but the harmful residual elements can cause great influence on the performance of steel, wherein arsenic can be aggregated in a grain boundary in a steel product to cause tempering brittleness; the steel product is easy to generate hot brittle cracks in the hot working process; when the content of arsenic as an impurity exceeds a certain level, serious component segregation is caused, and a low-hardness granular compound is generated, so that weldability and impact properties are reduced, and the strength, plasticity and the like of the steel are also reduced.
In view of the above, in order to effectively reduce the arsenic content in molten steel, a novel dearsenicating agent system and a dearsenicating method need to be invented. It is required to have strong arsenic removal capability and no pollution to molten steel.
Disclosure of Invention
The invention aims to provide a novel calcium alloy dearsenifying agent and a dearsenifying method, which can solve the problems that the prior dearsenifying agent has low efficiency and large material loss, and the dearsenifying product easily pollutes molten steel, and the like, achieve good dearsenifying effect and are beneficial to producing high-quality steel products.
The invention is realized by adopting a novel calcium alloy dearsenization agent, wherein the dearsenization agent comprises Ca-Fe alloy and Ca-Si alloy, and the Ca-Fe alloy contains 25-35% of Ca and 65-75% of Fe by mass percent; Ca-Si alloy contains Ca 25-35% and Si 65-75%.
The novel calcium-based alloy dearsenization agent comprises the following components in percentage by weight, wherein the ratio of Ca-Fe alloy to Ca-Si alloy is 1.5-2.5: 1.
the novel calcium alloy dearsenic agent has the usage amount of 5-15% of molten steel by weight.
In the novel calcium-based alloy dearsenic agent, P is less than or equal to 0.06 percent and S is less than or equal to 0.04 percent in the Ca-Fe alloy; p in the Ca-Si alloy is less than or equal to 0.04 percent, and S in the Ca-Si alloy is less than or equal to 0.04 percent.
A novel dearsenization method of a calcium alloy dearsenization agent comprises the steps of adding a Ca-Fe alloy and a Ca-Si alloy into molten steel for 3-6 times, stirring for 1-2 minutes each time, stirring for 1-2 minutes again after the dearsenization agent is completely added, standing the molten steel for 3-5 minutes, and performing dearsenization reaction to reduce the arsenic content in the molten steel.
The preparation method of the novel calcium alloy dearsenization agent can keep the argon blowing state or the vacuum state during dearsenization reaction to prevent air from oxidizing molten steel.
Compared with the prior art, the invention has the following advantages;
the dearsenization agent has the dearsenization effect of calcium, when calcium alloy is added into molten steel, part of calcium can be gasified and dearsenization reaction can be carried out at the interface of slag steel; part of calcium can be dissolved in the molten steel and carries out dearsenification reaction in the molten steel; the de-arsenic reaction equation is therefore:
[Ca]+2/3[As]＝1/3(Ca3As2)
(Ca)+2/3[As]＝1/3(Ca2As3)
the calcium-silicon alloy is a composite alloy composed of elements of silicon and calcium, and is an ideal composite deoxidizer, desulfurizer and dearsenizer. And is suitable for being used as a warming agent for a converter steelmaking workshop. The dearsenization product after the calcium-silicon alloy dearsenization is easy to float and discharge, and can also improve the performance of steel and improve the plasticity, impact toughness and fluidity of the steel. The invention adds calcium-silicon alloy into molten steel for dearsenization of molten steel and can improve the performance of steel.
The calcium-iron alloy is a composite alloy composed of elements of calcium and iron, and is often used as a deoxidizer in steel making and added into molten steel. The invention adopts the method that the calcium-iron alloy is added into the molten steel, thereby not only realizing dearsenification of the molten steel, but also reducing the oxygen content and the sulfur content in the molten steel.
When the dearsenization agent is used for dearsenization, the dearsenization agent is added for multiple times, the mixture is stirred for 1-2 minutes after each addition, and then the mixture is kept stand for 3-5 minutes. The stirring is to promote the calcium to fully react with the arsenic in the molten steel, and the standing is favorable for the arsenic removal product to float to the slag for removal.
The main advantages of the invention are as follows:
(1) when the invention is used for dearsenization, calcium has great affinity to oxygen, sulfur and arsenic, and can play a good dearsenization role. Because the melting point of the metal calcium is low (839 ℃), the vapor pressure is high, the reaction is violent when the metal calcium is directly added into the molten steel, and the loss is large. And adopts calcium-iron alloy and calcium-silicon alloy as dearsenization agent. Therefore, the problems that metal calcium is directly added in the production, the metal calcium is easy to burn and damage, and the reaction is violent to generate splashing are solved.
(2) The invention is used for dearsenifying the molten steel, and the calcium-iron alloy and the calcium-silicon alloy are added into the molten steel for dearsenifying. The calcium-iron alloy has good arsenic removal effect, and the added calcium-silicon alloy has the arsenic removal effect and can promote deoxidation and desulfurization, thereby further promoting the arsenic removal effect. And the calcium-silicon alloy is added, so that the low-melting-point nonmetal impurities which are easy to float upwards and remove are formed in the molten steel, the deoxidation and dearsenization products float upwards into the slag, the calcium-silicon alloy has stable reaction and good performance, the utilization rate of calcium can be improved, and the requirements of most of production can be met. Therefore, the calcium iron alloy and the calcium silicon alloy are adopted for dearsenifying, and the method has better advantages.
(3) The dearsenization product of the invention does not pollute molten steel, and calcium in the dearsenization agent can also refine crystal grains and change the components, the quantity and the form of nonmetallic inclusions; the corrosion resistance, the wear resistance, the high temperature resistance and the low temperature resistance of the steel are improved; the shaping, impact toughness, fatigue strength and welding performance of the steel are improved; the hot cracking resistance, the hydrogen cracking resistance and the lamellar resistance of the steel are enhanced.
(4) In conclusion, compared with the prior art, the dearsenization agent has the advantages of good dearsenization effect, easy floating and removal of dearsenization products, high utilization rate of calcium, grain refinement, inclusion improvement and steel performance improvement. Solves the key problem in the prior arsenic removal technology.
To demonstrate the effectiveness of the present invention, the experiments were as follows:
the raw materials are as follows, and the following related percentages are weight percentages; the chemical composition of the experimental steels is shown in table 1.
Table 1 experiment base material composition (%)
The calcium-iron alloy comprises 30 percent of Ca-70 percent of Fe and is used in an amount of 6 percent of the molten steel, and the calcium-silicon alloy comprises 30 percent of Ca-70 percent of Si and is used in an amount of 4 percent of the molten steel. Adopts quaternary slag system as refining slag used in experiments, and the components of the quaternary slag system are CaO 55% -SiO215％-Al2O322 to 8 percent of MgO, and the using amount of the MgO is 10 percent of the molten steel.
350 g of experimental parent metal and 35 g of refining slag are put into a tubular resistance furnace to be heated to 1600 ℃ for melting, the molten steel is kept in an argon blowing state, and the arsenic content in the molten steel is measured to be 0.11% by sampling. And standing for 15 minutes, sequentially adding the calcium-silicon alloy and the calcium-iron alloy dearsenization agent into the molten steel, adding the dearsenization agent for 6 times, stirring for two minutes after each addition, and standing for three minutes until all the dearsenization agent is added.
After the arsenic removal, the arsenic content in the molten steel is reduced from 0.11% to 0.048%, the arsenic removal rate is 56.36%, and the arsenic removal effect is good. Compared with other dearsenization methods, the method has better dearsenization effect, reduces material loss, is economical and cost-effective, and is convenient to operate. The calcium content in the molten steel is less than 10ppm, the added calcium does not pollute the molten steel, and the added calcium can improve the quantity, size and components of inclusions in the steel and improve the performance of steel. Experiments prove that the subsequent refining process after arsenic removal is the same as the conventional process adopted by the existing factory by adopting the arsenic removal effect of the invention.
Detailed Description
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention. Various modifications and improvements of the technical solution of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, and the technical solution of the present invention is to be covered by the protection scope defined by the claims.
Example 1. A novel calcium-based alloy dearsenization agent comprises a Ca-Fe alloy and a Ca-Si alloy, wherein the Ca-Fe alloy comprises 25-35% of Ca and 65-75% of Fe by mass percent; Ca-Si alloy contains Ca 25-35% and Si 65-75%.
The ratio of Ca-Fe alloy and Ca-Si alloy is 1.5-2.5: 1.
the use amount of the dearsenic agent is 5-15% of the molten steel by weight.
In the Ca-Fe alloy, P is less than or equal to 0.06 percent, and S is less than or equal to 0.04 percent; p in the Ca-Si alloy is less than or equal to 0.04 percent, and S in the Ca-Si alloy is less than or equal to 0.04 percent.
A novel dearsenization method of a calcium alloy dearsenization agent comprises the steps of adding a Ca-Fe alloy and a Ca-Si alloy into molten steel for 3-6 times, stirring for 1-2 minutes each time, stirring for 1-2 minutes again after the dearsenization agent is completely added, standing the molten steel for 3-5 minutes, and performing dearsenization reaction to reduce the arsenic content in the molten steel.
And during the arsenic removal reaction, the argon blowing state is kept to prevent air from oxidizing the molten steel.
Example 2. A novel calcium-based alloy dearsenization agent comprises a Ca-Fe alloy and a Ca-Si alloy, wherein the Ca-Fe alloy comprises, by mass, 28-32% of Ca, 68-72% of Fe, less than or equal to 0.06% of P, and less than or equal to 0.04% of S; in the Ca-Si alloy, 28-32% of Ca, 68-72% of Si, less than or equal to 0.04% of P and less than or equal to 0.04% of S.
The ratio of the Ca-Fe alloy and the Ca-Si alloy is 2: 1, the dosage of the dearsenic agent is 10 percent of the molten steel.
A novel dearsenization method of a calcium alloy dearsenization agent comprises the steps of adding a Ca-Fe alloy and a Ca-Si alloy into molten steel for 5 times, stirring for 2 minutes each time, stirring for 2 minutes after the dearsenization agent is completely added, standing for 4 minutes, and performing dearsenization reaction to reduce the arsenic content in the molten steel.
And during the arsenic removal reaction, the argon blowing state is kept to prevent air from oxidizing the molten steel.
Example 3. A novel calcium-based alloy dearsenization agent comprises a Ca-Fe alloy and a Ca-Si alloy, wherein the Ca-Fe alloy comprises 27-30% of Ca, 70-73% of Fe, less than or equal to 0.04% of P and less than or equal to 0.03% of S by mass percent; in the Ca-Si alloy, 27-30% of Ca, 70-73% of Si, less than or equal to 0.03% of P and less than or equal to 0.03% of S.
The ratio of the Ca-Fe alloy and the Ca-Si alloy is 1.8: 1, the dosage of the dearsenic agent is 12 percent of the molten steel.
A novel dearsenization method of a calcium alloy dearsenization agent comprises the steps of adding a Ca-Fe alloy and a Ca-Si alloy into molten steel for 5 times, stirring for 2 minutes each time, stirring for 2 minutes after the dearsenization agent is completely added, standing for 4 minutes, and performing dearsenization reaction to reduce the arsenic content in the molten steel.
And during the arsenic removal reaction, the argon blowing state is kept to prevent air from oxidizing the molten steel.
Claims (6)
1. A novel calcium-based alloy dearsenization agent is characterized in that the dearsenization agent comprises Ca-Fe alloy and Ca-Si alloy, wherein the Ca-Fe alloy comprises 25-35% of Ca and 65-75% of Fe by mass percent; Ca-Si alloy contains Ca 25-35% and Si 65-75%.
2. The novel calcium-based alloy dearsenifying agent according to claim 1, wherein the ratio of the Ca-Fe alloy to the Ca-Si alloy is 1.5 to 2.5: 1.
3. the novel calcium-based alloy dearsenifying agent according to claim 1, wherein the dearsenifying agent is used in an amount of 5 to 15% by weight based on the molten steel.
4. The novel calcium-based alloy dearsenifying agent as set forth in claim 1, wherein P is 0.06% or less and S is 0.04% or less; p in the Ca-Si alloy is less than or equal to 0.04 percent, and S in the Ca-Si alloy is less than or equal to 0.04 percent.
5. The method for removing arsenic from a calcium alloy arsenic removing agent as claimed in any one of claims 1 to 4, wherein the Ca-Fe alloy and the Ca-Si alloy are added to the molten steel 3 to 6 times, the mixture is stirred for 1 to 2 minutes each time, the mixture is stirred again for 1 to 2 minutes after the arsenic removing agent is completely added, and the molten steel is allowed to stand for 3 to 5 minutes to perform the arsenic removing reaction, thereby reducing the arsenic content in the molten steel.
6. The method for preparing a novel calcium-based alloy dearsenifying agent according to claim 5, wherein the argon blowing state or the vacuum state is maintained during the dearsenifying reaction to prevent air from oxidizing molten steel.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103642990A (en) * | 2013-12-06 | 2014-03-19 | 江苏大学 | Molten steel dearsenication fluxing agent, and preparation method and application method thereof |
| WO2020255917A1 (en) * | 2019-06-17 | 2020-12-24 | Ｊｆｅスチール株式会社 | METHOD FOR ADDING Ca TO MOLTEN STEEL |
-
2021
- 2021-11-05 CN CN202111307717.7A patent/CN114015834A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103642990A (en) * | 2013-12-06 | 2014-03-19 | 江苏大学 | Molten steel dearsenication fluxing agent, and preparation method and application method thereof |
| WO2020255917A1 (en) * | 2019-06-17 | 2020-12-24 | Ｊｆｅスチール株式会社 | METHOD FOR ADDING Ca TO MOLTEN STEEL |
Non-Patent Citations (2)
| Title |
|---|
| 刘守平等: "钢液和铁水硅钙合金脱砷研究", 《特殊钢》 * |
| 罗林根等: "钢水中有害元素砷的脱除", 《过程工程学报》 * |
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Application publication date: 20220208 |