CA3031738C - Method for decarburization of high-carbon copper-containing molten iron by blowing co2 - Google Patents
Method for decarburization of high-carbon copper-containing molten iron by blowing co2 Download PDFInfo
- Publication number
- CA3031738C CA3031738C CA3031738A CA3031738A CA3031738C CA 3031738 C CA3031738 C CA 3031738C CA 3031738 A CA3031738 A CA 3031738A CA 3031738 A CA3031738 A CA 3031738A CA 3031738 C CA3031738 C CA 3031738C
- Authority
- CA
- Canada
- Prior art keywords
- molten iron
- copper
- containing molten
- induction furnace
- carbon
- 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.)
- Active
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 270
- 239000010949 copper Substances 0.000 title claims abstract description 149
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 144
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 143
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 135
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 90
- 238000007664 blowing Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 52
- 238000005261 decarburization Methods 0.000 title claims abstract description 37
- 230000006698 induction Effects 0.000 claims abstract description 77
- 239000002893 slag Substances 0.000 claims abstract description 44
- 238000003756 stirring Methods 0.000 claims abstract description 42
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000007789 gas Substances 0.000 claims description 17
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 15
- 239000003546 flue gas Substances 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 7
- 239000003638 chemical reducing agent Substances 0.000 claims description 4
- 229910002091 carbon monoxide Inorganic materials 0.000 abstract description 4
- 230000001590 oxidative effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 7
- 238000005507 spraying Methods 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 5
- 238000007599 discharging Methods 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000000844 anti-bacterial effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 241000219495 Betulaceae Species 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- VVTSZOCINPYFDP-UHFFFAOYSA-N [O].[Ar] Chemical compound [O].[Ar] VVTSZOCINPYFDP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- IYRDVAUFQZOLSB-UHFFFAOYSA-N copper iron Chemical compound [Fe].[Cu] IYRDVAUFQZOLSB-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910001105 martensitic stainless steel Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 150000003568 thioethers Chemical class 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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Provided is a method for decarburization of high-carbon copper-containing molten iron by blowing CO2, which belongs to the metallurgical field. The method includes the following steps of: (1) introducing the high-carbon copper-containing molten iron into an induction furnace; (2) blowing CO2 into the high-carbon copper-containing molten iron and performing stirring; (3) stopping performing blowing when the carbon mass content in the high-carbon copper-containing molten iron is smaller than or equal to 0.2%; (4) performing post-treatment on CO to generate CO2, enabling CO2 to be reused, and separating the copper-containing molten iron from molten slag. In the method, CO2 reacts with the carbon in melt to produce CO, and CO escapes and burns to reproduce CO2 for reuse. Moreover, CO2 is weak oxidizing gas and does not react with copper, while also has the dephosphorization and desiliconization functions. The method is simple in process.
Description
METHOD FOR DECARBURIZATION OF HIGH-CARBON
BACKGROUND OF THE INVENTION
1. Field of the Invention [0001] The invention belongs to the metallurgical field, and particularly relates to a method for decarburization of high-carbon copper-containing molten iron by blowing CO2.
BACKGROUND OF THE INVENTION
1. Field of the Invention [0001] The invention belongs to the metallurgical field, and particularly relates to a method for decarburization of high-carbon copper-containing molten iron by blowing CO2.
2. The Prior Arts [0002] China's blister copper production increases rapidly as the copper smelting technology develops quickly. At the same time, the volume of copper slag in storage rises greatly. By 2017, China's volume of copper slag in storage has reached million tons or above. Such a massive storage amount of waste occupies a lot of land and pollutes environment. The copper slag contains massive valuable metallic elements, the content of copper and iron is even higher than ore, and waste of the copper slag is also the waste of resources.
[0003] However, at the current time, the copper slag is mainly used in the respects of separately extracting copper or iron, and the recovery value is low. In order to extract copper and iron elements, the carbonaceous reducing agent is generally used to reduce oxides and sulfides in the copper slag. To ensure the good reduction effect, the carbonaceous reducing agent is added excessively in most cases, so that copper-iron alloys obtained contain a large amount of carbon, which makes the utilization value of the alloys be lowered. Making the copper-containing antibacterial stainless steel with the copper-containing molten iron requires decarburization.
Date Recue/Date Received 2020-04-24
Date Recue/Date Received 2020-04-24
[0004] Industrial decarburization methods include the general oxygen-blowing decarburization method and the vacuum decarburization method. Both of the methods are performed by blowing oxygen to react with carbon in alloys for decarburization, and methods are widely used in steel making with molten iron. For the copper-containing molten iron, the oxygen can cause the burning loss of copper elements.
02 [CUl = CU20
02 [CUl = CU20
[0005] The relative-low copper content is further reduced. However, application of the copper-containing molten iron requires a certain copper content.
Copper-containing antibacterial martensitic stainless steel requires a copper content of 2.5-4.0%; and if the copper content is too low, the addition of copper alloys in the follow-up process is needed, which is not economic.
Copper-containing antibacterial martensitic stainless steel requires a copper content of 2.5-4.0%; and if the copper content is too low, the addition of copper alloys in the follow-up process is needed, which is not economic.
[0006] Chinese patent publication No. 104099445A provides an RH
(Ruhrstahl Heraeus) fast decarburization method. The carbon content is reduced to 0.02-0.045%
through the terminal control of a converter and oxygen blowing control.
However, the method only relates to oxygen-blowing decarburization. Chinese patent publication No. 105316451A provides an RH forced oxygen-blowing decarburization method, and according to the method, the carbon content can be reduced to 9 ppm under the vacuum condition. However, this patent application does not relate to the decarburization of copper-containing molten iron but only the decarburization of molten iron. Chinese patent publication No. 105039649A provides a method for smelting low-carbon high-manganese molten iron in an argon oxygen decarburization furnace. However, the method does not relate to copper-containing molten iron decarburization either. Chinese patent publication No. 102146493A provides a method for smelting clean steel in an electromagnetic induction furnace by blowing CO2.
Date Recue/Date Received 2020-04-24 CO2 is blown for decarburization and the decarburization amount is controlled by a furnace gas analysis system. However, the method relates to neither an application of valuable metallic elements nor copper protection by decarburization.
SUMMARY OF THE INVENTION
(Ruhrstahl Heraeus) fast decarburization method. The carbon content is reduced to 0.02-0.045%
through the terminal control of a converter and oxygen blowing control.
However, the method only relates to oxygen-blowing decarburization. Chinese patent publication No. 105316451A provides an RH forced oxygen-blowing decarburization method, and according to the method, the carbon content can be reduced to 9 ppm under the vacuum condition. However, this patent application does not relate to the decarburization of copper-containing molten iron but only the decarburization of molten iron. Chinese patent publication No. 105039649A provides a method for smelting low-carbon high-manganese molten iron in an argon oxygen decarburization furnace. However, the method does not relate to copper-containing molten iron decarburization either. Chinese patent publication No. 102146493A provides a method for smelting clean steel in an electromagnetic induction furnace by blowing CO2.
Date Recue/Date Received 2020-04-24 CO2 is blown for decarburization and the decarburization amount is controlled by a furnace gas analysis system. However, the method relates to neither an application of valuable metallic elements nor copper protection by decarburization.
SUMMARY OF THE INVENTION
[0007] In accordance with the defects existing in oxygen decarburization, the invention provides a method for decarburization of high-carbon copper-containing molten iron by blowing CO2. CO2 reacts with the carbon in melt to produce CO, and CO escapes and burns to reproduce CO2. Moreover, CO2 is weak oxidizing gas and does not react with copper, while also has the dephosphorization and desiliconization functions. Reproduced CO2 is reused after being output.
[0008] The method is simple in process. A stirring system is arranged in the induction furnace, and the induction furnace is energy-saving, environmental-friendly, and low in cost. CO2 is adopted, and the method has high economic value and the function of environmental protection. The method not only can realize the purpose of decarburization, but also can protect the copper element from burning loss.
[0009] The method for decarburizing high-carbon copper-containing molten iron by blowing CO2, comprises the following steps of:
[0010] (1) Introducing the high-carbon copper-containing molten iron into an induction furnace, and ensuring a temperature of the high-carbon copper-containing molten iron to be greater than or equal to 1450 C,
[0011] (2) Blowing CO2 into the high-carbon copper-containing molten iron, and performing stirring, wherein a molar ratio of the CO2 to C in the high-carbon copper-containing molten iron is (1.2 to 1) - (1.5 to 1), and a blowing time is 20-80 min;
Date Recue/Date Received 2020-04-24
Date Recue/Date Received 2020-04-24
[0012] (3) Stopping performing spraying and blowing CO2 when a percentage by mass of carbon in the high-carbon copper-containing molten iron is smaller than or equal to 0.2%. Copper-containing molten iron and molten slag is obtained, and gas is collected, wherein the gas is produced CO and unreacted CO2;
[0013] (4) Performing a post-treatment on the CO, so that CO2 is produced, returning the CO2 to the induction furnace for reuse, and separating the copper-containing molten iron from the molten slag.
[0014] In the step (1), the high-carbon copper-containing molten iron is reduced molten high-carbon copper-containing molten iron obtained by adding a reducing agent to molten copper slag, and the temperature of the high-carbon copper-containing molten iron is 1450-1650 C;
[0015] In the step (1), the induction furnace comprises a slag discharge opening, a molten iron discharge opening and a gas blowing-in opening, wherein the gas blowing-in opening is a bottom blowing opening or a side blowing opening; the molten iron discharge opening is formed in a lower part on one side of the induction furnace, the slag discharge opening is formed in an upper part on the other side of the induction furnace, the bottom blowing opening is formed in a bottom of the induction furnace, and the side blowing opening is formed in the lower part on one side of the induction furnace;
[0016] The induction furnace is provided with a stirring paddle, an air hood and a flue gas purifying system, wherein the stirring paddle is eccentrically mounted at a top of the induction furnace; the air hood is arranged above the induction furnace, an inlet of the flue gas purifying system is connected with the air hood through a pipeline, and an outlet of the flue gas purifying system is connected with a gas blowing-in opening of the induction furnace through a pipeline;
Date Recue/Date Received 2020-04-24
Date Recue/Date Received 2020-04-24
[0017] The stirring system comprises the stirring paddle and a stirring paddle lifting system;
[0018] In the step (1), the launder is used for introducing the reduced molten high-carbon copper-containing molten iron into the induction furnace;
[0019] In the step (1), a method for ensuring the temperature of the high-carbon copper-containing molten iron to be greater than or equal to 1450 C is that the induction furnace is used for heating;
[0020] In the step (2), the CO2 is blown thereinto from the bottom of the induction furnace or the side of the induction furnace;
[0021] In the step (2), the stirring is performed by inserting the stirring paddle to 1/3-1/2 of the liquid level of copper-containing molten iron for eccentric stirring with an eccentricity of 0.1-0.8 and a stirring speed of 50-200 r/min, so that the CO2 is dispersed, and the CO2 and the melt can be thoroughly mixed;
[0022] In the step (4), the generated CO and the unreacted CO2 enter the flue gas purifying system through the air hood, the treated gas and 02 are mixed and burnt to generate CO2, and the CO2 is reused;
[0023] In the step (4), molten slag is placed in an upper layer of the induction furnace, and the copper-containing molten iron is placed in a lower layer of the induction furnace; and the molten slag is discharged from a slag discharge opening of the induction furnace, and the copper-containing molten iron is poured out of a molten iron discharge opening of the induction furnace.
[0024] Through the method disclosed by the invention, the carbon content in the copper-containing molten iron can be effectively reduced, so that the carbon mass content in the copper-containing molten iron is smaller than or equal to 0.2%.
Furthermore, the content of phosphorus and silicon can be reduced to a certain extent, Date Recue/Date Received 2020-04-24 and the copper content in molten iron is not reduced. Therefore, molten iron meets the requirements for steel making.
Furthermore, the content of phosphorus and silicon can be reduced to a certain extent, Date Recue/Date Received 2020-04-24 and the copper content in molten iron is not reduced. Therefore, molten iron meets the requirements for steel making.
[0025] The principle of decarburization is as follows:
CO2 + [C] = 2C0(g)
CO2 + [C] = 2C0(g)
[0026] Compared with conventional oxygen-blowing decarburization, the method for decarburization of high-carbon copper-containing molten iron by blowing CO2, disclosed by the invention has the following characteristics and beneficial effects:
[0027] 1. CO2 gas can be recycled. Produced CO2 has a certain temperature, and reacts with [C] in the melt for decarburization without preheating. During decarburization, copper is not oxidized, the effect of decarburization can be achieved, and burning loss of the copper can also be avoided. CO2 has an excellent effect when being used for treating molten iron containing valuable metallic elements;
[0028] 2. The method adopted by the invention can effectively utilize copper slag, so that waste is reduced;
[0029] 3. The method adopted by the invention can reduce emission of smoke and dust and is favorable for increment of yield, and environmental protection; and
[0030] 4. CO2 spraying and blowing adopted by the invention achieves the purpose of decarburization, and the sprayed and blown gas can also achieve the stirring function, so that the CO2 comes into full contact with high-carbon copper-containing molten iron to reach sufficient decarburization.
BRIEF DESCRIPTION OF THE DRAWINGS
BRIEF DESCRIPTION OF THE DRAWINGS
[0031] FIG. 1 shows a structure diagram of the induction furnace system in the method of the invention, wherein 1 indicates slag discharge opening, 2 indicates Date Recue/Date Received 2020-04-24 molten iron discharge opening, 3 indicates bottom blowing opening, 5 indicates air hood, 6 indicates flue gas purifying system, and 7 indicates stirring paddle;
[0032] FIG. 2 shows a structure diagram of the induction furnace system in the method of the invention, wherein 1 indicates slag discharge opening, 2 indicates molten iron discharge opening, 4 indicates side blowing opening, 5 indicates air hood, 6 indicates flue gas purifying system, and 7 indicates stirring paddle.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0033] The invention will be further detailed below in combination with embodiments.
Embodiment 1
Embodiment 1
[0034] High-carbon copper-containing molten iron is used in the embodiment of the invention. Table 1 shows the analysis results of elements in high-carbon copper-containing molten iron.
[0035] FIG. 1 shows the structure diagram of the induction furnace system in the embodiment.
[0036] The method for decarburization of high-carbon copper-containing molten iron by blowing CO2 comprises the following steps of:
[0037] (1) Introducing 20t reduced molten high-carbon copper-containing molten iron through the launder into the induction furnace as shown in Fig. 1, and heating the high-carbon copper-containing molten iron through the induction furnace to 1500 C;
[0038] (2) Inserting the stirring paddle 7 to 1/3 of the liquid level of the copper-containing molten iron through the stirring paddle lifting system for eccentric stirring with an eccentricity of 0.1 and a stirring speed of 50 r/min; and besides, Date Recue/Date Received 2020-04-24 blowing CO2 into the high-carbon copper-containing molten iron through the bottom blowing opening 3 in the bottom of the induction furnace, wherein the molar ratio of the CO2 to C in high-carbon copper-containing molten iron is 1.2: 1, and the spraying and the blowing time is 60 min;
[0039] (3) Stopping blowing CO2 when the carbon mass content in the high-carbon copper-containing molten iron is 0.2%, (at this time, the total blowing amount is 1000 m3), and obtaining copper-containing molten iron and molten slag, wherein the Cu mass content in the copper-containing molten iron is 5.25%, the C content is 0.2%, the P content is 0.05% and the Si content is 0.122%;
[0040] (4) Placing molten slag in the upper layer of the induction furnace, placing the copper-containing molten iron in the lower layer of the induction furnace, and discharging the molten slag from a slag discharge opening 1 of the induction furnace, and pouring out the copper-containing molten iron from a molten iron discharge opening 2 of the induction furnace; and
[0041] (5) Sending the generated CO and the unreacted CO2 to the flue gas purifying system 6 through the air hood 5, performing mixing and burning on the gas treated with CO and 02 to generate CO2, and performing reusing;
[0042] It can be seen that by adopting the method disclosed by the embodiments, the C content in the high-carbon copper-containing molten iron is remarkably reduced and the Cu content is basically unchanged, indicating that the method effectively achieves the purposes of decarburization and copper protection.
Embodiment 2
Embodiment 2
[0043] High-carbon copper-containing molten iron is used in the embodiment of the invention. Table 1 shows the analysis results of elements in high-carbon copper-containing molten iron.
Date Recue/Date Received 2020-04-24
Date Recue/Date Received 2020-04-24
[0044] FIG. 2 shows the structure diagram of the induction furnace system in the embodiment.
[0045] The method for decarburization of high-carbon copper-containing molten iron by blowing CO2, comprises the following steps of:
[0046] (1) Introducing 30t reduced molten high-carbon copper-containing molten iron through the launder into the induction furnace as shown in fig. 2, and heating the high-carbon copper-containing molten iron through the induction furnace to 1500 C;
[0047] (2) Inserting the stirring paddle 7 to 1/2 of the liquid level of the copper-containing molten iron through the stirring paddle lifting system for eccentric stirring with an eccentricity of 0.4 and a stirring speed of 100 r/min; and besides, blowing CO2 into the high-carbon copper-containing molten iron through the side blowing opening 4 in the bottom of the induction furnace, wherein the molar ratio of the CO2 to C in high-carbon copper-containing molten iron is 1.5 : 1, and the blowing time is 80 min;
[0048] (3) Stopping blowing CO2 when the carbon mass content in the high-carbon copper-containing molten iron is 0.09% (at this time, the total spraying and blowing amount is 1600 m3), and obtaining copper-containing molten iron and molten slag, wherein the Cu content in the copper-containing molten iron is 4.89 wt%, the C content is 0.09 wt%, the P content is 0.07 wt% and the Si content is 0.136 wt%;
[0049] (4) Placing molten slag in the upper layer of the induction furnace, placing the copper-containing molten iron in the lower layer of the induction furnace, and discharging the molten slag from a slag discharge opening 1 of the induction Date Recue/Date Received 2020-04-24 furnace, and pouring out the copper-containing molten iron from a molten iron discharge opening 2 of the induction furnace; and
[0050] (5) Sending the generated CO and the unreacted CO2 to the flue gas purifying system 6 through the air hood 5, performing mixing and burning on the gas treated with CO and 02 to generate CO2, and performing reusing;
Embodiment 3
Embodiment 3
[0051] High-carbon copper-containing molten iron is used in the embodiment of the invention. Table 1 shows the analysis results of elements in high-carbon copper-containing molten iron.
[0052] FIG. 2 shows the structure diagram of the induction furnace system in the embodiment.
[0053] The method for decarburization of high-carbon copper-containing molten iron by blowing CO2, comprises the following steps of:
[0054] (1) Introducing 30t reduced molten high-carbon copper-containing molten iron through the launder into the induction furnace as shown in fig. 2, and heating the high-carbon copper-containing molten iron through the induction furnace to 1450 C;
[0055] (2) Inserting the stirring paddle 7 to 1/2 of the liquid level of the copper-containing molten iron through the stirring paddle lifting system for eccentric stirring an eccentricity of 0.5 and a stirring speed of 100 r/min; and besides, blowing CO2 into the high-carbon copper-containing molten iron through the side blowing opening 4 in the bottom of the induction furnace, wherein the molar ratio of the CO2 to C in high-carbon copper-containing molten iron is 1.3 : 1, and the blowing time is 40 min;
Date Recue/Date Received 2020-04-24
Date Recue/Date Received 2020-04-24
[0056] (3) Stopping blowing CO2 when the carbon mass content in the high-carbon copper-containing molten iron is 0.15% (at this time, the total spraying and blowing amount is 1600 m3), and obtaining copper-containing molten iron and molten slag, wherein the Cu content in the copper-containing molten iron is 4.89 wt%, the C content is 0.15 wt%, the P content is 0.09 wt% and the Si content is 0.155 wt%;
[0057] (4) Placing molten slag in the upper layer of the induction furnace, placing the copper-containing molten iron in the lower layer of the induction furnace, and discharging the molten slag from a slag discharge opening 1 of the induction furnace, and pouring out the copper-containing molten iron from a molten iron discharge opening 2 of the induction furnace; and
[0058] (5) Sending the generated CO and the unreacted CO2 to the flue gas purifying system 6 through the air hood 5, performing mixing and burning on the gas treated with CO and 02 to generate CO2, and performing reusing.
Embodiment 4
Embodiment 4
[0059] High-carbon copper-containing molten iron is used in the embodiment of the invention. Table 1 shows the analysis results of elements in high-carbon copper-containing molten iron.
[0060] FIG. 2 shows the structure diagram of the induction furnace system in the embodiment.
[0061] The method for decarburization of high-carbon copper-containing molten iron by blowing CO2, comprises the following steps of:
[0062] (1) Introducing 30t reduced molten high-carbon copper-containing molten iron through the launder into the induction furnace as shown in fig. 2, and Date Recue/Date Received 2020-04-24 heating the high-carbon copper-containing molten iron through the induction furnace to 1650 C;
[0063] (2) Inserting the stirring paddle 7 to 1/2 of the liquid level of the copper-containing molten iron through the stirring paddle lifting system for eccentric stirring with an eccentricity of 0.3 and a stirring speed is 200 r/min; and besides, blowing CO2 into the high-carbon copper-containing molten iron through the side blowing opening 4 in the bottom of the induction furnace, wherein the molar ratio of the CO2 to C in high-carbon copper-containing molten iron is 1.5 : 1, and the blowing time is 20 min;
[0064] (3) Stopping blowing CO2 when the carbon mass content in the high-carbon copper-containing molten iron is 0.18% (at this time, the total spraying and blowing amount is 1600 m3), and obtaining copper-containing molten iron and molten slag, wherein the Cu content in the copper-containing molten iron is 4.89 wt%, the C content is 0.18 wt%, the P content is 0.06 wt% and the Si content is 0.236 wt%;
[0065] (4) Placing molten slag in the upper layer of the induction furnace, placing the copper-containing molten iron in the lower layer of the induction furnace, and discharging the molten slag from a slag discharge opening 1 of the induction furnace, and pouring out the copper-containing molten iron from a molten iron discharge opening 2 of the induction furnace; and
[0066] (5) Sending the generated CO and the unreacted CO2 to the flue gas purifying system 6 through the air hood 5, performing mixing and burning on the gas treated with CO and 02 to generate CO2, and performing reusing.
Embodiment 5 Date Recue/Date Received 2020-04-24
Embodiment 5 Date Recue/Date Received 2020-04-24
[0067] High-carbon copper-containing molten iron is used in the embodiment of the invention. Table 1 shows the analysis results of elements in high-carbon copper-containing molten iron.
[0068] FIG. 2 shows the structure diagram of the induction furnace system in the embodiment.
[0069] The method for decarburization of high-carbon copper-containing molten iron by blowing CO2, comprises the following steps of:
[0070] (1) Introducing 30t reduced molten high-carbon copper-containing molten iron through the launder into the induction furnace as shown in fig. 2, and heating the high-carbon copper-containing molten iron through the induction furnace to 1500 C;
[0071] (2) Inserting the stirring paddle 7 to 1/2 of the liquid level of the copper-containing molten iron through the stirring paddle lifting system for eccentric stirring with an eccentricity of 0.8 and a stirring speed is 150 r/min; and besides, blowing CO2 into the high-carbon copper-containing molten iron through the side blowing opening 4 in the bottom of the induction furnace, wherein the molar ratio of the CO2 to C in high-carbon copper-containing molten iron is 1.5: 1, and the blowing time is 80 min;
[0072] (3) Stopping blowing CO2 when the carbon mass content in the high-carbon copper-containing molten iron is 0.12% (at this time, the total spraying and blowing amount is 1600 m3), and obtaining copper-containing molten iron and molten slag, wherein the Cu content in the copper-containing molten iron is 4.89 wt%, the C content is 0.12 wt%, the P content is 0.08 wt% and the Si content is 0.113 wt%;
Date Recue/Date Received 2020-04-24
Date Recue/Date Received 2020-04-24
[0073] (4) Placing molten slag in the upper layer of the induction furnace, placing the copper-containing molten iron in the lower layer of the induction furnace, and discharging the molten slag from a slag discharge opening 4 of the induction furnace, and pouring out the copper-containing molten iron from a molten iron discharge opening 2 of the induction furnace; and
[0074] (5) Sending the generated CO and the unreacted CO2 to the flue gas purifying system 6 through the air hood 5, performing mixing and burning on the gas treated with CO and 02 to generate CO2, and performing reusing.
[0075] Table 1 (percentage by mass, %) -----.4.,,.....fisõ...... miles Embodiment Embodiment Embodiment Emb.o.diment.
Einb.a.dimErtn.
Element . 1 2 3 _ C L.6.7 338 ,L52 4..56 3.3.6.
? 0.08; .11'0 0.130 0.09 0.140 S 0.011 0. Or.:1 0.010 0_007 0..i1l15 sinallier than smaller than stnaller than smaller than sitialler than I ,. (1'.4 0_01 0_01 C .01 G. 0 1 Obi Si 0_338 D...240 C..328 0236 0_313 snialler than smaller than small at- than smaller than smaller than Cr 41.01 0.0 i C.:.:1 0.01 0.01 Zn 0.019 0.036.: C .C28 C.C33 D. D26.:
sinallier than smaller than small,r than s.maller than sitiallier than 1.;.
0_01 0_01 C .01 obi 0.01 1Cu 5_26 4_92 .5.66. 5_45 Fie 89..1 90_6 818; 89_3 90_2 Other Remainder Remainder. 11'. ' =alder Remainder. Remainder.
Date Recue/Date Received 2020-04-24
Einb.a.dimErtn.
Element . 1 2 3 _ C L.6.7 338 ,L52 4..56 3.3.6.
? 0.08; .11'0 0.130 0.09 0.140 S 0.011 0. Or.:1 0.010 0_007 0..i1l15 sinallier than smaller than stnaller than smaller than sitialler than I ,. (1'.4 0_01 0_01 C .01 G. 0 1 Obi Si 0_338 D...240 C..328 0236 0_313 snialler than smaller than small at- than smaller than smaller than Cr 41.01 0.0 i C.:.:1 0.01 0.01 Zn 0.019 0.036.: C .C28 C.C33 D. D26.:
sinallier than smaller than small,r than s.maller than sitiallier than 1.;.
0_01 0_01 C .01 obi 0.01 1Cu 5_26 4_92 .5.66. 5_45 Fie 89..1 90_6 818; 89_3 90_2 Other Remainder Remainder. 11'. ' =alder Remainder. Remainder.
Date Recue/Date Received 2020-04-24
Claims (8)
1. A method for decarburization of high-carbon copper-containing molten iron by blowing CO2, the method comprising the following steps of:
(1) introducing the high-carbon copper-containing molten iron into an induction furnace, and ensuring a temperature of the high-carbon copper-containing molten iron to be between 1450-1650°C, wherein the high-carbon copper-containing molten iron is reduced molten high-carbon copper-containing molten iron obtained by adding a reducing agent to molten copper slag;
(2) blowing CO2 into the high-carbon copper-containing molten iron, and performing stirring, wherein a molar ratio of the CO2 to C contained in the high-carbon copper-containing molten iron is (1.2 to 1)-(1.5 to 1), and a blowing time is 20-80 min;
(3) stopping performing blowing of CO2 when a percentage by mass of carbon in the high-carbon copper-containing molten iron is smaller than or equal to 0.2%, obtaining copper-containing molten iron and molten slag, and collecting gas, wherein the gas consists of produced CO and unreacted CO2;
and (4) performing a post-treatment on the CO, so that CO2 is produced, returning the CO2 to the induction furnace for reuse, and separating the copper-containing molten iron from the molten slag.
(1) introducing the high-carbon copper-containing molten iron into an induction furnace, and ensuring a temperature of the high-carbon copper-containing molten iron to be between 1450-1650°C, wherein the high-carbon copper-containing molten iron is reduced molten high-carbon copper-containing molten iron obtained by adding a reducing agent to molten copper slag;
(2) blowing CO2 into the high-carbon copper-containing molten iron, and performing stirring, wherein a molar ratio of the CO2 to C contained in the high-carbon copper-containing molten iron is (1.2 to 1)-(1.5 to 1), and a blowing time is 20-80 min;
(3) stopping performing blowing of CO2 when a percentage by mass of carbon in the high-carbon copper-containing molten iron is smaller than or equal to 0.2%, obtaining copper-containing molten iron and molten slag, and collecting gas, wherein the gas consists of produced CO and unreacted CO2;
and (4) performing a post-treatment on the CO, so that CO2 is produced, returning the CO2 to the induction furnace for reuse, and separating the copper-containing molten iron from the molten slag.
2. The method according to claim 1, wherein in the step (1), the induction furnace is provided with a stirring paddle, an air hood and a flue gas purifying system, wherein the stirring paddle is eccentrically mounted at a top of the induction furnace; the air hood is arranged above the induction furnace, an inlet of the flue gas purifying system is connected with the air hood through a pipeline, and an outlet of the flue gas purifying system is connected with a gas blowing-in opening of the induction furnace through another pipeline.
3. The method according to claim 1, wherein in the step (1), a launder is used for introducing the reduced molten high-carbon copper-containing molten iron into the induction furnace.
4. The method according to claim 1, wherein in the step (1), a method for ensuring the temperature of the high-carbon copper-containing molten iron to be between 1450-1650°C is that the induction furnace is heated.
5. The method according to claim 1, wherein in the step (2), CO2 is blown into the high-carbon copper-containing molten iron from a bottom or side of the induction furnace.
6. The method according to claim 1, wherein in the step (2), the stirring is performed by inserting a stirring paddle to 1/3-1/2 of a liquid level of the copper-containing molten iron for eccentric stirring with an eccentricity of 0.1-0.8 and a stirring speed of 50-200 r/min.
7. The method according to claim 1, wherein in the step (4), the molten slag is placed in an upper layer of the induction furnace, and the copper-containing molten iron is placed in a lower layer of the induction furnace; and the molten slag is discharged from a slag discharge opening of the induction furnace, and the copper-containing molten iron is poured out of a molten iron discharge opening of the induction furnace.
8. The method according to claim 2, wherein the produced CO and the unreacted CO2 are collected into the flue gas purifying system through the air hood, the produced CO and 02 are mixed and burnt to produce CO2, and the produced CO2 and unreacted CO2 are reused.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201610851740.5 | 2016-09-27 | ||
CN201610851740.5A CN106191379B (en) | 2016-09-27 | 2016-09-27 | A kind of injection CO2The method for removing carbon in high-carbon cupric molten iron |
PCT/CN2017/082310 WO2018058953A1 (en) | 2016-09-27 | 2017-04-28 | Method of removing carbon in high-carbon copper-containing molten iron by injection of carbon dioxide |
Publications (2)
Publication Number | Publication Date |
---|---|
CA3031738A1 CA3031738A1 (en) | 2018-04-05 |
CA3031738C true CA3031738C (en) | 2021-01-12 |
Family
ID=57520719
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA3031738A Active CA3031738C (en) | 2016-09-27 | 2017-04-28 | Method for decarburization of high-carbon copper-containing molten iron by blowing co2 |
Country Status (4)
Country | Link |
---|---|
CN (1) | CN106191379B (en) |
AU (1) | AU2017333112B2 (en) |
CA (1) | CA3031738C (en) |
WO (1) | WO2018058953A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106191379B (en) * | 2016-09-27 | 2018-10-23 | 东北大学 | A kind of injection CO2The method for removing carbon in high-carbon cupric molten iron |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1508591A (en) * | 1974-02-26 | 1978-04-26 | Nixon I | Manufacture of alloy steels and ferrous alloys |
CN1297672C (en) * | 2005-03-25 | 2007-01-31 | 北京科技大学 | Electric steelmaking process by blowing CO2 gas |
JP5285895B2 (en) * | 2007-11-13 | 2013-09-11 | 日本冶金工業株式会社 | Stainless steel refining method |
JP2010248536A (en) * | 2009-04-10 | 2010-11-04 | Sumitomo Metal Ind Ltd | Method for manufacturing high manganese content metal |
CN102146493B (en) * | 2010-02-05 | 2013-05-29 | 鞍钢股份有限公司 | Method for smelting clean steel in electromagnetic induction furnace by blowing CO2 |
CN102251070B (en) * | 2011-07-18 | 2012-11-07 | 北京科技大学 | Method for implementing efficient extraction of vanadium from converter through CO2 |
CN104775006A (en) * | 2014-01-09 | 2015-07-15 | 宝山钢铁股份有限公司 | Furnace gas analysis model-based decarburization control method of vacuum oxygen decarburization refining |
CN103776272A (en) * | 2014-03-05 | 2014-05-07 | 北京大学 | Converter gas mass-energy conversion and CO2 cycle steelmaking method |
CN104928439B (en) * | 2015-07-08 | 2017-11-17 | 北京科技大学 | One kind utilizes CO2The method that dephosphorization efficiency is improved in duplex converter |
CN106191379B (en) * | 2016-09-27 | 2018-10-23 | 东北大学 | A kind of injection CO2The method for removing carbon in high-carbon cupric molten iron |
-
2016
- 2016-09-27 CN CN201610851740.5A patent/CN106191379B/en active Active
-
2017
- 2017-04-28 WO PCT/CN2017/082310 patent/WO2018058953A1/en active Application Filing
- 2017-04-28 AU AU2017333112A patent/AU2017333112B2/en active Active
- 2017-04-28 CA CA3031738A patent/CA3031738C/en active Active
Also Published As
Publication number | Publication date |
---|---|
AU2017333112B2 (en) | 2020-04-30 |
CA3031738A1 (en) | 2018-04-05 |
CN106191379B (en) | 2018-10-23 |
AU2017333112A1 (en) | 2019-02-07 |
CN106191379A (en) | 2016-12-07 |
WO2018058953A1 (en) | 2018-04-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN102264919B (en) | Method for reclaiming iron and phosphorus from steelmaking slag | |
CN109022644B (en) | Method for recovering slag desulfurization and dephosphorization in cooperation with ferrite in full-three-removal process | |
CN108998628B (en) | Low-cost deoxidation process for killed steel | |
CA3031738C (en) | Method for decarburization of high-carbon copper-containing molten iron by blowing co2 | |
Mendez et al. | Effect of process conditions on the evolution of MgO content of inclusions during the production of calcium treated, aluminum killed steels | |
EP0092652B1 (en) | Apparatus for treating molten metal and method for refining steel melts | |
AU2017333111B2 (en) | Method of removing carbon in copper-containing molten iron by using vortex to draw in limestone | |
CN211689138U (en) | System for utilize induction heating jetting to handle rich manganese slag stove molten iron | |
CN107326170B (en) | Process for treating metal surface waste | |
CN107236844B (en) | Smelting method and production process of clean steel | |
JP3505198B2 (en) | Treatment of zinc-containing steelmaking dust | |
JP2009144179A (en) | Method for utilizing iron source recovered from steelmaking slag | |
JP2007009240A (en) | Method for reusing converter dust | |
CN110724839A (en) | Preparation method of manganese-rich slag | |
US4436553A (en) | Process to produce low hydrogen steel | |
CN211057207U (en) | Preparation device of manganese-rich slag | |
TW201402827A (en) | Dephosphorizing agent for steelmaking and steelmaking method of reducing phosphorus content | |
CN110016571B (en) | Copper-containing cast iron production system | |
JP2011208172A (en) | Decarburize-refining method in converter using iron-scrap as iron source | |
JPH0225511A (en) | Method for increasing generating gas quality of converter using waste tire | |
CN110551865A (en) | system and process for treating molten iron of manganese-rich slag furnace by utilizing induction heating and blowing | |
JP2002069520A (en) | Method for recovering chromium in slag | |
Shakhpazov et al. | Slag recycling in ferrous metallurgy | |
CN103397245A (en) | Method for improving smelting quality of molten ductile iron | |
JPH11217246A (en) | Prevention of powdering of reduced slag |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request |
Effective date: 20190118 |