CA3031738A1 - 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
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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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
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 slags in storage rises greatly. By 2017, China's volume of copper slags 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 slags contain massive valuable metallic elements, the content of copper and iron is even higher than ore, and waste of the copper slags is also the waste of resources.
[0003] However, at the current time, the copper slags are 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 slags. 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.
[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 + [Cu] = Cu20
02 + [Cu] = 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 application No. 201410337369.1 provides an RH 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 application No.
201510802460.0 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 application No. 201510471169.X 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 application No. 201010108198.7 provides a method for smelting clean steel in an electromagnetic induction furnace by blowing CO2. 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
201510802460.0 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 application No. 201510471169.X 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 application No. 201010108198.7 provides a method for smelting clean steel in an electromagnetic induction furnace by blowing CO2. 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, CO, is weak oxidizing gas and does not react with copper, while also has the dephosphorization and desiliconization functions. Reproduced CO, 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 CO,, comprises the following steps of:
[0010] (I) 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 CO, 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;
[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 slags is obtained, and gas is collected, wherein the gas is produced CO and unreacted CO,;
[0013] (4) Performing 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 slags.
[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 slags, 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;
[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 CO, 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 slags are 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 slags are 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, 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, 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 slags, 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. CO,) 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 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 I500 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, 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 CO, 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 slags, 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 slags 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 slags 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 CO, 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.
[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 CO? 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 CO?
spraying and blowing amount is 1600 m3), and obtaining copper-containing molten iron and molten slags, 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%;
spraying and blowing amount is 1600 m3), and obtaining copper-containing molten iron and molten slags, 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 slags 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 slags 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
[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;
[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 slags, 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 slags 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 slags from a slag discharge opening I 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.
100601 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 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 CO-) spraying and blowing amount is 1600 m3), and obtaining copper-containing molten iron and molten slags, 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 slags 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 slags from a slag discharge opening I 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 [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 C01, 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 CO, 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 CO-, spraying and blowing amount is 1600 m3), and obtaining copper-containing molten iron and molten slags, 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%;
-[0073] (4) Placing molten slags 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 slags 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 I (percentage by mass, %) Embodiment Ernbod.iment Embodiment EMbOdimexit Embodiment 1 ., Elem-ent. YN.._.,_- - 3 5 '-C 4.6-7 3.38 4.52 4.3.'; .;.9.5 P 0.08 0.120 0.130 0.09 C.1.:.C=
S 0.011 0.00 0.010 0;0Ø7 0.005 smaller than mailer than smaller than smaller than smaller than 0.01 0.01 CC: 0.01 ,õ,,, -Si 0.338 0.240 0.328 0.2315 smaller than smaller than miller than smatter than smaller than Cr 0.01 0.01 0.01 0.01 0.01 it' i. 0.019 0.036 0.028 0.033 0.026 smaller than smaller than smaller than smaller than smaller than Pb 0.01 0.01 0.01 0.01 0.01 Cu 5.2.5 .2..32 5.66 5.15 5.1.8 Fe 89.1 90.6 38.3 89.3 90.2 Other Remainder Remainder Remainder Remainder Remainder
100601 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 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 CO-) spraying and blowing amount is 1600 m3), and obtaining copper-containing molten iron and molten slags, 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 slags 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 slags from a slag discharge opening I 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 [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 C01, 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 CO, 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 CO-, spraying and blowing amount is 1600 m3), and obtaining copper-containing molten iron and molten slags, 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%;
-[0073] (4) Placing molten slags 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 slags 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 I (percentage by mass, %) Embodiment Ernbod.iment Embodiment EMbOdimexit Embodiment 1 ., Elem-ent. YN.._.,_- - 3 5 '-C 4.6-7 3.38 4.52 4.3.'; .;.9.5 P 0.08 0.120 0.130 0.09 C.1.:.C=
S 0.011 0.00 0.010 0;0Ø7 0.005 smaller than mailer than smaller than smaller than smaller than 0.01 0.01 CC: 0.01 ,õ,,, -Si 0.338 0.240 0.328 0.2315 smaller than smaller than miller than smatter than smaller than Cr 0.01 0.01 0.01 0.01 0.01 it' i. 0.019 0.036 0.028 0.033 0.026 smaller than smaller than smaller than smaller than smaller than Pb 0.01 0.01 0.01 0.01 0.01 Cu 5.2.5 .2..32 5.66 5.15 5.1.8 Fe 89.1 90.6 38.3 89.3 90.2 Other Remainder Remainder Remainder Remainder Remainder
Claims (7)
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 greater than or equal to 1450°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 slags, and the temperature of the high-carbon copper-containing molten iron is 1450-1650°C;
(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;
(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 slags, and collecting gas, wherein the gas is produced CO and unreacted CO2; and (4) performing 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 slags.
(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, 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 slags, and the temperature of the high-carbon copper-containing molten iron is 1450-1650°C;
(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;
(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 slags, and collecting gas, wherein the gas is produced CO and unreacted CO2; and (4) performing 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 slags.
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 a 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 greater than or equal to 1450°C is that the induction furnace is used for heating.
5. The method according to claim 1, wherein in the step (2), CO2 is blown thereinto 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 slags are 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 slags are 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.
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| 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 |
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| 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 |
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| 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 |
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