CN114369728A - Top-blown oxidation-reduction method for refining furnace - Google Patents
Top-blown oxidation-reduction method for refining furnace Download PDFInfo
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- CN114369728A CN114369728A CN202111482018.6A CN202111482018A CN114369728A CN 114369728 A CN114369728 A CN 114369728A CN 202111482018 A CN202111482018 A CN 202111482018A CN 114369728 A CN114369728 A CN 114369728A
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- crude copper
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- 238000007670 refining Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000033116 oxidation-reduction process Effects 0.000 title abstract description 15
- 238000007664 blowing Methods 0.000 claims abstract description 80
- 239000007921 spray Substances 0.000 claims abstract description 71
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 61
- 229910052802 copper Inorganic materials 0.000 claims abstract description 59
- 239000010949 copper Substances 0.000 claims abstract description 59
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 37
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 37
- 239000001301 oxygen Substances 0.000 claims abstract description 37
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 34
- 230000003647 oxidation Effects 0.000 claims abstract description 25
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 25
- 239000007789 gas Substances 0.000 claims abstract description 19
- 230000009467 reduction Effects 0.000 claims abstract description 19
- 239000003345 natural gas Substances 0.000 claims abstract description 17
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000002485 combustion reaction Methods 0.000 claims abstract description 11
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 11
- 239000011593 sulfur Substances 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 8
- 229910052751 metal Inorganic materials 0.000 claims abstract description 8
- 238000009434 installation Methods 0.000 claims abstract description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 40
- 229910052757 nitrogen Inorganic materials 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 238000004321 preservation Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000010790 dilution Methods 0.000 claims description 4
- 239000012895 dilution Substances 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 claims description 2
- 239000011449 brick Substances 0.000 abstract description 11
- 238000012423 maintenance Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000006722 reduction reaction Methods 0.000 description 13
- 230000002035 prolonged effect Effects 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical compound [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000010301 surface-oxidation reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B15/00—Obtaining copper
- C22B15/0026—Pyrometallurgy
- C22B15/0028—Smelting or converting
- C22B15/0052—Reduction smelting or converting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B15/00—Obtaining copper
- C22B15/0026—Pyrometallurgy
- C22B15/0028—Smelting or converting
- C22B15/003—Bath smelting or converting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
- F27D2003/162—Introducing a fluid jet or current into the charge the fluid being an oxidant or a fuel
- F27D2003/163—Introducing a fluid jet or current into the charge the fluid being an oxidant or a fuel the fluid being an oxidant
- F27D2003/164—Oxygen
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
- F27D2003/162—Introducing a fluid jet or current into the charge the fluid being an oxidant or a fuel
- F27D2003/165—Introducing a fluid jet or current into the charge the fluid being an oxidant or a fuel the fluid being a fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
- F27D2003/166—Introducing a fluid jet or current into the charge the fluid being a treatment gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
- F27D2003/168—Introducing a fluid jet or current into the charge through a lance
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a top-blown redox method of a refining furnace, which comprises the steps of firstly inserting a top-blown spray gun into the furnace from a spray gun hole of a refining furnace body through a lifting device, and then connecting the top-blown spray gun with a gas supply metal hose to complete equipment installation; when the crude copper melt enters the refining furnace, a top-blowing spray gun is used for blowing oxygen to support combustion and preserve heat, when the crude copper melt in the refining furnace body reaches more than 300t, a crude copper melt sample is taken to analyze the oxygen and sulfur content, the time and the gas flow of required oxidation are calculated, then compressed air and oxygen-enriched air are introduced into the top-blowing spray gun to be oxidized, after the oxidation is finished, natural gas is introduced through the top-blowing spray gun to carry out top-blowing reduction, and after the reduction is finished, the top-blowing spray gun is switched to preserve heat. The invention reduces the use frequency of the brick bodies of the oxidation-reduction port and the furnace mouth by a top-blown oxidation-reduction technology, prolongs the service life of the brick bodies in vulnerable areas, realizes the efficient long-period stable operation of the refining furnace, reduces the frequency of maintenance and repair, and saves materials and maintenance cost.
Description
Technical Field
The invention belongs to the technical field of metal metallurgy, and particularly relates to a top-blown redox method of a refining furnace.
Background
The flash converting process is a suspension reaction, the sulfur content of the crude copper is high (about 0.1 percent), the refining furnace can utilize the material waiting gap to carry out pre-oxidation (about 2 hours) only after the raw copper is fed to 300t, and reduction can be carried out after formal oxidation for 3 hours is needed after the feeding is finished. When the blister copper contains more than 0.1% of sulfur, the oxidation time is still longer.
The oxidation-reduction mode of the refining furnace at the present stage is mainly that an oxidation-reduction opening is built, a pre-formed oxidation-reduction opening is prefabricated, and the like, a brick body and an oxidation-reduction gun are immersed below the copper liquid, and blown compressed air and a reducing agent are in direct contact with the copper liquid to generate oxidation-reduction reaction. The brick body in the area is particularly seriously scoured and worn, the service life of the brick body is only about 1 month, and the service life can be reduced after the oxidation-reduction time is prolonged. Simultaneously, the refining furnace heating uses rare oxygen combustion system, and natural gas and oxygen are blown in from headwall department and are kept warm, heat up, because of refining furnace is great, flame position also can change when the refining furnace is in different operation positions, and the position barrel brick that leads to being close to end department burns and decreases comparatively seriously, influences the refining furnace life-span.
Disclosure of Invention
Aiming at the problems, the invention provides a top-blowing oxidation reduction method for a refining furnace, which is used for carrying out oxidation reduction on a crude copper melt in the refining furnace through top blowing, so that the copper content in slag of the smelting furnace is reduced, and the service life of equipment can be prolonged.
The invention is realized by the following technical scheme:
a top-blown redox method of a refining furnace comprises the following steps:
(1) inserting a top-blowing spray gun into the refining furnace from a spray gun hole of the refining furnace body through a lifting device, and then connecting the top-blowing spray gun with a gas supply metal hose to complete equipment installation; the lifting device is connected with the winch through a lifting steel wire rope;
(2) when the crude copper melt in the converting furnace enters the refining furnace, a top-blowing spray gun is used for blowing oxygen for supporting combustion and preserving heat, and when the crude copper melt fed into the refining furnace body for the first time reaches more than 300t, a crude copper melt sample is taken for analyzing the oxygen and sulfur content;
(3) calculating the time and gas flow rate required to be oxidized according to the oxygen and sulfur content in the crude copper melt, then introducing compressed air and oxygen-enriched air into the top-blowing spray gun for oxidation, and continuously adjusting the height of the top-blowing spray gun according to the height of the liquid level of the crude copper melt to enable the height of the top-blowing spray gun to be 50-150 mm away from the liquid level of the crude copper melt;
(4) after the feeding is finished, taking a crude copper melt sample for observation, and judging whether the oxidation needs to be continuously carried out or not according to the appearance and the cross-section state of the crude copper melt; after the oxidation of the crude copper melt is finished, introducing natural gas through a top-blowing spray gun to carry out top-blowing reduction;
(5) switching the top-blowing spray gun to heat preservation after reduction is finished, and adjusting the position of the top-blowing spray gun to be 0.8-1.2 m away from the liquid level of the crude copper melt through a winch in the process that the refining furnace body rotates to copper discharging;
(6) the method comprises the steps of detecting the condition of a top-blowing spray gun from a spray gun hole regularly, pulling out the top-blowing spray gun through a winch and replacing the top-blowing spray gun with a new top-blowing spray gun when the height of the top-blowing spray gun does not meet production requirements, cutting off the head of the old top-blowing spray gun, welding the old top-blowing spray gun again for one section, and repairing the old top-blowing spray gun for use.
According to the invention, oxygen-enriched air and natural gas are continuously supplied to the refining furnace from the top of the refining furnace for oxidation reduction of the crude copper melt, the sulfur content of the crude copper is reduced, direct contact between a top-blowing spray gun and the crude copper melt is avoided, the use frequency of an oxidation reduction port and a furnace port brick body is reduced, and the service life of equipment is prolonged.
Furthermore, the top-blown spray gun comprises a nitrogen cooling outer pipe, a middle gas pipe, a central inner pipe and a pipeline joint;
the middle gas pipe, the nitrogen cooling outer pipe and the central inner pipe are coaxially arranged from outside to inside in sequence; the pipeline joint is connected with an air supply metal hose;
introducing nitrogen into the nitrogen cooling outer pipe for cooling;
the middle gas pipe is introduced with oxygen for oxidation and combustion supporting during oxidation and heat preservation, and is introduced for dilution during reduction, so that the reduction utilization rate of natural gas is improved.
Furthermore, the lifting device comprises a lifting steel wire rope, a lifting guide rail, a pulley and a hoisting mechanism; one end of the lifting steel wire rope is connected with the top-blowing spray gun through the lifting lug, and the other end of the lifting steel wire rope penetrates through the pulley at the top of the lifting guide rail and is connected with the winch.
The lifting of the top-blowing spray gun is realized by rotationally tightening or loosening the lifting steel wire rope through the winch. The pulley can use fixed pulley or movable pulley, installs at the riser guide top, and riser guide mainly makes as structural support through calculating selection channel-section steel or I-steel, uses the bolt to fix on the good base of welding, conveniently dismantles the change.
The invention has the following beneficial effects:
1. the method continuously supplies oxygen-enriched air to the refining furnace through top blowing oxidation of the refining furnace, and utilizes the feeding and waiting materials to carry out surface oxidation on the crude copper melt, thereby reducing the sulfur content of the crude copper and shortening the oxidation time.
2. According to the invention, the top-blown oxygen-enriched air and the reducing agent are blown from the top of the refining furnace, the top-blown spray gun is positioned above the copper liquid, and the brick body of the furnace body and the top-blown spray gun are not in direct contact with the crude copper melt, so that the use frequency of the brick body at the oxidation reduction port and the fire hole is reduced, the erosion and scouring are reduced, the service life of the brick body in a vulnerable area is prolonged, the efficient long-period stable operation of the refining furnace is realized, the frequency of maintenance is reduced, and the material and the maintenance cost are saved.
3. The top-blown spray gun can not only realize redox operation, but also realize heat preservation and temperature rise of copper liquid through natural gas combustion, and the combustion flame is directly contacted with the crude copper melt, so that the heat utilization rate is improved; meanwhile, the heat radiation to the hearth can be controlled by adjusting the height of the top-blowing spray gun, the temperature of the hearth is uniform, the burning loss of bricks is reduced, and the service life of the refining furnace is prolonged.
4. The invention can control the formal oxidation time of the refining furnace within 2h and the single-furnace operation period of the refining furnace within 22h by the top-blown oxidation-reduction technology, thereby realizing the matching with the high-load production of a flash converting system.
Drawings
Fig. 1 is a schematic view of the overall installation structure of the present invention.
FIG. 2 is a schematic view of the top-blowing lance of the present invention.
Reference numerals: 1-refining furnace body, 2-crude copper melt, 3-top blowing spray gun, 301-nitrogen cooling outer pipe, 302-middle gas pipe, 303-center inner pipe, 304-pipeline joint, 4-lifting steel wire rope, 5-lifting guide rail, 6-pulley and 7-winch.
Detailed Description
The invention will be further explained with reference to the drawings.
Example 1
A top-blown redox method of a refining furnace comprises the following steps:
(1) installation of equipment
As shown in fig. 1, a top-blowing lance 3 is inserted into a refining furnace from a lance hole of a furnace body 1 of the refining furnace through a lifting device, and then the top-blowing lance 3 is connected with a gas supply metal hose to complete equipment installation; the lifting device is connected with the winch 7 through a lifting steel wire rope 4;
the top-blown lance 3 comprises a nitrogen cooling outer pipe 301, an intermediate gas pipe 302, a central inner pipe 303 and a pipe joint 304 as shown in FIG. 2; the middle gas pipe 302, the nitrogen cooling outer pipe 301 and the middle inner pipe 303 are coaxially arranged from outside to inside in sequence; the pipeline joint 304 is connected with a gas supply metal hose; the nitrogen cooling outer pipe 301 is filled with nitrogen for cooling; the middle gas pipe 302 is introduced with oxygen for oxidation and combustion supporting during oxidation and heat preservation, and is introduced for dilution during reduction, so that the reduction utilization rate of natural gas is improved;
one end of the lifting steel wire rope 4 is connected with the top-blowing spray gun 3 through a lifting lug, and the other end of the lifting steel wire rope passes through a pulley 6 at the top of the lifting guide rail 5 and is connected with a winch 7.
(2) Production conditions
When the crude copper melt 2 in the converting furnace enters the refining furnace, the top-blowing spray gun 3 is used for blowing oxygen for oxidation combustion supporting and heat preservation, meanwhile, a sample of the crude copper melt 2 is taken for oxygen and sulfur content analysis, the feeding state in the refining furnace body 1 is kept, and when the crude copper melt 2 in the refining furnace body 1 reaches 300t, sampling calculation is carried out.
(3) Calculation of the technology
According to the oxygen and sulfur content in the crude copper melt 2, calculating to obtain that the oxygen content of the crude copper is 0.3%, the nitrogen pressure is 0.5MPa, the oxygen concentration of compressed air is 21%, the pressure is 0.7MPa, the oxygen concentration of oxygen is 100%, the pressure is 0.8MPa, the oxygen-enriched concentration is 40%, the oxygen utilization rate is 60%, the time required for feeding 650t to full charge is 6h, and the oxygen content of the crude copper at the oxidation end point is 0.8%;
the required 40 percent oxygen-enriched air volume for increasing the oxygen content of 650t of crude copper from 0.3 percent to 0.8 percent is 10500Nm3, and the required oxygen flow and the required compressed air flow are 2500Nm respectively3And 8000Nm3Therefore, the single top-blowing lance 3 is set as follows: the flow rate of cooling nitrogen was 100Nm3H, compressed air flow 670Nm3Per, oxygen flow 210Nm3The number of the top-blowing lances 3 used was 2/h.
(4) Top blown oxidation
And adjusting the height of the top-blowing spray gun 3 according to the data calculated by the process and the height of the liquid level of the crude copper melt 2 to ensure that the height of the top-blowing spray gun 3 from the liquid level of the crude copper melt 2 is 100mm, and then carrying out top-blowing oxidation.
(5) Top blown reduction
After the oxidation of the crude copper melt 2 is finished, introducing natural gas through a top-blowing spray gun 3 to carry out top-blowing reduction; 300t of crude copper melt 2 in the furnace, 0.8 percent of oxygen content of the crude copper, 0.5MPa of nitrogen pressure, 0.5MPa of natural gas pressure, dilution of the natural gas concentration to 50 percent by using nitrogen, 60 percent of natural gas reduction utilization rate and 2h of reduction time;
the amount of natural gas required to reduce the oxygen content of 650t of blister copper from 0.8% to 0.2% was 2700Nm3Therefore, the single top-blowing lance 3 is set as follows: the flow rate of cooling nitrogen was 150Nm3Per, natural gas flow 675Nm3Nitrogen flow 675 Nm/h3The number of the top-blowing lances 3 used was 2/h.
And adjusting the height of the top-blowing spray gun 3 according to the data calculated by the process and the height of the liquid level of the crude copper melt 2 to ensure that the height of the top-blowing spray gun 3 from the liquid level of the crude copper melt 2 is 150mm, and then carrying out top-blowing reduction.
(6) After reduction, the top-blowing spray gun 3 is switched to heat preservation, the refining furnace body 1 rotates to the copper discharging process, when the surplus of the crude copper melt 2 in the furnace is 100t, the nitrogen pressure is 0.5MPa, the natural gas pressure is 0.5MPa, the oxygen pressure is 0.8MPa, the combustion oxygen-fuel ratio is 2.1, and the single top-blowing spray gun 3 is set as follows during the heat preservation period through calculation: the flow rate of cooling nitrogen was 50Nm3Per, natural gas flow 100Nm3Per, oxygen flow 210Nm3The number of the top-blowing spray guns 3 is 2;
and adjusting the height of the top-blowing spray gun 3 according to the data calculated by the process and the height of the liquid level of the crude copper melt 2 to enable the height of the top-blowing spray gun 3 to be 1m away from the liquid level of the crude copper melt 2, and then carrying out top-blowing heat preservation.
(7) The condition of the top-blowing spray gun 3 is detected from the spray gun hole regularly, when the height of the top-blowing spray gun 3 does not meet the production requirement, the top-blowing spray gun 3 is pulled out and replaced by a new top-blowing spray gun 3 through the winch 7, and the gun head of the old top-blowing spray gun 3 is cut off and then welded again for one section to be repaired and used.
The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made thereto by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should be considered as falling within the scope of the present invention.
Claims (3)
1. A top-blown redox method of a refining furnace is characterized by comprising the following steps:
(1) inserting a top-blowing spray gun (3) into a refining furnace from a spray gun hole of a refining furnace body (1) through a lifting device, and then connecting the top-blowing spray gun (3) with a gas supply metal hose to complete equipment installation; the lifting device is connected with the winch (7) through a lifting steel wire rope (4);
(2) when the crude copper melt (2) in the converting furnace enters the refining furnace, a top-blowing spray gun (3) is used for blowing oxygen for supporting combustion and preserving heat, and when the crude copper melt (2) fed into the refining furnace body (1) for the first time reaches more than 300t, a crude copper melt (2) sample is taken for analyzing the oxygen and sulfur content;
(3) calculating the time and gas flow rate required to be oxidized according to the oxygen and sulfur content in the crude copper melt (2), then introducing compressed air and oxygen-enriched air into the top-blowing spray gun (3) for oxidation, and continuously adjusting the height of the top-blowing spray gun (3) according to the height of the liquid level of the crude copper melt (2) to ensure that the height of the top-blowing spray gun (3) from the liquid level of the crude copper melt (2) is 50-150 mm;
(4) after feeding is finished, taking a sample of the crude copper melt (2) for observation, and judging whether oxidation needs to be continuously carried out or not according to the appearance and the cross-section state of the crude copper melt (2); after the oxidation of the crude copper melt (2) is finished, introducing natural gas through a top-blowing spray gun (3) to carry out top-blowing reduction;
(5) after the reduction is finished, the top-blowing spray gun (3) is switched to be insulated, and in the process that the refining furnace body (1) rotates to discharge copper, the position of the top-blowing spray gun (3) is adjusted by a winch (7) to enable the distance between the top-blowing spray gun and the liquid level of the crude copper melt (2) to be 0.8-1.2 m;
(6) the condition of the top-blowing spray gun (3) is detected from the spray gun hole regularly, when the height of the top-blowing spray gun (3) does not meet the production requirement, the top-blowing spray gun (3) is pulled out and replaced by a new top-blowing spray gun (3) through a winch (7), and the gun head of the old top-blowing spray gun (3) is cut off and then welded again for one section for repair and use.
2. The method of refining furnace top-blown redox according to claim 1, characterized in that: the top-blown lance (3) comprises a nitrogen cooling outer pipe (301), a middle gas pipe (302), a central inner pipe (303) and a pipeline joint (304);
the middle gas pipe (302), the nitrogen cooling outer pipe (301) and the central inner pipe (303) are coaxially arranged from outside to inside in sequence; the pipeline joint (304) is connected with a gas supply metal hose;
the nitrogen cooling outer pipe (301) is filled with nitrogen for cooling;
the middle gas pipe (302) is introduced with oxygen for oxidation and combustion supporting during oxidation and heat preservation, and is introduced for dilution during reduction, so that the reduction utilization rate of natural gas is improved.
3. The method of refining furnace top-blown redox according to claim 1, characterized in that: the lifting device comprises a lifting steel wire rope (4), a lifting guide rail (5), a pulley (6) and a hoisting mechanism (7); one end of the lifting steel wire rope (4) is connected with the top-blowing spray gun (3) through a lifting lug, and the other end of the lifting steel wire rope passes through a pulley (6) at the top of the lifting guide rail (5) and is connected with a winch (7).
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| CN202111482018.6A CN114369728B (en) | 2021-12-07 | 2021-12-07 | Top-blown oxidation-reduction method for refining furnace |
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| CN202111482018.6A CN114369728B (en) | 2021-12-07 | 2021-12-07 | Top-blown oxidation-reduction method for refining furnace |
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000080419A (en) * | 1998-09-01 | 2000-03-21 | Mitsubishi Materials Corp | Smelting furnace |
| JP2005068532A (en) * | 2003-08-28 | 2005-03-17 | Jfe Steel Kk | Smelting method through top-blowing oxygen |
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| JP2005068532A (en) * | 2003-08-28 | 2005-03-17 | Jfe Steel Kk | Smelting method through top-blowing oxygen |
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