CN111471833A - Desulfurization pretreatment process for molten iron for casting - Google Patents
Desulfurization pretreatment process for molten iron for casting Download PDFInfo
- Publication number
- CN111471833A CN111471833A CN202010460352.0A CN202010460352A CN111471833A CN 111471833 A CN111471833 A CN 111471833A CN 202010460352 A CN202010460352 A CN 202010460352A CN 111471833 A CN111471833 A CN 111471833A
- Authority
- CN
- China
- Prior art keywords
- molten iron
- desulfurization
- tank
- blowing
- magnesium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
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
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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
The invention discloses a desulfurization pretreatment process for molten iron for casting, which comprises the following steps of: firstly, adding blast furnace molten iron into a molten iron tank, pre-slagging the molten iron in the molten iron tank by using a slagging-off machine, and measuring and sampling the temperature of the molten iron; secondly, spraying a desulfurizing agent into the hot metal ladle by adopting a spraying and blowing method for desulfurization; thirdly, slagging-off, measuring the temperature and sampling, wherein a slagging-off machine is adopted to carry out slagging-off treatment on the molten iron in the molten iron tank, and the temperature and sampling are carried out on the desulfurized molten iron; fourthly, adding the mixture into a converter; the desulfurization pretreatment process for molten iron for casting improves the utilization rate of a desulfurizer, and has good desulfurization effect and high desulfurization efficiency.
Description
Technical Field
The invention relates to a molten iron pretreatment method, relates to a desulfurization pretreatment process of molten iron for casting, and belongs to the technical field of molten iron pretreatment for casting.
Background
The pretreatment of molten iron refers to a treatment process for removing or extracting a certain component from molten iron before the molten iron is added to a steel-making furnace, such as external desulfurization, desulfurization and desilication of molten iron; among them, the desulfurization methods are most widely a stirring method and a blowing method. The mechanical stirring method is that a stirrer is sunk into molten iron to rotate, and a conical vortex is formed in the molten iron, so that the molten iron and a desulfurizing agent are fully mixed; the blowing method is to mix the desulfurizing agent with gas and blow the mixture into molten iron by using dry air or inert gas as a carrier, and simultaneously stir the molten iron to achieve the aim of desulfurization. In terms of molten iron temperature drop, the rapid stirring method can increase the molten iron temperature drop and has higher requirements on the molten iron temperature; furthermore, the service life of the mixing head is relatively short compared to the lance of the blowing method. From the view of dynamics, compared with a mechanical stirring method, the blowing method has the advantages of poorer dynamic conditions, easy resulfurization and low utilization rate of a desulfurizer, and by taking the blowing passivated magnesium powder as an example, the highest record in the world is not more than 50%, and the domestic best is about 40%; the low utilization rate of the magnesium powder is closely related to the floating time of the formed magnesium steam bubble in the molten iron; the floating time is related to a bubble floating path, and for the blowing method, the bubble floating path is from the outlet of the spray gun to the surface of the ladle, and the floating path can be considered to be linear. Therefore, the invention provides a desulfurization pretreatment process for molten iron for casting, which improves the resulfurization problem and improves the desulfurization efficiency; and the blowing structure of the blowing method is improved, so that the blowing bubble route can be changed in the blowing process, the spraying range of the spray gun is expanded, and the utilization rate of the desulfurizer is improved.
Disclosure of Invention
In order to solve the problems, the invention provides a desulfurization pretreatment process for molten iron for casting, which improves the utilization rate of a desulfurizer, and has good desulfurization effect and high desulfurization efficiency.
The invention relates to a desulphurization pretreatment process of molten iron for casting, which comprises the following steps:
firstly, adding blast furnace molten iron into a molten iron tank, pre-slagging the molten iron in the molten iron tank by using a slagging-off machine, and measuring and sampling the temperature of the molten iron;
secondly, spraying a desulfurizing agent into the hot metal ladle by adopting a spraying and blowing method for desulfurization;
1) a blowing system is adopted to pre-blow a lime-based desulfurizer into the hot metal ladle for desulfurization;
2) a blowing system is adopted to blow lime-based desulfurizer and magnesium-based desulfurizer with a predetermined proportion into the hot metal ladle for desulfurization;
3) secondarily blowing a lime-based desulfurizer into the hot metal ladle by using a blowing system for final desulfurization;
in order to ensure the desulfurization and slagging-off effects, slagging-off, temperature measurement and sampling procedures can be carried out after each blowing desulfurization;
thirdly, slagging-off, measuring the temperature and sampling, wherein a slagging-off machine is adopted to carry out slagging-off treatment on the molten iron in the molten iron tank, and the temperature and sampling are carried out on the desulfurized molten iron;
fourthly, adding into the converter.
Further, the lime-based desulfurizer consists of the following raw materials in percentage by weight: 80-90% of coated lime, 8-12% of fluorite and 4-8% of calcium carbonate.
Further, the magnesium-based desulfurizing agent consists of the following raw materials in percentage by weight: 65-81% of passivated coal powder, 10-15% of magnesium oxide and 8-12% of magnesium carbonate.
Further, the weight ratio of the lime-based desulfurizer to the magnesium-based desulfurizer in the composite blowing in the second step is 3: 1-4: 1.
Further, in the second step, the blowing speed of the desulfurizer powder in the blowing system is 65-81 kg/min, and the carrier gas flow rate is 51-72 m for carrying out thin film vapor transmission.
In a preferable embodiment, in the slagging-off, temperature measurement and sampling processes in the third step, after the desulfurization injection is finished and 70% of the molten iron tank is subjected to normal slagging-off, an air blowing head of the slagging-off machine is inserted into the surface of the molten iron and is blown with nitrogen, and slag on the liquid surface is pushed to a tank opening by using a blown liquid flow field for stacking, so that the slagging-off machine can remove the desulfurization slag as clean as possible during slagging-off operation.
Further, the blowing system comprises a first powder storage tank for storing the lime-based desulfurizer, a second powder storage tank for storing the magnesium-based desulfurizer, a first powder spraying tank for blowing a certain amount of the lime-based desulfurizer to the hot metal ladle, a discharge end of the first powder spraying tank is provided with a rotary feeder, a second powder spraying tank for blowing a certain amount of the magnesium-based desulfurizer to the hot metal ladle, a gas supply device for conveying nitrogen gas and connected with the first powder spraying tank and the second powder spraying tank through pipelines, and a spray gun for spraying the lime-based desulfurizer and/or the magnesium-based desulfurizer into the hot metal ladle and inserting the spray gun into the hot metal ladle from the top of the hot metal ladle; the spray gun is connected with a powder supply pipeline.
In a preferred embodiment, the lance is inserted at its lower end to a depth of not more than 0.8 times the depth of the molten iron solution in the molten iron tank.
Furthermore, the upper end of the spray gun is movably arranged above the hot metal ladle through a supporting hanger; a lifting platform is arranged on the supporting hanger; the lifting platform is connected with the supporting hanger through a lifting cylinder; the upper end of the spray gun is fixedly arranged on the lower bottom surface of the lifting platform through a mounting seat.
Furthermore, a rotating motor is arranged on the lifting platform; a rotating shaft of the rotating motor is connected with a mounting seat of the spray gun through a transmission shaft; the mounting seat is movably mounted on the lower bottom surface of the lifting platform through a bearing seat assembly; the rotating motor is fixed above the lifting platform through the motor frame.
Compared with the prior art, the desulfurization pretreatment process for the molten iron for casting adopts the lime-based desulfurizer and the magnesium-based desulfurizer to carry out composite desulfurization, is favorable for improving the desulfurization efficiency of magnesium and lime in the molten iron, can reduce the temperature drop of the molten iron due to the exothermic reaction of the magnesium powder, can generate strong stirring action of magnesium powder steam, prevents resulfurization after the molten iron is saturated by the magnesium powder, can drive the flow rate of the magnesium-based desulfurizer to prevent the magnesium powder of the magnesium-based desulfurizer from floating upwards by taking the magnesium-based desulfurizer as a carrier, can fully react in the molten iron, is favorable for realizing deep desulfurization, can control the generation of magnesium steam bubbles through the lime powder and prevent the desulfurization slag from violently splashing with iron, can movably install the spray gun above the molten iron tank through a supporting hanger, can drive the spray gun to move up and down through the lifting platform, can move up and down in the height direction of the molten iron tank, is convenient to control the spraying height of the spray gun, increases the spraying range of the desulfurizer, and can control the lifting platform in an intermittent control mode through P L C connected with the lifting air cylinder to control the spray gun to move up and contact with the molten iron tank, so that the molten iron can fully react with the molten iron and.
Drawings
Fig. 1 is a schematic structural view of a blowing system according to embodiment 1 of the present invention.
Fig. 2 is a schematic view of a mounting structure of a spray gun according to embodiment 2 of the present invention.
The components in the drawings are labeled as: 1-a hot metal ladle, 2-a first powder storage tank, 3-a second powder storage tank, 4-a first powder spraying tank, 5-a second powder spraying tank, 6-a pipeline, 7-a spray gun, 8-a motor frame, 11-a support hanging bracket, 12-a lifting platform, 13-a lifting cylinder, 14-a mounting seat, 15-a rotating motor, 16-a transmission shaft and 17-a bearing seat assembly.
Detailed Description
Example 1:
the invention relates to a desulphurization pretreatment process of molten iron for casting, which comprises the following steps:
firstly, adding blast furnace molten iron into a molten iron tank, pre-slagging the molten iron in the molten iron tank by using a slagging-off machine, and measuring and sampling the temperature of the molten iron;
secondly, spraying a desulfurizing agent into the hot metal ladle by adopting a spraying and blowing method for desulfurization;
1) a blowing system is adopted to pre-blow a lime-based desulfurizer into the hot metal ladle for desulfurization; controlling the blowing speed of the lime-based desulfurizer to be 71-75 kg/min, and controlling the flow rate of carrier gas to be 55-60 m/min;
2) a blowing system is adopted to perform composite blowing on a lime-based desulfurizer and a magnesium-based desulfurizer with a weight ratio of 3: 1-4: 1 in a hot metal ladle for desulfurization; controlling the blowing speed of the lime-based desulfurizer to be 71-80 kg/min, and controlling the flow rate of carrier gas to be 65-72 m/min; controlling the blowing speed of the magnesium-based desulfurizer to be 65-73 kg/min, and controlling the flow of carrier gas to be 51-61 m/min;
3) secondarily blowing a lime-based desulfurizer into the hot metal ladle by using a blowing system for final desulfurization; controlling the blowing speed of the lime-based desulfurizer to be 68-75 kg/min, and controlling the flow of carrier gas to be 55-62 m/min;
in order to ensure the desulfurization and slagging-off effects, slagging-off, temperature measurement and sampling processes can be carried out after each blowing desulfurization;
thirdly, slagging-off, measuring the temperature and sampling, wherein a slagging-off machine is adopted to carry out slagging-off treatment on the molten iron in the molten iron tank, and the temperature and sampling are carried out on the desulfurized molten iron; when the desulfurization injection is finished and 70% of the molten iron tank is normally subjected to slag skimming, inserting an air blowing head of the slag blowing machine into the molten iron shallow surface and blowing nitrogen into the molten iron shallow surface, pushing slag on the liquid surface to a tank opening by utilizing the raised liquid flow field for accumulation, and removing the desulfurization slag by the slag skimming machine as far as possible during slag skimming operation;
fourthly, adding into the converter.
The lime-based desulfurizer consists of the following raw materials in percentage by weight: 80-90% of coated lime, 8-12% of fluorite and 4-8% of calcium carbonate.
The magnesium-based desulfurizer consists of the following raw materials in percentage by weight: 65-81% of passivated coal powder, 10-15% of magnesium oxide and 8-12% of magnesium carbonate.
As shown in fig. 1, the blowing system includes a first powder storage tank 2 for storing a lime-based desulfurizing agent, and a second powder storage tank 3 for storing a magnesium-based desulfurizing agent, and a first powder injection tank 4 for blowing a fixed amount of the lime-based desulfurizing agent to a hot metal ladle 1 with a rotary feeder at a discharge end, and a second powder injection tank 5 for blowing a fixed amount of the magnesium-based desulfurizing agent to the hot metal ladle 1 with a rotary feeder at a discharge end, and a gas supply device for supplying nitrogen gas, connected to the first powder injection tank 4 and the second powder injection tank 5 through a pipe 6, and a spray gun 7 for spraying the lime-based desulfurizing agent and/or the magnesium-based desulfurizing agent into the hot metal ladle 1, inserted from the top of the hot metal ladle into the interior of the hot metal ladle; the spray gun 7 is connected with a pipeline for supplying powder.
The lower end of the spray gun 7 is inserted into a depth which is not more than 0.8 time of the depth of the molten iron solution in the molten iron tank 1.
The upper end of the spray gun 7 is movably arranged above the molten iron tank 1 through a supporting hanger 11; a lifting platform 12 is arranged on the support hanger 11; the lifting platform 12 is connected with the support hanger 11 through a lifting cylinder 13; the upper end of the spray gun 7 is fixedly arranged on the lower bottom surface of the lifting platform 12 through a mounting seat 14.
Example 2:
in the desulfurization pretreatment process of molten iron for casting shown in fig. 2, a rotating motor 15 is mounted on the lifting platform 13; the rotating shaft of the rotating motor 15 is connected with a mounting seat 14 of the spray gun through a transmission shaft 16; the mounting seat 14 is movably mounted on the lower bottom surface of the lifting platform 12 through a bearing seat assembly 17; the rotating motor 15 is fixed above the lifting platform 12 through the motor frame 8.
Example 3:
the process flow of the desulfurization pretreatment process for molten iron for casting is basically the same as that of the example 1, wherein the lime-based desulfurizer consists of the following raw materials in percentage by weight: 85% of coated lime, 10% of fluorite and 5% of calcium carbonate. The magnesium-based desulfurizer consists of the following raw materials in percentage by weight: 75% of passivated coal powder, 15% of magnesium oxide and 10% of magnesium carbonate. The weight ratio of the lime-based desulfurizer to the magnesium-based desulfurizer in the composite blowing in the second step is 4: 1.
according to the desulfurization pretreatment process for molten iron for casting, the lime-based desulfurizer and the magnesium-based desulfurizer are adopted for composite desulfurization, so that the desulfurization efficiency of magnesium and lime in the molten iron is improved; the magnesium powder desulfurization reaction is an exothermic reaction, so that the temperature drop of molten iron can be reduced, magnesium powder steam can generate a strong stirring effect, and resulfurization of the molten iron is prevented after the molten iron is saturated by the magnesium powder; the magnesium-based desulfurizer is used as the deep desulfurization base number, the lime-based desulfurizer is used as a carrier, the flow velocity of the magnesium-based desulfurizer can be driven, the magnesium powder of the magnesium-based desulfurizer is prevented from floating upwards, the magnesium powder can fully react in molten iron, the deep desulfurization is favorably realized, the generation of magnesium steam bubbles can be controlled through the lime powder, and the desulfurization slag and iron are prevented from being violently splashed;
calcium carbonate and magnesium carbonate are added into the lime-based desulfurizer and the magnesium-based desulfurizer, so that the utilization rate of lime can be improved; the calcium carbonate/magnesium carbonate is decomposed at high temperature to generate a large amount of carbon dioxide, bubbles of carrier gas can be broken, a desulfurizer sealed in the bubbles is released, and the stirring strength can be enhanced to promote the diffusion of sulfur; fine and porous active calcium oxide/magnesium oxide formed during the decomposition of calcium carbonate/magnesium carbonate can assist in desulfurization, so that the desulfurization efficiency is improved;
the spray gun is movably arranged above the hot metal ladle through the supporting hanger, the spray gun can be driven to move up and down through the lifting platform, so that the spray gun can move up and down in the height direction of the hot metal ladle, the spraying height of the spray gun is convenient to control, and the spraying range of the desulfurizer is enlarged;
in addition, pass through the mount pad with the spray gun and be connected with the rotating electrical machines transmission, the accessible is controlled cabinet control rotating electrical machines with the automatically controlled P L C of being connected of rotating electrical machines and is driven the spray gun and make a round trip to rotate at certain extent for the spray gun can spray the not equidirectional of same height in the molten iron jar, and the spray regime increase has changed bubble come-up route, makes the desulfurizer fully contact with the molten iron and takes place the reaction, improves desulfurization effect.
The above-described embodiments are merely preferred embodiments of the present invention, and all equivalent changes or modifications of the structures, features and principles described in the claims of the present invention are included in the scope of the present invention.
Claims (10)
1. A desulfurization pretreatment process for molten iron for casting is characterized by comprising the following steps of:
firstly, adding blast furnace molten iron into a molten iron tank, pre-slagging the molten iron in the molten iron tank by using a slagging-off machine, and measuring and sampling the temperature of the molten iron;
secondly, spraying a desulfurizing agent into the hot metal ladle by adopting a spraying and blowing method for desulfurization;
1) a blowing system is adopted to pre-blow a lime-based desulfurizer into the hot metal ladle for desulfurization;
2) a blowing system is adopted to blow lime-based desulfurizer and magnesium-based desulfurizer with a predetermined proportion into the hot metal ladle for desulfurization;
3) secondarily blowing a lime-based desulfurizer into the hot metal ladle by using a blowing system for final desulfurization;
thirdly, slagging-off, measuring the temperature and sampling, wherein a slagging-off machine is adopted to carry out slagging-off treatment on the molten iron in the molten iron tank, and the temperature and sampling are carried out on the desulfurized molten iron;
fourthly, adding into the converter.
2. The desulfurization pretreatment process of molten iron for casting according to claim 1, characterized in that: the lime-based desulfurizer consists of the following raw materials in percentage by weight: 80-90% of coated lime, 8-12% of fluorite and 4-8% of calcium carbonate.
3. The desulfurization pretreatment process of molten iron for casting according to claim 1, characterized in that: the magnesium-based desulfurizer consists of the following raw materials in percentage by weight: 65-81% of passivated coal powder, 10-15% of magnesium oxide and 8-12% of magnesium carbonate.
4. The desulfurization pretreatment process of molten iron for casting according to claim 1, characterized in that: the weight ratio of the lime-based desulfurizer to the magnesium-based desulfurizer in the composite blowing in the second step is 3: 1-4: 1.
5. The desulfurization pretreatment process of molten iron for casting according to claim 1, characterized in that: in the second step, the blowing speed of desulfurizer powder in the blowing system is 65-81 kg/min, and the flow of carrier gas is 51-72 m during flowering.
6. The desulfurization pretreatment process of molten iron for casting according to claim 1, characterized in that: in the third step of slag skimming, temperature measurement and sampling, when the desulfurization injection is finished and 70% of the molten iron tank skims slag normally, an air blowing head of the slag blowing machine is inserted into the molten iron shallow surface and nitrogen is blown in, and slag on the liquid surface is pushed to the tank opening by using the blown liquid flow field to be accumulated, so that the slag skimming machine can completely remove the desulfurization slag as much as possible during slag skimming operation.
7. The desulfurization pretreatment process of molten iron for casting according to claim 1, characterized in that: the blowing system comprises a first powder storage tank for storing lime-based desulfurizer, a second powder storage tank for storing magnesium-based desulfurizer, a first powder spraying tank for blowing quantitative lime-based desulfurizer to the hot metal ladle, a first powder spraying tank with a rotary feeder at the discharging end, a second powder spraying tank for blowing quantitative magnesium-based desulfurizer to the hot metal ladle, a gas supply device for conveying nitrogen and connected with the first powder spraying tank and the second powder spraying tank through pipelines, and a spray gun for spraying lime-based desulfurizer and/or magnesium-based desulfurizer to the hot metal ladle and inserting the lime-based desulfurizer and/or magnesium-based desulfurizer into the hot metal ladle from the top of the hot metal ladle; the spray gun is connected with a powder supply pipeline.
8. The desulfurization pretreatment process of molten iron for casting according to claim 7, characterized in that: the lower end of the spray gun is inserted into the molten iron tank to a depth not more than 0.8 time of the depth of the molten iron solution in the molten iron tank.
9. The desulfurization pretreatment process of molten iron for casting according to claim 7, characterized in that: the upper end of the spray gun is movably arranged above the hot metal ladle through a supporting hanger; a lifting platform is arranged on the supporting hanger; the lifting platform is connected with the supporting hanger through a lifting cylinder; the upper end of the spray gun is fixedly arranged on the lower bottom surface of the lifting platform through a mounting seat.
10. The desulfurization pretreatment process of molten iron for casting according to claim 9, characterized in that: a rotating motor is arranged on the lifting platform; a rotating shaft of the rotating motor is connected with a mounting seat of the spray gun through a transmission shaft; the mounting seat is movably mounted on the lower bottom surface of the lifting platform through a bearing seat assembly; the rotating motor is fixed above the lifting platform through the motor frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010460352.0A CN111471833A (en) | 2020-05-27 | 2020-05-27 | Desulfurization pretreatment process for molten iron for casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010460352.0A CN111471833A (en) | 2020-05-27 | 2020-05-27 | Desulfurization pretreatment process for molten iron for casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111471833A true CN111471833A (en) | 2020-07-31 |
Family
ID=71765309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010460352.0A Pending CN111471833A (en) | 2020-05-27 | 2020-05-27 | Desulfurization pretreatment process for molten iron for casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111471833A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101403023A (en) * | 2008-11-06 | 2009-04-08 | 山西太钢不锈钢股份有限公司 | Ultra-deep desulfuration method for hot metal |
| JP2010242148A (en) * | 2009-04-03 | 2010-10-28 | Nippon Steel Corp | Method of inhibiting slag adhesion to refining vessel refractory |
| CN103114177A (en) * | 2013-03-12 | 2013-05-22 | 武汉钢铁(集团)公司 | Gas-blowing and slag-gathering spray gun for assisting slag-off of molten iron and using method of spray gun |
| CN105256102A (en) * | 2014-07-16 | 2016-01-20 | 鞍钢股份有限公司 | Blowing and stirring combined molten iron pretreatment desulfurization device and method |
| CN106755738A (en) * | 2015-11-24 | 2017-05-31 | 上海梅山钢铁股份有限公司 | A kind of method for improving molten iron pretreatment desulfurizing pulvis deactivating magnesium powder utilization rate |
| CN106868256A (en) * | 2017-02-21 | 2017-06-20 | 江苏沙钢集团淮钢特钢股份有限公司 | HG Desulfuring Device of Hot Metal and its sulfur method and desulfurizing agent and slag-off machine |
| CN110205435A (en) * | 2019-06-04 | 2019-09-06 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A method of the molten iron pretreatment desulfurizing in converter |
-
2020
- 2020-05-27 CN CN202010460352.0A patent/CN111471833A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101403023A (en) * | 2008-11-06 | 2009-04-08 | 山西太钢不锈钢股份有限公司 | Ultra-deep desulfuration method for hot metal |
| JP2010242148A (en) * | 2009-04-03 | 2010-10-28 | Nippon Steel Corp | Method of inhibiting slag adhesion to refining vessel refractory |
| CN103114177A (en) * | 2013-03-12 | 2013-05-22 | 武汉钢铁(集团)公司 | Gas-blowing and slag-gathering spray gun for assisting slag-off of molten iron and using method of spray gun |
| CN105256102A (en) * | 2014-07-16 | 2016-01-20 | 鞍钢股份有限公司 | Blowing and stirring combined molten iron pretreatment desulfurization device and method |
| CN106755738A (en) * | 2015-11-24 | 2017-05-31 | 上海梅山钢铁股份有限公司 | A kind of method for improving molten iron pretreatment desulfurizing pulvis deactivating magnesium powder utilization rate |
| CN106868256A (en) * | 2017-02-21 | 2017-06-20 | 江苏沙钢集团淮钢特钢股份有限公司 | HG Desulfuring Device of Hot Metal and its sulfur method and desulfurizing agent and slag-off machine |
| CN110205435A (en) * | 2019-06-04 | 2019-09-06 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A method of the molten iron pretreatment desulfurizing in converter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100214927B1 (en) | Vacuum refining method of molten metal | |
| CN103924025B (en) | A kind of method of top and bottom complex blowing molten iron pre-desulfurization in hot metal ladle | |
| CN106755738A (en) | A kind of method for improving molten iron pretreatment desulfurizing pulvis deactivating magnesium powder utilization rate | |
| JP2005068506A (en) | Desulfurization method and equipment for molten iron | |
| CN213232356U (en) | Mechanical stirring-follow-up concentrated-phase blowing molten iron desulphurization device | |
| CN111471833A (en) | Desulfurization pretreatment process for molten iron for casting | |
| JP5272479B2 (en) | Method for desulfurizing and refining molten iron | |
| JP5855477B2 (en) | Hot metal refining method | |
| JP6024192B2 (en) | Method for preventing hot metal after desulphurization | |
| JP5338124B2 (en) | Method for desulfurizing and refining molten iron | |
| JP2014047376A (en) | Desulfurization method for molten pig iron | |
| JP6848437B2 (en) | Desulfurization method and desulfurization equipment for molten steel | |
| CN1298868C (en) | Refining method and refining apparatus of molten steel | |
| JP2808197B2 (en) | Vacuum refining of molten steel using large diameter immersion tube | |
| CN111206135A (en) | Molten iron desulphurization stirring device and desulphurization method thereof | |
| JPS59157209A (en) | Pretreatment of molten iron | |
| JP6790796B2 (en) | Vacuum degassing equipment | |
| JP7238570B2 (en) | Hot metal dephosphorization method | |
| CN202380012U (en) | Swing type molten iron predesulfuration lance | |
| JP3377325B2 (en) | Melting method of high cleanness ultra low carbon steel | |
| JP5272480B2 (en) | Method for desulfurizing and refining molten iron | |
| JP3290794B2 (en) | Molten steel refining method under reduced pressure | |
| JPH09241710A (en) | Method for desulfurizing molten iron in furnace hearth molten iron pool part in blast furnace | |
| JP6052436B2 (en) | Method for preventing hot metal after desulphurization | |
| CN108368559B (en) | Molten metal processing apparatus and molten metal processing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200731 |