CN1210412C - Desulphurizing molten iron - Google Patents

Desulphurizing molten iron Download PDF

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Publication number
CN1210412C
CN1210412C CNB018200222A CN01820022A CN1210412C CN 1210412 C CN1210412 C CN 1210412C CN B018200222 A CNB018200222 A CN B018200222A CN 01820022 A CN01820022 A CN 01820022A CN 1210412 C CN1210412 C CN 1210412C
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CN
China
Prior art keywords
molten
container
molten bath
pig
iron
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Expired - Fee Related
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CNB018200222A
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Chinese (zh)
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CN1478150A (en
Inventor
安德鲁·C·伯罗
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Technological Resources Pty Ltd
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Technological Resources Pty Ltd
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Publication of CN1478150A publication Critical patent/CN1478150A/en
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Publication of CN1210412C publication Critical patent/CN1210412C/en
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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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • 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
    • 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
    • F27D3/14—Charging or discharging liquid or molten material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
    • F27M2003/00—Type of treatment of the charge
    • F27M2003/16—Treatment involving a chemical reaction

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  • 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

A process and an apparatus for desulphurizing molten iron is disclosed. The process includes forming a pool of molten iron in a vessel (3) and discharging creating a downward flow of molten iron in the vessel by supplying molten iron to be desulphurized into an upper region of the vessel and desulphurized molten iron from a lower region of the vessel. The process also includes supplying at least part of the desulphurizing agents for the process into a lower region of the molten pool whereby there is a general upward flow of desulphurizing agents and sulphur-containing slag countercurrent to the downward flow of molten iron.

Description

Desulphurizing molten iron
Technical field
The present invention relates to a kind of method and apparatus that is used for the desulfurization of continuous fusion iron.
Although never be special, the invention particularly relates to a kind of method and apparatus that is used for the desulfurization of continuous fusion iron, this molten pig supplies in pig iron liquid filling machine or the steelmaking container subsequently.
Summary of the invention
The invention provides a kind of method of desulphurizing molten iron, this method comprises the steps: solid-state sweetening agent is supplied in the molten bath, a pond that comprises in the container, and in the molten bath desulphurizing molten iron, and on the upper surface of molten bath, form the sulfur-bearing slag; Continuously molten pig to be desulfurization is supplied in the upper area in molten bath, and discharge continuously iron from the molten bath lower region through desulfurization via chute, this chute has the inlet end that is communicated with the lower region in molten bath, and extend upward and end at exit end, cause molten pig to flow downward thus from the upper area in molten bath, and this method feature is following steps: be about at least a portion sweetening agent by supplying in the molten bath in the lower region that sweetening agent and carrier gases is ejected into the molten bath via jet pipe, this jet pipe has the exit end in the lower region of molten bath, and solid-state thus sweetening agent and flowing downward of molten pig move up upstream gradually.
Preferably, comprise that the upper end that molten pig is transported to the opening of container by gravity supplies to molten pig to be desulfurization in the molten bath.
Preferably, comprise from the upper surface of molten bath and remove slag continuously or periodically.
Preferably, comprise by smoothing out with the fingers and scrape slag and remove slag from the molten bath upper surface.
Preferably, molten pig to be desulfurization has on the weight at least 0.08% sulphur content.
Preferably, has on the weight of being no more than 0.05% sulphur content through the molten pig of desulfurization.
Preferably, the temperature of molten pig to be desulfurization is at least 1300 ℃.
The invention provides a kind of method of making molten pig, it comprises the steps:
I. melting iron-bearing materials and produce molten pig; And
Ii. with method desulphurizing molten iron as described above.
Preferably, the fusing step I comprises with based on direct fusion iron-bearing materials in the direct melting method in molten bath.
Preferably, the direct fusion method based on the molten bath comprises the continuous molten pig of discharging from direct melting container.
The invention provides a kind of equipment that is used for desulphurizing molten iron, it comprises:
I. be used to hold the container of a pond molten pig, this container has bottom and sidewall;
Ii. be used for molten pig to be desulfurization is supplied to device in the upper area of molten bath continuously;
Iii. chute, it has the inlet end that is communicated with the lower region in molten bath, and extends upward and end at exit end, is used for continuously discharging molten pig through desulfurization from the lower region in molten bath, in use causes the molten pig in the container to flow downward thus; And
Iv. jet pipe, it extends downwardly in the container, and has exit end in the lower region in molten bath, is used for solid-state sweetening agent and carrier gases are ejected in the lower region in molten bath, thus in use, flowing downward of sweetening agent and molten pig moves up upstream gradually.
Preferably, this container is narrow relatively erected container.
Preferably, this container is columniform.
Preferably, this container comprises and is used for removing the scoriaceous device of sulfur-bearing continuously or periodically from the molten bath upper surface.
The invention provides a kind of equipment that is used to produce molten pig, it comprises:
I. be used for direct melting iron-bearing materials and produce the direct melting container of molten pig; And
Ii. above-mentioned each described sweetener is used for the desulphurizing molten iron that direct melting container is discharged.
Preferably, directly melting container is suitable for holding iron and scoriaceous molten bath, and comprises the device that is used for discharging continuously molten pig.
According to the present invention, a kind of method of desulphurizing molten iron is provided, this method comprises the steps: solid-state sweetening agent is supplied in the molten bath, a pond that comprises in the container, and in the molten bath desulphurizing molten iron, on the upper surface of molten bath, form the sulfur-bearing slag; Continuously molten pig to be desulfurization is supplied in the upper area in molten bath; And from the continuous iron of discharging of molten bath lower region through desulfurization, cause molten pig to flow downward thus, and this method also comprises the steps: at least a portion sweetening agent soon by supplying in the molten bath in the lower region that sweetening agent and carrier gases is ejected into the molten bath, and solid-state thus sweetening agent and flowing downward of molten pig move up upstream gradually.
Move up and the moving down of molten pig of above-mentioned sweetening agent have been impelled mixing fully, and this causes the high-efficiency desulfurization of molten pig.
Term " adverse current " should be understood to and is meant: compare with flowing downward of molten pig, exist the basic of sweetening agent and sulfur-bearing slag (owing to the reaction between molten pig and the sweetening agent produces) upwards to flow.
Preferably, this method comprises molten pig to be desulfurization gravity by transporting molten iron is supplied in the molten bath.
Preferably, this method comprises molten pig to be desulfurization is supplied to the upper end that molten pig is transported to the opening of container in the molten bath by gravity.
Preferably, this method comprises from the lower region of container and discharges molten pig through desulfurization.
Preferably, this method comprises from the upper surface of molten bath and removes slag continuously or periodically.
Preferably, this method comprises by smoothing out with the fingers from the molten bath upper surface and scrapes slag and remove slag.
Preferably, molten pig to be desulfurization has on the weight at least 0.08% sulphur content.
Preferably, has on the weight of being no more than 0.05% sulphur content through the molten pig of desulfurization.
Preferably, has on the weight of being no more than 0.04% sulphur content through the molten pig of desulfurization.
Preferably, the temperature of molten pig to be desulfurization is at least 1300 ℃.
Preferably, carrier gases is rare gas element.
According to the present invention, a kind of method of making molten pig also is provided, it comprises:
I. melt iron-bearing materials and produce molten pig; And
Ii. with the aforesaid method desulphurizing molten iron.
Preferably, the fusing step I comprises with based on direct fusion iron-bearing materials in the direct melting method of molten bath (molten bath).
Preferably, the direct fusion method based on the molten bath comprises the continuous molten pig of discharging from direct melting container.
According to the present invention, a kind of equipment that is used for desulphurizing molten iron also is provided, it comprises:
I. be used to hold the container of a pond molten pig, this container has bottom and sidewall;
Ii. be used for molten pig to be desulfurization is supplied to device in the upper area of molten bath continuously;
Iii. be used for coining into molten pig thus and flowing downward from the continuous device of discharging of the lower region in molten bath through the molten pig of desulfurization; And
Iv. be used for solid-state sweetening agent and carrier gases are ejected into device in the lower region of molten bath, in use flowing downward of sweetening agent and molten pig upwards flowed upstream gradually thus.
Preferably, this container is narrow relatively erected container.
Term " narrow " is interpreted as referring to the molten bath that this container is suitable for comprising the molten pig of depth-width ratio at least 2: 1 at this.
Preferably, this container is columniform, and has the least depth of 2m at least and the minimum width of 1m at least.
Preferably, this container comprises and is used for removing the scoriaceous device of sulfur-bearing continuously or periodically from the molten bath upper surface.
Preferably, be used for comprising chute through the device of the molten pig of desulfurization that this chute has inlet end in the lower region of container, and extends upward, and ends at exit end from the continuous discharge of molten bath lower region.
Preferably, this container comprises an opening end.
According to the present invention, a kind of equipment that is used to produce molten pig also is provided, it comprises:
I. be used for direct melting iron-bearing materials and produce the direct melting container of molten pig; And
Ii. aforesaid sweetener is used for the desulphurizing molten iron that direct melting container is discharged.
Preferably, directly melting container is suitable for holding iron and scoriaceous molten bath, and comprises the device that is used for discharging continuously molten pig, as forehearth.
Description of drawings
To further describe the present invention by means of example with reference to accompanying drawing.
Fig. 1 is the synoptic diagram of the preferred embodiment of the method according to this invention and device.
Embodiment
The preferred embodiment of method and apparatus of the present invention as shown in the figure is with desulphurizing molten iron.
Molten pig to be desulfurization can be by any suitable direct melting method production.A kind of so suitable direct melting method is the Hismelt method, as described by example among the International Application PCT/AU/000881 with applicant's name.The patent specification of this international application is incorporated herein by reference.
This equipment comprises the container that is always indicated by Reference numeral 3, is used to hold a pond molten pig 19.
Container 3 is to be roughly cylindrical, narrower erected container, and comprises the upper end 9 of bottom 5, sidewall 7 and opening, and the upper end 9 of opening defines an inlet for the treatment of desulphurizing molten iron.
Container 3 also comprises a chute 11, and it extends upward and end at exit end 13 to become the angle about 60 ° with level from the lower region of container, and defines the outlet through the molten pig of desulfurization.
Container 3 also comprises the liner of external metallization housing and refractory materials.
This equipment also comprises injection system, is used for solid-state sweetening agent is ejected into the lower region in molten pig molten bath contained in the container.Injection system comprises jet pipe 15, and jet pipe 15 extends downwardly in the container, thereby the exit end of jet pipe 17 is in the lower region of container.
As shown in the figure, in use, container comprises a pond molten pig 19.
The preferred embodiment of the method according to this invention, molten pig to be desulfurization supplies in the upper area in molten bath 19, and through the molten pig of desulfurization from the molten bath 19 lower region discharge continuously, in container, have flowing downward continuously of molten pig thus.
Specifically, molten pig to be desulfurization supplies in the molten bath 19 continuously via the upper, open end 9 of the container 3 forehearth (not shown) from direct melting container (not shown).
Molten pig through desulfurization is discharged through exit end 13 continuously from the lower region of container.
The supply of molten pig and discharge have produced molten pig flowing downward continuously by container.Molten pig is downward through container continuously along with it and is desulfurized the agent desulfurization, and this sweetening agent sprays in the lower region of container via spraying jet pipe 15 with the delivery air.
The sweetening agent that is sprayed upwards towards the molten bath 19 surface float, with the adverse current that flows downward of molten pig.The counter current contact of molten pig and sweetening agent has promoted to mix fully, and this causes molten pig by desulfurization efficiently.
The result of desulfurization forms the sulfur-bearing slag on the upper surface of molten bath, and this slag is by periodically or smooth out with the fingers from upper surface continuously and wipe off.
Said vesse 3 generally has following size, and according to following parameter work.
Inside diameter of vessel: 1.5m
Pool depth: 3m
Jet pipe internal diameter: 0.15m
The residence time of molten pig in container: 22 minutes
The residence time of molten pig in chute: 0.3 minute
The quality of molten pig in container: 37 tons
Project Minimum The typical case Maximum
Pig iron flow velocity (t/h) 80 102～104 128
℃ (in SRV) ＞1350 ～1420～1450 1450
℃ (to be desulfurization) 1320 ～1350～1400 1420
％S 0.08 0.11～0.15 0.2
&C 3.5 3.7～4.3 4.5
％P 0.040 0.048～0.058 0.070
％Si ～0 ～0 ＜＜0.1
％Mn 0.001 0.002～0.003 0.005
%S after the desulfurization 0.03 0.0035 ＜0.05
Said vesse size and working parameter only provide as example, and the present invention is not limited in these parameters and the working parameter.
Not deviating under marrow of the present invention and the scope prerequisite, can make multiple improvement to the preferred embodiment of method and apparatus of the present invention.

Claims (16)

1. the method for a desulphurizing molten iron, this method comprises the steps: solid-state sweetening agent is supplied in the molten bath, a pond that comprises in the container, and in the molten bath desulphurizing molten iron, and on the upper surface of molten bath, form the sulfur-bearing slag; Continuously molten pig to be desulfurization is supplied in the upper area in molten bath, and discharge continuously iron from the molten bath lower region through desulfurization via chute, this chute has the inlet end that is communicated with the lower region in molten bath, and extend upward and end at exit end, cause molten pig to flow downward thus from the upper area in molten bath, and this method feature is following steps: be about at least a portion sweetening agent by supplying in the molten bath in the lower region that sweetening agent and carrier gases is ejected into the molten bath via jet pipe, this jet pipe has the exit end in the lower region of molten bath, and solid-state thus sweetening agent and flowing downward of molten pig move up upstream gradually.
2. comprise the method for claim 1, wherein that the upper end that molten pig is transported to the opening of container by gravity supplies to molten pig to be desulfurization in the molten bath.
3. method as claimed in claim 1 or 2 wherein, comprises from the upper surface of molten bath and removes slag continuously or periodically.
4. method as claimed in claim 1 or 2 wherein, comprises by smoothing out with the fingers from the molten bath upper surface and scrapes slag and remove slag.
5. method as claimed in claim 1 or 2, wherein, molten pig to be desulfurization has on the weight at least 0.08% sulphur content.
6. method as claimed in claim 1 or 2 wherein, has on the weight of being no more than 0.05% sulphur content through the molten pig of desulfurization.
7. method as claimed in claim 1 or 2, wherein, the temperature of molten pig to be desulfurization is at least 1300 ℃.
8. method of making molten pig, it comprises the steps:
I. melting iron-bearing materials and produce molten pig; And
Ii. with the method according to any one of the preceding claims desulphurizing molten iron.
9. method as claimed in claim 8, wherein, the fusing step I comprises with based on direct fusion iron-bearing materials in the direct melting method in molten bath.
10. method as claimed in claim 9 wherein, comprises based on the direct fusion method in molten bath and discharge molten pig continuously from direct melting container.
11. an equipment that is used for desulphurizing molten iron, it comprises:
I. be used to hold the container of a pond molten pig, this container has bottom and sidewall;
Ii. be used for molten pig to be desulfurization is supplied to device in the upper area of molten bath continuously;
Iii. chute, it has the inlet end that is communicated with the lower region in molten bath, and extends upward and end at exit end, is used for continuously discharging molten pig through desulfurization from the lower region in molten bath, in use causes the molten pig in the container to flow downward thus; And
Iv. jet pipe, it extends downwardly in the container, and has exit end in the lower region in molten bath, is used for solid-state sweetening agent and carrier gases are ejected in the lower region in molten bath, thus in use, flowing downward of sweetening agent and molten pig moves up upstream gradually.
12. equipment as claimed in claim 11, wherein, this container is narrow relatively erected container.
13. equipment as claimed in claim 12, wherein, this container is columniform.
14. as each described equipment in the claim 11 to 13, wherein, this container comprises and is used for removing the scoriaceous device of sulfur-bearing continuously or periodically from the molten bath upper surface.
15. an equipment that is used to produce molten pig, it comprises:
I. be used for direct melting iron-bearing materials and produce the direct melting container of molten pig; And
Ii. as each described sweetener in the claim 11 to 14, be used for the desulphurizing molten iron that direct melting container is discharged.
16. equipment as claimed in claim 15, wherein, directly melting container is suitable for holding iron and scoriaceous molten bath, and comprises the device that is used for discharging continuously molten pig.
CNB018200222A 2000-12-12 2001-12-12 Desulphurizing molten iron Expired - Fee Related CN1210412C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPR2032A AUPR203200A0 (en) 2000-12-12 2000-12-12 Desulphurizing molten iron
AUPR2032 2000-12-12

Publications (2)

Publication Number Publication Date
CN1478150A CN1478150A (en) 2004-02-25
CN1210412C true CN1210412C (en) 2005-07-13

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CNB018200222A Expired - Fee Related CN1210412C (en) 2000-12-12 2001-12-12 Desulphurizing molten iron

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CN (1) CN1210412C (en)
AU (2) AUPR203200A0 (en)
WO (1) WO2002048408A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
OA13251A (en) * 2005-04-18 2007-01-31 Tech Resources Pty Ltd Production of Iron.
EP3976837B1 (en) * 2019-05-24 2024-01-17 Tata Steel Nederland Technology B.V. Device and method for continuous desulphurisation of liquid hot metal
CN112484504A (en) * 2020-11-09 2021-03-12 赵磊 Countercurrent gas suspension smelting method and countercurrent gas suspension smelting furnace

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU678071A1 (en) * 1972-11-27 1979-08-05 Донецкий Ордена Трудового Красного Знамени Политехнический Институт Arrangement for treating iron with magnesia
JPS57181313A (en) * 1981-04-30 1982-11-08 Shinko Electric Co Ltd Desulfurizing device
JPS5873711A (en) * 1981-10-27 1983-05-04 Shinko Electric Co Ltd Desulfurizing device for molten cast iron
US4512801A (en) * 1982-12-21 1985-04-23 Shinko Electric Co. Ltd. Apparatus for and method of desulfurizing and heating molten metal

Also Published As

Publication number Publication date
WO2002048408A1 (en) 2002-06-20
CN1478150A (en) 2004-02-25
AUPR203200A0 (en) 2001-01-11
AU2002221331A1 (en) 2002-06-24

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Granted publication date: 20050713

Termination date: 20131212