WO2014074002A1 - Method and system for the detection of metal inclusions in molten slag - Google Patents

Method and system for the detection of metal inclusions in molten slag Download PDF

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Publication number
WO2014074002A1
WO2014074002A1 PCT/RU2012/000903 RU2012000903W WO2014074002A1 WO 2014074002 A1 WO2014074002 A1 WO 2014074002A1 RU 2012000903 W RU2012000903 W RU 2012000903W WO 2014074002 A1 WO2014074002 A1 WO 2014074002A1
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WO
WIPO (PCT)
Prior art keywords
metal
slag
molten slag
inclusions
entrapped
Prior art date
Application number
PCT/RU2012/000903
Other languages
French (fr)
Inventor
Alexander Vladimirovich KONDRATIEV
Stepan Alexandrovich Polikhov
Mikhail Vladimirovich RYAZANOV
Sergey Sergeevich SHIBAEV
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to PCT/RU2012/000903 priority Critical patent/WO2014074002A1/en
Publication of WO2014074002A1 publication Critical patent/WO2014074002A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/20—Metals
    • G01N33/205—Metals in liquid state, e.g. molten metals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
    • G01N23/06—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption
    • G01N23/083—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption the radiation being X-rays
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
    • G01N23/06—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption
    • G01N23/12—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption the material being a flowing fluid or a flowing granular solid

Definitions

  • the present invention relates to a method and a system for the detection of metal inclusions in molten slag, with a metal fraction entrapped in non metallic molten slag material.
  • a mixture of metal/slag material is heated for example in a blast furnace and the molten metal is separated from the slag during a tapping process.
  • the mixture of molten slag and metal, particularly molten iron from the blast furnace is poured to a refractory through during tapping. While the metal/slag mixture is moving along the through molten metal like iron is being separated from the slag due to gravity.
  • the molten metal and slag streams are separated at a skimmer, where a nearly complete separation is supposed to be achieved.
  • the molten slag can contain a substantial amount of metal like iron in the form of small droplets, which are entrapped in the slag due to interfacial forces.
  • the slag is normally quenched after tapping and then disposed or utilized, for example as road filler.
  • the entrapped metal is thereby wasted.
  • the exact amount of wasted metal is unknown due to technical difficulties associated with conventional analytical measurements during the processes at high temperatures .
  • Spot tests of conventional slag suggest the wasted amount of metal to be greater than 2.5 mass percent. This are 25 kg wasted metal like iron per tonne of slag, and with the average daily amount of blast furnace slag being 3000 tonnes, that are 75 tonnes of iron wasted daily per blast furnace.
  • the metal wasted in the slag decreases the total process effectiveness and increases product costs. De ⁇ pendent on usage, metal in the slag can also lower the slag quality.
  • the object of the present invention is to provide a meth ⁇ od and a system for the detection of metal inclusions in molten slag solving the above described problems, partic ⁇ ularly to enable the detection of metal inclusions in molten slag in an easy, cost effective way and to be able to reduce metal wasted, increase slag quality and increase effectiveness of the metallurgical process due to measurement results .
  • the above object is achieved by the method according to claim 1 and the system according to claim 11.
  • the method for the detection of metal inclusions in molten slag according to the present invention comprises, that a metal fraction entrapped in non metallic molten slag material is detected using X-rays.
  • X-ray transmission can be used due to different transmission coefficients of the non metallic molten slag material as matrix material and the entrapped metal inclusions as distinguishable, detectable material.
  • the entrapped metal is distinguishable in the non metallic molten slag material by its higher X-ray adsorption and lower X-ray transmission. In X-ray images the metal gives dark parts in a bright background from the non metallic slag material.
  • the molten slag with metal inclusions can be arranged to move between an X-ray source and an X-ray detector, particularly coming from a blast furnace.
  • the X-ray source can be moveable and the X-ray detector can be synchro- nized with the source for dynamic detection. So the entrapped metal inclusions can be monitored online during the metallurgical process.
  • a CCD camera can be used as detector and/or image pro- cessing software can be used to identify the entrapped metal inclusions in the non metallic molten slag material. This gives an easy, cost effective way to detect online the entrapped metal inclusions. The size, position and/or amount of entrapped metal inclusions in the non metallic molten slag material can be determined.
  • the X-ray source and X-ray detector can be located at a through before a slag port to detect metal inclusions in the non metallic molten slag material above of a slag/metal interface.
  • the slag/metal interface described in this connection is the interface between a liquid metal stream and the slag stream above, which become separated due to gravity.
  • the method can also be used to de- tect online the slag/metal interface, the position and/or movement of the slag/metal interface.
  • the X-ray source and X-ray detector can additionally or alternatively be located behind a slag port to detect metal inclusions in the non metallic molten slag material.
  • a system for the detection of metal inclusions in molten slag according to the present invention comprises at least one X-ray source and at least one X-ray detector.
  • the at least one X-ray detector can be a high speed de- tector, particularly a high speed CCD camera.
  • the system can comprise means for an image analysis, particularly a data processing unit like a computer with image analysis software .
  • Fig. 1 illustrates a schematic view of a blast furnace 1 tapping process according to the state of the art
  • Fig. 2 illustrates a system 11 for the detection of metal inclusions in molten slag according to the present invention
  • Fig. 3 illustrates schematic an X-ray image of a metallic sphere 10 in an non metallic oxide melt 6.
  • a blast furnace 1 tapping process according to the state of the art is shown.
  • a slag/metal mixture 2 during tapping is moved through a tap hole 3 into a through 4 and due to gravity molten, hot metal and slag separate along the through 4 to a stream of metal 5 on the ground of the through 4 and a stream of slag 6 above it.
  • Slag is removed from the through 4 via a slag port 7 at the end of the through 4.
  • a skimmer 8 behind the slag port 7 stops the slag flow 6 and pushes slag out of the through 4. From there slag can be removed for further processing.
  • This slag includes metal inclusions 10 entrapped in a matrix of non metallic slag material.
  • Metal without slag from the metal stream 5 can pass by the skimmer 8 in the through 4 below the skimmer 8. It can leave the through 4 by an opening 9 at the end of the through 4 behind the skimmer 8 and it can be further pro- Completed.
  • Fig. 2 shows a method and system 11 to online monitor resp. detect metal inclusions in molten slag during the metallic process, according to the present invention.
  • This method can also be used to online monitor the position and/or movement of the inter ⁇ face between the metal stream 5 and slag stream 6. It can be used arranged in a position along the through 4 before a slag port 7 or it can be used behind the slag port 7.
  • An X-ray source 12 is positioned, as shown in fig. 2 next to one side of the through 4 and on the opposite side of the through 4 an X-ray detector 13 like a CCD camera, particularly a high speed CCD camera is positioned.
  • X-rays are irradiated from the source 12 and pass the walls of the through 4 and the slag and/or metal stream 5, 6 in between flowing in the through 4.
  • the detector 13 detects the X-rays and produces images 15 online of the stream 5 and/or 6. These images 15 can be processed and evaluated by image processing software and visualized at a screen.
  • a contrast between metal and non metallic slag material can be seen on the images 15.
  • Fig. 3 shows an example of such images 15.
  • the dark droplet 10 in the middle is a metal inclusion in a non metallic slag matrix material.
  • the produced data can be used to view and evaluate the metallic inclusions in the slag, particularly the number and size of the inclusions 10. With this data the amount of metallic material entrapped in the non metallic slag material can be evaluated.
  • the invention includes not only the above described em- bodiments, but also a combination of the embodiments and can be combined with embodiments known from the state of the art. It can be used to detect the amount of iron in slag in a metallic process, or to detect other metals like copper and so on in other metallic processes. Also combinations of metals can be detected and distinguished, assuming a difference in adsorption coefficients between components . With evaluated data from the detection the metallurgical process can be optimized by adjusting process parameters like temperature, position of skimmer 8 in the through 4 and so on. This allows to increase the process effectiveness, the amount of metal gained by the process, reduce the amount and number of metal inclusions 10 in slag and to increase the quality of the slag.

Abstract

The present invention relates to a method and a system (11) for the detection of metal inclusions in molten slag, with a metal fraction entrapped in non metallic molten slag material. The entrapped metal is detected within the molten slag using X-rays.

Description

METHOD AND SYSTEM FOR THE DETECTION OF METAL INCLUSIONS
IN MOLTEN SLAG
DESCRIPTION
The present invention relates to a method and a system for the detection of metal inclusions in molten slag, with a metal fraction entrapped in non metallic molten slag material.
In metallurgical processes like iron production a mixture of metal/slag material is heated for example in a blast furnace and the molten metal is separated from the slag during a tapping process. The mixture of molten slag and metal, particularly molten iron from the blast furnace is poured to a refractory through during tapping. While the metal/slag mixture is moving along the through molten metal like iron is being separated from the slag due to gravity. The molten metal and slag streams are separated at a skimmer, where a nearly complete separation is supposed to be achieved.
However, the molten slag can contain a substantial amount of metal like iron in the form of small droplets, which are entrapped in the slag due to interfacial forces. The slag is normally quenched after tapping and then disposed or utilized, for example as road filler. The entrapped metal is thereby wasted. The exact amount of wasted metal is unknown due to technical difficulties associated with conventional analytical measurements during the processes at high temperatures . Spot tests of conventional slag suggest the wasted amount of metal to be greater than 2.5 mass percent. This are 25 kg wasted metal like iron per tonne of slag, and with the average daily amount of blast furnace slag being 3000 tonnes, that are 75 tonnes of iron wasted daily per blast furnace. The metal wasted in the slag decreases the total process effectiveness and increases product costs. De¬ pendent on usage, metal in the slag can also lower the slag quality.
The object of the present invention is to provide a meth¬ od and a system for the detection of metal inclusions in molten slag solving the above described problems, partic¬ ularly to enable the detection of metal inclusions in molten slag in an easy, cost effective way and to be able to reduce metal wasted, increase slag quality and increase effectiveness of the metallurgical process due to measurement results . The above object is achieved by the method according to claim 1 and the system according to claim 11.
The method for the detection of metal inclusions in molten slag according to the present invention comprises, that a metal fraction entrapped in non metallic molten slag material is detected using X-rays.
With X-rays it is possible to detect metal inclusions in molten slag, in an easy and cost effective way. This can help to reduce metal wasted in slag by optimizing the metallurgical process, to increase slag quality and to increase effectiveness of the metallurgical process. X-ray transmission can be used due to different transmission coefficients of the non metallic molten slag material as matrix material and the entrapped metal inclusions as distinguishable, detectable material. The entrapped metal is distinguishable in the non metallic molten slag material by its higher X-ray adsorption and lower X-ray transmission. In X-ray images the metal gives dark parts in a bright background from the non metallic slag material.
The molten slag with metal inclusions can be arranged to move between an X-ray source and an X-ray detector, particularly coming from a blast furnace. The X-ray source can be moveable and the X-ray detector can be synchro- nized with the source for dynamic detection. So the entrapped metal inclusions can be monitored online during the metallurgical process.
A CCD camera can be used as detector and/or image pro- cessing software can be used to identify the entrapped metal inclusions in the non metallic molten slag material. This gives an easy, cost effective way to detect online the entrapped metal inclusions. The size, position and/or amount of entrapped metal inclusions in the non metallic molten slag material can be determined.
The X-ray source and X-ray detector can be located at a through before a slag port to detect metal inclusions in the non metallic molten slag material above of a slag/metal interface. The slag/metal interface described in this connection is the interface between a liquid metal stream and the slag stream above, which become separated due to gravity. The method can also be used to de- tect online the slag/metal interface, the position and/or movement of the slag/metal interface.
The X-ray source and X-ray detector can additionally or alternatively be located behind a slag port to detect metal inclusions in the non metallic molten slag material.
A system for the detection of metal inclusions in molten slag according to the present invention, particularly working with the method described above, comprises at least one X-ray source and at least one X-ray detector.
The at least one X-ray detector can be a high speed de- tector, particularly a high speed CCD camera. The system can comprise means for an image analysis, particularly a data processing unit like a computer with image analysis software . The advantages in connection with the described system for the detection of metal inclusions in molten slag according to the present invention are similar to the previously, in connection with the method for the detection of metal inclusions in molten slag described advantages.
The present invention is further described hereinafter with reference to illustrated embodiments shown in the accompanying drawings, in which: Fig. 1 illustrates a schematic view of a blast furnace 1 tapping process according to the state of the art, and Fig. 2 illustrates a system 11 for the detection of metal inclusions in molten slag according to the present invention, and Fig. 3 illustrates schematic an X-ray image of a metallic sphere 10 in an non metallic oxide melt 6.
In fig. 1 a blast furnace 1 tapping process according to the state of the art is shown. A slag/metal mixture 2 during tapping is moved through a tap hole 3 into a through 4 and due to gravity molten, hot metal and slag separate along the through 4 to a stream of metal 5 on the ground of the through 4 and a stream of slag 6 above it. Slag is removed from the through 4 via a slag port 7 at the end of the through 4. A skimmer 8 behind the slag port 7 stops the slag flow 6 and pushes slag out of the through 4. From there slag can be removed for further processing. This slag includes metal inclusions 10 entrapped in a matrix of non metallic slag material.
Metal without slag from the metal stream 5 can pass by the skimmer 8 in the through 4 below the skimmer 8. It can leave the through 4 by an opening 9 at the end of the through 4 behind the skimmer 8 and it can be further pro- cessed.
To optimize the whole metallic process it is important to online monitor the content of metallic inclusions in the slag and the interface between the metal stream 5 and slag stream 6 in the through 4. Fig. 2 shows a method and system 11 to online monitor resp. detect metal inclusions in molten slag during the metallic process, according to the present invention. This method can also be used to online monitor the position and/or movement of the inter¬ face between the metal stream 5 and slag stream 6. It can be used arranged in a position along the through 4 before a slag port 7 or it can be used behind the slag port 7.
An X-ray source 12 is positioned, as shown in fig. 2 next to one side of the through 4 and on the opposite side of the through 4 an X-ray detector 13 like a CCD camera, particularly a high speed CCD camera is positioned. X- rays are irradiated from the source 12 and pass the walls of the through 4 and the slag and/or metal stream 5, 6 in between flowing in the through 4. At the other side of the through 4 the detector 13 detects the X-rays and produces images 15 online of the stream 5 and/or 6. These images 15 can be processed and evaluated by image processing software and visualized at a screen. Due to different transmission coefficients of metal and non metallic slag material for X-rays, a contrast between metal and non metallic slag material can be seen on the images 15. Fig. 3 shows an example of such images 15. The dark droplet 10 in the middle is a metal inclusion in a non metallic slag matrix material. The produced data can be used to view and evaluate the metallic inclusions in the slag, particularly the number and size of the inclusions 10. With this data the amount of metallic material entrapped in the non metallic slag material can be evaluated.
The use of two detectors 13, what is not shown in the fig. for simplicity, allows the production of 3D images. This enables a determination of location and size of metallic inclusions in the non metallic slag material in three dimensions, and allows even better to determine the correct amount of metallic inclusions in non metallic slag material.
The invention includes not only the above described em- bodiments, but also a combination of the embodiments and can be combined with embodiments known from the state of the art. It can be used to detect the amount of iron in slag in a metallic process, or to detect other metals like copper and so on in other metallic processes. Also combinations of metals can be detected and distinguished, assuming a difference in adsorption coefficients between components . With evaluated data from the detection the metallurgical process can be optimized by adjusting process parameters like temperature, position of skimmer 8 in the through 4 and so on. This allows to increase the process effectiveness, the amount of metal gained by the process, reduce the amount and number of metal inclusions 10 in slag and to increase the quality of the slag.
List of Reference Characters
1 furnace
2 slag/metal mixture
3 tape hole
4 through
5 metal stream
6 slag stream
7 slag port
8 skimmer
9 metal output
10 metal inclusion droplet
11 system for the detection of metal inclusions
in molten slag according to invention
12 X-ray source
13 X-ray detector, particularly a high speed CCD camera
14 computer
15 X-ray image

Claims

1. Method for the detection of metal inclusions in molten slag, with a metal fraction entrapped in non metallic molten slag material,
characterized in that the entrapped metal is detected within the molten slag using X-rays.
2. Method according to claim 1, wherein X-ray transmis- sion is used, with different transmission coefficients of the non metallic molten slag material as matrix material and the entrapped metal inclusions as distinguishable, detected material .
3. Method according to claim 1 or 2, wherein the molten slag with metal inclusions is arranged to move between an X-ray source (12) and an X-ray detector (13) , particularly during or after processing in a blast furnace (1) .
4. Method according to claim 3, wherein the X-ray source (12) is moveable and the X-ray detector (13) is synchronized with the source (12) for dynamic detection.
5. Method according to claim 3 or 4 , wherein a CCD camera is used as detector (13) and/or an image processing software is used to identify the entrapped metal inclusions in the non metallic molten slag material.
6. Method according to one of the claims 3 to 5, wherein the size, position and/or amount of entrapped metal inclusions in the non metallic molten slag material is cle- termined.
7. Method according to one of the claims 3 to 6, wherein the X-ray source (12) and X-ray detector (12) are located at a through before a slag port (7) to detect metal in¬ clusions in the non metallic molten slag material above of a slag/metal interface (5, 6) .
8. Method according to one of the claims 3 to 6 , wherein the X-ray source (12) and X-ray detector (13) are located behind a slag port (7) to detect metal inclusions in the non metallic molten slag material (6) .
9. Method according to one of the claims 1 to 7, wherein the method is used to detect a slag/metal interface (5, 6) , the position and/or movement of the slag/metal inter- face (5, 6) , particularly for online monitoring.
10. Method according to one of the claims 1 to 9, wherein two detectors (13) are used to produce a 3D image.
11. System (11) for the detection of metal inclusions in molten slag working with the method according to one of the claims 1 to 10, comprising at least one X-ray source (12) and at least one X-ray detector (13) .
12. System (11) according to claim 11, wherein the at least one X-ray detector (13) is a high speed detector, particularly a high speed CCD camera.
13. System (11) according to one of the claims 11 or 12, comprising means for an image analysis (14), particularly a data processing unit with image analysis software.
PCT/RU2012/000903 2012-11-06 2012-11-06 Method and system for the detection of metal inclusions in molten slag WO2014074002A1 (en)

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PCT/RU2012/000903 WO2014074002A1 (en) 2012-11-06 2012-11-06 Method and system for the detection of metal inclusions in molten slag

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017109298A1 (en) * 2015-12-23 2017-06-29 Outotec (Finland) Oy A method and an arrangement for monitoring of a metallurgical froth flotation process in a metallurgical flotation cell
WO2017109297A1 (en) * 2015-12-23 2017-06-29 Outotec (Finland) Oy A method and an arrangement for monitoring of a metallurgical separation process
WO2017109296A1 (en) 2015-12-23 2017-06-29 Outotec (Finland) Oy A method and an arrangement for monitoring of a metallurgical process in a metallurgical process vessel
WO2017109294A1 (en) * 2015-12-23 2017-06-29 Outotec (Finland) Oy A method and an arrangement for monitoring of a hydrometallurgical liquid-liquid extraction process

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US4850001A (en) * 1987-07-20 1989-07-18 Shell Oil Company Orifice blockage detection system
US5627910A (en) * 1993-06-30 1997-05-06 Compagnie Europeenne Du Zirconium Cezus Process for inspecting metallic chips fragments in order to eliminate more X-ray absorbent inclusions from them
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017109298A1 (en) * 2015-12-23 2017-06-29 Outotec (Finland) Oy A method and an arrangement for monitoring of a metallurgical froth flotation process in a metallurgical flotation cell
WO2017109297A1 (en) * 2015-12-23 2017-06-29 Outotec (Finland) Oy A method and an arrangement for monitoring of a metallurgical separation process
WO2017109296A1 (en) 2015-12-23 2017-06-29 Outotec (Finland) Oy A method and an arrangement for monitoring of a metallurgical process in a metallurgical process vessel
WO2017109294A1 (en) * 2015-12-23 2017-06-29 Outotec (Finland) Oy A method and an arrangement for monitoring of a hydrometallurgical liquid-liquid extraction process

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