US20070074599A1 - Method for the introduction of inorganic solid bodies into hot liquid melts - Google Patents

Method for the introduction of inorganic solid bodies into hot liquid melts Download PDF

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Publication number
US20070074599A1
US20070074599A1 US10/578,180 US57818004A US2007074599A1 US 20070074599 A1 US20070074599 A1 US 20070074599A1 US 57818004 A US57818004 A US 57818004A US 2007074599 A1 US2007074599 A1 US 2007074599A1
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US
United States
Prior art keywords
plastic
process according
mixture
inorganic solids
flux
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.)
Abandoned
Application number
US10/578,180
Inventor
Djamschid Amirzadeh-Asl
Dieter Funders
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Venator Germany GmbH
Original Assignee
Sachtleben Chemie GmbH
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 Sachtleben Chemie GmbH filed Critical Sachtleben Chemie GmbH
Assigned to SACHTLEBEN CHEMIE GMBH reassignment SACHTLEBEN CHEMIE GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AMIRZADEH-ASL, DJAMACHID, FUNDERS, DIETER
Assigned to SACHTLEBEN CHEMIE GMBH reassignment SACHTLEBEN CHEMIE GMBH RECORDED: 9/28/06 - REEL/FRAME 018331/0034 - LAST NAME OF INVENTOR DJAMSCHID MISSPELLED Assignors: AMIRZADEH-ASL, DJAMSCHID, FUNDERS, DIETER
Publication of US20070074599A1 publication Critical patent/US20070074599A1/en
Abandoned legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/02—Making special pig-iron, e.g. by applying additives, e.g. oxides of other metals
    • C21B5/023—Injection of the additives into the melting part
    • C21B5/026—Injection of the additives into the melting part of plastic material
    • 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
    • C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material

Definitions

  • the invention relates to a process for the introduction of inorganic solids into hot liquid melts.
  • Hot liquid melts are understood here as meaning metallurgical melts and/or slags found e.g. in a furnace.
  • Fluxes are used e.g. in the following metallurgical processes:
  • Addition of the fluxes by means of injection equipment which generally consists of a weighing and bunker system with a downstream gas overpressure injection system.
  • Gas overpressure systems are mechanically adapted to the particular requirements of the intended applications (e.g. high-pressure or low-pressure plant).
  • the carrier gases used can be compressed air, nitrogen or other gases, as required. If fluxes are to be injected into the furnace (e.g. blast furnace) without direct liquid contact, the solid flux can be introduced into the furnace chamber against the furnace pressure via a fixed injection lance. If solid fluxes are to be injected into the furnace (e.g.
  • the injection pressure has to be adapted to the physical proportions of the metallurgical system. Also, the injection lance must remain movable in this case in order to be able to adapt flexibly to the respective phases of the scrap smelting process.
  • a common feature of all the systems is that the physical consistency of the fluxes exerts a decisive influence on the technology of addition. Because of their intrinsic weight, coarse products fall without difficulty through the rising process gases into the smelting area. On the other hand, products of medium particle size are sucked up by the buoyancy forces of the process gases or the suction forces of the filter plants before they can develop their desired action in the liquid media. For this reason they are first packed in sacks or big bags and then introduced into the system all at once. Even if they are first packed in big bags or sacks, fine fluxes still cannot be protected from being drawn away from the liquid media by the ascending convection current or suction forces after the sacks have burnt off, and from accumulating in undesirable manner in the filter plants.
  • the object of the invention is to overcome the disadvantages of the state of the art and provide a novel process by which fine inorganic fluxes, in particular, can be introduced into metallurgical smelting systems.
  • the inorganic solids are preferably added in the form of fine particles. 90% of the inorganic solid particles have sizes particularly preferably of 0.01 ⁇ m to 5 mm and very particularly preferably of 0.1 ⁇ m to 2 mm.
  • the proportion of inorganic solids in the plastic is preferably 0.5 to 90 wt. %, particularly preferably 2 to 70 wt. % and very particularly preferably 5 to 50 wt. %, based in each case on the mixture.
  • the substances containing iron oxide, aluminium oxide, magnesium oxide, calcium oxide, silicates or slag-forming additives can be industrial residues.
  • the flux contains synthetic titanium dioxide.
  • the plastic preferably also contains the element nitrogen.
  • the plastic used is preferably old plastic.
  • the mixture of plastic and flux can be prepared in a variety of ways:
  • the mixture can preferably be introduced into the hot liquid melts by injection.
  • the plastic/flux mixture can also be used in the form of lumps.
  • shaped bodies of the particular desired dimensions can be produced from the mixture by pressing.
  • One advantage of the process according to the invention is that, by being introduced in a mixture with the plastic, the flux can be proportioned very well and introduced into the hot liquid melts in divided form. This applies especially to fluxes in the form of dust.
  • Industrial residues in the form of dust containing iron oxide, aluminium oxide, magnesium oxide, calcium oxide, silicates or slag-forming additives, can thus be utilized industrially. These residues are preferably mixed with synthetic titanium dioxide and then, as described, with the plastic.
  • the plastic not only serves as a vehicle for the flux, but can also act as a reducing agent and/or energy carrier (partially replacing heavy oil or coal).
  • the plastic contributes in the hot liquid melt to the desired formation of titanium carbides and, if the element nitrogen is present, titanium nitrides and titanium carbonitrides. These compounds improve the refractory properties of the furnace wall in e.g. furnace systems.

Abstract

A method is disclosed for the introduction of inorganic solid bodies into hot, liquid melts, whereby inorganic solid bodies are added to a plastic containing a hydrocarbon and the mixture obtained is added to the hot, liquid melt.

Description

  • The invention relates to a process for the introduction of inorganic solids into hot liquid melts.
  • Hot liquid melts are understood here as meaning metallurgical melts and/or slags found e.g. in a furnace.
  • In metallurgy, fluxes often have to be added to the hot liquid metals or slags in the various processing stages. This applies to both the iron and steel industry and non-ferrous metallurgy. Fluxes are used e.g. in the following metallurgical processes:
      • Primary metallurgy: products for liquefying the slag-forming additives during the smelting phase, and fluxes for the blast furnace industry for the purpose of prolonging the durability of the refractory lining of the blast furnace hearth.
      • Secondary metallurgy: fluxes for the top slags of melts for the purpose of adjusting the metallurgical properties of the melts to the desired values. It is possible here to use fluxes which have a direct chemical influence on the properties of both the liquid metals and the liquid slags, as well as fluxes which have a physical influence on the consistency of the particular reactants. Normally, in the case of a physical influence, a depression of the melting point of the slags is sought in order to influence the metallurgical reaction kinetics of the systems with the aim of enabling the reaction in the first place and furthermore accelerating it.
      • Tertiary metallurgy: In this final phase of the metallurgical production stages, at the last possible point immediately upstream of the pouring process, an attempt is made both chemically to adjust the properties of the end products, by adding metallurgically effective substances, and physically to influence the solidification structure of the particular metals to be poured, by adding exogenous nuclei.
  • To be able to introduce the fluxes into the hot liquid melts (metals or slags) in the respective processing stages, the following known technologies, inter alia, are used:
      • Addition of the normal, coarse fluxes from a variety of usually fully automatic weighing and bunker systems via simple gravity conveyors and hopper systems.
      • Addition of the fluxes in sack-like forms of packaging, e.g. sacks or big bags, either by hand or by means of cranes.
      • Addition of the fluxes by means of filler wires, the cavities of the filler wires (often consisting of a metallic alloying agent) containing the particular flux(es).
  • Addition of the fluxes by means of injection equipment, which generally consists of a weighing and bunker system with a downstream gas overpressure injection system. Gas overpressure systems are mechanically adapted to the particular requirements of the intended applications (e.g. high-pressure or low-pressure plant). The carrier gases used can be compressed air, nitrogen or other gases, as required. If fluxes are to be injected into the furnace (e.g. blast furnace) without direct liquid contact, the solid flux can be introduced into the furnace chamber against the furnace pressure via a fixed injection lance. If solid fluxes are to be injected into the furnace (e.g. electric furnace) in the boundary layer between liquid iron and liquid slag, for the purpose of foaming the slag, the injection pressure has to be adapted to the physical proportions of the metallurgical system. Also, the injection lance must remain movable in this case in order to be able to adapt flexibly to the respective phases of the scrap smelting process.
  • A common feature of all the systems is that the physical consistency of the fluxes exerts a decisive influence on the technology of addition. Because of their intrinsic weight, coarse products fall without difficulty through the rising process gases into the smelting area. On the other hand, products of medium particle size are sucked up by the buoyancy forces of the process gases or the suction forces of the filter plants before they can develop their desired action in the liquid media. For this reason they are first packed in sacks or big bags and then introduced into the system all at once. Even if they are first packed in big bags or sacks, fine fluxes still cannot be protected from being drawn away from the liquid media by the ascending convection current or suction forces after the sacks have burnt off, and from accumulating in undesirable manner in the filter plants.
  • The object of the invention is to overcome the disadvantages of the state of the art and provide a novel process by which fine inorganic fluxes, in particular, can be introduced into metallurgical smelting systems.
  • The object is achieved by a process for the introduction of inorganic solids (=fluxes) into hot liquid melts wherein inorganic solids are added to a hydrocarbon-containing plastic and the resulting mixture is introduced into the hot liquid melts.
  • The inorganic solids are preferably added in the form of fine particles. 90% of the inorganic solid particles have sizes particularly preferably of 0.01 μm to 5 mm and very particularly preferably of 0.1 μm to 2 mm.
  • The proportion of inorganic solids in the plastic is preferably 0.5 to 90 wt. %, particularly preferably 2 to 70 wt. % and very particularly preferably 5 to 50 wt. %, based in each case on the mixture.
  • The inorganic solids (=fluxes) used are preferably titanium-containing substances and/or substances containing iron oxide, aluminium oxide, magnesium oxide, calcium oxide, silicates or slag-forming additives, individually or as a mixture. In particular, the substances containing iron oxide, aluminium oxide, magnesium oxide, calcium oxide, silicates or slag-forming additives can be industrial residues. Very particularly preferably, the flux contains synthetic titanium dioxide.
  • Apart from hydrocarbons, the plastic preferably also contains the element nitrogen. For economic reasons the plastic used is preferably old plastic.
  • The mixture of plastic and flux can be prepared in a variety of ways:
      • The plastic is mixed in solid form (preferably as granules, matrix agglomerate or pot agglomerate) with the inorganic solids. The inorganic solids are preferably added to the plastic during the production of the plastic granules. The flux adheres to the plastic surface in the mixture obtained. This mixture is introduced into the hot liquid substances (metallurgical melts and slags).
      • The plastic is mixed in liquid (molten) form with the inorganic solids. The mixture of molten plastic and inorganic solids (=fluxes) is preferably cooled so that it solidifies. The plastic/flux mixture can then be ground or shredded.
  • When the plastic/flux mixture is in the appropriate form (e.g. as powder or granules), the mixture can preferably be introduced into the hot liquid melts by injection. The plastic/flux mixture can also be used in the form of lumps. For this purpose shaped bodies of the particular desired dimensions can be produced from the mixture by pressing.
  • One advantage of the process according to the invention is that, by being introduced in a mixture with the plastic, the flux can be proportioned very well and introduced into the hot liquid melts in divided form. This applies especially to fluxes in the form of dust. Industrial residues in the form of dust, containing iron oxide, aluminium oxide, magnesium oxide, calcium oxide, silicates or slag-forming additives, can thus be utilized industrially. These residues are preferably mixed with synthetic titanium dioxide and then, as described, with the plastic.
  • Another advantage of the process according to the invention is that the plastic not only serves as a vehicle for the flux, but can also act as a reducing agent and/or energy carrier (partially replacing heavy oil or coal). In the case where the flux contains titanium, especially synthetic titanium compounds, the plastic contributes in the hot liquid melt to the desired formation of titanium carbides and, if the element nitrogen is present, titanium nitrides and titanium carbonitrides. These compounds improve the refractory properties of the furnace wall in e.g. furnace systems.

Claims (16)

1-15. (canceled)
16. A process comprising adding inorganic solids to a hydrocarbon-containing plastic and introducing the resulting mixture into a liquid melt.
17. A process according to claim 16, wherein 90% of the inorganic solid particles have sizes of 0.01 μm to 5 mm.
18. A process according to claim 17, wherein 90% of the inorganic solid particles have sizes of 0.1 μm to 2 mm.
19. A process according to claim 16, wherein the proportion of inorganic solids in the plastic is 0.5 to 90 wt. %.
20. A process according to claim 19, wherein the proportion of inorganic solids in the plastic is 2 to 70 wt. %.
21. A process according to claim 16, wherein the inorganic solids are at least one solid selected from the group consisting of a titanium-containing substance, iron oxide, aluminum oxide, magnesium oxide, calcium oxide, a silicate, and a slag-forming additive.
22. A process according to claim 21, wherein the flux contains synthetic titanium dioxide.
23. A process according to claim 16, wherein the plastic comprises nitrogen.
24. A process according to claim 16, wherein the plastic used is old plastic.
25. A process according to claim 16, wherein the plastic is mixed in solid form with the inorganic solids.
26. A process according to claim 16, wherein the plastic is mixed in molten form with the inorganic solids.
27. A process according to claim 26, further comprising cooling the mixture until the mixture solidifies to form a solidified plastic/flux mixture.
28. A process according to claim 27, wherein the solidified plastic/flux mixture is ground or shredded.
29. A process according to claim 16, wherein the plastic/flux mixture is introduced into the hot liquid melts by injection.
30. A process according to claim 16, wherein the plastic/flux mixture is introduced into the hot liquid melts in the form of lumps.
US10/578,180 2003-11-06 2004-11-05 Method for the introduction of inorganic solid bodies into hot liquid melts Abandoned US20070074599A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE2003151686 DE10351686A1 (en) 2003-11-06 2003-11-06 Process for introducing inorganic solids into hot, liquid melts
DE10351686.7 2003-11-06
PCT/EP2004/012507 WO2005045077A1 (en) 2003-11-06 2004-11-05 Method for the introduction of inorganic solid bodies into hot liquid melts

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2004/012507 A-371-Of-International WO2005045077A1 (en) 2003-11-06 2004-11-05 Method for the introduction of inorganic solid bodies into hot liquid melts

Related Child Applications (1)

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US13/173,565 Continuation US9109267B2 (en) 2003-11-06 2011-06-30 Process for the introduction of inorganic solids into hot liquid melts

Publications (1)

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US20070074599A1 true US20070074599A1 (en) 2007-04-05

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US13/173,565 Expired - Fee Related US9109267B2 (en) 2003-11-06 2011-06-30 Process for the introduction of inorganic solids into hot liquid melts

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US (2) US20070074599A1 (en)
EP (2) EP1682685A1 (en)
CN (1) CN1906312A (en)
DE (1) DE10351686A1 (en)
WO (1) WO2005045077A1 (en)

Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3507644A (en) * 1966-04-04 1970-04-21 Miller & Co Titanium additive and method of use thereof
US3823009A (en) * 1971-02-09 1974-07-09 Bayer Ag Agglomeration of titanium ores containing iron
US3898075A (en) * 1970-01-20 1975-08-05 Freund Heinz Eberhard Stabilized liquid compositions
US4116690A (en) * 1977-01-21 1978-09-26 Lukens Steel Company Flux for use in electroslag refining process
US4197221A (en) * 1976-10-27 1980-04-08 Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler Carbon black concentrate
US4362559A (en) * 1981-03-09 1982-12-07 American Cyanamid Company Method of introducing addition agents into a metallurgical operation
US4398946A (en) * 1980-09-03 1983-08-16 Werner Kessl Giessereibedarf Gmbh Method of homogenizing cast iron melts and compacts for the carrying out thereof
US5376160A (en) * 1992-10-30 1994-12-27 Skw Trostberg Aktiengesellschaft Agent for the treatment of metal melts
US5540411A (en) * 1993-02-11 1996-07-30 Strickland Industries, Inc. Invert former for manhole base section
US5554207A (en) * 1994-11-25 1996-09-10 Usx Corporation Process of recycling iron oxides and plastics in steelmaking
US5663408A (en) * 1995-04-05 1997-09-02 Bayer Aktiengesellschaft Process for preparing diaryl carbonates
US5972072A (en) * 1997-04-07 1999-10-26 Reactive Metals & Alloys Corporation Desulfurizing mix
US6087548A (en) * 1996-02-15 2000-07-11 Levy; Alfred Method and assembly for sterilizing contaminated waste
US20010010181A1 (en) * 1997-05-30 2001-08-02 Peter Zasowski Method and system for producing steel having low nitrogen content
US6372013B1 (en) * 2000-05-12 2002-04-16 Marblehead Lime, Inc. Carrier material and desulfurization agent for desulfurizing iron
US6793708B1 (en) * 2001-10-16 2004-09-21 Jeremy A. T. Jones Slag composition

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* Cited by examiner, † Cited by third party
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CH425855A (en) * 1961-04-27 1966-12-15 Welchenberger Cristall Sandwer Process for improving the durability of the refractory lining of metallurgical furnaces or vessels
US3898076A (en) * 1972-10-19 1975-08-05 Robert L Ranke Sealing and briquetting finely divided material with vinyl copolymer and wax
US4260417A (en) * 1979-11-05 1981-04-07 Ford Motor Company Batch desulfurization in a coreless induction furnace
DE3700769A1 (en) * 1987-01-13 1988-07-21 Emil Dr Ing Elsner Process for melting metal scrap, in particular steel scrap, in an electric arc furnace
DD297772A5 (en) * 1989-02-13 1992-01-23 �����@������������������k�� METHOD OF BONDING PARTICULAR WEAPON WASTE, SUCH AS DUST, METAL WASTE, FIBERS, PAPER WASTE OD. DGL. TO SOLIDS
US5021086A (en) * 1990-07-05 1991-06-04 Reactive Metals And Alloys Corporation Iron desulfurization additive and method for introduction into hot metal
DE4419816C1 (en) * 1994-06-07 1995-06-29 Metallgesellschaft Ag Titanium-contg. additive used in refractory linings and as a slagging agent
DE4426929A1 (en) * 1994-07-29 1996-02-01 Eko Stahl Gmbh Process for recycling plastic waste and / or plastic-containing residues and iron and steel dust
TW558567B (en) * 2000-06-14 2003-10-21 Nippon Kokan Kk Method and apparatus for producing desulfurizing agent for hot-metal
DE10132843A1 (en) * 2001-07-06 2003-01-30 Wolfram Lihotzky-Vaupel Steel-making or refuse incineration-dust conversion into inert formed mass for disposal comprises combining with pre-heated binding agent in extruder for discharge in pre-determined form

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3507644A (en) * 1966-04-04 1970-04-21 Miller & Co Titanium additive and method of use thereof
US3898075A (en) * 1970-01-20 1975-08-05 Freund Heinz Eberhard Stabilized liquid compositions
US3823009A (en) * 1971-02-09 1974-07-09 Bayer Ag Agglomeration of titanium ores containing iron
US4197221A (en) * 1976-10-27 1980-04-08 Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler Carbon black concentrate
US4116690A (en) * 1977-01-21 1978-09-26 Lukens Steel Company Flux for use in electroslag refining process
US4398946A (en) * 1980-09-03 1983-08-16 Werner Kessl Giessereibedarf Gmbh Method of homogenizing cast iron melts and compacts for the carrying out thereof
US4362559A (en) * 1981-03-09 1982-12-07 American Cyanamid Company Method of introducing addition agents into a metallurgical operation
US5376160A (en) * 1992-10-30 1994-12-27 Skw Trostberg Aktiengesellschaft Agent for the treatment of metal melts
US5540411A (en) * 1993-02-11 1996-07-30 Strickland Industries, Inc. Invert former for manhole base section
US5554207A (en) * 1994-11-25 1996-09-10 Usx Corporation Process of recycling iron oxides and plastics in steelmaking
US5663408A (en) * 1995-04-05 1997-09-02 Bayer Aktiengesellschaft Process for preparing diaryl carbonates
US6087548A (en) * 1996-02-15 2000-07-11 Levy; Alfred Method and assembly for sterilizing contaminated waste
US5972072A (en) * 1997-04-07 1999-10-26 Reactive Metals & Alloys Corporation Desulfurizing mix
US20010010181A1 (en) * 1997-05-30 2001-08-02 Peter Zasowski Method and system for producing steel having low nitrogen content
US6372013B1 (en) * 2000-05-12 2002-04-16 Marblehead Lime, Inc. Carrier material and desulfurization agent for desulfurizing iron
US6793708B1 (en) * 2001-10-16 2004-09-21 Jeremy A. T. Jones Slag composition

Also Published As

Publication number Publication date
EP1944382A2 (en) 2008-07-16
US20110265607A1 (en) 2011-11-03
DE10351686A1 (en) 2005-06-09
EP1944382A3 (en) 2008-09-03
CN1906312A (en) 2007-01-31
WO2005045077A1 (en) 2005-05-19
EP1944382B1 (en) 2015-09-02
EP1682685A1 (en) 2006-07-26
US9109267B2 (en) 2015-08-18

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