WO1992007964A1 - A method of recirculating fine waste products - Google Patents

A method of recirculating fine waste products Download PDF

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Publication number
WO1992007964A1
WO1992007964A1 PCT/SE1991/000728 SE9100728W WO9207964A1 WO 1992007964 A1 WO1992007964 A1 WO 1992007964A1 SE 9100728 W SE9100728 W SE 9100728W WO 9207964 A1 WO9207964 A1 WO 9207964A1
Authority
WO
WIPO (PCT)
Prior art keywords
slag
waste products
blast furnace
crushed
added
Prior art date
Application number
PCT/SE1991/000728
Other languages
French (fr)
Inventor
Lars Erik Eriksson
Original Assignee
SSAB Tunnplåt AB
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 SSAB Tunnplåt AB filed Critical SSAB Tunnplåt AB
Publication of WO1992007964A1 publication Critical patent/WO1992007964A1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/04—Working-up slag
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B3/00—General features in the manufacture of pig-iron
    • C21B3/04—Recovery of by-products, e.g. slag
    • C21B3/06—Treatment of liquid slag
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/008—Composition or distribution of the charge
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
    • C22B7/02—Working-up flue dust
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/02—Physical or chemical treatment of slags
    • C21B2400/022—Methods of cooling or quenching molten slag
    • C21B2400/028—Methods of cooling or quenching molten slag with the permanent addition of cooled slag or other solids
    • 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
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies

Definitions

  • a METHOD OF RECIRCULATING FINE WASTE PRODUCTS This invention relates to a method of recirculating fine waste products of the iron and steel making processes.
  • dust and sludge are collected at various places. Dust as well as sludge is 5 usually collected from the cleaning of the blast furnace top gas and from the LD converter gas. There are also other filters that collect dust. The fines is also removed from the slag formers for the blast furnace since the fines cannot be allowed in the charge.
  • -0 US 4711662 A describes a way of mixing dust and sludge with liquid metallurgical slag by first making lumps of the dust and sludge and then adding the lumps to the liquid slag.
  • the resulting slag is not recirculated but it is used as a material for civil engineering works.
  • 15 DE 3906869 C describes a method of blowing zinc containing dust into a liquid slag. Nitrogen is used as a bearer gas and the evaporated zinc is recovered. A similar method is also described in JP 59153848. The resulting slag is not recirculated.
  • the various fine waste - ⁇ products are mixed with liquid slag to smelt therein.
  • the solidified slag is then crushed and a major part of the crushed slag is recycled by being added to a blast furnace charge.
  • Liquid converter slag from a LD converter was poured into a ladle and the mixture was poured against the stream of slag - ⁇ so that the stream drew the fine waste mixture into the liquid.
  • About 20 weight % mixture was added to the liquid slag.
  • the reaction was violent and the mixing was effective.
  • the carbon of the blast furnace dust and sludge had reduced the zinc oxide to metallic zinc which had evaporated as a white smoke.
  • the evaporated zinc can be collected from the exhaust fumes.
  • the fine fraction (-5 mm) must be removed before the slag can be added to the blast furnace charge. This fine fraction can be added to the fine waste mixture and recycled.
  • the invention is particulary suitable for processes in which the blast furnace is charged with pelletized ore.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

In ore based steel making, the dust and sludge from the blast furnace and converters is mixed and the mixture is added to the stream of converter slag when the slag is poured into a ladle. The stream of slag draws the mixture down into the slag. Zinc is collected from the fumes and when the resulting slag has solidified, it is crushed and a major part of it is recycled to the blast furnace.

Description

A METHOD OF RECIRCULATING FINE WASTE PRODUCTS This invention relates to a method of recirculating fine waste products of the iron and steel making processes. In ore based iron and steel making, dust and sludge are collected at various places. Dust as well as sludge is 5 usually collected from the cleaning of the blast furnace top gas and from the LD converter gas. There are also other filters that collect dust. The fines is also removed from the slag formers for the blast furnace since the fines cannot be allowed in the charge. -0 US 4711662 A describes a way of mixing dust and sludge with liquid metallurgical slag by first making lumps of the dust and sludge and then adding the lumps to the liquid slag. The resulting slag is not recirculated but it is used as a material for civil engineering works. 15 DE 3906869 C describes a method of blowing zinc containing dust into a liquid slag. Nitrogen is used as a bearer gas and the evaporated zinc is recovered. A similar method is also described in JP 59153848. The resulting slag is not recirculated. -Q It is objects of the invention to recover iron from the waste products, to reduce the amount of slag formers needed and to reduce the amount of slag and fine waste products that has to be dumped or disposed of in any other way. According to the invention, the various fine waste -~ products are mixed with liquid slag to smelt therein. The solidified slag is then crushed and a major part of the crushed slag is recycled by being added to a blast furnace charge.
A test has been carried out in which the fine waste ~ ~ products from ore-based steel making were mixed, that is both sludge and dust from the blast furnace and from the converters. The water content of the mixture was 8-9 weight %
Liquid converter slag from a LD converter was poured into a ladle and the mixture was poured against the stream of slag -~ so that the stream drew the fine waste mixture into the liquid. About 20 weight % mixture was added to the liquid slag. The reaction was violent and the mixing was effective. When the resulting slag had solidified, it was crushed. Its analysis proved that it could be added to the charge of a blast furnace. Its Fe content was about 5 % higher than the Fe content in the original slag and its zinc content was low. The carbon of the blast furnace dust and sludge had reduced the zinc oxide to metallic zinc which had evaporated as a white smoke.
In production, the evaporated zinc can be collected from the exhaust fumes. When crushing the final slag, the fine fraction (-5 mm) must be removed before the slag can be added to the blast furnace charge. This fine fraction can be added to the fine waste mixture and recycled.
The invention is particulary suitable for processes in which the blast furnace is charged with pelletized ore.

Claims

1 A method of recirculating fine waste products of the iron and steel making processes c h a r a c t e r i z e d in that said products are mixed f with liquid slag to smelt therein, the resulting slag is
5 then solidified and crushed, and at least a part of the crushed slag is added to a blast furnace charge.
2 A method according to claim 1, c h a r a c t e r i z e d in that said waste products are added to the slag adjacent the stream of slag when the slag
10 is poured into a vessel such that the stream of slag draws the waste products into the slag.
3 A method according to claim 1 or 2, c h a r a c t e r i z e d in that the waste products contain zinc, and zinc is separated from the exhaust fumes.
15 4 A method according to any one of the preceding claims, c h a r a c t e r i z e d in that said waste products is a mixture of sludge and dust.
5 A method according to any one of the preceding claims, c h a r a c t e r i z e d in that a major part of the
20 crushed resulting slag is utilized as a blast furnace charge additive.
6 A method according to any one of the preceding claims c h a r a c t e r i z e d in that said waste products contain sludge and/or dust from the blast furnace and from
25 converters.
7 A method according to any one of the preceding claims c h a r a c t e r i z e d in that the fines is removed from the crushed resulting slag and recirculated by being added to the fine waste products.
30
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PCT/SE1991/000728 1990-11-01 1991-10-30 A method of recirculating fine waste products WO1992007964A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9003494-3 1990-11-01
SE9003494A SE9003494L (en) 1990-11-01 1990-11-01 TAKE CARE OF FINE CORN REMEDY PRODUCTS

Publications (1)

Publication Number Publication Date
WO1992007964A1 true WO1992007964A1 (en) 1992-05-14

Family

ID=20380799

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1991/000728 WO1992007964A1 (en) 1990-11-01 1991-10-30 A method of recirculating fine waste products

Country Status (3)

Country Link
AU (1) AU8866891A (en)
SE (1) SE9003494L (en)
WO (1) WO1992007964A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5785737A (en) * 1997-04-08 1998-07-28 Bethlehem Steel Corporation Method for recycling iron bearing sludges in a steelmaking operation
WO1999036579A1 (en) * 1998-01-15 1999-07-22 Voest-Alpine Industrieanlagenbau Gmbh Method for producing hot metal
US6241805B1 (en) 1999-07-26 2001-06-05 Bethlehem Steel Corporation Method and system for improving the efficiency of a basic oxygen furnace
CN1067439C (en) * 1998-07-31 2001-06-20 宝山钢铁(集团)公司 Treatment method for high zinc containing iron dust

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1414491A (en) * 1920-09-07 1922-05-02 Int Precipitation Co Method for the recovery of metallic values from slag
US3365340A (en) * 1964-01-20 1968-01-23 Norman F. Tisdale Method of removing iron oxide particles from fumes
GB2047677A (en) * 1979-02-20 1980-12-03 Beremet Sa Treatment of metallurgical slags
US4711662A (en) * 1986-06-11 1987-12-08 Nippon Jiryoku Senko Co., Ltd. Process for the simultaneous treatment of dust, sludge and steel slag
DE3906869C1 (en) * 1989-03-03 1989-11-02 Klimanek Gmbh, 6680 Wiebelskirchen, De Process for producing a concentrate enrichment of metals or oxides thereof from filter dusts by expelling them from the filter dusts in their vapour form and thus collecting them in concentrated form
DE3817845A1 (en) * 1988-05-26 1989-12-07 Weg Walzwerk Euskirchen Gmbh Process for the pollution-free immobilization of dust, which contains water-soluble compounds polluting the environment, from steelworks dedusting installations

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1414491A (en) * 1920-09-07 1922-05-02 Int Precipitation Co Method for the recovery of metallic values from slag
US3365340A (en) * 1964-01-20 1968-01-23 Norman F. Tisdale Method of removing iron oxide particles from fumes
GB2047677A (en) * 1979-02-20 1980-12-03 Beremet Sa Treatment of metallurgical slags
US4711662A (en) * 1986-06-11 1987-12-08 Nippon Jiryoku Senko Co., Ltd. Process for the simultaneous treatment of dust, sludge and steel slag
DE3817845A1 (en) * 1988-05-26 1989-12-07 Weg Walzwerk Euskirchen Gmbh Process for the pollution-free immobilization of dust, which contains water-soluble compounds polluting the environment, from steelworks dedusting installations
DE3906869C1 (en) * 1989-03-03 1989-11-02 Klimanek Gmbh, 6680 Wiebelskirchen, De Process for producing a concentrate enrichment of metals or oxides thereof from filter dusts by expelling them from the filter dusts in their vapour form and thus collecting them in concentrated form

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5785737A (en) * 1997-04-08 1998-07-28 Bethlehem Steel Corporation Method for recycling iron bearing sludges in a steelmaking operation
WO1999036579A1 (en) * 1998-01-15 1999-07-22 Voest-Alpine Industrieanlagenbau Gmbh Method for producing hot metal
CN1067439C (en) * 1998-07-31 2001-06-20 宝山钢铁(集团)公司 Treatment method for high zinc containing iron dust
US6241805B1 (en) 1999-07-26 2001-06-05 Bethlehem Steel Corporation Method and system for improving the efficiency of a basic oxygen furnace

Also Published As

Publication number Publication date
AU8866891A (en) 1992-05-26
SE9003494D0 (en) 1990-11-01
SE9003494L (en) 1992-05-02

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