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WO1994014987A1 - Traitement de minerais - Google Patents

Traitement de minerais Download PDF

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Publication number
WO1994014987A1
WO1994014987A1 PCT/AU1993/000671 AU9300671W WO9414987A1 WO 1994014987 A1 WO1994014987 A1 WO 1994014987A1 AU 9300671 W AU9300671 W AU 9300671W WO 9414987 A1 WO9414987 A1 WO 9414987A1
Authority
WO
WIPO (PCT)
Prior art keywords
ores
sinter
sintering
particles
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.)
Ceased
Application number
PCT/AU1993/000671
Other languages
English (en)
Inventor
Chin Eng Loo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BHP Iron Ore Pty Ltd
Original Assignee
BHP Iron Ore Pty Ltd
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 BHP Iron Ore Pty Ltd filed Critical BHP Iron Ore Pty Ltd
Publication of WO1994014987A1 publication Critical patent/WO1994014987A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16—Sintering; Agglomerating

Definitions

  • the present invention relates to sintering an iron ore blend, and in particular an iron ore blend containing porous reactive ores, such as pisolite ore.
  • intering as used herein in relation to an iron ore blend describes a process whereby a green mix of iron ore particles, fluxes (e.g. limestone, dolomite, and serpentine), fuel, and plant fines (eg. mill scale, blast-furnace dust, and returned sinter fines) are converted into an agglomerate called "sinter" .
  • the process comprises the following basic steps:
  • hematite ores hematite ores
  • the hematite ores are formed from banded iron formations - ferruginous sedimentary rocks that consist of fine, alternating layers of magnetite and quartz - by natural enrichment during geological time.
  • the enrichment process involves the removal of silica and addition of iron to produce large hematite ore bodies, many of which have a very high iron grade.
  • the fluxes used in sintering blends of hard/dense hematite ores typically comprise limestone, dolomite and serpentine, and in accordance with the usual practice, for optimum sinter plant productivity, the particle size distribution of the fluxes is selected to be minus 3 mm with a considerable proportion of the particles being minus 1 mm material.
  • the Pilbara region of Western Australia has considerable reserves of porous reactive iron ores, which are softer and more porous than hematite ores, and increasingly the porous reactive iron ores are being included in iron ore blends with the hard/dense hematite iron ores.
  • the porous reactive ores include (a) pisolite ore, such as Yandi ore, which is composed predominantly of goethite (FeO.OH) with only minor amounts of hematite; (b) porous hematite ores, such as Cara as ore; and (c) hematite- goethite ores such as Marra Mamba ore.
  • sinter formed from blends of soft/porous ores and hematite ores has the advantages of improved reducibility and,low-temperature reduction degradation index compared with sinter formed from blends of hematite ores only.
  • the improved reducibility is thought to be due to the soft/porous ores forming an extremely open structure composed of fine hematite grains during sintering.
  • Japanese patent 58-55221 entitled “Method of Pre-processing Sinter Raw Materials” in the name of Nippon Steel Corporation and Nisshin Steel Technical Report 1988, December, No. 59, 68-75 entitled “Increase of Sinter Productivity by Pre-granulation Process” proposes coating the surface of particles of pisolite ores with serpentine prior to granulation with hematite ores and other components to form a green mix.
  • the purpose of the serpentine coating is to alter the assimilation behaviour of the pisolite ore particles during sintering and thereby improve sinter plant productivity.
  • Japanese patent 58-141341 entitled "Preliminary Treating of Ore containing Limonite for Sintering" in the name of Nippon Steel Corp. proposes coating the surface of particles of pisolite ores with fine ores (greater than 80% of the fine ore particles less than 0.25 mm) prior to granulation with other components to form a green mix.
  • the purpose of the fine ore coating on the pisolite ore particles is to alter the assimilation behaviour of the pisolite ore particles during sintering and thereby improve sinter plant productivity.
  • An object of the present invention is to provide an alternative process of sintering iron ore blends containing soft/porous ores to achieve higher sinter plant productivity to a productivity level up to or better than that obtained using known processes of sintering iron ore blends containing predominantly hematite ores.
  • the flux be selected from the group comprising limestone, dolomite and serpentine. It is preferred that at least 60% of the flux particles be greater than 1 mm in diameter.
  • At least 70% of the flux particles be greater than 1 mm in diameter.
  • At least 80% of the flux particles be greater than 1 mm in diameter.
  • At least 50% of the limestone and dolomite flux particles be greater than 2 mm in diameter.
  • At least 50% of the limestone and dolomite flux particles be greater than 3 mm in diameter.
  • the iron ore blend comprises more than 10 wt. % soft/porous ores.
  • the soft/porous ores comprise pisolite ore.
  • the present invention is based on the realisation that the sintering behaviour of soft/porous ores such as pisolite ore can be altered advantageously to cause an improvement in sinter plant productivity by using coarser flux size distributions, compared to that currently being used for sintering hematite ores.
  • the sinter tests were carried out using a pilot- plant sinter pot sintering facility at the Newcastle Laboratories of the applicant.
  • the sinter pot used had an area of 0.09 m 2 and was operated with a material bed height of 500 mm.
  • the total granulated mix charge weight for each sinter test was approximately 70 kgs.
  • the sintering facility and operating parameters are described in detail in a paper entitled "Positioning coke particles in iron ore sintering" by C.S. Teo, R. Mikka and CE. Loo published in ISIJ Int. 32, 10, 1992, 1047-1057, and the disclosure in the paper is incorporated herein.
  • the aim of the sinter tests was to obtain a return fines balance of between 0.95 and 1.05.
  • a sinter mix of around 100 kg of iron ore and fluxes was granulated in a batch granulation drum of 1.1 m in diameter. Water was sprayed onto the sinter mix as sprays as the sinter mix cascaded in the drum. After 10 minutes of granulation, the drum was tilted and the charge emptied directly into a hopper.
  • the standard method for loading the sinter pot involved placing the hopper directly above the sinter pot and opening the sliding valve at the bottom of the hopper to discharge its contents.
  • the base iron ore blend contained ores that were selected on the basis of chemical composition and in suitable proportions to achieve a target sinter chemical composition of: 55.7% Fe; 5.29% Si0 2 ; 1.88% Al 2 0 3 ; 9.53% CaO; and 1.6% MgO.
  • the base iron ore blend was predominantly hard/dense hematite with approximately 10 wt. % soft/porous ore (Robe River ore) .
  • the fluxes comprised limestone, dolomite and serpentine.
  • the chemical analysis of the "as-received" fluxes is shown in Table 2 .
  • the sinter mix was prepared by thoroughly mixing together the iron ore blend and fluxes.
  • the addition of limestone was controlled to obtain a sinter lime-to-silica ratio of 1.8 and the addition of serpentine and dolomite, in a ratio of 3:1, was controlled to obtain the 1.6 MgO% component of the target sinter chemical composition.
  • references in the preceding discussions and the table to "as-received” fluxes refer to fluxes having the chemical analysis detailed in Table 2. Such “as-received” fluxes are typical of the fluxes used to sinter hematite ores, and therefore have only a relatively small proportion of the particles being minus 1 mm.
  • the references in the table to "plus 1 mm limestone”, “plus 2 mm limestone”, “plus 1 mm serpentine”, “plus 1 mm limestone and plus 1 mm serpentine”, and “plus 2 mm limestone and plus 1 mm serpentine” refer to fluxes in accordance with the present invention in which a significant proportion, i.e. at least 50%, of the particles are in excess of 1 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

Procédé de frittage d'un mélange de minerais de fer durs ou compacts tels que les minerais hématite, et de minerais meubles ou poreux tels que les minerais Yandi. Le procédé consiste à former un mélange vert à partir du mélange de minerais de fer et de flux présentant une répartition granulométrique grossière dans laquelle au moins 50 % des particules ont un diamètre supérieur à 1 mm; à granuler le mélange vert; et à fritter le mélange vert granulé.
PCT/AU1993/000671 1992-12-24 1993-12-22 Traitement de minerais Ceased WO1994014987A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPL6554 1992-12-24
AUPL655492 1992-12-24

Publications (1)

Publication Number Publication Date
WO1994014987A1 true WO1994014987A1 (fr) 1994-07-07

Family

ID=3776624

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1993/000671 Ceased WO1994014987A1 (fr) 1992-12-24 1993-12-22 Traitement de minerais

Country Status (2)

Country Link
CN (1) CN1088990A (fr)
WO (1) WO1994014987A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003012153A1 (fr) * 2001-08-02 2003-02-13 Commonwealth Scientific And Industrial Research Organisation Briquetage de minerai de fer
CN110629017A (zh) * 2019-10-16 2019-12-31 广东韶钢松山股份有限公司 烧结含铁料、烧结组合物，烧结矿及其制备方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101994002B (zh) * 2009-08-25 2012-09-05 山西太钢不锈钢股份有限公司 尖山精矿粉与褐铁矿配矿的烧结方法
CN113528808B (zh) * 2021-05-24 2022-07-01 红河钢铁有限公司 基于高结晶水褐铁矿和磁选尾渣的烧结矿及其生产方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53144412A (en) * 1977-05-23 1978-12-15 Kobe Steel Ltd Method of producing sintered ore
JPS5471004A (en) * 1977-11-16 1979-06-07 Nippon Steel Corp Method of producing sintered mineral excellent in strength to reduction
JPS5579837A (en) * 1978-12-14 1980-06-16 Kawasaki Steel Corp Pretreating method for mgo-containing sintering raw material
JPS57192228A (en) * 1981-05-21 1982-11-26 Nippon Steel Corp Production of sintered ore
JPS5983727A (ja) * 1982-11-02 1984-05-15 Nippon Steel Corp 鉄鉱石焼結原料の製造方法
JPS63282216A (ja) * 1987-05-12 1988-11-18 Nkk Corp 被還元性の優れた焼結鉱の製造方法
JPH01152223A (ja) * 1987-12-10 1989-06-14 Nkk Corp 燒結鉱製造方法
JPH01201427A (ja) * 1987-10-17 1989-08-14 Nippon Steel Corp 焼結原料の装入方法

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53144412A (en) * 1977-05-23 1978-12-15 Kobe Steel Ltd Method of producing sintered ore
JPS5471004A (en) * 1977-11-16 1979-06-07 Nippon Steel Corp Method of producing sintered mineral excellent in strength to reduction
JPS5579837A (en) * 1978-12-14 1980-06-16 Kawasaki Steel Corp Pretreating method for mgo-containing sintering raw material
JPS57192228A (en) * 1981-05-21 1982-11-26 Nippon Steel Corp Production of sintered ore
JPS5983727A (ja) * 1982-11-02 1984-05-15 Nippon Steel Corp 鉄鉱石焼結原料の製造方法
JPS63282216A (ja) * 1987-05-12 1988-11-18 Nkk Corp 被還元性の優れた焼結鉱の製造方法
JPH01201427A (ja) * 1987-10-17 1989-08-14 Nippon Steel Corp 焼結原料の装入方法
JPH01152223A (ja) * 1987-12-10 1989-06-14 Nkk Corp 燒結鉱製造方法

Non-Patent Citations (8)

* Cited by examiner, † Cited by third party
Title
DERWENT ABSTRACT, Accession No. 08681B/05, Class M24; & JP,A,53 144 412 (KOBE STEEL KK), 15 December 1978. *
DERWENT ABSTRACT, Accession No. 53308B/29, Class M24; & JP,A,54 071 004 (NIPPON STEEL CORP), 7 June 1979. *
DERWENT ABSTRACT, Accession No. 54232C/31, Class M24; & JP,A,55 079 837 (KAWASAKI STEEL KK), 16 June 1980. *
DERWENT ABSTRACT, Accession No. 89-003931/01, Class M24; & JP,A,63 282 216 (NIPPON KOKAN KK), 18 November 1988. *
PATENT ABSTRACTS OF JAPAN, C-151, page 104; & JP,A,57 192 228 (SHIN NIPPON SEITETSU KK), 26 November 1982. *
PATENT ABSTRACTS OF JAPAN, C-240, page 137; & JP,A,59 083 727 (SHIN NIPPON SEITETSU KK), 15 May 1984. *
PATENT ABSTRACTS OF JAPAN, C-635, page 121; & JP,A,01 152 223 (NKK CORP), 14 June 1989. *
PATENT ABSTRACTS OF JAPAN, C-653, page 40; & JP,A,01 201 427 (NIPPON STEEL CORP), 14 August 1989. *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003012153A1 (fr) * 2001-08-02 2003-02-13 Commonwealth Scientific And Industrial Research Organisation Briquetage de minerai de fer
WO2003012152A1 (fr) 2001-08-02 2003-02-13 Commonwealth Scientific And Industrial Research Organisation Briquetage de minerai de fer
WO2003012154A1 (fr) * 2001-08-02 2003-02-13 Commonwealth Scientific And Industrial Research Organisation Briquetage des minerais de fer
CN1307317C (zh) * 2001-08-02 2007-03-28 联邦科学及工业研究组织 铁矿石压块
CN100430496C (zh) * 2001-08-02 2008-11-05 联邦科学及工业研究组织 铁矿石压团
KR101067460B1 (ko) * 2001-08-02 2011-09-27 로브 리버 마이닝 컴퍼니 피티와이 리미티드 철광석의 단광 방법
KR101068600B1 (ko) * 2001-08-02 2011-09-30 로브 리버 마이닝 컴퍼니 피티와이 리미티드 철광석의 단광 방법
CN110629017A (zh) * 2019-10-16 2019-12-31 广东韶钢松山股份有限公司 烧结含铁料、烧结组合物，烧结矿及其制备方法
CN110629017B (zh) * 2019-10-16 2021-04-02 广东韶钢松山股份有限公司 烧结含铁料、烧结组合物，烧结矿及其制备方法

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Publication number Publication date
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