WO2001007670A1 - Method for the preparation of fine grain ores - Google Patents
Method for the preparation of fine grain ores Download PDFInfo
- Publication number
- WO2001007670A1 WO2001007670A1 PCT/EP2000/005565 EP0005565W WO0107670A1 WO 2001007670 A1 WO2001007670 A1 WO 2001007670A1 EP 0005565 W EP0005565 W EP 0005565W WO 0107670 A1 WO0107670 A1 WO 0107670A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fraction
- gas
- fine
- ultrafine
- line
- Prior art date
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
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0033—In fluidised bed furnaces or apparatus containing a dispersion of the material
-
- 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
- C22B7/005—Separation by a physical processing technique only, e.g. by mechanical breaking
-
- 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
Definitions
- the present invention relates to a method for processing fine-grained ore, the ore being subjected to wind sifting by means of a gas, in which two fractions are formed, etc. a coarse fraction and a first fine fraction, the coarse fraction being separated and the first fine fraction being entrained with the gas, then being separated from the gas and being at least largely processed together with the coarse fraction for processing, and a plant for carrying out the method.
- cyclones are used to separate and recycle the material discharged with the fluidizing gas.
- the separation performance i.e. the efficiency and the separation size of the cyclones is impaired by the formation of caking and buildup in the cyclone, as a result of which more material is discharged from the fluidized bed reactor with the fluidizing gas.
- direct reduction of fine-grain ore for example iron ore
- the resulting increased material discharge can either be booked as a loss or there are problems in multi-stage processes in subsequent fluidized bed reactors due to clogging of the holes in the distributor plates of these fluidized bed reactors.
- a method of this type is known for example from AT-B-400 578.
- fine ore is dried with the aid of a hot drying gas flowing around the ore particles of the fine ore, and the drying gas after Flow around the ore particles cleaned with the release of entrained dust ore particles.
- the dust ore particles are collected and mixed into the dried fine ore.
- the drying is carried out with simultaneous air separation of the fine ore in a fluidized bed process, the drying gas being passed through the fine ore to form a fluidized bed and the speed of the drying gas being set at a level at which entrainment of dust ore particles is less than a preselected size exhibit.
- the dust ore particles entrained by the drying gas are separated, collected and mixed in a metered amount with the dried fine ore.
- the fine ore can cause problems in that it leads to caking and buildup in the fluidized bed reactor in an at least partially reduced state.
- DE-A-197 11 629 shows a method for preparing fine ores with a broad grain size spectrum for direct reduction as known, in which the fine ores of the grain fraction are less than 6.3 mm and preferably less than 3 mm by means of a hot air or flue gas stream during a pneumatic Conveying process, if necessary with recycling of the moist material, are dried, the fraction 6.3 mm or 3 mm to about 0.04 mm being sifted out of the dried fine ore and being fed to the direct reduction.
- the fine ore fraction smaller than approx. 0.04 mm which is discharged together with the drying air or the flue gas from the cyclone downstream of the dryer, is separated into a multi-cyclone for fine separation.
- the fine ore deposited there is fed to a pelletizing device and, with the addition of water and binder, formed into pellets, which are finally fed into the dryer via a conveying device.
- the multicyclone provided for the finest separation is very complex in terms of equipment.
- the present invention aims to provide a method for processing fine-grained ore and a plant for carrying out the method, according to which the ore is processed in such a way that the subsequent use of the ore in a fluidized bed reactor, the problems mentioned above such as caking and buildup in a cyclone and in a fluidized bed reactor are avoided.
- the method should be simple and can be carried out without great expenditure on equipment.
- This object is achieved according to the invention in a method of the type described in the introduction in that the first fine fraction is subjected to a further air separation by means of a gas, a second fine fraction and an ultra-fine fraction being formed and the second fine fraction being fed to the processing together with the coarse fraction and the ultra-fine fraction entrained with the gas and then separated from the gas.
- the invention is based on the knowledge that the ultra-fine fraction of the ore in the at least partially reduced state is primarily responsible for caking and buildup in fluidized bed reactors. Furthermore, it was recognized that this ultrafine fraction adheres to the first fine fraction separated from the feed material by means of the first wind sifting. After a reduction, i.e. in the at least partially reduced state, when the second fine fraction is processed together with the coarse fraction, as is known, for example, from the above-mentioned AT-B-400 578, the ultrafine fraction causes the problems mentioned in the fluidized bed reactor. According to the invention, this is avoided by separating the ultrafine fraction from the first fine fraction.
- the ultrafine fraction separated from the gas is preferably granulated with the addition of a binder and fed to processing or discharged. In the case of granulation and further processing, the ultrafine fraction is advantageously not lost for subsequent processes.
- a granulate formed from the ultra-fine fraction is expediently processed further together with the coarse fraction and the second fine fraction.
- further processing consists of a direct reduction downstream of the ore processing.
- a granulate formed from the ultrafine fraction can also be mixed with the fine-grained ore to be subjected to the first air classification.
- Gas from the entrained ultrafine fraction is expediently subjected to a further purification, an ultrafine fraction being separated out, which, preferably together with the ultrafine fraction, is granulated and fed to processing or discharged. This also enables the extensive use of the dust that is still present in the gas after the ultrafine fraction has been separated.
- At least a portion of the second fine fraction is also granulated, preferably together with the ultra-fine and / or ultra-fine fraction. Problems with caking and build-up of dusty ore in subsequent processes can be avoided particularly reliably.
- the first fine fraction is preferably deposited with a particle size of up to 150 ⁇ m by means of the first air sifting, and the ultrafine fraction with a particle size of up to 20 ⁇ m is separated out from the first fine fraction by means of the further wind sifting.
- a drying gas is used at least in the first wind sifting.
- drying takes place simultaneously.
- Quicklime or bentonite is advantageously used as a binder in the granulation.
- Gas used in the first air sifting and cleaned from the first fine fraction is preferably also used in the further air sifting.
- a system for carrying out the method according to the invention with a first air classifier, provided with a feed for fine-grain ore, a gas feed line, a discharge line for a coarse fraction and a discharge line for gas and a first fine fraction entrained with the gas, and with a downstream air separator, the first fine fraction from the gas-separating first gas cleaning device is characterized in that a discharge line for the first fine fraction from the first gas cleaning device is connected by line to a further air classifier which has a gas supply line, a discharge line for a second fine fraction and a discharge line for gas and an ultrafine fraction entrained with the gas, and that the further air classifier is followed by a second gas cleaning device which separates the ultrafine fraction from the gas.
- a line for the ultrafine fraction from the second gas cleaning device is preferably connected in line with a granulating device, a feed line for a binder opening into the granulating device.
- the granulating device is connected in line with the feed for fine-grain ore to the first air classifier.
- a common discharge device is advantageously provided for the coarse fraction, the second fine fraction and the ultrafine fraction which has been subjected to granulation.
- the gas cleaning devices are expediently designed as cyclones.
- the second gas cleaning device is followed by a further gas cleaning device for separating an ultrafine fraction entrained in the gas, a line for the ultrafine fraction from the further gas cleaning device being connected in line with a granulating device.
- the discharge for the second fine fraction from the further air classifier is connected in line with a granulating device.
- At least the first air classifier is expediently designed as a dryer, a supply line for drying gas opening into the air classifier.
- a gas discharge from the first gas cleaning device is advantageously connected in line with the gas supply line to the further air classifier.
- the invention is explained below with reference to the drawing and an exemplary embodiment.
- the figure shows schematically a flow diagram of a preferred embodiment of the invention.
- the figure shows a wind sifter 1 designed as a fluidized bed unit, into which fine-grain ore 2 is introduced via a feed 3.
- the fine-grained ore 2 which forms a bed 4 in the air classifier 1, is swirled by means of a gas supplied via a feed line 5 and wind-sighted.
- the fine-grained ore 2 used has a grain size of 0 to 12 mm in the embodiment shown.
- air separation it is separated into the coarse fraction 6 with a grain size of 0.15 to 12 mm and into the first fine fraction 8 with a grain size of 0 to 0.15 mm.
- a drying gas is used as the gas, and the fine-grained ore 2 is also subjected to drying in addition to air separation.
- the coarse fraction 6 drawn off via the discharge line 7 is applied to a discharge device designed as a conveyor belt 9 and fed to a further processing, for example a direct reduction.
- the first fine fraction 8 is discharged with the gas via a discharge line 10 from the air classifier 1 and separated from the gas.
- an impact separator 11 and a cyclone 12 are used.
- the separated fine fraction 8 reaches a storage bunker 13 and from there via a line 14 to a further air classifier 15, which is also designed as a fluidized bed unit.
- the first fine fraction 8 forms a bed 16 in the further air classifier 15.
- the gas which is cleaned by means of the cyclone 12 from the first fine fraction 8 is used and is supplied via a feed line 17.
- the first fine fraction 8 with a grain size of 0 to 0.15 mm is separated into a second fine fraction 18 with a grain size of 20 to 150 ⁇ m and an ultra-fine fraction 19 with a grain size of 0 to 20 ⁇ m.
- the second fine fraction 18 is drawn off from the further air classifier 15 via a discharge line 20, applied to the conveyor belt 9 and fed together with the coarse fraction 6 for further processing.
- the gas and the ultrafine fraction 19 entrained with the gas are drawn off from the further air classifier 15 via a discharge line 21.
- the gas is cleaned by means of a cyclone 22, the ultrafine fraction 19 being separated off.
- the ultrafine fraction 19 enters a storage bunker 23 and from there to a granulating device 24.
- a feed line 25 for a binder 26 for granulating the ultrafine fraction 19 opens into the granulating device 24.
- quicklime or bentonite is used as the binder 26.
- the ultrafine fraction 19 is granulated into granules 27 with a grain size of 0.5 to 4 mm, and the granules 27 are also applied to the conveyor belt 9. Together with the coarse fraction 6 and the second fine fraction 18, it is fed to further processing.
- the granules 27 can also be fed to the first air classifier 1 via a line (not shown in the figure), in which it is used together with the fine-grain ore 2.
- the ultrafine fraction 19 is not fed to the granulating device 24, but, as shown in the figure by the dashed line 28, is discharged and, for example, placed in a landfill.
- the advantage of this approach is that the granulation of the ultrafine fraction 19, which in terms of quantity makes up a relatively small proportion of the total use of the fine-grained ore 2, is saved, but it is also prevented that the ultrafine fraction 19 has a disruptive effect in subsequent processing processes. in particular caused caking and buildup.
- the low loss of input material plays only a minor role at low ore prices.
- the gas cleaned by means of the cyclone 22 is fed to a further gas cleaning device 29, which can be an electrostatic filter, for example.
- a further gas cleaning device 29 By means of the further gas cleaning device 29, an ultrafine fraction 30 which is entrained after cleaning in the cyclone 22 is separated out, which is likewise fed to the granulating device 24 and is granulated together with the ultrafine fraction 19.
- the ultra-fine fraction 30 can equally be discharged and deposited, as indicated by the dashed line 28 in the figure.
- the second fine fraction 18 discharged from the second wind sifter 15, which is not entrained with the gas, can at least partially be fed to the granulating device 24 via a line 31 shown in broken lines in the figure, in which it granulates and together with the ultra-fine fraction 19 and the ultra-fine fraction 30 is further processed.
- Fine-grain ore 2 with a grain size of 0 to 12 mm which represents 100% feed material, is introduced into the first air classifier 1 and into a coarse fraction 6 with a grain size of 0.15 to 12 mm and a first fine fraction 8 with a grain size of 0 separated up to 0.15 mm.
- the coarse fraction 6 makes up 67% of the use.
- the first fine fraction which accounts for 33% of the use, is introduced into the further air classifier 15 and separated into a second fine fraction 18 with a grain size of 20 to 150 ⁇ m and an ultra-fine fraction 19 with a grain size of 0 to 20 ⁇ m.
- the second fine fraction 18 makes up 29% of the fine-grained ore 2 used, and the ultra-fine fraction 19 makes up 4% of the feed material.
- An ultrafine fraction 30 with a grain size of up to 1 ⁇ m is separated from the gas cleaned by the ultrafine fraction 19 by means of an electrostatic filter.
- the invention is not restricted to the above exemplary embodiment. Of course there are wide possibilities of variation with regard to the grain size of the material used as well as in relation to the grain size of the separated fractions and their proportion of the material used.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Dispersion Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Combined Means For Separation Of Solids (AREA)
- Separating Particles In Gases By Inertia (AREA)
- Electrostatic Separation (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA 2378956 CA2378956A1 (en) | 1999-07-27 | 2000-06-16 | Method for the preparation of fine grain ores |
JP2001512935A JP2003505240A (en) | 1999-07-27 | 2000-06-16 | Beneficiation process of granular ore |
AU56826/00A AU5682600A (en) | 1999-07-27 | 2000-06-16 | Method for the preparation of fine grain ores |
EP00942084A EP1204773A1 (en) | 1999-07-27 | 2000-06-16 | Method for the preparation of fine grain ores |
KR1020027001091A KR20020016918A (en) | 1999-07-27 | 2000-06-16 | Method for the preparation of fine grain ores |
MXPA02000629A MXPA02000629A (en) | 1999-07-27 | 2000-06-16 | Method for the preparation of fine grain ores. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ATA1300/99 | 1999-07-27 | ||
AT0130099A AT407346B (en) | 1999-07-27 | 1999-07-27 | METHOD FOR PROCESSING FINE-GRAIN ORE |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001007670A1 true WO2001007670A1 (en) | 2001-02-01 |
Family
ID=3510913
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2000/005565 WO2001007670A1 (en) | 1999-07-27 | 2000-06-16 | Method for the preparation of fine grain ores |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP1204773A1 (en) |
JP (1) | JP2003505240A (en) |
KR (1) | KR20020016918A (en) |
AT (1) | AT407346B (en) |
AU (1) | AU5682600A (en) |
CA (1) | CA2378956A1 (en) |
MX (1) | MXPA02000629A (en) |
WO (1) | WO2001007670A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007216171A (en) * | 2006-02-17 | 2007-08-30 | Meiji Univ | Apparatus and method for separating powder |
JP5827648B2 (en) * | 2013-07-25 | 2015-12-02 | 株式会社神戸製鋼所 | Method for producing agglomerates |
CN109894367A (en) * | 2017-12-11 | 2019-06-18 | 南京梅山冶金发展有限公司 | A kind of large blast furnace lump ore Screening Treatment method |
CN114653594B (en) * | 2022-04-15 | 2023-05-30 | 广东亨益环保集团有限公司 | Post-type combined sorting process for sorting stock household garbage by using two-stage roller |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1224933B (en) * | 1962-05-07 | 1966-09-15 | Allied Chem | Process for the production of Roestblende |
US3917480A (en) * | 1973-08-06 | 1975-11-04 | Centro Speriment Metallurg | Process for preparing the feed solid charge for fluid bed reactors |
US5676734A (en) * | 1994-03-24 | 1997-10-14 | Voest-Alpine Industrieanlagenbau Gmbh | Method of treating fine ore |
EP0877095A2 (en) * | 1997-03-20 | 1998-11-11 | Ferrostaal AG | process and apparatus for preparing powdery ores for direct reduction |
-
1999
- 1999-07-27 AT AT0130099A patent/AT407346B/en not_active IP Right Cessation
-
2000
- 2000-06-16 MX MXPA02000629A patent/MXPA02000629A/en not_active Application Discontinuation
- 2000-06-16 CA CA 2378956 patent/CA2378956A1/en not_active Abandoned
- 2000-06-16 KR KR1020027001091A patent/KR20020016918A/en not_active Application Discontinuation
- 2000-06-16 AU AU56826/00A patent/AU5682600A/en not_active Abandoned
- 2000-06-16 WO PCT/EP2000/005565 patent/WO2001007670A1/en not_active Application Discontinuation
- 2000-06-16 EP EP00942084A patent/EP1204773A1/en not_active Withdrawn
- 2000-06-16 JP JP2001512935A patent/JP2003505240A/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1224933B (en) * | 1962-05-07 | 1966-09-15 | Allied Chem | Process for the production of Roestblende |
US3917480A (en) * | 1973-08-06 | 1975-11-04 | Centro Speriment Metallurg | Process for preparing the feed solid charge for fluid bed reactors |
US5676734A (en) * | 1994-03-24 | 1997-10-14 | Voest-Alpine Industrieanlagenbau Gmbh | Method of treating fine ore |
EP0877095A2 (en) * | 1997-03-20 | 1998-11-11 | Ferrostaal AG | process and apparatus for preparing powdery ores for direct reduction |
Also Published As
Publication number | Publication date |
---|---|
JP2003505240A (en) | 2003-02-12 |
KR20020016918A (en) | 2002-03-06 |
CA2378956A1 (en) | 2001-02-01 |
ATA130099A (en) | 2000-07-15 |
EP1204773A1 (en) | 2002-05-15 |
MXPA02000629A (en) | 2002-08-30 |
AU5682600A (en) | 2001-02-13 |
AT407346B (en) | 2001-02-26 |
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