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EP3253896A1 - Procédé et dispositif pour préparer un concentré de chromite pour agglomération et frittage, et charge d'alimentation pour agglomération - Google Patents

Procédé et dispositif pour préparer un concentré de chromite pour agglomération et frittage, et charge d'alimentation pour agglomération

Info

Publication number
EP3253896A1
EP3253896A1 EP16704030.2A EP16704030A EP3253896A1 EP 3253896 A1 EP3253896 A1 EP 3253896A1 EP 16704030 A EP16704030 A EP 16704030A EP 3253896 A1 EP3253896 A1 EP 3253896A1
Authority
EP
European Patent Office
Prior art keywords
feed
pelletizing
fluxing agent
arrangement
slag
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.)
Withdrawn
Application number
EP16704030.2A
Other languages
German (de)
English (en)
Inventor
Helge Krogerus
Pasi MÄKELÄ
Jarmo Saarenmaa
Sauli PISILÄ
Petri PALOVAARA
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.)
Outotec Finland Oy
Original Assignee
Outotec Finland Oy
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 Outotec Finland Oy filed Critical Outotec Finland Oy
Publication of EP3253896A1 publication Critical patent/EP3253896A1/fr
Withdrawn legal-status Critical Current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
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/2406—Binding; Briquetting ; Granulating pelletizing
    • 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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/5264—Manufacture of alloyed steels including ferro-alloys
    • 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
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/076—Use of slags or fluxes as treating agents
    • 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
    • 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
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/244—Binding; Briquetting ; Granulating with binders organic
    • C22B1/245—Binding; Briquetting ; Granulating with binders organic with carbonaceous material for the production of coked agglomerates
    • 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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/10—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with refining or fluxing agents; Use of materials therefor, e.g. slagging or scorifying agents
    • C22B9/103—Methods of introduction of solid or liquid refining or fluxing agents
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • 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 invention relates to a method to prepare chromite concentrate for pelletizing and sintering as defined in the preamble of independent claim 1.
  • the invention also relates to an arrangement to prepare chromite concentrate for pelletizing and sintering as defined in the preamble of independent claim 6.
  • the invention also relates to a pelletizing feed as defined in the preamble of independent claim 13.
  • Publication WO 2013/071955 presents a process for the manufacture of ferrochrome alloy comprising the steps of providing a pelletizing feed, wherein the pelletizing feed comprises chromite concentrate and silicon carbide as the only carbonaceous material and the only reducing agent; pelletizing the pelletizing feed to obtain pellets; sintering the pellets to obtain sintered pellets; mixing the sintered pellets with external reducing agent to obtain smelting feed; and smelting the smelting feed.
  • Publication WO 2013/071955 presents a pelletizing feed containing chromite ore, at least one nickel salt, and silicon carbide as the only carbonaceous material and the only reducing agent.
  • the invention also relates to process for manufacturing the pelletizing feed comprising the steps providing chromite, at least one nickel salt and silicon carbide, and mixing chromite, at least one nickel salt and silicon carbide.
  • the invention also relates to use of the pelletizing feed as a starting material for the manufacture of sintering feed.
  • the invention also relates to a sintering feed in the form of pellets containing the pelletizing feed.
  • the invention also relates to sintered pellets containing the sintering feed.
  • the invention also relates to process for manufacturing the sintered pellets.
  • the invention also relates to use of the sintered pellets as a component of smelting feed.
  • the invention also relates to smelting feed comprising sintered pellets.
  • the invention also relates to process for manufacturing ferrochrome alloy.
  • the invention also relates to ferrochrome alloy obtainable by the method.
  • the pelletizing feed from which the sintered pellets are made, may comprise fluxing agents, such as limestone, dolomite, quarts, calcite or wollastonite and any mixture thereof.
  • fluxing agents such as limestone, dolomite, quarts, calcite or wollastonite and any mixture thereof.
  • a reason for adding fluxing agent to the pelletizing feed is to achieve sufficient compressive strength of the sintered pellets which are produced in the subsequent sintering process by using the pelletizing feed.
  • a sufficient compressive strength Fi2mm is typically between 180 and 220 kg.
  • a disadvantage by using the fluxing agents mentioned in publication WO 2013/071955 and in publication WO 2013/071955, limestone, dolomite, quarts, calcite or wollastonite and any mixture thereof, is that these are relatively expensive.
  • Publication US 3,825,638 presents a method for producing cold bound agglomerates from particulate iron oxide containing mineral concentrates using a steam liardenable binder.
  • the binder is ground down together with iron oxide material at a high energy input to produce a fine grain additive material.
  • the additive material is then mixed with the mineral concentrates and agglomerates are formed from the mixture and steam hardened.
  • Publication WO 2015/003669 relates to fluxing agents for the agglomeration process based on slag from the secondary metallurgy, the use of these fluxing agents in the process of agglomeration in the manufacture of the agglomerate designed for the use as a metallic charge in blast furnaces and a process of production of fluxing agents based on slag from the secondary metallurgy or based on a mixture of slag from the secondary metallurgy with other materials.
  • An object of the invention is to provide a method and an arrangement to prepare chromite ore for pelletizing and sintering and correspondingly to provide a pelletizing feed by means of which a pelletizing feed, containing fluxing agent for obtaining sufficient strength of the sintered pellets which are produced in the subsequent sintering process by using the pelletizing feed, can be obtained by using less expensive raw material.
  • the invention relates also to the use of the method according to any of the claims 1 to 5 in a process for producing ferrochrome alloy from chromite concentrate.
  • the invention relates also to the use of the arrangement according to any of the claims 6 to 10 in an arrangement for producing ferrochrome alloy from chromite concentrate.
  • the pelletizing feed is correspondingly characterized by the definitions of independent claim 13.
  • the invention relates also to sintered pellets as defined in claim 18 containing the pelletizing feed according to any of the claims 13 to 17.
  • the invention relates also to the in claim 19 defined use of the sintered pellets according to claim 18 as a component of smelting feed.
  • the invention relates also to a smelting feed as defined in claim 20 containing the sintered pellets according to claim 18.
  • the invention relates also to a process as defined in claim 21 for manufacturing ferrochrome alloy comprising the step of smelting the smelting feed according to claim 20.
  • the invention relates also to ferrochrome alloy as defined in claim 22 and obtainable by the process according to claim 21.
  • the invention is based on that the fluxing agent that is used is at least partly slag originating from processing of ferrous metal.
  • the compressive strength of the sintered pellets Fi2mm can be calculated according to the following formula:
  • Figure 1 is a schematic flow chart of a first embodiment of equipment containing an arrangement according to an embodiment of the invention
  • Figure 2 is a schematic flow chart of a second embodiment of equipment containing an arrangement according to an embodiment of the invention
  • Figure 3 is a schematic flow chart of a third embodiment of equipment containing an arrangement according to an embodiment of the invention.
  • Figure 4 is a schematic flow chart of a fourth embodiment of equipment containing an arrangement according to an embodiment of the invention.
  • Chromite is the ore which is excavated from the chromite deposit.
  • the chromite concentrate is the product of the beneficiation plant.
  • the ganque components are mainly separated to the wastes for improving the grade of chromite for the pelletizing and sintering.
  • the method comprises a providing step for providing a chromite concentrate feed 1 and an adding step for adding at least fluxing agent 2 to the chromite concentrate feed 1 to obtain a pelletizing feed 12.
  • a purpose of the fluxing agent 2 is to lower the melting point of the slag forming components in the pelletizing feed 12 and to provide more slag forming components to the pelletizing feed 12.
  • Another purpose of the fluxing agent is to during a sintering process, where pellets previously formed of the pelletizing feed 12 is sintered into sintered pellets, to provide more connections and connections of better quality in the sintered pellets by melting and subsequently solidifying the binding silicates in the fluxing agent 2.
  • the method may include a fine-dividing step for fine-dividing the chromite concentrate feed 1 to a particle size distribution of 70 to 90 % below 74 ⁇ , preferably 80+2% below 74 ⁇ , and more preferably about 80% below 74 ⁇ for example in a mill 3.
  • fluxing agent 2 in the form of slag 4 originating from processing of ferrous metal is added to the chromite concentrate feed 1.
  • the particle size distribution of the fluxing agent 2 may be 80 to 100%, preferably 100 % below 74 ⁇ (200 mesh).
  • the method may include a fine-dividing step for fine-dividing the slag 4 prior the adding step for example by milling in a mill 3.
  • the chromite concentrate feed 1 additionally at least one of the following may be added to the chromite concentrate feed 1: (i) carbonaceous material 6 such as coke, (ii) dust 7, and (iii) binding agent 8 such as bentonite for example sodium- activated calcium betonite, water-based binding agent, and/or organic binding agent.
  • carbonaceous material 6 such as coke
  • dust 7 and binding agent 8 such as bentonite for example sodium- activated calcium betonite, water-based binding agent, and/or organic binding agent.
  • binding agent 8 such as bentonite for example sodium- activated calcium betonite, water-based binding agent, and/or organic binding agent.
  • the purpose of the possible binding agent 8 is give the pellets, which are produced from the pelletizing feed 12, enough dry- and wet strength so that the pellets can firstly withstand transportation from a means for forming pellets such as from a pelletizing drum or disc 16 to a sintering means such as to a steel belt sintering furnace 19, where the pellets are strengthened by performing sintering to produced sintered pellets and secondly withstand drying, heating, sintering in the sintering means until a desired strengthening by sintering is achieved.
  • the strengthening effect of the binding agent in the resulting sintered pellets is quite marginal in comparison to the strengthening effect resulting from fluxing agent and gangue minerals in the chromite concentrate in sintering.
  • Binding agent 8 in the form of bentonite can for example contain the following in percentages of weight:
  • Si0 2 between 30 and 80 %
  • A1 2 0 3 between 0 and 40 %
  • an amount of carbonaceous material 6 may be added to the chromite concentrate feed 1 so that the amount of added carbonaceous material 6 in the resulting pelletizing feed 12 in terms of percentages of weight of the pelletizing feed 12 is between 0.5 % and 3 %.
  • the particle distribution of the of the carbonaceous material 6 is preferably between 70 and 80 % below 74 ⁇ , more preferably 75+2% below 74 ⁇ , such as 75% below 74 ⁇ .
  • an amount of dust 7 may be added so that the amount of added dust 7 in the resulting pelletizing feed in terms of percentages of weight of the pelletizing feed 12 is between 3 and 12 %.
  • the particle distribution of the dust 7 is preferably between 75 and 100 % below 74 ⁇ .
  • an amount of binding agent 8 may be added so that the amount of added binding agent 8 in the resulting pelletizing fees in terms of percentages of weight of the pelletizing feed 12 is between 0.5 and 3 %, preferably between 0.75 and 2.5 %, even more preferably between 1.0 and 2.5 %, such as 1.5 %.
  • the particle distribution of the binding agent is preferable 100% below 74 ⁇ .
  • slag 4 originating from processing of ferrous metal may be added to fluxing agent 2 prior the adding step so that fluxing agent 2 in the form or at least one of limestone, dolomite, quarts, or wollastonite and any mixture thereof and fluxing agent 2 in the form of slag 4 are at least partly mixed together prior the adding step.
  • fluxing agent 2 in the form or at least one of limestone, dolomite, quarts, or wollastonite and any mixture thereof and fluxing agent 2 in the form of slag 4 are at least partly mixed together prior the adding step.
  • fluxing agent 2 in the form or at least one of limestone, dolomite, quarts, or wollastonite and any mixture thereof and fluxing agent 2 in the form of slag 4 may be separately added to the chromite concentrate feed 1 in the adding step.
  • Such embodiments are illustrated in figures 2 and 4.
  • fluxing agent 2 containing in percentages of weight between 10 and 100 %, preferably between 50 and 100 %, more preferably between 75 and 100 % slag 4 originating from processing of ferrous metal, may be added to the chromite ore feed 1. It is also possible to in adding step of the method to add fluxing agent 2 consisting solely of slag 4 originating from processing of ferrous metal to the chromite concentrate feed 1.
  • an amount of fluxing agent 2 may be added to the chromite concentrate feed 1 so that the resulting pelletizing feed 12 contains in percentages of weight between 1 and 10 %, preferably between 2 and 7 %, more preferable between 3 and 6 %, such as between 4 and 5 % fluxing agent 2.
  • the slag 4 originating from processing of ferrous metal and that is used as fluxing agent 2 in the adding step of the method may contain in percentages of weight:
  • CaO between 20 and 50 %, preferably between 35 and 45 %
  • SiC between 20 and 50 %, preferably between 30 and 40 %
  • MgO between 1 and 20 %, preferably between 5 and 15 %
  • AI2O3 between 1 and 20 %, preferably between 5 and 15 %
  • T1O2 between 0 and 50 %, preferably between 0 and 15 %
  • K 2 0 less than 5 %, preferably less than 1 %
  • Na 2 0 less than 5 %, preferably less than 1 %
  • the method may be used process for manufacturing ferrochrome alloy from chromite concentrate 5 such as in a process of the type as presented in publication WO 2012/172174.
  • the arrangement comprises a first feeding arrangement 9 for providing a chromite concentrate feed 1, and a second feeding arrangement 10 comprising at least a first feeding means (not marked with a reference numeral) for adding fluxing agent 2 to the chromite ore feed 1 to obtain a pelletizing feed 12.
  • the arrangement may comprise a mill 2 for fine-dividing the chromite concentrate feed 1.
  • the arrangement may comprise a drying means 11 for reducing the moisture content the chromite concentrate feed 1.
  • the first feeding means of the second feeding arrangement 10 is configured to add to the chromite concentrate feed 1 fluxing agent 2 containing slag 4 originating from processing of ferrous metal.
  • the second feeding arrangement 10 may comprise additionally at least one of the following: a second feeding means (not marked with a reference numeral) for adding carbonaceous material 6 such as coke to the chromite ore feed 1, a third feeding means (not marked with a reference numeral) for adding dust 7 to the chromite ore feed 1, and a fourth feeding means (not marked with a reference numeral) for adding binding agent 8 such as bentonite to the chromite ore feed 1.
  • the first feeding means of the second feeding arrangement 10 may be configured to add to the chromite concentrate feed 1 fluxing agent 2 containing in percentages of weight between 10 and 100 %, preferably between 50 and 100 %, more preferably between 75 and 100 % slag 4 originating from processing of ferrous metal.
  • the first feeding means of the second feeding arrangement 10 may be configured to add fluxing agent 2 to the chromite concentrate feed 1 so that the pelletizing feed 12 obtained containing in percentages of weight between 1 and 10 %, preferably between 2 and 7 %, more preferable between 3 and 6 %, such as between 4 and 5 % fluxing agent 2.
  • the first feeding means of the second feeding arrangement 10 may be configured to add fluxing agent 2 in the form of slag 4 originating from processing of ferrous metal containing in percentages of weight:
  • CaO between 20 and 50 %, preferably between 35 and 45 %
  • Si0 2 between 20 and 50 %, preferably between 30 and 40 %
  • MgO between 1 and 20 %, preferably between 5 and 15 %
  • A1 2 0 3 between 1 and 20 %, preferably between 5 and 15 % ⁇ 2 0: less than 5 %, preferably less than 1 %
  • Na 2 0 less than 5 %, preferably less than 1 %
  • the arrangement may be used in an equipment for manufacturing ferrochrome alloy from chromite concentrate 5 such as in an equipment of the type as presented in publication WO 2012/172174.
  • the equipment presented in figures 1 and 3 comprises a slurry mixer 13, which is configured to mix the chromite concentrate feed 1 discharged from the mill 3.
  • the equipment presented in figures 1 and 3 comprises a filter 14, which is configured to dewater the chromite concentrate feed 1.
  • the equipment presented in the figures comprises a mixer 15, which is configured to mix the pelletizing feed 14 formed of chromite concentrate feed 1 and the fluxing agent 2 containing slag 4 and the optional carbonaceous material 6, dust 7, and binding agent 8.
  • the equipment presented in the figures comprises a pelletizing drum or disc 16, which is configured to pelletize the pelletizing feed 14 to form pellets 17.
  • the equipment presented in the figures comprises a roller screen 18, which is configured to ensure that uniformly sized pellets only are fed as an even pellet bed to an endless conveyor belt of a steel belt sintering furnace 19 so as to form sintered pellets 20 of the pellets 17.
  • the equipment presented in the figures comprises a third feeding arrangement 21 for feeding sintered pellets 21 together with additives such as lumpy ore, coke and quartz into a preheating kiln 22, which is configured to preheat the sintered pellets 21 prior charging the sintered pellets 21 into an smelting furnace 23. From the smelting furnace ferrochrome alloy 24 is discharged.
  • a third feeding arrangement 21 for feeding sintered pellets 21 together with additives such as lumpy ore, coke and quartz into a preheating kiln 22, which is configured to preheat the sintered pellets 21 prior charging the sintered pellets 21 into an smelting furnace 23. From the smelting furnace ferrochrome alloy 24 is discharged.
  • the equipment presented in the figures comprises also a high pressure water scrubber 25 for cleaning gas originating from the smelting furnace.
  • the equipment presented in figures 3 and 4 comprises also a burning means 25 that is arranged to receive carbon monoxide (CO) from the high pressure water scrubber 25 and to burn carbon monoxide (CO) to produce thermal energy for the drying means 11.
  • a burning means 25 that is arranged to receive carbon monoxide (CO) from the high pressure water scrubber 25 and to burn carbon monoxide (CO) to produce thermal energy for the drying means 11.
  • pelletizing feed 12 containing chromite concentrate 5 and fluxing agent 2 will be described in greater detail.
  • the fluxing agent 2 contains slag 4 originating from processing of ferrous metal.
  • the pelletizing feed 12 may contain additionally at least one of the following: (i) carbonaceous material 6 such as coke, (ii) dust 7, and (iii) binding agent 8 such as bentonite.
  • the fluxing agent 2 may contain in percentages of weight between 10 and 100 , preferably between 50 and 100 , more preferably between 75 and 100 % slag 4 originating from processing of ferrous metal.
  • the pelletizing feed 12 may contain in percentages of weight between 1 and 10 , preferably between 2 and 7 , more preferable between 3 and 6 , such as between 4 and 5 % fluxing agent 2.
  • the slag 4 originating from processing of ferrous metal may contain in percentages of weight:
  • CaO between 20 and 50 %, preferably between 35 and 45 %
  • SiC between 20 and 50 %, preferably between 30 and 40 %
  • MgO between 1 and 20 %, preferably between 5 and 15 %
  • AI2O3 between 1 and 20 %, preferably between 5 and 15 %
  • K2O less than 5 %, preferably less than 1 %
  • test materials CI and C2 were twelve (12) lab tests were performed with test materials CI and C2 using bentonite as binding agent and as fluxing agents wollastonite, calcite, dolomite and slag originating from a blast furnace.
  • test materials CI and C3 had the composition in percentages of weight mentioned in table 1.
  • the slag had the following composition in percentages of weight:
  • the pelletizing was carried out on a laboratory disc with a diameter of 400 mm and a depth of 150 mm. The moisture content, wet and dry strength of pellets was measured.
  • Bentonite was used as a binder in the pelletizing.
  • the pelletizing mixture consisted of ground chromite concentrate and wollastonite, limestone and blast furnace slag as fluxes.
  • the pelletizing batch was mixed very carefully in a twin- shell mixer for 120 minutes.
  • the mixed batch was fed onto the disc manually.
  • the batch was moistened with a water sprayer bottle according to the formation of the pellets.
  • the desired diameter of pellets is 12 mm.
  • the amount of fluxes was added according to the characteristics of the pellets.
  • the diameter and compressive strength of the wet and dried pellets was measured.
  • the moisture content of the pellets was also measured.
  • the aim of the sintering was to perform the tests for achieving a satisfactory strength of the sintered pellets, about 200 kg/ pellet (a diameter 12 mm).
  • the sintering was carried out in high aluminium crucible (0.25 litres) in an induction furnace.
  • the sintering temperature was estimated to be in the range of 1300 -1450°C. Air was blown to the crucible to achieve oxidising sintering conditions. According to normal practice the temperature of the charge is measured during the tests. The batch was cooled by air and the samples are taken for analysing.

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

Abstract

L'invention concerne un procédé et un dispositif pour préparer de minerai de chromite (5) destiné à être aggloméré et fritté. L'invention porte également sur une charge d'alimentation d'agglomération. Le procédé comprend une étape de fourniture, consistant à fournir une charge d'alimentation à base de concentré de chromite (1), et une étape d'addition consistant à ajouter au moins un agent de fluxage (2) à la charge d'alimentation à base de concentré de chromite (1) pour obtenir une charge d'alimentation d'agglomération (12). L'agent de fluxage (2) est au moins partiellement sous la forme de laitier (4) provenant du traitement d'un métal ferreux.
EP16704030.2A 2015-02-05 2016-02-05 Procédé et dispositif pour préparer un concentré de chromite pour agglomération et frittage, et charge d'alimentation pour agglomération Withdrawn EP3253896A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20155075A FI127031B (en) 2015-02-05 2015-02-05 METHOD AND ORGANIZATION FOR TREATMENT OF CHROMATIC CONCENTRATE FOR PELLETING AND SYNTHETATION AND PELLETABLE FEED
PCT/FI2016/050077 WO2016124823A1 (fr) 2015-02-05 2016-02-05 Procédé et dispositif pour préparer un concentré de chromite pour agglomération et frittage, et charge d'alimentation pour agglomération

Publications (1)

Publication Number Publication Date
EP3253896A1 true EP3253896A1 (fr) 2017-12-13

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP16704030.2A Withdrawn EP3253896A1 (fr) 2015-02-05 2016-02-05 Procédé et dispositif pour préparer un concentré de chromite pour agglomération et frittage, et charge d'alimentation pour agglomération

Country Status (7)

Country Link
EP (1) EP3253896A1 (fr)
CN (1) CN107949646A (fr)
BR (1) BR112017015569A2 (fr)
CA (1) CA2974476A1 (fr)
EA (1) EA201791433A1 (fr)
FI (1) FI127031B (fr)
WO (1) WO2016124823A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB202108524D0 (en) 2021-06-15 2021-07-28 Eestech Inc Improved smelting system

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US4790872A (en) * 1988-01-19 1988-12-13 Hamilton Specialty Bar Division Of Slater Industries, Inc. Additive for promoting slag formation in steel refining ladle
CN101638730B (zh) * 2008-07-31 2015-03-25 塔塔钢铁有限公司 用于从冶金级铬铁矿精矿细粉生产海绵铬的方法
FI9406U1 (fi) 2011-06-15 2011-10-11 Outotec Oyj Laitteisto malmirikasteen valmistamiseksi pelletointia varten
KR101492783B1 (ko) * 2011-11-15 2015-02-12 오토텍 오와이제이 페로크롬의 제조 방법
CN103060548B (zh) * 2013-02-04 2014-05-07 重庆大学 一种基于镍铁冶炼炉渣回收的铬铁矿粉矿烧结处理方法
CZ304951B6 (cs) 2013-07-08 2015-02-04 Ecofer, S.R.O. Tavidlo pro aglomeraci, způsob výroby tavidla, aglomerační směs pro výrobu aglomerátu a použití strusek sekundární metalurgie jako tavidel pro přípravu aglomerační směsi

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CA2974476A1 (fr) 2016-08-11
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WO2016124823A1 (fr) 2016-08-11
FI127031B (en) 2017-10-13
BR112017015569A2 (pt) 2018-03-13
CN107949646A (zh) 2018-04-20

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