SE439327B - PROCEDURE FOR THE PREPARATION OF A SUBSTANCE IN SUCCESSION CHARGES - Google Patents
PROCEDURE FOR THE PREPARATION OF A SUBSTANCE IN SUCCESSION CHARGESInfo
- Publication number
- SE439327B SE439327B SE8008612A SE8008612A SE439327B SE 439327 B SE439327 B SE 439327B SE 8008612 A SE8008612 A SE 8008612A SE 8008612 A SE8008612 A SE 8008612A SE 439327 B SE439327 B SE 439327B
- Authority
- SE
- Sweden
- Prior art keywords
- grained
- curing
- cakes
- fine
- slag
- 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
- C22B1/242—Binding; Briquetting ; Granulating with binders
-
- 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
- C22B1/2413—Binding; Briquetting ; Granulating enduration of pellets
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)
Description
8008612-'7 2 dukt, som har en för sintergods lämplig kornfördelning erbju- der emellertid problem. För bildning av mikropellets erfordras en avsevärd uppfuktning, vilket resulterar i kladdning vid lag- ring, innan härdningen av bindemedlet avslutats. Detta medför behov av speciella åtgärder. Till följd av den höga fukthalten sker härdningen dessutom långsamt och erfordras sumctillsats av bindemedel. However, a product which has a grain distribution suitable for sintering goods presents problems. For the formation of micropellets, a considerable wetting is required, which results in smudge during storage, before the curing of the binder is completed. This entails the need for special measures. Due to the high moisture content, the curing also takes place slowly and the addition of binder is required.
Föreliggande uppfinning har till syfte att anvisa ett nytt och fördelaktigt förfarande för framställning av ett som be- ståndsdel i sugsintingscharger lämpat gods ur finkornigt järn- oxidmaterial, såsom finkorniga järnmalmssliger, kisbränder, stoft från syrgasblâsning och andra metallurgiska mellanproduk- ter, genom agglomerering av materialet, genom vilket förfarande de ovan angivna olägenheterna i åtminstone väsentlig utsträck- ning undvikes.The object of the present invention is to provide a new and advantageous process for producing a material suitable as a component in suction sintering charges from fine-grained iron oxide material, such as fine-grained iron ore slag, pellet fires, dust from oxygen blowing and other metallurgical intermediates of the material. , by which method the above-mentioned disadvantages are avoided to at least a significant extent.
I nämnda syfte föreslås enligt uppfinningen att blandnhræn av fuktigt finkornigt material och hydrauliskt bindemedel i en sammanlagd mängd av 1-5 viktprocent, räknat som CaO respektive MgO, formas under förtätning, exempelvis genom avsugning på filter, vibrering eller kompaktering, till kakor eller form- kroppar med en storlek, som väsentligt överstiger den önskade maximala kornstorleken i sintergodset, vilka kakor eller form- kroppar, efter härdning genom inverkan av det hydrauliska binde- medlet, sönderdelas till bildning av ett förhållandevis grov- kornigt gods med en kornstorlek understigande ca 8 mm, lämp- ligen understigande ca 6 mm.To this end, it is proposed according to the invention that mixed rinses of moist fine-grained material and hydraulic binder in a total amount of 1-5% by weight, calculated as CaO and MgO, respectively, are formed during densification, for example by suction on filters, vibration or compaction, into cakes or molds. bodies with a size which substantially exceeds the desired maximum grain size in the sintered material, which cakes or shaped bodies, after curing by the action of the hydraulic binder, decompose to form a relatively coarse-grained material with a grain size of less than about 8 mm , suitably less than about 6 mm.
För att ytterligare öka godsets hållfasthet kan detta underkastas en värmebehandling, t ex i virvelskikt_ Redan en uppvärmning till 200-300°C har en markant inverkan.To further increase the strength of the goods, this can be subjected to a heat treatment, for example in a vortex layer. Already a heating to 200-300 ° C has a marked effect.
Lämpligaste sätt för framställning och härdning av kakorna eller formkropparna varierar i beroende av ursprungsmaterialets egenskaper och tillbuds stående bindemedels mängd och hmhænfliska egenskaper. Om tillräckliga mängder bindemedel tillsättes, kom- mer detta att fylla porerna i ursprungsmaterialet och vid härd- ningen bilda bindande bryggor mellan kornen, utan att materiakï behöver sammanpressas till högsta densitet. Ett sätt att åstadkomma en styckeformig produkt är att utföra en avsug- ning av blandningen på etttrommelfilter och sönderdela den .Ju-mv ---... f v" 'v---,.. 8008612-7 bildade kakan i stycken, som sedan härdas. Kakbildningen kan också ske genom vibrering.The most suitable methods for producing and curing the cakes or shaped bodies vary depending on the properties of the source material and the amount of binder standing and the properties. If sufficient amounts of binder are added, this will fill the pores in the original material and during curing form binding bridges between the grains, without the material having to be compressed to the highest density. One way of making a piece-shaped product is to perform a suction of the mixture on a drum filter and disintegrate the cake formed into pieces, which 8008612-7 formed into pieces, which The cake can also be formed by vibration.
Ett fördelaktigt sätt att utföra önskad formning av det finkcrniga utgångsmaterialet är att kompaktera det mellan släta eller profilerade, tryckbelastade valsar, varvid på grund av låg porvolym i det kompakterade materialet bindemedelsmängden kan hållas låg. vid kompakteringen bör tillses, att den i utgångs- materialet använda mängden fukt (vatten) så långt möjligt korres- ponderar mot bindemedelsmängden och dess vattenupptagningsför- måga. Dock bör tillses att mängden fukt alltid understiger porvolymen i_de genom kompakteringen bildade kakorna eller krop- parna, så att ingen fri fukt finns på dessas ytor, enär detta skulle försvåra kompakteringen. Vid framställning av kakor ges dessa en förhållandevis ringa tjocklek, exempelvis 4-12 mm, så att desamma härdas tämligen snabbt. Härdningen av kakorna eller formkropparna kan ske på genomsläppliga band eller i staplar eller fickor, vilka kan genomströmmas av varmluft eller varma rökgaser för påskyndande av härdningsförloppet. Sönderdelningen av de härdade kakorna eller formkropparna kan utföras med hjälp av exempelvis käft-, vals- eller slungkross, lämpligen till en största partikelstorlek av 6 mm. Den finkornigaste andelen av materialet kan avsiktas och återföras till kompakteringen, vil- ket emellertid ur sintringssynpunkt i regel är onödigt, men kan vara önskvärt med hänsyn till undvikande av damning vid transpor- ter och hantering. Om det material, som skall kompakteras är för fuktigt, exempelvis när en slig kommer direkt från filter, kan fukten nedbringas genom inblandning av redan kompakterat, genom härdningen kemiskt torkat material. I det fall kompakte- ringen utföres vid sintringsanläggningen kan normalt returgods från denna anläggning tillsättas.An advantageous way of carrying out the desired shaping of the fine starting material is to compact it between smooth or profiled, pressure-loaded rollers, whereby due to the low pore volume in the compacted material the amount of adhesive can be kept low. during compaction, care should be taken that the amount of moisture (water) used in the starting material corresponds as far as possible to the amount of binder and its water uptake capacity. However, care should be taken that the amount of moisture is always less than the pore volume in the cakes or bodies formed by the compaction, so that no free moisture is present on their surfaces, as this would complicate the compaction. When making cakes, these are given a relatively small thickness, for example 4-12 mm, so that they harden fairly quickly. The curing of the cakes or shaped bodies can take place on permeable strips or in stacks or pockets, which can be permeated by hot air or hot flue gases to accelerate the curing process. The disintegration of the hardened cakes or shaped bodies can be carried out by means of, for example, a jaw, roller or sling crusher, suitably to a largest particle size of 6 mm. The finest part of the material can be intended and returned to the compaction, which, however, from a sintering point of view is usually unnecessary, but may be desirable with regard to avoiding dusting during transport and handling. If the material to be compacted is too moist, for example when a sludge comes directly from filters, the moisture can be reduced by mixing in already compacted, chemically dried material by curing. In the event that the compaction is carried out at the sintering plant, return goods from this plant can normally be added.
Som bindemedel vid formning av kakorna eller formkropparna kan utnyttjas sådana, vilka innehåller ämnen som är önskvärda som slaggbildare vid râjärnstillverkningen, företrädesvis ur gruppen bränd eller släckt kalk, bränd eller släckt dolomit, cement, masugnsslagg, basisk slagg från råjärns-och stålfram- ställning, stoft från basiska stålfärskningsprocesser och flyg- aska från kolförbränning. _. _. ...,.__. ....-,-.--.~«--..._-____...,.. __... ...uu soc-a Quzáašffi 8008612-7 För belysning av förfarandet kan följande exempel lämnas: En mycket finkornig SJL kulsinterslig med spec. yta av 1600 cm”/g, innehållande ca. 6 viktprocent fukt och 2,5 viktprocent bränd kalk, kompakterades mellan ett par släta valsar med en diameter av 350 mm under ett tryck mellan valsarna av 750 kg/cm utnyttjad valslängd. K Valskakorna (kaktjocklek ca. 8 mm) fick falla från ett skibord i anslutning till valsarna mot ett bottenplan, ca. 1 m, varvid de sönderbröts till en produkt med 59,6 viktprocent > 5 mm. Efter några dagars härdning i luft avsiktades material- korn > 5 mm och krossades i en käftkross med 5 mm spaltöppning.As binders in the shaping of the cakes or shaped bodies, those which contain substances which are desirable as slag formers in the manufacture of pig iron can be used, preferably from the group of burnt or slaked lime, burnt or slaked dolomite, cement, blast furnace slag, basic slag from pig iron and steel production. dust from basic steel freshening processes and fly ash from coal combustion. _. _. ..., .__. ....-, -.--. ~ «--..._-____..., .. __... ... uu soc-a Quzáašf fi 8008612-7 To illustrate the procedure, the following examples can be given : A very fine-grained SJL ball sintered with spec. surface of 1600 cm ”/ g, containing approx. 6% by weight moisture and 2.5% by weight burnt lime, were compacted between a pair of smooth rollers with a diameter of 350 mm under a pressure between the rollers of 750 kg / cm utilized roll length. K The roller cakes (cake thickness approx. 8 mm) were allowed to fall from a ski table adjacent to the rollers towards a ground level, approx. 1 m, whereby they were broken down into a product with 59.6% by weight> 5 mm. After a few days of curing in air, material grains> 5 mm were intended and crushed in a jaw crusher with a 5 mm gap opening.
Det krossade materialet sammanfördes med det avsiktade materialet, varvid erhölls ett sintergods med följande kornstorleksfördelning: > 5 mm 0,2 viktprocent 5-3 " 27,4 " i 3-1 “ 35,3 " < 1 " 37,1 " Partiklarna var mycket hållfasta och visade sig vara helt vattenfasta. Produkten var mycket lämplig för inblandning i sintercharge och hade sådana hållfasthetsegenskaper, att den var väl lämpad för båt- eller fordonstransport, exempelvis mellan anrikningsverk och sintringsanläggning.The crushed material was combined with the intended material to give a sintered material having the following grain size distribution:> 5 mm 0.2% by weight 5-3 "27.4" in 3-1 "35.3" <1 "37.1" The particles were The product was very suitable for incorporation in sintering charge and had such strength properties that it was well suited for boat or vehicle transport, for example between concentrators and sintering plants.
Vid förfarandet enligt uppfinningen kräves ej valsning eller pressning till någon större hållfasthet hos kakorna eller form- kropparna, utan erforderlig styrka uppnås genom härdningen. Man kan sålunda ej sönderdela kakorna etc. till önskad kornstorleks~ fördelning före härdningen. Det vid förfarandet erforderliga valstrycket är blott ca. en tiondel av det valstryck som erford- ras, där valsningen omedelbart skall ge den erforderliga håll- fastheten, varför vid förfarandet enligt uppfinningen det i många andra fall prohibitiva stora valsslitaget ej uppträder.In the method according to the invention, rolling or pressing to no greater strength of the cakes or shaped bodies is required, but the required strength is achieved by the hardening. Thus, the cakes etc. cannot be disintegrated to the desired grain size distribution before curing. The rolling pressure required in the process is only approx. one tenth of the rolling pressure required, where the rolling must immediately give the required strength, so that in the process according to the invention the in many other cases prohibitively large rolling wear does not occur.
Såsom nämnts, är den erforderliga bíndemedelsmängden dessutgm låg, 1 -' 5 viktprocent, räknat som ingående CaO respektive MgO.As mentioned, the amount of binder required is also low, 1 - '5% by weight, calculated as constituent CaO and MgO, respectively.
Claims (8)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8008612A SE439327B (en) | 1980-12-08 | 1980-12-08 | PROCEDURE FOR THE PREPARATION OF A SUBSTANCE IN SUCCESSION CHARGES |
PCT/SE1981/000353 WO1982002061A1 (en) | 1980-12-08 | 1981-12-04 | The manufacture of a product to be sintered from fine-grain ironoxide material |
BR8109010A BR8109010A (en) | 1980-12-08 | 1981-12-04 | PROCESS FOR MANUFACTURING A PRODUCT THAT IS ADAPTED AS A CONSTITUENT OF SINTERIZATION SINTERIZATION LOADS |
AU7896082A AU7896082A (en) | 1980-12-08 | 1981-12-04 | The manufacture of a product to be sintered from fine-grain ironoxide material |
AU78960/81A AU545430B2 (en) | 1980-12-08 | 1981-12-04 | The manufacture of a product to be sinted from fine-grain iron-oxide material |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8008612A SE439327B (en) | 1980-12-08 | 1980-12-08 | PROCEDURE FOR THE PREPARATION OF A SUBSTANCE IN SUCCESSION CHARGES |
Publications (2)
Publication Number | Publication Date |
---|---|
SE8008612L SE8008612L (en) | 1982-06-09 |
SE439327B true SE439327B (en) | 1985-06-10 |
Family
ID=20342419
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE8008612A SE439327B (en) | 1980-12-08 | 1980-12-08 | PROCEDURE FOR THE PREPARATION OF A SUBSTANCE IN SUCCESSION CHARGES |
Country Status (4)
Country | Link |
---|---|
AU (1) | AU545430B2 (en) |
BR (1) | BR8109010A (en) |
SE (1) | SE439327B (en) |
WO (1) | WO1982002061A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU594003B2 (en) * | 1987-11-20 | 1990-02-22 | Kabushiki Kaisha Kobe Seiko Sho | Self-fluxing pellets to be charged into blast furnace, and method for producing same |
DE102012005454B4 (en) * | 2012-03-20 | 2020-06-18 | Outotec Oyj | Method and device for producing hardened granules from iron-containing particles |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2391588A (en) * | 1945-12-25 | Method of prepaking pellets for | ||
CH242886A (en) * | 1942-06-16 | 1946-06-15 | Budavideki Vasgyar R T | Process for the pretreatment of colloidal sludges containing at least iron oxide as a metal-containing substance for the purpose of their further processing at least on iron. |
DE1029568B (en) * | 1955-10-31 | 1958-05-08 | United Steel Companies Ltd | Process for the pretreatment of ores, ore concentrates and metal-containing residues to be sintered on grates |
GB853532A (en) * | 1957-12-26 | 1960-11-09 | Andre Subervie | Improvements in and relating to the preparation of ores |
DE1174076B (en) * | 1962-12-10 | 1964-07-16 | E H Hermann Schenck Dr Ing Dr | Process for increasing the performance of sintering plants |
SE304767B (en) * | 1966-05-17 | 1968-10-07 | Boliden Ab | |
SE353742B (en) * | 1966-07-22 | 1973-02-12 | Boliden Ab | |
AT297767B (en) * | 1969-01-30 | 1972-04-10 | Voest Ag | Process for processing a metal oxide-containing, preferably iron-oxide-containing sludge for the subsequent use in sintering plants |
CH534738A (en) * | 1969-06-24 | 1973-03-15 | Wolffjohann Ets | Binder - contg lime-rich lime-silica-alumina, for sinter - granulate prodn from iron ore slimes |
BR7802010A (en) * | 1978-03-31 | 1979-11-20 | Mineracao Brasileiras Reunidas | PROCESS TO TRANSFORM FINE IRON ORE OR MANGANES OF GRANULOMETRY LESS THAN 150 MICRA IN RAW MATERIAL FOR SINTERIZATION THROUGH AGGLOMERATION AND CURING AT LOWER TEMPERATURES AT 300GRAD C |
WO1981003499A1 (en) * | 1980-06-05 | 1981-12-10 | Ssab Division Gruvor | Agglomerates,a process for producing thereof and use thereof |
-
1980
- 1980-12-08 SE SE8008612A patent/SE439327B/en not_active IP Right Cessation
-
1981
- 1981-12-04 WO PCT/SE1981/000353 patent/WO1982002061A1/en unknown
- 1981-12-04 AU AU78960/81A patent/AU545430B2/en not_active Ceased
- 1981-12-04 BR BR8109010A patent/BR8109010A/en unknown
Also Published As
Publication number | Publication date |
---|---|
SE8008612L (en) | 1982-06-09 |
BR8109010A (en) | 1983-04-12 |
AU545430B2 (en) | 1985-07-11 |
WO1982002061A1 (en) | 1982-06-24 |
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