HUE034189T2 - Mixture, use of this mixture as well as method for conditioning a slag on molten metal from the processing of iron and steel in a metallurgical vessel - Google Patents

Description

ylxfure, us® of tills :mî:x$are, ged for ou edit.iga la g a slag Ige at ed ou g mutai malt la g aietallariícpl y.mml in trog %%à steal tgelallargy

The invention rehuos lo y mixture to de introduced into the sieg located on & metil melt ifi írón. dad steel Meialiitrgy. the use of mmh a miMure, and a rue th nd Toe conditioning a slag lue a ted ou a tu et al melt Jo g; metellurgieaj vessel, t'or exempte lu a ceaverier, ip au eleetrie are tarnacm or |g g ladle, la iron and steel metallurgy. in steel ami iron metallurgy the pig iron melt is separated from uudesired ionelit u e n i & b e I o .r e e a s t i n g,

If a converter Is used then tn the ease of the i.D method, which Is currently the most wmeapread, oxygen is blown for lies purpose b> means of a lance onto the pig iron melt located in a converter lined with an alkaline refractory material. The process of this blowing of oxygen onto the pig iron melt is also referred to as refining. During refining, iron comami.nn.rma ist particular Iron contaminants 1st the form of carbon., manganese, silicon and phosphorous, are oxidised by the oxygen. Mown In arid lagather with added burnt lime form a slag layer floating ap the metál luelt, in an electric are furnace the crude steel melt is produced by melting scrap metal, pig iron, liquid iron and/or direct reduced iron ami other raw materials. Once the metal melt refined in the primary metallurgical apparatus has the desired properties this is tapped through the tapping channel intd the ladle for secondary rout a 11: or g le a! treatment.

The slag tons? be selectively influenced >..·r conditioned with regard to chemical and physical properties. lg érdét to dôMltMil tha slag it Ts known to gyp vide the slog with, wtiai are known as slag conditioners in order to he a hip to chagge the properties of the slag. fhe basicity. i c tbe muss os molar ratio of tbc alkaline components îo the other components of the slag t which for example can be calculated in aCí. otd<u*ev 'Xitb the lotlowmc. tonoul.s \t ko * ' MgOl fxdidC · Ahfu^Dtrthe! sMáiponentsj). of the hűti al ly acidic nr notvalkalrne slag must ihereíore be tneteused in nicer to tednee ibe corrosive attack of tlx slog on tbc uikahtn-lining of the metallurgical vessel in which the metal melt Is located and tints Mtenaate the croslol of the lining thd fncreMe tbc service life thereof l'<>r this teáson, slag conditioners have a component increasing the bastcuy ol the slag,ibis epmppnbnf fn partkular being lime. dolomite lime, or dolomitéit m additionally espehscru to adhwt the content of Mk> in the slag b% addition of a slag conditioner, such that it lies ist a range of saturation b! m the dag and a \ orrom«. attack ol thr slag ou On hnmg m "ho-alt emut led.

It now also be desirable when tapping or folio wing tapping to J|ft: cas.dv apply Id" slag renmmmg at the converter following the tapping to the refractory Itning of tbe converter. Due to this applied slag layer, a corrosive? attack of a metal melt on the lining of the converter can be reduced, The process of appipng :the slag tothe converter is a!« referred; |u as '‘maintaining” the converter. The known methods for maintaining hue Ctum ml et on the one hand include vs he! is known as “slag washing", m 'Ληΐί ' the skf ts distributed over the tapping« and charging side by pi voting the converter. A further maintaining method is what is known as “slag splashing . sn which the 11 a§ is meehptieaib spiav^# with the aid of a nitrogen gas tlow 0j-jj lance. Lastly. In tbe ease of what b known as ’"’slug foaming”, slag ss chcnwcally foamed by adding a carbon carrier. The slag foamed in the case or i,' e man a no is also xlmed to x 'Ioann, d -dee" liostdes ibld'Äfbflhining of the converter by means of the foamed slag, this ;&amp;«$’ftÄf.:riia|s-antageons effects. The foamed slag has i»isolating ptepvtt*es. such tb tt tlx h' u losses fmm rhe n elt van "w tenanted and energy Abb fee Myed. Furthermore, components .if tbe memflinriipul: veggoi % which the iron it,#!* ί«ΜΛί*Ιίρ;%pmttliiÄhi':Ä ftSáited slag against::, heat radiation. in order to generate a foamed slag in an electric are samove, carbon blown into the slag is additional}) burned by means of oxygen to form carbon tttotmxlde, and the carbon monoxide gas necessary for foaming Is provided id uns wax. la the cow of the e.eitmg process in an clevltw. are furnace, a foaming of the slag layer is of importance, since this shields the light art by means of a volume Increase, attenuates radiation losses at the furnace wall, improves the energy transfer to the melt, a ad'itató likewise saved edufgw In order to Increase the reactivity of the slag conditioner when introduced 1¾'if -desirable in principle to providg; the mixture so us ip be as tine'grained as possible and to introduce it mto the slag tn this state, It. is therefore known to provide slag conditioners in the form of a fine dust, such that they have a htgh reactivity on account of their high specific surface area. However, a disadvantage of such slag conditioners provided in the form of a fine dust Is in particular the complicated handling of such a slag conditioner in the form of a fine dust. It is therefore known from die prior art to compact a slag conditioner in the form of a fine dust firstly into pellets: and ίο ή o'duee sa‘",i vendstvwo la ho\ hum ars *h slag. However, a disadvantage of sue It slag erndiuonets pressed into pellets mas be that they disintegrate tn the slag only with a time de lax, and the icaehwty oi the ol tg conditioner is thus reduced.

On this basis, one object uf the iaxentmn is to provide a slag conditioner b> means of which the basicity and the MgO content of the slag tan be quickly increased in ordM tg he able to seduce the attack of the slag of lining of the meinUnretcal xesset in which the metal me It is located with the slag located thereon, Λ further object of the inveniiun lies in pros who g a slag enndwnme; that ha; a high reactivity and at the same time can be easily handled. A further object of the intern ion ! ΐ ^ s m providing a «lag conditioner by means of which a inamra g of the slag con be achieved.

Last.lv, a nmK't on cot ot o't v.rut rIc> pw x κ1'*η ·λ * <i$ oo '<Tl, r ; by BteAps#T which an increase of the iron output of the primary metallurgical procèss can bo achieved. .1¾ nrier to achieve these objects, a mixture or a slag conditioner to be introduced into the slag located on a. metal melt in won and steed metallurgy is provided la accordance with the invention, said mixture or slag conditioner comprising the -'olhnsnu.1 components in the following mess psepimioiw' sow dolomite in a range from 10 to 90 mass Tf; one or more further components comprising at least the following constituents'. fVlgO and carbon, in a range from 90 to 10 mass %; as well ad the further features according to chum !.

The mixture according to the invention or the slag conditioner according to the invention is suitable lor introduction into slags on metui melts in anv metallurgical vessel, hut in particular for slags·£&amp; converters, ijkctrtc arc furnaces, and lad lee. A.n ol the values specified herein in % are values in mass %*. in each ease in rotation to the loinl mass of the mixture according to the invention, unless specified otherwise *« individual a mm she proportion ot raw dolomite in the mixture according tu the invention, which m accordance with the invention lies in a range from 10 to 90 muss %, oa panwusm peitnrms two Let tasf^ m in cordanee with the u;x ention, Ott the One mind the taxx uuiomite is heated suddenly upon contact with the hot slag,, s. hereby a taw »nation ot the raw dolomite is initiated. This calculation leads to a naatning ol t.ne slag, such thru, when the mixture according to the location is souodoeed into the slag, a foamed slag is formed. On the other hatto, how,ex et. dte vákuumon of the raw dolomite upon introduction of tin.· mimm·. him the slag also causes the mixture, insofar as ÉÍS ilt #b- the tuim ol pellets into the x;ag, ΙΑ spontaneously disintegrate, the mixture 'hw' terming ; U"go epm ικ ttoa vntk ,< h\e,lt tenet*', m I be mixture .wv-'-.d.ng to tit,' mw ntion tints μ\λ it po-wsog f-o mtid oimnoe to be provided simultaneously both, in the form of pellets, Ue. with good handling, and with 0 high reactivity. ^'.te to tin préparant >< ot MgO and t'.tO Fontsei from the nto do ornate: toi,owing e.u.Jnasion thucof. the basicity of the slag ts ioeteased t urthermore. doe to the proportion of MgO formed following es kan et son of .he : 'W Λ lourde on MgO s nur ado*' of .he s eg 5¾ .reh,e\eo, stwh that the corrosive attack of the slag on the refractory lining of the roetallitrgse. I reO'Cl hokiu'g the soot,a seek w reduced Here, 0 futthes aux ant.ege ot · n. osxutto *> emdtng to the ones Hon in pedicular *s tint the' MgO saturation can. be achieved porta:-Hark quicklv on account of the high feactiv Sts of the mixture'.

Besides raw do ! omise, the mixture accord ing to the inyontiös also compris os Óhp px more further.....components comprising MgO and carbon. i he proportion of carbon in the further component serves to intensify the reaming of the slag when the mixture is introduced into said slag. Herrn when the mixture is added to the slag, the carbon reacts with oxygen located m the Beg to form carbon oxides, in particular to form carbon monoxide (CO) and carbon dioxide sCOn. When the mixture is introduced into the slag, the vurhon m the Bother coinp^nent oxidises iotmoJUatelx and fitt eels wo'h oxygen proport tone of the slag, such that the slag foams up spontánénak) when the mixture is introduced into tin slag.

Both dite to the calcination of the raw dolomite upon introduction into a slag dpi due to the reaction of the carbon proportion of the mixture upon introduction into the slag, a foaming of the slag is therefore provoked, whereby the slag, as in the case of slag foaming, increases in height ami coders she refractor', luting of the metallurgists tesset Ht an electric ,ό k' i.u'J\ 'iif.is' ot te ke%,UK ate . s k' . Id* t pad dh > < tmpkv \ with respect to the furnace wall as a resuit of the Increased volume of the

*0 ,t"' d stag lOtC ív' O', tWWamb OOtivOHÎ oi Mg*>, fllC d n, O tllC SC SUC t U'U obtains the îscccN\ay \ \ -<,-y >5¾ ordex to dso remain <ulhí.-txd to the wall <1 úri π g ami after the foam mg.

If the mixture comes into direct contact with the metai melt, for example hmuose v ,trr'\cb through a rinser at aft. opening irt the slag layer, the cat bon in the mixture may react directly with oxygen of the mete! melt ait tap remove oxygen from the metal melt. This oxygen removed front the metal m ,i must not later ho temoxeo to * gw iter extent ho no the metal mHt ?n additional steps by deoxidising agents, for example aluminium·. Aï least some of the oxygen with which the carbon from lie nrixtbre according to the invention introduced into the slag reacts originates fro to iron oxides Itt the slag that are reduced in the carbon to form metallic iron The output of recovered iron in the oxeraU process thus i no ; cosed Αχό ό die pvO'O'Uon ol vainer n ne ou store, i 1o mun t the slug can thus he achieved on the Pit©· komi. do -ëirôpfti of fecovered iron in the overall process can he increased

The proportion of MgO ol the ''orther >. cm eceten t,-, senes ín partiul, tt to be able to selectively adjust the haswtn and the MgO saturation of the slag depending on the other components of the mixture.

The component ol the mixture m the form of raw dohimlte Is raw, i.m nálam! in partienlar pncaMned dolomite. Raw dolomite, &amp;§;|s known:, is a rock containing the primary mineral dolomite f CaMgtCO^gmr CaCOs * MgCO-Ov Raw dolomite reguláris eontjurm dolomite to ah : extent of at least vO mass tn relation to the raw dolomite In addition, natunaf impurities may of course: be present, for example.....to ir e Ο! Λ1.Ό;, in accordance xxtth the invention a ru\s dolomite huviug a proportion of dolomite of at least 90 mass %, in relation to the raw dolomite In gMCictdar basing at least 91, 92, 93. 94, 9$ or 96 % dolomite, is preferable nseif,

Raw dofoitlie may be present in the mixture according ίο the invention in a "lopoun-n ο * : iiu\' t'i to '0 u A; r\o^ . * *. lot example a*v>> t > a ow-porti-m <w ,P sénat 10 ! s, id, Β, Μ ot Μ muss ·*,. Bn w.t\ ofexntnple >aw dolomite may be present In the mixture according to the invention ist a proportion of an most 90, 80, /0, 60, 55, 50, 45, 40, 35, .30 or '35 moss %. the at least one further component comprised b> the uuMtue hősit s raw: dolomite may he, tor example, one or nuox el î'te following components-mumtK magnesuo, mupnes' Ον,,καο s ' intend megiu m , fas^d nx.g wm s gfipliite. coke, or one or more carbides, for example aluminium cnroide, y one or more of the aforemepiipned components comprising MgO, hoi no cat Hon is present in the mixture accoubng to the invention imkH as eopstie magnesite, sintered magnesia or fused magnesia), at least one further component that comprises carbon is also present (for example a? least one of the <..ornponems magnesia-carbon, graphite, coke or at least one carbide) Accordingly, if one <>r more of the. aforementioned components comprising carbon, but no MgO tsuch as graphite, coke or at least one carbide) isuxre present, the mixture also contains at least one further of the aforementioned components comprising MgO {stub as caustic magnesite, sintered magnesia ot fused magnesia), ip aeeorinpep with aembodiment the further components are present in the form o f m a g a es i a- ear ho n and optionally at least in the form of one of the further a Tore menti oped components.

Id: a particularly preferred embodiment, the further component is present in the form of magnesia-carbon and in the form of caustic magnesite. Magnesia-carbon constitutes what are known as magnesia-carbon products, which are also referred to as magnesia-carbon bricks or MgO-C bricks and are eiuraelerised by gratia formed from magnesia lMg0) and iniereopnected via a carbon hood In accordance with a patP.euiath ptefcsied ombudsmen' mag us. sm-earbon is present in the form of used magnesia-carbon product*, - e what is known as broken-off magnesia-carbon, Such broken-off magnesia- carbon cmv-'UuuuVmagnesia vati'v»' ινoou«.'n % vO* how bot.*?' usto in -me >\i industry-, in particularns inner linings «I b«s*r oxygen furnace converters, sm electric arc furnaces. or in ladies, in fbm respect, correspondingly recycled m. gties’a ooimm moduem cm K p’0«*nt paiticUt, lut geh ot eveinstich as nwguu.s m.~e.irho« in t'w mixture according u* mo in'scuti an. in this lespect. ' ins votioa éhe* itla*,- *<' + Ιό , o* u ι' h' KI mugi* s o one t >' * raw malarial fc>; the «mime according to the inwntum and die use of ''«oh recycled magnesia-carbon products #a component oila ^laíg·cröalittetíéir aueoiding to the invention It bas bee» fontul in accordance with the invention that the use of magnesia-carbon as carbon carrier in the mixture according to the invention may be particularly advantageous, in particular insofar as magnesia-carbon, in particular if present in iroken-'off form, can be approximated to the composition of the refractoty-Jiningvof a -tuelsUurgica! no«;*«' reme* and t*' -wtt e. whw ai.n tug a fo tmeJ slug, rtas contnbute m vs particular!V tffoeths manner to the m nut,on ng of the lining by the foamed: slag.

Ommtie magnesia is eau-tuall} burned magnesite, which is sometimes also referred to as caustic magnesite or caustic magnesia. Caustic magnesite is obtained, as is known, by caustic firing of magnesite CMgt'Gr). i.e. by firing magnesite at low temperatures. An advantage of the use of caustic magnesite iu the mixture according to the invention is in particular the fact that it is highly rsmotive, which m why MgO, when introduced u v»> ., slug t. m 'n released pa*tioulai!} quickly anu the increase of ihe husiéit) of the slue and also the vdgO saturation tneieof therefore can be achieved particular!',' quickly .

Ir has now been I nanlf in accordance with the invention that the mixture according to the ΐηνρηίίοη has particularly advantageous' properties, in puUicuiur with regard t-; ils re.nitnh;, und -'fíicacy as an agent for foaming I s xhg if iK mvlmv ompnsus ne t> iLwi components in the form ot magnesia-carbon and caustic magnesite in the following mass proportions: nmg uma-earbon. 10 to 50 muss *«; eansto magnesite: )0 to *0 mass 4* Hero, in aceorchmco oOh the invention. it is sis« possible that only one of the afmementioned component,". t\ present in the mixture in the aforementioned mass proportions.

Magnesia-carbon .may k present in Ite mixture for example la proporifoni;: of at less) 10, 15, 20, 25, 30 or 35 taofo%. Furthermore, be present in the mixture lot example in proportions of at most 45 or 40 mass %*

Caustic magnesite may he present m the raixturtdfe# -^fmple in pro portions of et least 10, 1 5, 20, 25. 30 or 25 mess bä. F a r t h e r m o r o, c a u s t i e magnesite may he present in the mixture lot example in proportions of at most 50 or 45 mass %.

The mixture, is preferably present in a relatively low grain size, for example in a grain sue less than S mm to an extent of at least 50 mass %, 60 mass %< TO mass: Ms, M mfâMvtfg Mump also TOO tnsss %*. 0} any of example, raw dolomite may he present m a grain sire less than N mm to un extent oi u lets) 80 mass %, Le, for example also to an extent of at least 00 mass % or 100 mass 4¾.

The forth er components. in particular 1 f present in the f«Iat -«if Ägöisia* ..arbors end caustic magnesite, may preferably be present 4h n grain xinf less than 1 nun to an extent of at least 80 mass %, Le. for example also at least: 00 muss % or .100 muss 54.

Since the mixture according in the invention has this very small mean grain s V a canna a»h go» t a sd « > tfo» " o s >ut»o i and partienlarly also a gnu h .hs^^loî wa ot the nuxuo, In Mu L.ee * an be achieved In order to be able to achieve good handling ol the mi címe according to the invention in spite of this small grain sire pi the: afoMPffo the mixtttfe mfy he provided in compacted or pressed form, for example fo the form of pelletl. IP order to provide the mixture in the foim of pellets, it can be provided that a mixture accord!eg to the invention, which in pm Ocular may have the I K'vSHs X vH « Kx* V 0 ^ \ s . vt'fotMOU ' »« bx ptX><vod IOÎO rvlo »<, XX TîïOUÏ aüdtï'OU Ot additiXCS.

By veay of example, these Ä':#ÄÄsl^h8peds rod-shaped.·« spherical form, for example with a»:P!l»t l ength of for ««|teiO ffi®s lit: mm, or .30 mm. The pellets may all®: lay® ®;C^r example of 5, 10, 15, 20, or 25 mm. Pellets with a corresponding sire cart be x'asiK handled, but at foe same time· are suli small enough thaï the> quulhx Ü'#ilâg following addition thereto, and the advantages of the Ai*ldfof|ií&amp;íá:à|piudS$tnbutfoB according to the invention can materialise there quickly, À- fom on sex! οΝ«\ο, foe -eulenmi ,oo οί the taxv dolomite ηροη. itniicutuction ot the mixture into the slag causes the pellets» ttpon introduetfop: into thx slag, to disintegrate spontaneously and thus a email ;graindte or high 'ni?ró » » o' Ma>o o foe mtxurc xx'th a Ittgh seexohe sutteec uhm mfo accompanying high reactivity dexelop immediately.

The mixture may contain a proportion of magnesium carbonate t MgCCht for example m u range from 5 to 30 muss 'fo i.e. for example also a proportion of at least fo ,-·, 8 or 0 mass V« and for example a proportion of at most 25. 20 or fo mass fo The piopoufou xfo u agoestum osr\'S4. so the mivtuto mux bv .pivarrni |.nefonnsuim,k ot compte'v.I\ a.·' ,» eo i\* nxnt os the mm demente I he ptopot tiun xst eakuum carbonate (CaCO.k in the mixture for example .may Itg xn a range írom o to 35 .mass 8¾. i.e. lor example also at a lux e! of at least h, :/, 8, 0 ot lb maw >« Ullf for ^.v.o'sp e a o at , foyj o ai mum fo fs 2u o.t I 5 ntass «, I be pmomuon ot e.dc'um eafoonute xr fot mfo... n'.ay be .pétiigpredominantK or completely as a constituent of the raw dolomite,

Ilte proportion of magnesia (MgO.t in the mixture for example may lie in a range tfom a0 to 60 mass %, i.e for example also at a lex el of at least 25. 30, Ό, 40 or 4 a mass fo and for example al-m at a Imtl of at most 55 xNr 50 roa'W m 1 he mágnestű fot CNampm max be ptesem in pmnenlat «η the .ompomm'N commuted by magoxma-eafoo» and caustic magnc.vte Cêtiïùà may feg- present Iá. tie mixture ateordlsg to tie mXentiott fér exempte Iá a properties iá a range frost .3 to 15 mass 55, Le, for example also is a proportion of at least 4, 5 or 6 mass V and tor example also su a proportion of at moat 14, 15, 12, r 1 or 10 sms a a %. Carbon may be present in the mixture predomisaaily or ssarpleieiy is tie: epsxpirsest til thé form of rpágséMa-carhop, C alpt sts oxrd# (CaO), xvhfob Ifo example may fee i stro d used is to tie sitxfore as u minor constituent of caustic magnesite, may be present in the mixture for example in proportions in a range from 0 to 40 mass %, he, for example also is ptmportlmm of at leapt 1¾. 10 or I S brass % mrd for exasygle: also Ip proportions of at moat .15, 30, .7.5 or 20 mass %. further substances, for example Si Or, ieH.H AHfH, Hop or P.'Ch, may fee introduced into the mixture as impurities via the components of the mixture. Here, these materials may be present in the mixture in the following proportions for exampley wiereib tie proportions of those sshstasees stay he present In tie mixture ibdlxddeatly· or In any eomfefsatlos in the followibg proportions: biO.;. 0 to Hi mass %, i.e. for example also in proportions of at least 0.5 or I mass ?:f and for exemple lb pro port tons of at most '% Ef 7* i, f* 4, 7 or 2 mass %;

JfofoÇ: 6 to 10 mass %> i,e, for example also in proportiobx of at least1 CL$ or I mass fo and for example in proportions of at most 9, 3. 7, 6, 5, 4„ 3 or 2 mass fo;

AleCb; 0 to 5 mass %, i.e. for example also is proportions of at least 0,5 or I or .1,5 or '2 mass % and for example is proportions of at most 4, 3 or 2.5 moss %;

HvO: 0 to 3 mass %, i.e. for example flap is proportions of at least 0.5 or I mass 1« and for example in proportions of most 2 or ! mass It; fsOs; 0 id 0.3 smss %, ** has is eisidsMë that the mixture may react x<fr·' acnsttiveiv to further components and substances. in this respect, it may :H· lï>;-u Ihe mixture according to the invention, besides components in Use Usrm ot raw mtrgnesite, magnesia-carbon and caustic magnesite, also contains proportions of further components in a proportion less than 10 muss %. · e. bn- example also in a proportion less than- l>, 8, 7, to 5, 4. 3. ~ or I moss %. it may be that the mixture, besides the aforementioned substances MgCXh, e&amp;COs. MgO, C, CaO, SiOi. i'CiO.u AbOs, IbO, PjOs, in particular in the aforementioned mass proportions, also contains further substances only in a pruportlpn: less than It) maps IX Te, for example aiao |tt a proportinnsIbffAitl dl?:Is X to $, 4, 3, 2 or i mass %. in order to provide the mixture according to the invention in the form of pellets Ip noeordance with the inychIlon? tkö:WÍ%inW: i«| be made up with a binder before being pressed Ihto peiliis. By why of example, a sulphate-based bunder mas be piovided. for example art Up com salt solution. The ' o'teeattntton * * 1 pen r. salt m 'he pMur s<, * \o ewon at, ^ , c to e\ tap'd tn a range from 0 I to 0,3 mass %, The mixture may be made op with a proportion of binder in a range from 5 to 15 mass %, in relation to the mixture without the binder.

In order to improve the green strength of the pellets, it can be provided that the mixture «any in addition, otto or more temporal binders, for example one or more of the following temporary binders: glucose, starch, one or more siliead|ased binder or one or more phosphate-based binders. I he invention also reUus to a method ror conditioning a slag located on ,t metal molt in a metallurgical vessel in iron and steel metallurgy, said method comprising the following stepfp 'providing a mixture according to the indention; ntuodiKine the m.v.ute into tbc Teg baca.ed on the me Ob melt in a metallurgical ve.^el -\- de mnbed hen he the mixture thus (.40 also he presided fn? exnnsph·' j e<*mpoeied ot pi cased fórén for ex mirk r, she form of pell via Usss' 1 w- mix ir,< n.p be mixed wah one or mon of the hunk^ desenbt ' hxíre.hx mul then pressed |tyt:o pof kis, in particular having the dimensions described herein.

The "lidmo provided, ho example 01 she Mm of pellets m uuwnluce.l oit» Ihe shit and sinks thereinto, such that kiápfÉiv^iif;n t0 the invention there. àcÂréiâg;::10 the invention is suitable ta principle as a slaa conditioner for slags on a metal melt ta any metallurgical vessel, for example rot nteu' me w 01 evrvo 11 r0. ewetik are exae* ot sidles I he mixture according to the invention is particularly preierubly osud as a slag.

Com 10 h' N tjv «η nem pn h »C'n * » 0 n ».a k.n m h vessel wrrn «n elkelnie itmnp. t e in pattkular with a hmng based on at least one of Um following materials: magnesia n\agoe$in-carbppe Ibteosaor

The invention also relates to the use of a mixture described herein lor conditioning a slag located orf lÄÄl MtíiM In metallurgical vessel in iron and steel metallurgy ken-, the u-ό may he implemented as ddsi.lo.sed herein

All of the features of the invention disclosed herein may b^dpïbtoiid!: ode another axblfrarily individually or its combination.

The invention will be explained in g rearer detail on the basis of the following ptaetieal example.

In the practical example a mixture containing the following components according to Table t was firstly provided.

Table I

Th« used raw dűlöm il« contained a proportion ai doioiBità of otors than: Ε3 mass %. Ια relation to the row dolomite. In particular. AbO.t. repih and $10;; were present as minor constituents.

The component in th o form ofloognesip-earbon was hrokan-oíf material in. the fo ftp, of reeve led magoesiawarbby products:. Besides the primary a on s tit y erst MgÖ. this eoptpoooal also eontaiged S proportion of c arhop of 28 atass %, in relation to the total mass of the components.

The raw do!o.mitc was present to a grain sire less than 5 ntm> and the components magnesiawarbon and eanstie magnesite were present in a grain ssae less than I mm.

The mixture was mixed with TO % hinder in the form of Epsotn aalt solution, in relation io the mass oi the mixture without the binder, and was pressed into almond-shaped pellets having a thickness of approximately 13 mm and a length: of approximately du mpt.

The pellets Wife then dried it approxim.:TteTy .300® Celsius and, once cooh were: provided in this foftp as slag eonditiotter,

Claims (3)

1, Keverék a vas- ès acélmetaiíurgiában egy fémolvadékon található salakba vête bevitelre, amely a következő komponenseket a következő tömeg részarányokban tartalmazza: 11 nyers dolomit 10 - 90 tömeg% tartományban; 1.2 egy vagy több további komponens, amely legalibb i kivetkező áikoti réSleMetlaiáimazza, 1.2.1 Mgöés·: 1.2.2 karbon. 90 10 tdmeg% tartományban; ahol 1.3 a keverék további komponenseket tartalmaz magnézía-karbon és kausztikus magnezit (magnezít-kauszier) komponensek legalább egyikének a formájában a következő tömeg részarányokban; magnézia-karbon; 10 -- 50 tömeg%; feaasztlkiSiniagnezit (magpeÉbkauszter); 10-50 tömeg1!, :M Ez 1, igénypont szenntl keverék, ahol a további komponensek magnézia-karboo is katiezfikus magnezit (magnezrbkabszter) honilpián van jelen;1, Mixture of iron and steel meta-metal for smelting in a molten metal, containing the following components in proportion by weight: 11 crude dolomite in the range of 10-90% by weight; 1.2 one or more additional components that are the most common constituents of the plant, 1.2.1 Mg and 1.2.2 carbon. 90 in a range of 10% by weight; wherein the mixture comprises further components in the form of at least one of magnesium carbon and caustic magnesite (magnesite-caustic) components in the following weight percentages; magnesia-carbon; 10 to 50% by weight; feastatlkiSiniagnezit (magpeEbuckthorn); 10-50% by weight of 1: M This is a mixture of claim 1, wherein the further components are magnesium carboxylate, catechetical magnesite (magnesia cluster) in the homilipus; 0, Az előző igénypontok legalább egyike szerinti keverék, ahol a keverék további komponenseket tartalmaz maghizle-karbon és kansztlkua magnezit (magnezilkauszier) komájában a következő tömeg részarányokban: meinèzia-karbon: 1i - II tömsiP; kiösztikis mágriezit (magnezit-kaoszter): 10 ^ 50 tőmeg% 4> Az előző igénypontok legalább egyike szerinti keverék, amely pelletek formájában van jelen,Mixture according to at least one of the preceding claims, wherein the mixture comprises further components in the maghizle carbon and kanlkua magnesite (magnesilicumier) comma in the following weight proportions: Meinium carbon: 1i-II; spatula magnesite (magnesite-chest): 10 ^ 50% by weight 4> A mixture according to at least one of the preceding claims, in the form of pellets, 5. Eljárás a vas- és acélmetalíurglában egy metallurgiai edényben levő fémolvadékon található salaknak a kondicionálására a következő lépésekkei; 5.1 az előző igénypontok legalább egyike szerinti keveréknek a rendelkezésre áilftása ; 5.2 a keverék bevitele a metallurgiai edényben levő femoívadékon található5. A method of conditioning the slag on a metal molten metal in a metallurgical vessel in a iron and steel tube by the following steps; 5.1 providing a mixture of at least one of the preceding claims; 5.2 the mixture is introduced into the femoral extract in the metallurgical vessel 6, Az 1. 4. Igénypontok legalább egyike szerinti keverék alkalmazása a vas- és acélmetallor|iában egy metallurgiái edéhyhen salaknak a kondicionálására.Use of a mixture according to at least one of Claims 1 to 4 in the iron and steel metal for the conditioning of a metallurgical blunt slag.