626 KB15 KB200020242014Blečić, DragoljubLalović, MilisavRadović, ŽarkoTadić, Nebojšaštevilka:3letnik:48str. 327-330COBISSID:1054634ISSN:1580-2949URN:URN:NBN:SI:doc-SZ9HEEZYenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijecalcium fluoridekalcijev fluoridmodelslagsžlindreModelling of the sulphide capacity of steelmaking slags| Modeliranje sulfidne kapacitete jeklarskih žlinder|In this paper the influence of the CaF2 amount in steelmaking slags on the CaO and Al2O3 activities is presented. The new analytical model (RMJ) for determining the sulphide capacity was derived. The aim of this model is to adjust and correct some models, according to Tsao, Daffy and Young, that had limitations regarding the presence of CaF2 in the slag. Using the RMJ model, the effect of CaF2 on the sulphide capacity and desulphurisation degree is more precisely defined. Calcium fluoride decreases the negative effect of Al2O3 on the sulphide capacity. For an investigation under production conditions, several types of carbon and low-alloy steels were chosen. The steels used for the analysis of specified process parameters were produced using a mixture of CaF2-CaO and CaO-CaF2-white bauxite (WB) as the flux. For specified cases, the results obtained with the RMJ model as well as with the Young model, were presented. The RMJ model defines correction factors k1(CaF2) and k2(CaF2). It can be seen that the certainty factor of linear dependence is a bit larger in the case of the RMJ model than the one obtained with the Young modelV tem članku je predstavljen vpliv vsebnosti CaF2 v jeklarskih žlindrah na aktivnost CaO in Al2O3. Izpeljan je bil nov analitični model (RMJ) za določanje sulfidne kapacitete. Namen modela je prilagoditev in poprava modelov po Tsaoju, Daffyju in Youngu, ki imajo omejitve glede prisotnosti CaF2 v žlindri. Z uporabo modela RMJ je mogoče bolj natančno opredeliti vpliv CaF2 na sulfidno kapaciteto in stopnjo razžvepljanja. Kalcijev fluorid zmanjša negativni vpliv Al2O3 na sulfidno kapaciteto. Več vrst ogljikovih in malo legiranih jekel je bilo izbranih za industrijski preizkus. Jekla, izbrana za analizo specifičnih procesnih parametrov, so bila izdelana z uporabo mešanice CaF2-CaO in CaO-CaF2-beli boksit (WB) kot talilo. Za določene primere so predstavljeni rezultati RMJ-modela, kot tudi Youngovega modela. RMJ-model določa korekcijske faktorje k1(CaF2) in k2(CaF2). Opazi se, da je faktor zanesljivosti linearne odvisnosti nekoliko večji pri RMJ-modelu v primerjavi z dobljenim pri Youngovem modeluTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije