Bibliographic Details
| Title: |
EFFECT OF OLIVINE AS MgO-BEARING FLUX ON LOW- AND HIGH-ALUMINA IRON ORE PELLETS. |
| Alternate Title: |
UTICAJ OLIVINA KAO TOPITELJA NA BAZI MgO NA PELETE GVOZDENE RUDE SA NISKIM I VISOKIM SADRŽAJEM GLINICE. (Bosnian) |
| Authors: |
Umadevi, T., Sah, R. |
| Source: |
Journal of Mining & Metallurgy. Section B: Metallurgy; 2023, Vol. 59 Issue 3, p455-464, 10p |
| Subject Terms: |
IRON ores, OLIVINE, PELLETIZING, MELTING points, OPTICAL microscopes, ANALYTICAL chemistry |
| Abstract (English): |
In the present study, the effect of MgO in the form of olivine flux on low- and high-alumina iron ore pellet mineralogy and pellet quality was studied. Green pellets were prepared by varying the MgO content from 0 to 1.5% with a basicity (CaO/SiO2) of 0.30. The pellets were tested for green pellet properties, cold crushing strength (CCS), and reduction degradation index (RDI) and fired at temperatures between 1300 and 1320 oC. An optical microscope with an image analyzer, SEM-EDS, was used to assess the mineralogical phases present in the pellets and the chemical analysis of the mineralogical phases, respectively. The laboratory tests showed that with increasing MgO addition in both low and high alumina pellets, magnesio-ferrite & silicate melt phases increased and the porosity and hematite phases decreased. The decrease in porosity was due to increase in silicate melt formation from the silica in the olivine. With increasing MgO addition, the CCS value of the pellets increased up to an MgO content of 0.9 to 1.1%. Thereafter, the CCS value of the pellets decreased with increasing MgO addition for both low and high alumina pellets. At an MgO content of 0.9 to 1.1%, the CCS value was higher due to the formation of a low melting point magnesio-ferrite phase, which imparted strength to the pellets. For pellets with an MgO level of >1.1, the RDI was within the control limit for both low- and high-alumina pellets. This may be due to a reduction in the porosity of the pellet and a better distribution of the silicate melt phase. Low-alumina pellets showed better physical and metallurgical properties compared to high-alumina iron ore pellets. [ABSTRACT FROM AUTHOR] |
| Abstract (Bosnian): |
U ovoj studiji proučavan je uticaj MgO u obliku fluksa olivina na mineralogiju peleta sa niskim i visokim sadržajem glinice kao i na kvalitet peleta. Sirovi pelet je pripremljen variranjem sadržaja MgO od 0 do 1,5% sa baznošću (CaO/SiO2) od 0,30. Pelet je testiran na svojstva sirovih peleta, čvrstoću na hladno drobljenje (CCS) i indeks redukcione degradacije (RDI), i pečen je na temperaturama između 1300 i 1320 oC. Optički mikroskop sa analizatorom slike, SEM-EDS, korišćen je za procenu mineraloških faza prisutnih u peletu i hemijsku analizu mineraloških faza, pojedinačno. Laboratorijski testovi su pokazali da se povećanjem dodatka MgO u peletu sa niskim i visokim sadržajem glinice povećavaju faze rasta magnezijumferita i silikata i smanjuju poroznost i hematitne faze. Do smanjenja poroznosti došlo je zbog povećanja formiranja silikatnog rastopa iz silicijum dioksida u olivinu. Sa povećanjem dodatka MgO, CCS vrednost peleta je porasla do sadržaja MgO od 0,9 do 1,1%. Nakon toga, CCS vrednost peleta se smanjila sa povećanjem dodatka MgO kako za pelete sa niskim tako i za one visokim sadržajem glinice. Pri sadržaju MgO od 0,9 do 1,1%, vrednost CCS je bila viša zbog formiranja magnezijum-feritne faze niske tačke topljenja, što je peletu dalo čvrstoću. Za pelet sa nivoom MgO >1,1, RDI je bio unutar kontrolne granice za pelete i sa niskim i sa visokim sadržajem glinice. Do ovoga možda dolazi zbog smanjenja poroznosti peleta i bolje distribucije faze rastapanja silikata. Peleti sa niskim sadržajem glinice su pokazali bolje fizičke i metalurške osobine u poređenju sa peletima sa visokim sadržajem glinice. [ABSTRACT FROM AUTHOR] |
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