članak: 1 od 1  
Hemijska industrija
2010, vol. 64, br. 4, str. 343-350
jezik rada: srpski
naučni članak
doi:10.2298/HEMIND100312013S

Pasivizacija halkopirita tokom luženja rastvorom sumporne kiseline u prisustvu natrijum-nitrata
aInstitut za tehnologiju nuklearnih i drugih mineralnih sirovina (ITNMS), Beograd
bUniverzitet u Beogradu, Tehnički fakultet u Boru

e-adresa: m.sokic@itnms.ac.rs

Sažetak

U radu su prikazani rezultati ispitivanja luženja halkopiritnog koncentrata rastvorom sumporne kiseline u prisustvu natrijum-nitrata. Izračunate standardne vrednosti Gibsove energije reakcija luženja i analiza E-pH dijagrama stabilnosti potvrdili su mogućnost luženja bakra i železa iz halkopiritnog koncentrata u ispitivanim uslovima. U oksidacionim uslovima pri niskoj vrednosti pH bakar prelazi u rastvor kao Cu2+, a železo kao Fe2+ i Fe3+. Rendgenska difrakciona i termijska analiza (TG/DTA) čvrstih ostataka dobijenih pri različitim uslovima luženja, pokazuju prisustvo halkopirita i elementarnog sumpora, čime je potvrđeno predviđanje da se sulfidni sumpor oksidiše do elementarnog oblika. Skenirajućom elektronskom mikroskopijom (SEM/EDX) utvrđeno je da se nastali sumpor taloži po površini halkopiritnih mineralnih zrna i usporava reakciju u kasnijoj fazi luženja. Taloženjem sumpora dolazi do promene mehanizma procesa iz kinetičkog u difuziono kontrolisani.

Ključne reči

pasivizacija halkopirita; luženje halkopirita; reakciona kinetika

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