Bioleaching process for copper extraction from waste in alkaline and acid medium

Ivica Ristović (Avtor), Darina Štyriaková (Avtor), Iveta Štyriakova (Avtor), Jaroslav Šuba (Avtor), Emilija Širadović (Avtor)

Povzetek

Flotation wastes are becoming a valuable secondary raw material and source of many metals and semimetals worldwide with the possibilities of industrial recycling. The flotation tailings contain oxide and sulfide minerals that have not been sufficiently stabilized and form acidic mine waters, which in turn contaminate groundwater, rivers, and reservoi6sediments. An effective way to recycle these mine wastes is to recover the metals through leaching. While the focus is on acid bioleaching by iron- and sulfur-oxidizing bacteria, alkaline leaching, and the removal of iron- containing surface coatings on sulfide minerals contribute significantly to the overall environmental efficiency of leaching. For this study, static and percolate bioleaching of copper from flotation waste at the Bor copper mine in Serbia was investigated in alkaline and then acidic environments. The aim of the study was to verify the effect of alkaline pH and nutrient stimulation on the bioleaching process and element extraction. A sample was taken from a mine waste site, which was characterized by XRF analyses. The concentration of leached copper was increased when copper oxide minerals dissolved during alkaline bioleaching. The highest copper yield during alkaline bioleaching was achieved after 9 days and reached 67%. The addition of nutrients in acidic medium enhanced the degradation of sulfide minerals and increased Cu recovery to 74%, while Fe and Ag recoveries were not significantly affected. Combined bioleaching with alkaline media and iron- and sulfur-oxidizing bacteria in acidic media should be a good reference for ecological Cu recovery from copper oxide and sulfide wastes.

Ključne besede

baker;alkalno;kislo biološko izpiranje;sekundarne surovine;odprti dostop;copper;alkaline;acidic bioleaching;secondary raw materials;open access;

Podatki

Jezik:	Angleški jezik
Leto izida:	2022
Tipologija:	1.01 - Izvirni znanstveni članek
Organizacija:	ZAG - Zavod za gradbeništvo Slovenije
Založnik:	MDPI AG
UDK:	620.1/.2
COBISS:	97131267
ISSN:	2075-163X
Št. ogledov:	3
Št. prenosov:	1
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Slovenski jezik
Sekundarne ključne besede:	baker;alkalno;kislo biološko izpiranje;sekundarne surovine;odprti dostop;
Komentar vira:	Nasl. z nasl. zaslona; Opis vira z dne 11. 2. 2022;
Strani:	str. 1-14
Letnik:	ǂVol. ǂ12
Zvezek:	ǂno. ǂ1
Čas izdaje:	Jan. 2022
DOI:	10.3390/min12010100
ID:	18809973