Naslov (eng)

A pyro-hydrometallurgical process for the recovery of zinc from jarosite waste

Autor

Conić, Vesna
Božić, Dragana
Avramović, Ljiljana
Trifunović, Vanja
Bugarin, Dejan
Jovanović, Ivana
Janošević, Miloš

Opis (eng)

Abstract: The paper presents a procedure for obtaining Zn from jarosite waste raw material by combining lowtemperature roasting at 530°C and leaching in water with its simultaneous separation from Fe. By lowtemperature roasting, iron was converted from the Fe2(SO4)3 form into Fe2O3, which is insoluble in water and slightly soluble in acid. As zinc sulfate decomposes at 740°C, the zinc remains in the form of ZnSO4, which is easily dissolved in water. In this way, the selectivity of Zn over Fe was achieved. Jarosite is the residue of hot-acid leaching. It is obtained according to the old technology of obtaining zinc. Jarosite with a relatively high content of 4.7% Zn is a technological choice for obtaining products of commercial quality. From the experimental results, by roasting 100g of jarosite for 4 hours at 530°C in electric furnace and leaching the roasted sample in water under the conditions: S:L =1:5, room temperature, time 1h, the leaching degree of 91.97% and 9.60% were obtained for Zn and Fe respectively. By applying the precipitation, using 1MNaOH, on leaching solution, 99.93%Fe is precipitated to the pH=4. Zinc precipitates at a pH > 5.5, so it completely remains in leach solution. Zn in the form of ZnSO4 can be further treated by the electrolysis process in order to obtain pure electrolytic Zn, or by precipitation with Na2CO3 it can be obtained as ZnCO3 concentrate of commercial quality.

Jezik

engleski

Datum

2023

Licenca

© All rights reserved

Predmet

Keywords: jarosite, Zn recovery, low temperature roasting, water leaching, metals selectivity.

Deo kolekcije (1)

o:179

Institut za rudarstvo i metalurgiju Bor