Bacterial leaching of two Swedish zinc sulfide ores

Autor:	Roll O. Hallberg, Christopher Krafft
Rok vydání:	1993
Předmět:	Metallurgy chemistry.chemical_element Zinc Phosphate Microbiology Zinc sulfide Grain size chemistry.chemical_compound Ammonia Infectious Diseases chemistry Bioleaching Ammonium Leaching (metallurgy) Nuclear chemistry
Zdroj:	FEMS Microbiology Reviews. 11:121-127
ISSN:	1574-6976 0168-6445
DOI:	10.1111/j.1574-6976.1993.tb00275.x
Popis:	Two Swedish zinc sulfide ores, from Saxberget (S-ore) and Kristineberg (K-ore), respectively, were compared for bacterial leachability with respect to grain size, and additions of ammonia, iron and phosphate. 87 days of column leaching resulted in 2.4–3.2 g Zn/I in solution and 1.5–1.9 g Cu/I from the K-ore and 1.2–5.3 g Zn/l and 0–0.3 g Cu/l from the S-ore. The highest values were achieved for grain sizes between 16 and 64 mm. Ammonium showed a stimulating effect on bacterial leaching, increasing leached Zn in the K-ore from 27% to 35% and from 7% up to 70% Zn in the S-ore after 53 days of batch leaching. Phosphate additions showed negative effects. Iron additions had a positive effect for the K-ore, increasing the leaching from 48% to 78% Zn at an addition of 6 mg Fe2+.
Databáze:	OpenAIRE
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