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Abstract
Jarosites are known to be potential compounds for the Fe(III), SO4 2− and impurities control in hydrometallurgical processes. Due to inherent association of Na, K, Fe, Al with the oxidic and sulphidic ores, these metal ions dissolve during sulphuric acid leaching and subsequently reprecipitate as varieties of ferric hydroxysulphates. The formation of jarosites is favoured in the temperature range of 80- 100°C and pH < 2.5. The presence of mono- and tri-valent cations and suitable counter anions such as sulphate, arsenate, phosphate, silicates etc. stabilise these compounds even at very high acid concentration and temperature >200°C. In this paper, various aspects related to jarosites are briefly reviewed emphasising mineralogy, structure, precipitation, formation at elevated temperatures, stability and utilization.
