Integrated Process for Purification of Low Grade Talc Ores

This study examines the development of an integrated process for separation and purification of low grade talc ores. This procedure involves leaching with HCl to dissolve gangue minerals and to purify a low purity talc ore containing up to 40% gangue minerals. Also, all cations from gangue minerals...

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Published inParticulate science and technology Vol. 32; no. 1; pp. 1 - 7
Main Authors Castillo, Luciana A., Barbosa, Silvia E., Maiza, Pedro, Capiati, Numa J.
Format Journal Article
LanguageEnglish
Published Philadelphia Taylor & Francis Group 02.01.2014
Taylor & Francis Ltd
Subjects
Acid treatment
carbonates
Cations
Chemical precipitation
Chemical reactions
chlorite
Coagulation
Dissolution
Gangue
Hydroxides
Leaching
Minerals
Ores
Purification
recovery
talc
Talcs
Temperature effects
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Summary:This study examines the development of an integrated process for separation and purification of low grade talc ores. This procedure involves leaching with HCl to dissolve gangue minerals and to purify a low purity talc ore containing up to 40% gangue minerals. Also, all cations from gangue minerals are recovered as hydroxides via selective precipitation. The effects of acid concentration, talc/acid solution ratio, time, and reaction temperature on talc purification were studied and the optimal conditions were determined. Laboratory-scale tests revealed that the resulting talc is free of gangue minerals, consisting of small particles with nanometric thicknesses. Reactants are fully consumed during dissolution and byproducts like ammonium chloride could be recirculated and reused. Resulting hydroxides can be used as a coagulation aid for water treatment.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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ISSN:0272-6351
1548-0046
DOI:10.1080/02726351.2012.755588