Leaching of synthetic scheelite by hydrochloric acid without the formation of tungstic acid

• Tipo: Artigo em Revista Científica Internacional
• Data: 2003

Autores

José Inácio Martins (Autor) FEUP; Moreira, A (Autor) Outra; Costa, SC (Autor) Outra

Revista

Título: Hydrometallurgy

Vol. 70

Páginas: 131-141

ISSN: 0304-386X

Editora: Elsevier

Indexação

ISI Web of Knowledge - 26 Citações

ISI Web of Science

Scopus - 37 Citações

Outras Informações

ID Authenticus: P-000-G2V

DOI: 10.1016/s0304-386x(03)00053-7

Abstract (EN): The kinetics of the leaching reaction of synthetic scheelite with hydrochloric acid was studied to determine the effect of pH and temperature in the formation of tungstic acid. Conversion data obtained from leaching in a temperature range of 28 - 100 degreesC and pH between 1.5 and 3.0 are interpreted in terms of the predominating tungsten species present in the leaching liquors. The results show that it is possible to digest the synthetic scheelite in the acidic hydrochloric medium without the formation of tungstic acid by monitoring and controlling the pH, and controlling the temperature in the domain of metatungstates. In this case, the experimental results match with the shrinking core model, and show that the solids leaching is kinetically under both chemical and mass transfer control.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 11