Leaching Scheelite by hydrochloric acid without the formation of tungstic acid

• Type: Article in International Scientific Journal
• Date: 2003

Authors

José Inácio Martins (Author) FEUP; A. Moreira (Author) Other; S. C. Costa (Author) Other

Journal

Title: Hydrometallurgy

Vol. 70 No. 1-3

Pages: 131-141

ISSN: 0304-386X

Publisher: Elsevier

Indexing

ISI Web of Knowledge

ISI Web of Science

Scopus

Scientific classification

FOS: Engineering and technology > Other engineering and technologies

Other information

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 °C 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. © 2003 Elsevier Science B.V. All rights reserved.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11