ACID LEACHING OF CHROMITE

Authors
VARDAR E ERIC RH LETOWSKI FK
Citation
E. Vardar et al., ACID LEACHING OF CHROMITE, Minerals engineering, 7(5-6), 1994, pp. 605-617
Citations number
25
Categorie Soggetti
Engineering, Chemical","Metallurgy & Mining",Mineralogy
Journal title
Minerals engineering → ACNP
ISSN journal
08926875
Volume
7
Issue
5-6
Year of publication
1994
Pages
605 - 617
Database
ISI
SICI code
0892-6875(1994)7:5-6<605:ALOC>2.0.ZU;2-Z
Abstract
The kinetics of the chemically controlled reaction between chromite an d sulphuric acid, to form chromium(III) sulphate has been studied in t he temperature range 140-degrees - 210-degrees-C The effect of tempera ture, sulphuric acid concentration and perchloric acid addition on the rate of dissolution of chromium has been studied. Perchloric acid is found to increase the rate of reaction. Increase in sulphuric acid con centration favours the formation of acid insoluble sulphates. The acti vation energy for the reaction is 77 kJ/mol in the temperature range 1 40-degrees - 210-degrees-C and 82 % by weight sulphuric acid concentra tion. A response - surface model in four predictor variables has been described for the dissolution of chromium.