Journal
HYDROMETALLURGY
Volume 95, Issue 3-4, Pages 341-345Publisher
ELSEVIER
DOI: 10.1016/j.hydromet.2008.04.011
Keywords
Selective leaching; Phosphate rock up-grade; Acetic acid; Carbonate minerals; Kinetics
Categories
Ask authors/readers for more resources
The selective leaching of a low-grade calcareous phosphate rock using acetic acid was investigated. it was found that the leaching rate of the carbonate material increased with increasing the acid concentration, temperature, reaction time and decreasing pulp density. A shrinking core first-order kinetics model is presented to describe the dissolution and to analyse the data. The activation energy for leaching was found to be 41.0 kJ/mol and consequently, the rate of the reaction based on a reaction-controlled process could be expressed as 1 - (1 - alpha)(1/3)=3.68x10(4) e(-41.0/RT)t. Depending on the leaching conditions, it was found that the P2O5 content could be upgraded to 32.1%, with recovery of about 81%. Therefore, it is possible to produce a phosphate concentrate from low-grade calcareous phosphate, using this leaching approach. (C) 2008 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available