Abstract
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 − α) 1/3 = 3.68 × 10 4 e − 41.0/RT t. Depending on the leaching conditions, it was found that the P 2O 5 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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
