Our new way to dissolve ores has made simpler the conventional process for rare earth ores and concentrates.
When sulphuric acid is used to break down phosphate-based ores such as monazite, there are two main acids present:
Sulphuric acid (added as a leaching reagent)
Strong phosphoric acid (from the breakdown of phosphates in the ore)
We have simply removed the sulphuric acid, replacing it with additional strong phosphoric acid, in a simplification of the chemical system.
The initial results of this work have been published after peer review. The process is patent pending under Aust. Pat. App. No. AU/2020/051252.
The new leaching process is a cleaner and effective process.
No toxic sulphurous gases or addition of sulphates to the environment
A less toxic and hazardous acid
Ability to regenerate and recycle the acid
Novel leaching process: coarse monazite sand dissolved within 30 minutes, enabling smaller equipment
Conventional process: finely ground monazite broken down over multiple hours
A simpler downstream process