Patent ID: 6787120
Filing Date: 2004-09-07
Classification: C01D,C03C

Abstract:
A process for the removal of burkeite from a salt solution comprising aluminum ions, carbonate ions, fluoride ions, sodium ions, calcium ions, and sulfate ions comprising:adding alkali to a salt solution comprising salts comprising aluminum ions, carbonate ions, fluoride ions, sodium ions, calcium ions, and sulfate ions to form a solution containing alkali soluble compounds; optionally filtering the solution to remove any undissolved solids and to produce a solution essentially free of solids; evaporating excess water from the solution to produce a saturated solution, wherein during the evaporating step the temperature of the solution is between about 50Â° C. and about 150Â° C. and the pressure of the solution is between about 0.2 atmospheres to about 2 atmospheresâ€”has been inserted; precipitating burkeite from the saturated solution; and separating the precipitated burkeite from the saturated solution.