Process For Treating A Material

Abstract: A process for treating a material to remove sulphates or other impurities therefrom comprises a) subjecting the material to a leaching step to selectively dissolve sulphate-containing material or dissolve other impurities from the material and/or to passivate gypsum, b) separating a leach solution generated in step (a) from solids, and c) treating the solids from step (b). The solids from step (b) may be leached to dissolve Si and/or Al and the pregnant leach solution can be treated to precipitate zeolites. The process can be used to make zeolites from feed materials, including leached spodumene residue. Step (a) is a pre-wash/pre-leach step that removes impurities that could otherwise interfere with the zeolite precipitation step or require further processing of the pregnant leach liquor.

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