Caustic Calcined Magnesite of relative purity, closely controlled activity and particle size can be used to precipitate the hydroxides of metals such as nickel (Ni), cobalt (Co) or uranium (U) from acid leachate solutions of their respective ores. CCM must be able to simultaneously achieve: (a) acceptable metal recovery performance, (b) highest possible % metal in the precipitate, (c) minimum MgO/metal ratio, (d) closely monitored pH range, and (d) low precipitate concentrations of undesirable ore-originating metals.
Grecian Magnesite's natural caustic magnesia grades are being successfully used for such a purpose, exhibiting better performance than other natural CCMs and closely following the performance of costly top-end synthetic grades.
Cobalt Recovery using AK98 VHR and two competition grades
Precipitate purity using AK98 VHR and two competition grades
24 h pH monitoring during a uranium precipitation pilot test using AK98 HR.
Lower grade natural CCMs can also effectively be used for the precipitation of metals and acid neutralization/pH adjustment in preliminary and secondary recovery units as well as wastewater streams. Compared to other neutralization agents, the advantages of CCM include lower sludge volumes and easy filtration, higher neutralization capacity per unit weight, buffering action/better pH control, solubility of Mg salts.
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