Cobalt sulphateCobalt sulphate is a critical chemical for manufacturing batteryBattery cathodes. CobaltCobalt Blue has developed a flowsheetFlowsheet for refining cobaltCobalt intermediates into high purity cobalt sulphateCobalt sulphate. The process is amenable to simultaneously processingProcessing a wide range of cobaltCobalt intermediates and industrial by-products, including cobaltCobalt-nickelNickel hydroxides, cobaltCobalt-nickel sulphidesNickel sulphide, batteryBattery recycled product (black massBlack mass) and sea nodulesSea nodules. The flowsheetFlowsheet has been tested at pilot scale, with a commercial facility being developed near Perth, Australia. The process does not produce sodium sulphateSodium sulphate waste, which is common to refining operations. The capital and operating costs are lower, due to the use of a crystallisationCrystallization technique using isopropanolIsopropanol, instead of the more conventional evaporative technique employing draft-tube-baffle crystallisers.