In this paper it is shown how the ceramic filter media used for the dewatering of iron ore, both hematite and magnetite concentrates, can be regenerated to full initial permeability using oxalic acid washing. However, regeneration of the filter medium might not always be consistent with particle dissolution as this process could have stopped but changes in performance of the filter medium can still be seen. Furthermore, the dissolution of particles could still be ongoing although most of the initial permeability was already restored. Results indicate that changes in pore size distribution explain the increase in permeability. As more pore volume is liberated, so permeability increases, although, such data cannot differentiate between complete and partial blocking of the medium pores.
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