Removing Organic Impurities from Bayer Process Liquors
AssigneeVery Small Particle Company Pty Ltd
InventorsJose Antonio Alarco, Peter Cade Talbot
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Abstract
A process for treating a Bayer liquor by wet oxidation to oxidise organic contaminants in the Bayer liquor in which the wet oxidation process is conducted in the presence of a mixed Ce/Mn oxide. The catalyst may have nano-sized grains, and be supported on a mesoporous oxide support. The catalyst may also contain a platinum group metal.
Claims27
A process for treating a Bayer liquor by wet oxidation to oxidise organic components in the Bayer liquor, characterised in that the wet oxidation process is conducted in the presence of a catalyst comprising a mixed Ce/Mn oxide.
A process as claimed in any one of the preceding claims wherein the catalyst includes one or more platinum group metals.
A process as claimed in any one of the preceding claims wherein the catalyst has nano sized grains.
A process as claimed in any one of the preceding claims wherein the catalyst is provided in the form of particles of the Ce/Mn oxide.
A process as claimed in any one of the preceding claims wherein the catalyst has pores size in the range of from 5 to 250 nm.
A process as claimed in any one of the preceding claims wherein the wet oxidation treatment step is used to treat spent liquor from a sedimentation step or a precipitation step in the Bayer process.
A process as claimed in any one of the preceding claims wherein the wet oxidation treatment step is conducted at a temperature of from 200 to 315° C. and at a pressure of from 1 to 10 Mpa.
A wet oxidation catalyst used in a wet oxidation treatment of Bayer process liquors, the wet oxidation catalyst comprising a mixed Ce/Mn oxide material.
Dependencies are inferred from the claim text.