Treatment of waste paper
AssigneeECC International Limited
InventorJonathan Stuart Phipps
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Abstract
A process for recovering inorganic material from an effluent suspension produced in the treatment of waste paper. The effluent suspension, in the form of an aqueous suspension containing at least 2% by weight of dry solids, is contacted with an oxygen-containing gas at an elevated temperature, and at an elevated pressure sufficient to keep the water component of the sludge in the liquid phase, for a time sufficient to effect substantially complete oxidation of the organic material in the suspension. The resulting product is dewatered and then resuspended in water, whereafter there is separated from the suspension water containing fine carbon particles in suspension to leave the desired inorganic material.
Claims10
A process for treating an aqueous suspension comprising or obtained from an effluent produced by a paper treatment process, the suspension comprising a mixture of organic material and inorganic particulate material and containing a substantial quantity of carbon particles, the process comprising the steps of (i) contacting the aqueous suspension with an oxygen-containing gas at an elevated temperature wherein the water component of the suspension is substantially maintained in the liquid phase whereby substantial complete oxidation of the organic material in the suspension is effected to leave in the aqueous suspension a grey mixture of particulate materials comprising carbon and inorganic particulate material and (ii) treating the suspension to disperse the mixture of particulate materials therein and (iii) treating the aqueous suspension with the particulate materials therein in a dispersed form to separate the carbon from the inorganic particulate material by a physical particulate solid separation process.
Dependencies are inferred from the claim text.