A PROCESS FOR RECOVERING INORGANIC MATERIAL FROM DEINKING SLUDGE

WIPO Patent Application WO2002048450

A8

A process for recovering inorganic material from a deinking sludge obtained as reject material in the recovery of recycled fiber from waste paper. In accordance with the invention the process comprises the following steps: (a) the proportion of organic material in the form of fiber material in the deinking sludge is 15-40 % (dry solids content), (b) the water content of the sludge is adjusted so that the dry solids content becomes 10-35 %, step (a) and step (b) being so adapted to each other that the sludge is pumpable, (c) the pressure of the sludge is increased to at least 22 MPa, (d) the temperature is increased to supercritical or near supercritical temperature; (e) a medium containing oxygen is added to the sludge to oxidize all organic material at supercritical temperature and pressure in a reactor, (f) energy released at the oxidation of the organic material is recovered, and (g) the flow of material from which energy has been recovered and which comprises said inorganic material, gases and water, is subjected to material separation for recovery of the inorganic material.

JPS62243783	VACUUM TREATING DEVICE
WO/1999/050472	VACUUM STRIP COATING INSTALLATION
JP2000128829	(METH)ACRYLATE ESTER AND PRODUCTION OF POLYESTER (METH) ACRYLATE

DAHLBLOM BORIS (SE)
DAHLIN JOERGEN (SE)
LARSSON MATS ERIK (SE)
MATTSSON ERIK (SE)
SUNDKVIST ARNE (SE)
AELMQVIST ARNOLD (SE)

PCT/SE2001/002714

October 24, 2002

December 10, 2001

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STORA KOPPARBERGS BERGSLAGS AB (SE)
DAHLBLOM BORIS (SE)
DAHLIN JOERGEN (SE)
LARSSON MATS ERIK (SE)
MATTSSON ERIK (SE)
SUNDKVIST ARNE (SE)
AELMQVIST ARNOLD (SE)

B01J3/00; C12S3/04; C02F11/02; C02F11/08; C02F11/12; D21C5/02; D21F1/66; D21H17/67; (IPC1-7): D21C5/02

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