A PROCESS FOR RECOVERING INORGANIC MATERIAL FROM DEINKING SLUDGE

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 d...

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Bibliographische Detailangaben
Hauptverfasser:	DAHLIN, JOERGEN, SUNDKVIST, ARNE, AELMQVIST, ARNOLD, MATTSSON, ERIK, DAHLBLOM, BORIS, LARSSON, MATS, ERIK
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	APPARATUS THEREFOR BEER BIOCHEMISTRY CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY ENZYMOLOGY IMPREGNATING OR COATING OF PAPER METALLURGY METHODS OF PRODUCING PAPER THEREON MICROBIOLOGY MUTATION OR GENETIC ENGINEERING PAPER NOT OTHERWISE PROVIDED FOR PAPER-MAKING PAPER-MAKING MACHINES PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D PRODUCTION OF CELLULOSE PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS PULP COMPOSITIONS REGENERATION OF PULPING LIQUORS SPIRITS TEXTILES THEIR RELEVANT APPARATUS TRANSPORTING TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE VINEGAR WINE
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Beschreibung
Zusammenfassung:	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.