PROCESS FOR RECOVERING AND RECYCLING COMPOUNDS CONTAINED IN EFFLUENTS OF THE DELIGNIFICATION AND BLEACHING IN PULP MILLS

The process consists in : (a) causing the black liquor resulting form a delignification process to undergo one or more anaerobic treatments, (b) evaporating the liquor resulting from the anaerobic treatment, (c) causing the concentrated black liquor to undergo an oxidation treatment, (d) recovering...

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Bibliographische Detailangaben
1. Verfasser:	NARDI, FRANCO
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	APPARATUS THEREFOR CHEMISTRY METALLURGY PAPER-MAKING PRODUCTION OF CELLULOSE PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS REGENERATION OF PULPING LIQUORS TEXTILES TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Beschreibung
Zusammenfassung:	The process consists in : (a) causing the black liquor resulting form a delignification process to undergo one or more anaerobic treatments, (b) evaporating the liquor resulting from the anaerobic treatment, (c) causing the concentrated black liquor to undergo an oxidation treatment, (d) recovering the alkaline sodium salts by means of different solubility, (e) causing the separated alkalis to undergo a decarbonation and (f) recausticizing part of carbonates in sodium hydroxide.