PROCESS FOR REDUCING THE AMOUNT OF CALCIUM CONTAINED IN SODIUM-BASE WASTE SULFITE LIQUOR HE USE OF A SODIUM AND/OR AN AMMONIUM COMPOUND AND ADDITIONAL CALCIUM

The amount of calcium contained in sodium-base waste sulfite liquor is reduced by precipitating the calcium as calcium sulfite and separating the precipitate from the remaining waste sulfite liquor solution. The precipitation is caused by dissolving in the waste suflite liquor (1) additional calcium...

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Bibliographic Details
Main Authors STARK, WILLIAM H, SETHI, BAL K, LAHTVEE, TOIVO
Format Patent
LanguageEnglish
Published 20.09.1977
Subjects
APPARATUS THEREFOR
PAPER-MAKING
PRODUCTION OF CELLULOSE
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS
REGENERATION OF PULPING LIQUORS
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Summary:The amount of calcium contained in sodium-base waste sulfite liquor is reduced by precipitating the calcium as calcium sulfite and separating the precipitate from the remaining waste sulfite liquor solution. The precipitation is caused by dissolving in the waste suflite liquor (1) additional calcium, i.e., beyond the amount of calcium initially contained in the waste sulfite liquor; (2) a sodium or an ammonium compound or a combination thereof selected from the group consisting of sodium oxide, sodium sulfite, sodium carbonate, sodium bisulfite, sodium hydroxide, anhydrous ammonia, ammonium sulfite, aqueous ammonia, ammonium carbonate, ammonium magnesium carbonate and ammonium hydroxide; and (3) a source of sulfite ions.
Bibliography:Application Number: CA19740197682