Process for slow softening water
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United States of America Patent
Stats
-
Jun 24, 1980
Issued Date -
N/A
app pub date -
Sep 18, 1978
filing date -
Jan 14, 1975
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Water having calcium compounds therein is softened by admixing an alkaline precipitating agent and finely divided crystalline calcium carbonate therewith in a mixing zone prior to the addition of a flocculating agent containing trivalent metal ions whereupon the calcium compounds are then changed inside a reaction zone into calcium carbonate. At least a part of the calcium carbonate newly precipitated from the water in the reaction zone prior to addition of the flocculation agent is immediately withdrawn and recycled to the mixing zone.
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- Non-US Classification not provided for expired patents
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