Process for slow softening water

Details Process for slow softening water Process for slow softening water

1978-09-18

1980-06-24

Hart, Charles N.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210 53, C02B 120, C02B 122

Patent

active

042093953

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newly precipitated from the water in the reaction zone prior to addition of the flocculation agent is immediately withdrawn and recycled to the mixing zone.

REFERENCES:
patent: 1653272 (1927-12-01), Green et al.
patent: 1984219 (1934-12-01), Krogh-Lund
patent: 2044583 (1936-06-01), Rankin
patent: 2044584 (1936-06-01), Rankin
patent: 2348122 (1944-05-01), Green
patent: 2359748 (1944-10-01), Clemens
patent: 2428418 (1947-10-01), Goetz et al.
patent: 3087889 (1963-04-01), Goudriaan
patent: 3089789 (1963-05-01), Van Note
patent: 3839199 (1974-10-01), Weiss et al.
patent: 4036749 (1977-07-01), Anderson

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