Process for treating waste paper with hardened water

Details Process for treating waste paper with hardened water Process for treating waste paper with hardened water

1978-11-24

1981-01-06

Kratz, Peter F.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

162 6, 162 38, D21C 502

Patent

active

042434785

ABSTRACT:
Water used in the treatment of waste paper is now commonly re-cycled. Hard water is required for such processes. For maintaining the hardness of the water, the re-cycled water is hardened by dissolving calcium carbonate and carbon dioxide in it, thereby forming calcium bicarbonate. An apparatus for hardening the water comprises a mixing container with inlets for waste water, carbon dioxide, and calcium carbonate, and with outlets for foam, hardened water and undissolved calcium carbonate.

REFERENCES:
patent: 2112562 (1938-03-01), Fisher
patent: 2631922 (1953-03-01), Schur et al.
patent: 3208935 (1965-09-01), Nesbitt
Comprehensive Treatise in Inorganic Chemistry, Mellor, vol. 3, 1922, pp. 826-829, 843.

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