C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 1/56 (2006.01) C02F 1/52 (2006.01) C02F 1/54 (2006.01) C09D 7/00 (2006.01)
Patent
CA 2069527
C-1538 TITLE OF THE INVENTION "IMPROVED METHOD FOR REMOVING SOLIDS FROM SYSTEMS CONTAINING WATER-BASED PAINTS" ABSTRACT OF THE DISCLOSURE Methods of treating circulating water containing over-sprayed, water-borne paint, alone or in combination with over-sprayed solvent-borne paint, as in a paint spray booth operation, comprise maintaining the alkalinity of the paint spray booth water between about 50 and 2000 ppm, on a calcium carbonate basis, by adding an alkalinity source thereto, maintaining the pH between about 6.0 and 9.0, adding a melamine polymer to the water, adding an aluminum salt to the water, contacting the over-sprayed paints with the alkalinity-adjusted paint spray booth water before or after addition of the melamine polymer and aluminum salt, adding an effective amount of a flocculant to the paint spray booth water, and removing resulting sludge from the paint spray booth water.
Guerrini Robert J.
Rey Paul A.
Calgon Corporation
Goudreau Gage Dubuc
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