Compositions – Water-softening or purifying or scale-inhibiting agents
Patent
1995-02-02
1997-04-01
McAvoy, Ellen M.
Compositions
Water-softening or purifying or scale-inhibiting agents
252 60, 252 61, 210724, 210725, 210727, 210729, 210730, 210731, C02F 502, C02F 508
Patent
active
056158629
ABSTRACT:
A powdered composition for treating spent dry film stripping and/or developing solutions comprising: 10 to 70 percent by weight of an aluminum source, such as aluminum sulfate, aluminum chloride; and 28 to 90 percent by weight of siliceous particulates, such as diatomaceous earth, sodium potassium aluminum silicate or expanded perlite. The powdered composition may also include 3 to 35 percent by weight of a metal precipitation agent, such as trimercapto-s-triazine, sodium dimethyldithiocarbamate, starch xanthate, sodium diethydithiocarbamate and thio red, to precipitate the metal from the spent solutions and/or 0 to 10 percent by weight of a dust-suppression agent such as water or propylene glycol. A method of using the disclosed compositions is also revealed in this application.
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