Amchem Products, Inc.

Thomas D Henley

Richard F Reeves

Diane Halterman

A chemical treatment for the removal for manganese or manganese and fluoride from an aqueous waste effluent obtained from the acid-fluoride washing or alkali (non-fluoride) washing in a step in the manufacture of aluminum cans. The treatment consists of adding in an acid medium sufficient phosphate ion to react with the manganese and/or fluoride and thereafter adding in an alkali medium sufficient calcium ion to react with the manganese, phosphate and/or fluoride. The ratio of phosphate to calcium ion added is 3:1 to 1:2.5.

Manganese removal from aqueous industrial waste effluents

In a continuous process wherein corrosion resistant and paint adherent coatings are formed on metallic articles and wherein prior to the formation of said coatings, the articles are first subjected to a pre-cleaning stage in which oil emulsion is removed from the surfaces of the articles by washing the articles with an aqueous solution of wash water and demulsifier and the removed oil emulsion is broken and the oil recovered, and wherein the articles having the oil emulsion removed from their surfaces are thereafter subjected to a second cleaning stage in which the articles are contacted with a cleaning solution to remove metal fines from the surfaces of the articles, the improvement comprising including a chelating agent in said aqueous solution of wash water and demulsifier to aid in breaking said oil emulsion and to deter or prevent the formation of precipitates in the cleaning solution of said second cleaning stage.

Removing oil emulsion from articles prior to coating articles and

Oil emulsion is removed from the surfaces of articles by washing the articles with an aqueous solution of wash water and demulsifier, thereby forming a turbulent mixture of the wash water, the demulsifier and the oil emulsion. The demulsifier is effective in breaking the oil emulsion. The liberated oil is allowed to form a separate phase in the solution of wash water/demulsifier, and is removed therefrom in a quiescent stage. The aqueous solution of wash water and demulsifier having the oil removed therefrom is recycled to wash oil emulsion from other of said articles. The preferred demulsifiers are ammonium and alkali metal sulfates and bisulfates.

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Broomall, PA, United States of America

Thomas D Henley