METHOD OF CHROMATE IONS NEUTRALIZATION FROM ALKALINE SEPARATING LIQUIDS

摘要

The solution regards elimination of toxic chrome ions which accumulate in alkaline separation liquids applied in processes in paint shops. In principle, compounds containing chrome ions reduce down to chrome hydroxide by reaction between the separation liquid and aluminium dust in an alkaline medium with a result that the separation liquid can be, after having removed the sludge and corrected the proportion between the aluminates and hydroxides, re-used in the paint shop. After neutralization the remaining sludge is not environmentally harmful.