PROCEDIMIENTO PARA LA ELIMINACION EXHAUSTIVA DEL CROMO TOTALEN LAS AGUAS RESIDUALES DE LOS BANOS TINTOREOS CON COLORAN- TES AL MORDIENTE

摘要

In the process of dyeing with mordant dyes and a chromating agent, soluble thiosulphate is incorporated at the same time as, or after, the addition of the chromating agent, at pH 3-4 to leave the eventual spent bath depleted in chromium, and substantially free from Cr<6+>. The soluble thiosulphate may be an alkali metal or ammonium thiosulphate.