[The golden rule is never to mix two wastes. In any case do not mix list 'A' waste with list 'B' waste]

A Spend cyanide solutions

B Acid sludge, acid tar, Acid and water. Battery acid, Chemical cleaners, Electrolyte, acid Etching liquid or solvent,    Pickling liquor and other corrosive acids, Spend mixed acid, Spent sulfuric acid

This waste maybe found in following industries

Chemicals processing industries, metal treatment and coating, coking plant, pesticides, pharmaceuticals, dyes, acryl ate, metallurgy, mining, polymers, extraction of gold/silver, elastomer and electroplating