Cleaning waste water from glass industry - using type I or II anion exchangers to remove arsenic and antimony fluoride complex ions

摘要

Rinsing water from the glass industry which contains H2SO4, HF, As and/or Sb as well as possibly Pb is conducted through an anion exchanger of type I or II where the As- and Sb-fluoride complex ions are removed in a first stage followed by a second treatment with Ca(OH)2 to ppte. out arsenates and antimonates. Pref. the first treatment is carried out at a water pH of 0-2. The exchange is a macro-porous anion exchange contg. chloride or hydroxyl ions. USE/ADVANTAGE - Cleaning the waste water from glass melting, mechanical grinding and acid polishing. The complex ions are removed before the H2SO4.