Process of removal of heavy metals from incinerated sewage sludge

摘要

Method for separating heavy metals from phosphate containing sewage sludge ash, comprises heating the sewage sludge to a temperature of above the boiling point of the oxychloride or chloride of the heavy metals; removing the heated sludge; contacting the heated sludge with atmosphere containing chlorine gas to form gaseous oxychloride or chloride of the heavy metals; and collecting the oxychloride or chloride of the heavy metals.