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1. (WO2018029290) CO-TREATMENT OF FLUE GAS CLEANING WASTE AND ACIDIC SCRUBBER LIQUID

Pub. No.:    WO/2018/029290    International Application No.:    PCT/EP2017/070281
Publication Date: Fri Feb 16 00:59:59 CET 2018 International Filing Date: Fri Aug 11 01:59:59 CEST 2017
IPC: B01D 53/66
B01D 53/68
B01D 53/77
F23J 15/04
B09B 3/00
Applicants: STENA RECYCLING INTERNATIONAL AB
Inventors: RASMUSSEN, Erik
Title: CO-TREATMENT OF FLUE GAS CLEANING WASTE AND ACIDIC SCRUBBER LIQUID
Abstract:
The present invention relates to a method of treating heavy metal and halogen salt- containing solid waste material mainly from flue gas cleaning systems, the method comprising i) treating said solid waste material with acidic scrubber liquid to obtain a suspension with a pH of from 3 to 7 in the liquid phase, ii) separating solid and liquid material obtained in step i), iii) treating the solid material from step ii) with water to obtain a pH in the aqueous phase ranging from about 7 to about 1 1 followed by separation of the thus washed solid material from the liquid to obtain treated solid waste, iv) treating the liquid material from step ii) with one or more alkaline agent(s) and/or sulfides to obtain a pH of from about 9 to 1 1 to precipitate heavy metals, v) optionally, separating the heavy metals from step iv) from the liquid to obtain a heavy metal fraction and a halogen salt solution.