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1. (WO2018178371) TREATMENT OF QUARRY LIQUID EFFLUENT

Pub. No.:    WO/2018/178371    International Application No.:    PCT/EP2018/058358
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Sat Mar 31 01:59:59 CEST 2018
IPC: B01J 35/02
C07C 9/00
C07C 1/00
C07C 2/00
C07C 45/00
C07C 253/00
C22B 3/00
B01J 37/03
B01J 37/06
B01J 37/12
B01J 23/889
B01J 23/00
B01J 23/02
B01J 23/34
C02F 1/64
C02F 1/72
C22B 3/20
C22B 47/00
Applicants: CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
Inventors: GRISON, Claude
Title: TREATMENT OF QUARRY LIQUID EFFLUENT
Abstract:
The present invention relates to a method for the production of a solid material comprising manganese, said method including the following steps: a) bringing an aqueous effluent comprising manganese, e.g. at least 5 mg/L, typically at least between 5 and 50 mg/L, and preferably between 7 and 25 mg/L manganese, into contact with a manganese-oxidizing agent, preferably at a temperature of between 10°C and 50°C, and obtaining an oxidised aqueous solution; b) adding a base to the oxidized aqueous solution obtained in step (a) until a pH of between 8 and 12, preferably greater than 9 and more preferably between 9 and 10.5 is reached, and obtaining a solution comprising a precipitate; c) filtering the solution obtained in step (b); and d) obtaining a solid material comprising manganese, in particular manganese (IV) and/or Mn (III).