Title:
【発明の名称】金属で汚染された土壌の除染方法
Document Type and Number:
Japanese Patent JPH07507960
Kind Code:
A
Abstract:
PCT No. PCT/FR93/00461 Sec. 371 Date Feb. 10, 1995 Sec. 102(e) Date Feb. 10, 1995 PCT Filed May 13, 1993 PCT Pub. No. WO93/24249 PCT Pub. Date Dec. 9, 1993The invention relates to a hydrometallurgical process for decontaminating soils 1 which are polluted with metallic elements, comprising a stage of basic leaching I so as to bring about the dissolution of the metallic elements to be removed, a cementation stage II bringing about the precipitation 6 of said elements in metal form, performed by electrochemical exchange with a zinc powder 5 produced by a stage of electrolysis III of the solution 7 originating from the cementation stage. In accordance with the invention a complementary addition of zinc is performed, preferably at the exit of the leaching stage in the form of a leachate 17 of waste from iron and steel manufacture, especially of dust 13 from electrical steel manufacture 15.
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Inventors:
RIZET LAURENT (FR)
CHARPENTIER PIERRE EMMANUEL (FR)
CHARPENTIER PIERRE EMMANUEL (FR)
Application Number:
JP50025093A
Publication Date:
September 07, 1995
Filing Date:
May 13, 1993
Export Citation:
Assignee:
UNIMETALL SA (FR)
International Classes:
B09C1/02; B09C1/08; C22B3/14; C22B7/00; C25C5/02; B09B3/00; (IPC1-7): B09C1/02; B09B3/00; B09C1/08; C22B7/00
Attorney, Agent or Firm:
Takashi Koshiba