Title:
CONTINUOUS ELECTROCHEMICAL LEAD REFINING METHOD
Document Type and Number:
Japanese Patent JP3934685
Kind Code:
B2
Abstract:
PURPOSE: To easily refine lead having high purity.
CONSTITUTION: Lead 1 to be refined is fine size having ≤50 mm and is leached by using a leaching device 2 with a solution of ferric fluoroborate in fluoroboric acid. At the leaching step, the ferric fluoroborate is changed into ferrous fluoroborate in the follow reaction to dissove the lead. 2Fe(BF4)3+Pb → Pb(BF4)2+2Fe(BF4)2. The leaching device is acted as an outer anode disposed at the outer part of a cell. The obtd. solution is sent to a cathode section 6 of a diaphragm cell 7 and the lead having high purity is compactly deposited on the cathode of stainless steel. The solution in which the lead is reduced, is sent to the anode section 10 in the same cell and the ferrous fluoroborate is oxidized to the ferric fluoroborate on the anode.
Inventors:
Marco Olpar
Application Number:
JP20602293A
Publication Date:
June 20, 2007
Filing Date:
August 20, 1993
Export Citation:
Assignee:
ECOCHEM AKTIENGESELLSCHAFT
International Classes:
C22B13/00; C25C1/18; (IPC1-7): C22B13/00
Domestic Patent References:
| JP59502029A |
Foreign References:
| EP0411687A2 | ||||
| EP0508960A1 |
Attorney, Agent or Firm:
Kenho Ikeda