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Title:
METHOD FOR PRETREATING INCINERATION ASH OF CIRCUIT BOARD AND RECOVERING BROMINE
Document Type and Number:
WIPO Patent Application WO/2019/128862
Kind Code:
A1
Abstract:
The present invention provides a method for pretreating incineration ash of a circuit board and recovering bromine, belongs to the field of comprehensive recovery of ash whole-wet valuable metals, and particularly relates to a method for recovering a valuable metal, enriching a precious metal and recovering a bromine salt during the pretreatment process of incineration ash of a circuit board. The method mainly comprises the following steps: extracting a mixed alkali, recovering copper via copper extraction and back extraction, carrying out neutralization and precipitation to separate lead and zinc, evaporating and crystallizing bromine, regenerating the mixed alkali extracting liquor, removing zinc by means of acid pickling, evaporating and crystallizing zinc, carrying out zinc and copper removal on a mixed alkali extracting residue, etc. Compared with a traditional ash comprehensive recovery process, the technology has the advantages that the recovery of valuable metals, such as copper, zinc and lead, and the enrichment of precious metal, such as silver, in the pretreatment process of the ash is realized to the maximum extent; at the same time, the bromine salt is separated and recovered; and the method has the characteristics of a high recovery added value, no tail liquid drainage and the like.

Inventors:
WU YUFENG (CN)
PAN DEAN (CN)
ZUO TIEYONG (CN)
LI BIN (CN)
Application Number:
CN2018/122612
Publication Date:
July 04, 2019
Filing Date:
December 21, 2018
Export Citation:
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Assignee:
UNIV BEIJING TECHNOLOGY (CN)
International Classes:
C22B7/02; C22B3/12
Domestic Patent References:
WO2010149841A12010-12-29
Foreign References:
CN108118157A2018-06-05
CN105755289A2016-07-13
CN106381392A2017-02-08
CN106755996A2017-05-31
CN106636656A2017-05-10
CN106591586A2017-04-26
Attorney, Agent or Firm:
BEIJING SIHAI TIANDA INTELLECTUAL PROPERTY AGENCY LTD. (CN)
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