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Title:
PROCESS FOR RECOVERING CHROMIUM FROM HEXAVALENT CHROMIUM-CONTAINING WASTEWATER
Document Type and Number:
WIPO Patent Application WO/2016/150022
Kind Code:
A1
Abstract:
A process for recovering chromium from hexavalent chromium-containing wastewater comprises the following steps: (1) extracting hexavalent chromium in wastewater to an organic phase by using an extracting agent, and separating hexavalent chromium from a water phase, so as to acquire a hexavalent chromium-loaded organic phase; (2) reducing the hexavalent chromium-loaded organic phase by using an aqueous solution of an organic reducing agent, reducing hexavalent chromium into trivalent chromium, reversely extracting trivalent chromium into the water phase, and separating the organic phase from the water phase to acquire a solution of the trivalent chromium and a renewable organic phase, wherein the organic reducing agent is one or a mixture of alcohols, aldehydes and carboxylic acids having the carbon atom number ranging 1 to 3; and (3) performing solvent evaporation on the solution of trivalent chromium, catalyzing, and recovering the trivalent chromium.

Inventors:
HE QIANFENG (CN)
SONG LESHAN (CN)
YAN HAIYAN (CN)
QUE XIONGJIE (CN)
LIU BAO (CN)
CAI QUNHUAN (CN)
LIU JIE (CN)
YAO YONGGE (CN)
SUN BIYU (CN)
Application Number:
CN2015/082286
Publication Date:
September 29, 2016
Filing Date:
June 25, 2015
Export Citation:
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Assignee:
HUNAN YONKER ENV PROT RES INST CO LTD (CN)
International Classes:
C02F9/10; C22B3/26
Foreign References:
CN101121962A2008-02-13
CN102503003A2012-06-20
CN102531139A2012-07-04
CN101955274A2011-01-26
US20040129636A12004-07-08
CN102618726A2012-08-01
Attorney, Agent or Firm:
CHANGSHA ZONEKEY PATENT LAW FIRM (410001, CN)
长沙正奇专利事务所有限责任公司 (410001, CN)
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