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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 (Liuyang National Economic & Technological Development Zone(Liuyang 319 National Highway), Changsha, Hunan 0, 410330, CN)
SONG, Leshan (Liuyang National Economic & Technological Development Zone(Liuyang 319 National Highway), Changsha, Hunan 0, 410330, CN)
YAN, Haiyan (Liuyang National Economic & Technological Development Zone(Liuyang 319 National Highway), Changsha, Hunan 0, 410330, CN)
QUE, Xiongjie (Liuyang National Economic & Technological Development Zone, Changsha, Hunan 0, 410330, CN)
LIU, Bao (Liuyang National Economic & Technological Development Zone, Changsha, Hunan 0, 410330, CN)
CAI, Qunhuan (Liuyang National Economic & Technological Development Zone, Changsha, Hunan 0, 410330, CN)
LIU, Jie (Liuyang National Economic & Technological Development Zone, Changsha, Hunan 0, 410330, CN)
YAO, Yongge (Liuyang National Economic & Technological Development Zone, Changsha, Hunan 0, 410330, CN)
SUN, Biyu (Liuyang National Economic & Technological Development Zone, Changsha, Hunan 0, 410330, CN)
Application Number:
CN2015/082286
Publication Date:
September 29, 2016
Filing Date:
June 25, 2015
Export Citation:
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Assignee:
HUNAN YONKER ENVIRONMENTAL PROTECTION RESEARCH INSTITUTE CO., LTD. (Liuyang National Economic & Technological Development Zone(Liuyang 319 National Highway), Changsha, Hunan 0, 410330, 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 (59# Bayi Rd, Changsha, Hunan 1, 410001, CN)
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