Title:
METHOD FOR ENRICHING AND RECOVERING CHROMIUM RESOURCES BY SYNERGISTIC UTILIZATION OF CHROMIUM-CONTAINING SLUDGE AND CHROMIUM-CONTAINING WASTE RESIDUE
Document Type and Number:
WIPO Patent Application WO/2023/004925
Kind Code:
A1
Abstract:
A method for enriching and recovering chromium resources by means of the synergistic utilization of chromium-containing sludge and chromium-containing waste residue: the chromium-containing sludge and the chromium-containing waste residue are finely ground and mixed to prepare a mixture, the mixture alkalinity ((CaO%+MgO%)/(SiO2%+Al2O3%)) is within the range of 0.6 to 1.5, and FeOx content is greater than or equal to 15.0%. The mixture is subject to reduction roasting, and the roasting temperature is controlled to be within the range of 1100 to 1500°C. After grinding the roasted product, iron-chromium spinel is separated by using a strong magnetic separation process to obtain a chromium concentrate which has a Cr2O3 content that is greater than or equal to 20.0% and a Cr2O3 recovery rate that is greater than or equal to 85.0%. Two chromium-containing hazardous waste resources, i.e. the chromium-containing sludge and the chromium-containing waste residue are combined, and the chromium in the two resources is enriched at the same time, so that an obtained chromium-containing enriched phase has a high chromium grade, and by utilizing subsequent separation, has the characteristics of high efficiency, low pollution and a wide application range, which is suitable for application in the technical field of chromium enrichment and separation in chromium-containing resources.
Inventors:
WANG DAYA (CN)
HUA SHAOGUANG (CN)
LI SHUQIN (CN)
LI XIANGMEI (CN)
PEI DEJIAN (CN)
LI GANG (CN)
HUA SHAOGUANG (CN)
LI SHUQIN (CN)
LI XIANGMEI (CN)
PEI DEJIAN (CN)
LI GANG (CN)
Application Number:
PCT/CN2021/116007
Publication Date:
February 02, 2023
Filing Date:
September 01, 2021
Export Citation:
Assignee:
SINOSTEEL MAANSHAN GENERAL INSTITUTE OF MINING RES CO LTD (CN)
HUAWEI NATIONAL ENGINEERING RES CENTER OF HIGH EFFICIENT RECYCLE AND UTILIZATION FOR METALLIC MINERA (CN)
ENGINEERING INVESTIG & DESIGN INSTITUTE OF SINOSTEEL MIMR CO LTD (CN)
HUAWEI NATIONAL ENGINEERING RES CENTER OF HIGH EFFICIENT RECYCLE AND UTILIZATION FOR METALLIC MINERA (CN)
ENGINEERING INVESTIG & DESIGN INSTITUTE OF SINOSTEEL MIMR CO LTD (CN)
International Classes:
C22B1/02; C22B7/00; C22B7/04; C22B34/32
Foreign References:
| CN111455170A | 2020-07-28 | |||
| CN102796879A | 2012-11-28 | |||
| CN105121669A | 2015-12-02 | |||
| CN103361484A | 2013-10-23 | |||
| CN101138670A | 2008-03-12 | |||
| CN103937961A | 2014-07-23 | |||
| CN101144110A | 2008-03-19 | |||
| JPS5556897A | 1980-04-26 |
Attorney, Agent or Firm:
MA'ANSHAN CITY JINQIAO PATENT AGENT LTD. (CN)
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