Title:
METHOD FOR LEACHING LATERITE NICKEL ORE
Document Type and Number:
WIPO Patent Application WO/2020/181606
Kind Code:
A1
Abstract:
A method for leaching laterite nickel ore. The leaching method comprises the following steps: 1) concentrating an original laterite nickel ore pulp having a particle size of less than 0.074mm into a laterite nickel ore pulp having an underflow concentration of greater than 25%; 2) adding concentrated sulfuric acid into the laterite nickel ore pulp obtained in step 1), and pre-leaching under atmospheric pressure at no less than 75°C for at least 2h, the mass ratio of acid to dry ore being at least 1:1; 3) dispensing the laterite nickel ore pulp obtained in step 1) into the pre-leached reaction system in step 2) and performing oxygen pressure leaching to obtain a leached solution. The described method applies pre-leaching under atmospheric pressure and leaching under oxygen pressure, which effectively reduces acid consumption while guaranteeing that the leaching rate of nickel is higher than 90%; meanwhile, the requirements on equipment are reduced, and equipment investment and equipment maintenance costs are lowered.
Inventors:
XU KAIHUA (CN)
LI QINXIANG (CN)
ZHU SHAOWEN (CN)
DING LIULIANG (CN)
LI QINXIANG (CN)
ZHU SHAOWEN (CN)
DING LIULIANG (CN)
Application Number:
PCT/CN2019/082183
Publication Date:
September 17, 2020
Filing Date:
April 11, 2019
Export Citation:
Assignee:
JINGMEN GEM CO LTD (CN)
International Classes:
C22B3/08; C22B23/00
Domestic Patent References:
| WO2015009254A2 | 2015-01-22 |
Foreign References:
| CN103614571A | 2014-03-05 | |||
| CN102534206A | 2012-07-04 | |||
| BR201103741B1 |
Attorney, Agent or Firm:
CN-KNOWHOW INTELLECTUAL PROPERTY AGENT LIMITED (CN)
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