WO2024057216 - OXIDATIVE NITRATE HEAP LEACHING PROCESS
National phase entry:
Publication Number
WO/2024/057216
Publication Date
21.03.2024
International Application No.
PCT/IB2023/059066
International Filing Date
13.09.2023
Title **
[English]
OXIDATIVE NITRATE HEAP LEACHING PROCESS
[French]
PROCÉDÉ DE LIXIVIATION OXYDATIVE DE NITRATE EN TAS
Applicants **
BHP CHILE INC
Inventors
CHIBWANA, Clement Chilowa
Priority Data
2022/10270
16.09.2022
ZA
Application details
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International Searching Authority |
EPO
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| Recordal of a Change of the Applicant's Name/Address |
Change of Applicant's Name and Address
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| Type of Assignment |
The Standard Agent's Assignment
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| Applicant's Legal Status |
Legal Entity
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| Entry into National Phase under |
Chapter II
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Send the Letters Patent by Courier
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Quotation for National Phase entry
| Country | Stages | Total | |
|---|---|---|---|
| China | Filing, Examination, Granting | 2207 | |
| EPO | Filing, Examination, Granting | 8801 | |
| Japan | Filing, Examination, Granting | 2153 | |
| South Korea | Filing, Examination, Granting | 2071 | |
| USA | Filing, Examination, Granting | 4740 |
Total:
19,972
The term for entry into the National Phase has expired. This quotation is for informational purposes only
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Abstract[English]
A method of extracting copper from a sulfide mineral ore including the steps of stacking the ore to form a heap, in a leach step, irrigating the heap with a first irrigation solution containing an acid nitrate solution and nitrite thereby to cause oxidation of sulfide minerals within the heap, oxidising nitric oxide gas released during the oxidation of the sulfide minerals within the heap by oxygen to form nitrogen dioxide, and hydrolysing the nitrogen dioxide to form nitric acid and/or nitrous acid in the first irrigation solution within the heap, to continue the leach step and to reduce the loss of nitric oxide from the heap.[French]
L'invention concerne un procédé d'extraction de cuivre d'un minerai de sulfure, qui comprend les étapes consistant à : empiler le minerai pour former un tas; dans une étape de lixiviation, irriguer le tas à l'aide d'une première solution d'irrigation contenant une solution de nitrate acide et du nitrite pour provoquer ainsi l'oxydation de minéraux sulfurés à l'intérieur du tas; oxyder le gaz d'oxyde nitrique libéré pendant l'oxydation des minéraux sulfurés à l'intérieur du tas par l'oxygène pour former du dioxyde d'azote; et hydrolyser le dioxyde d'azote pour former de l'acide nitrique et/ou de l'acide nitreux dans la première solution d'irrigation à l'intérieur du tas, pour poursuivre l'étape de lixiviation et pour réduire la perte d'oxyde nitrique du tas.