Method for the recovery of gold from sulphide concentrate

A technology for recovery of sulfide and gold, applied in the direction of improving process efficiency, etc., can solve problems such as large demand for neutralization, oxidation, and difficulty in dissolving chalcopyrite, and achieve the effect of increasing gold output
CN101120106AInactive Publication Date: 2008-02-06OUTOTEC OYJ
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
OUTOTEC OYJ
Publication Date
2008-02-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for recovering gold from a sulphidic concentrate, particularly one containing arsenopyrite and / or pyrite, hydro- metallurgically. The concentrate is first subjected to leaching with a concentrated solution of alkali chloride and copper (II) chloride, by means of which the copper minerals and some of the gold in the concentrate are made to dissolve. Elemental sulphur and precipitated iron and arsenic compounds are separated from the leaching residue using physical separation methods, whereby the first intermediate is obtained, which contains gold- bearing sulphide minerals and gangue minerals as well as the gold that remains undissolved. The free gold that remains undissolved is separated by means of gravity separation methods. After gravity separation, additional comminution is carried out, after which the sulphide minerals are decomposed and the gold-containing solution or residue is routed to the concentrate leaching circuit.
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Description

technical field

[0001] The present invention relates to a process for the hydrometallurgical recovery of gold from sulphide concentrates, in particular from sulphide concentrates containing arsenopyrite and / or pyrite. The concentrate is first leached with a concentrated solution of alkali metal chlorides and copper(II) chloride, whereby the copper minerals and some gold in the concentrate are dissolved. Elemental sulfur and precipitated iron and arsenic compounds are separated from the leach residue using physical separation methods to obtain a first intermediate product containing gold-bearing sulfide and gangue minerals and undissolved gold. Undissolved free gold is separated by gravity separation. After gravity separation, additional comminution is performed, after which the sulphide minerals are broken down and the gold-bearing solution or residue is sent to the concentrate leaching cycle. Background technique

[0002] Copper concentrates contain various amounts of gol...

Claims

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