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Recovery process for precious metals

a recovery process and precious metal technology, applied in the field of recovery process for precious metals, can solve the problems of high consumption of leaching solution and general toxicity, and achieve the effect of reducing capital and operating costs and reducing retention times

Inactive Publication Date: 2009-02-05
COREM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]It is an aim of the present invention to provide a process for recovering precious metals from ores that reduce the retention times and reduce capital and operating costs.

Problems solved by technology

However, there is always a balance between cost for size reduction and retention times.
Several disadvantages occur from these long retention times such as passivation problems and high consumption of the leaching solution, which is generally highly toxic.

Method used

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  • Recovery process for precious metals
  • Recovery process for precious metals
  • Recovery process for precious metals

Examples

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example 1

Laboratory Processing of a Gold Ore Sample

[0039]A gold bearing ore from the Iamgold, Sleeping Giant Mine division was provided. The ore was processed as per the flowsheet presented in FIG. 1 in laboratory size equipment. The ore was comminuted in a closed loop grinding step with an addition of cyanide in the laboratory size equipment. The ore particles were separated by screening into two particle size classes: a fine particle class and a coarse particle class. The fine particle class have a d80 smaller than 38 μm, and preferably less than 25 μm. The coarse particles were characterized by a d80 larger than 38 μm but smaller than 150 μm, preferably smaller than 100 μm and most preferably smaller than 80 μm. 40 wt % of the ore was contained in the coarse particle class and the remaining 60 wt % of the ore was contained in the fine particle class. The coarse particle class had a mean gold grade of 2 gram per tonne while the fine particle class had a mean gold grade of 7 gram per tonne....

example 2

Industrially Comminuted Ore Sample with Laboratory Scale Gold Recovery

[0049]An gold bearing ore sample from the Iamgold, Sleeping Giant Mine division was obtained from the full sized comminution circuit of the operating gold plant. The industrially comminuted ore sample was processed in laboratory size equipment using a flowsheet as per FIG. 1. For greater clarity the ore sample collected and used as the feed stream for cyanidation, is equivalent to feed stream 18 (stream and equipment reference numbers are as per FIG. 1). The process steps of unit operation 12 and 16 in FIG. 1 were conducted at an Industrial scale. As in Example 1, the industrially comminuted ore of Example 2 was comminuted with an addition of cyanide.

[0050]In Example 2 the industrially comminuted ore particles from feed stream 18 were classified using a 1¼″ hydrocyclone 20. The cut size (d50c) from the hydrocyclone 20, was 28 μm, as can be determined from FIG. 5 and indicated as the a mass ratio of underflow 26 to...

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Abstract

A recovery process for at least one precious metal contained in an ore, includes: comminuting the ore to obtain particles smaller than a predetermined particle size; separating the particles into at least two groups, each group being characterized by a particle size range; and leaching separately each group of particles with a reagent adapted to dissolve the at least one precious metal.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The invention relates to a recovery process for precious metals contained in an ore and, more particularly, to a leaching process for recovering at least one precious metal.[0003]2. Description of the Prior Art[0004]When physical methods for separation cannot secure optimal metal value of an ore, leaching is an alternative. For most leaching processes, the ore is first comminuted and the particles obtained are brought in contact with a reagent (or a leaching solution) for some retention time for the reagent to react with the particles.[0005]For precious metals, such as gold and silver, the leaching is normally carried out on fine particles since faster kinetics are obtained for smaller particles. However, there is always a balance between cost for size reduction and retention times.[0006]Extracting plants for precious metals are typically conceived with retention times of more than 48 hours. Several disadvantages occur ...

Claims

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Application Information

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IPC IPC(8): C22B11/00
CPCC22B1/00C22B11/08C22B3/22Y02P10/20
Inventor OURRIBAN, MOHAMEDGAGNON, ROCKBLATTER, PAUL
Owner COREM
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