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Process for precious metal recovery from a sulphide ore or concentrate or other feed material

A precious metal and sulfide technology, applied in the field of silver and platinum group metals to recover precious metals such as gold, can solve the problems of high cost, easy to cover recycled metals, and low recovery rate of gold and silver.

Active Publication Date: 2010-05-26
CESL LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, gold and silver themselves are not easy to extract from the Cu process residue with cyanide leaching solution.
[0046] All in all, the cost of leaching copper dross with standard cyanide is high, gold and silver recoveries are low, and the cost of the method tends to outweigh the value of the metal recovered

Method used

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  • Process for precious metal recovery from a sulphide ore or concentrate or other feed material
  • Process for precious metal recovery from a sulphide ore or concentrate or other feed material
  • Process for precious metal recovery from a sulphide ore or concentrate or other feed material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0261] The following examples show the results of the treatment of copper-gold concentrates using known techniques, namely pressure oxidation and leaching to extract copper, followed by cyanidation of the residue with appropriate amounts of cyanide at ambient pressure (in air) to extract gold and silver.

[0262] a) Extract copper

[0263] 143 g of Concentrate I, consisting mainly of chalcopyrite and 20% pyrite with a small amount of bornite, were wet ground in a laboratory rod mill such that 97% of the mineral particles passed through a 45 micron mesh screen. For copper concentrates, the higher pyrite content often results in excessive sulfur oxidation in hydrometallurgical copper recovery processes such as those described in the '708 patent. Use 1050mL containing 12g / L Cl, 12g / L Cu and 15g / L H 2 SO 4 CuSO 4 -CuCl 2 -H 2 SO 4 The solution slurries the finely ground solid with a solid density of 130 g / L. The slurry was placed in a 2L titanium autoclave, which was then ...

Embodiment 2

[0276] The following examples show the effect of increasing cyanide concentration on gold and silver recovery and on cyanide consumption. In order to minimize the loss of cyanide due to high concentration, NaCN was partially added at the beginning (10% of the total amount), and then the remaining 90% was added slowly throughout the reaction to compensate for the loss of cyanide and reduce the cyanide to cyanide. Compounds have always remained at a high level.

[0277] a) Extract copper

[0278] 143 g of Concentrate I (Table 1) were ground again and subjected to batch pressure oxidation under conditions similar to those described in Example 1, except that the residence time was reduced to 60 minutes. Gold and silver were extracted with washed residue containing 10.5g / t gold and 43g / t silver.

[0279] b) Extraction of gold and silver

[0280] 121 g of the residue from the copper extraction step were reslurried with fresh water to a solid density of 400 g / L and then neutralize...

Embodiment 3

[0287] The following example replicates the conditions of Example 2, cyaniding at ambient air pressure with continuous addition of cyanide during leaching, but increasing the cyanide concentration even further to show its effect on the extraction of gold and silver.

[0288] a) Extract copper

[0289] Concentrate I was ground again and subjected to batch pressure oxidation under conditions similar to those described in Example 2.

[0290] After pressure oxidation under these conditions for 60 minutes, the slurry was cooled, filtered to produce a primary filtrate, which was then washed thoroughly with water to produce a residue containing 1.0% copper, 10.5g / t gold and 56g / t silver, and a secondary or wash filtrate. Based on the copper content in the residue, copper extraction was 97% with a mass loss of 17%.

[0291] b) Extraction of gold and silver

[0292] As in Examples 2 and 3, 75 g of the residue from the copper extraction step (on a dry weight basis) was reslurried in ...

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Abstract

A process for the extraction of a precious metal, such as gold or silver, from a sulphide ore or concentrate or other source material comprises subjecting the source material to pressure oxidation to produce a pressure oxidation slurry. The pressure oxidation slurry is flashed down to a lower temperature and pressure and is then subjected to a liquid / solid separation to obtain a pressure oxidation solution and a solid residue containing the precious metal. The solid residue is then subjected to cyanidation to extract the precious metal. The formation of thiocyanide during cyanidation is minimized or counteracted by effecting the cyanidation at an elevated oxygen pressure and a reduced retention time, such as 30 to 90 minutes. A method for the reduction of copper cyanide formation during cyanidation leaching is also provided.

Description

technical field [0001] This invention relates to a process for the recovery of precious metals such as gold, silver and platinum group metals from sulphide concentrates, ores or other raw materials. Background technique [0002] Applicants have developed a hydrometallurgical technique for the processing of copper concentrates to produce refined copper cathodes using efficient, environmentally friendly and clean methods. This method is called "CESL TM Copper Method", embodiments of which are described in U.S. Patent No. 5,645,708 (the '708 patent), the entire contents of which are incorporated herein by reference. [0003] The process described in the '708 patent broadly includes the pressurized oxidation of a copper concentrate in the presence of an acidic chloride solution to produce a solid containing basic copper salts etc. and a pressurized oxidation solution containing copper in solution, depending on Properties of concentrate and pH during pressurized oxidation. Sub...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/08C22B1/00C22B3/04C22B3/22C22B3/24
CPCC22B15/0008C22B3/10C22B1/00C22B11/08C22B3/22C22B15/0069Y02P10/20
Inventor D·L·琼斯
Owner CESL LIMITED
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