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Improved method for metal heap and dump leaching coupled with metal solvent extraction

A leaching and metal technology, applied in the field of metal extraction, can solve the problem of no recycling

Inactive Publication Date: 2009-10-14
COGNIS IP MANAGEMENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Consequently, the metals remaining in the leached ore are not recovered for a significant period of time

Method used

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  • Improved method for metal heap and dump leaching coupled with metal solvent extraction
  • Improved method for metal heap and dump leaching coupled with metal solvent extraction
  • Improved method for metal heap and dump leaching coupled with metal solvent extraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A

[0068] Comparison of combined and separate leachates using a copper extraction unit with two extraction sections in series and a stripping section

[0069] Consider a combination of high and low grade extracts at 2000m 3 A speed of h gives the case of a bound leachate with 3 g / l Cu. A high-precision computer simulation of the solvent extraction circuit was performed under the conditions described below. The leach solution had 3 g / l Cu, 90 g / l sulphate at pH 1.8, values ​​similar to many heap leach solutions. organic phase is 984N, a copper solvent extractant widely used at concentrations giving 92% copper recovery in typical hydrocarbon diluents. The improved ratio of organic phase to aqueous phase was 1 in the extraction. The copper solvent extraction unit consists of 2 sections of countercurrent extraction section and 1 section of stripping section. This section is widely used in copper solvent extraction units. The lean strip had 35 g / l Cu and 180 g / l sulfuric acid, ...

Embodiment B

[0076] Comparison of combined and separate extracts using a copper extraction unit with a series-parallel extraction section combined with two countercurrent extraction sections and a stripping section

[0077] Consider a combination of high and low grade extracts at 2000m 3 A speed of h gives the case of a bound leachate with 3 g / l Cu. A high-precision computer simulation of the solvent extraction circuit was performed under the conditions described below. The leach solution had 3 g / l Cu, 90 g / l sulphate at pH 1.8, values ​​similar to many heap leach solutions. organic phase is 984N, a copper solvent extractant widely used at concentrations giving 92% copper recovery in typical hydrocarbon diluents. The improved ratio of organic phase to aqueous phase was 1 in the extraction. The copper solvent extraction unit is a series-parallel extraction section combined with two countercurrent extraction sections and a stripping section. Series-parallel extraction stages have becom...

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Abstract

The present invention provides an improved method for recovering one or more metal values ​​from ores containing metal values ​​by heap leaching and / or heap leaching, the method comprising: (a) providing A high-grade leach solution obtained by extracting fresh high-grade ores containing useful components of the first metal; (b) performing a first solvent extraction of the useful components of the first metal on the high-grade leach solution, and using the obtained first aqueous raffinate (c) providing a low-grade leach solution obtained by heap leaching or heap leaching of partially leached ore or fresh low-grade ore of the first metal useful component; and (d) independent of the first solvent extraction of the first metal useful components, a second solvent extraction of the first metal useful components is performed on the low-grade leach solution, and the obtained independent second aqueous raffinate is used to extract part of the leached Extracted ore or fresh lower grade ore; wherein the first and second aqueous raffinates are not intermingled prior to application to their respective ores for leaching. Alternatively, the first and second raffinates are intermixed prior to application to their respective ores for leaching, provided that the aqueous raffinate applied to the fresh, high-grade ore comprises at least 60% by volume of the first aqueous raffinate The raffinate, and the aqueous raffinate applied to the partially leached ore or fresh low-grade ore comprises at least 60% by volume of the second aqueous raffinate.

Description

[0001] Cross References to Related Applications [0002] This application claims priority under 35 U.S.C. §119(e) to Provisional U.S. Patent Application No. 60 / 615,708, filed October 4, 2004. technical field [0003] The present invention relates to the field of metal extraction; more particularly, the present invention relates to an improved method for leaching and recovering useful components of metals from ore heaps and heaps. Background of the invention [0004] Most metals are obtained by extracting those metal values ​​from ores found in the ground. Once the ore has been mined, the metal must be separated from the rest of the ore. One method of separating metals from ores is known as leaching. Generally, the first step in this process is to contact the mined ore with an aqueous solution containing a leachant which extracts the metal from the ore into solution. For example, in copper leaching operations, such as heap leaching or dump leaching of copper ores, sulfuric...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B15/00C22B19/00C22B23/00B01D11/00
Inventor G·A·科尔多斯基A·尼斯比特H·C·海因
Owner COGNIS IP MANAGEMENT GMBH