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Method of leaching copper sulfide ores containing chalcopyrite

a technology of copper sulfide ores and leaching methods, which is applied in the direction of biological water/sewage treatment, water/sludge/sewage treatment, chemistry apparatus and processes, etc., can solve the problems of limited target ores used for hydrometallurgy, copper oxide ore reserves that can be used, and leaching takes several years to achieve the effect of efficient and cost-effectiv

Inactive Publication Date: 2008-01-31
JX NIPPON MINING& METALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]In view of the aforementioned reasons, it is an objective of the present invention to provide a method of recovering copper from primary copper sulfide ores containing chalcopyrite as a main constituent under versatile conditions for real operation in an efficient and cost-effective manner.

Problems solved by technology

Thus, target ores used for hydrometallurgy have been limited to copper oxide ores that are readily dissolved in sulfuric acid.
However, in general, there are fewer copper oxide ore reserves that can be used are than copper sulfide ore reserves.
However, with such heap leaching method, leaching takes several years.
In addition, leaching rate of copper is extremely low, resulting in poor efficiency.
However, chalcopyrite is substantially insoluble in sulfuric acid.
In addition, the copper leaching rate is extremely slow.
Although all of the aforementioned methods are effective for improving leaching rate to some extent, such methods are problematic because of the high costs of energy and reagents used.
Further, at an advanced stage of a leaching reaction, the leaching rate is significantly lowered due to a leaching inhibition phenomenon caused by residual sulfur on the surface of a sulfur-containing concentrate, which is also problematic.
Therefore, in practice, there is no practicable technology involving hydrometallurgy with the use of primary copper sulfide ores containing chalcopyrite.

Method used

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  • Method of leaching copper sulfide ores containing chalcopyrite
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  • Method of leaching copper sulfide ores containing chalcopyrite

Examples

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Effect test

examples 1 and 2

[0034]Concentrate (mined in Candelaria) containing chalcopyrite as a main constituent was used as a target ore. The quality of the concentrate was as follows: Cu=28% by mass; Fe=28% by mass; and S=32% by mass.

[0035]Three grams of the above concentrate was mixed with 300 mL of a leaching solution (containing: ammonium sulfate=3 g / L; potassium hydrogen phosphate=0.5 g / L; magnesium sulfate heptahydrate=0.5 g / L; and potassium chloride=0.1 g / L) that had been adjusted to a pH of 1.8 with sulfuric acid and poured into a 500 mL Shaking flask. To the leaching solution in the flask, sodium chloride was added so that the chloride ion concentration became 6 g / L (Example 1) or 12 g / L (Example 2), and a chloride ion-resistant sulfur-oxidizing bacterium (Acidithiobacillus sp. TTH-19A strain: accession no. NITE P-164) was further added at a density of 1×107 cells / mL. Then the flask was shaken at room temperature for a certain period of time. The bacterial density, pH, and copper concentration of th...

examples 3 and 4

[0043]Shaking leaching was performed at room temperature in the same manner as in Example 1 except that sulfuric acid was added to the leaching solution described in Example 1 so that the leaching solution was adjusted to a pH of 1.6 (Example 3) or a pH of 2.0 (Example 4). The bacterial density and copper concentration of the supernatant of the leaching solution were measured. Then, time course changes in measurement results were examined.

examples 5 and 6

[0048]Shaking leaching was performed at room temperature in the same manner as in Example 1 except that the initial copper (II) ion concentration and the initial iron (II) ion concentration in the leaching solution were adjusted to 0.5 g / L (Example 5) or 1.0 g / L (Example 6). An increase in the copper concentration in the supernatant of the leaching solution was measured. Then, time course changes in the measurement results were examined.

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Abstract

An object of the present invention is to provide a method of efficiently leaching copper from copper sulfide ores containing chalcopyrite at room temperature.A method of recovering copper from copper sulfide ores, characterized by comprising: using a sulfuric acid solution having a chloride ion concentration adjusted to 6 g / L or more but less than 18 g / L and a pH adjusted to 1.6 or more but less than 2.5 as a leaching solution; and carrying out copper leaching with the addition of a chloride ion-resistant sulfur-oxidizing bacterium to the leaching solution, when recovering copper from copper sulfide ores containing chalcopyrite, is provided.

Description

TECHNICAL FIELD[0001]The present invention relates to a method of efficiently recovering copper from copper sulfide ores and particularly from primary copper sulfide ores such as chalcopyrite.BACKGROUND ART[0002]Hitherto, copper metallurgy has been carried out mainly by pyrometallurgy whereby copper metal is obtained by electrolyzing crude copper that is obtained via concentrate smelting. However, in view of energy saving and influences upon the environment, hydrometallurgy (SX-EW: solvent extraction-electrowinning) not involving smelting has been rapidly adopted in recent years. Hydrometallurgy is regarded as a technology to replace pyrometallurgy. In the SX-EW method, copper is dissolved from copper ores with the use of sulfuric acid, copper is removed from the leach solution with the use of an organic solvent, and electrolytic copper is obtained via electrolysis. A typical solvent used for hydrometallurgy of copper ores is sulfuric acid. Thus, target ores used for hydrometallurgy...

Claims

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Application Information

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IPC IPC(8): C22B15/00
CPCC22B3/18C22B15/0071C22B15/0069Y02P10/20
Inventor OHTSUKA, NORIMASAMITARAI, TSUYOSHI
Owner JX NIPPON MINING& METALS CORP
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