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Method for extracting copper from mixed copper ores

A technology of mixed type and copper ore, which is applied in the field of extracting copper from low-grade mixed type copper ore, can solve the problems of high cost, difficulty in application, and serious pollution of the environment by flue gas, and achieve less investment, reduced investment in large-scale production, low cost effect

Inactive Publication Date: 2003-06-18
ZIJIN MINING GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this method to treat mixed type copper ore has problems such as complex process, large investment, large transportation volume, high cost, serious pollution of the environment by the flue gas produced by roasting acid, low extraction rate of copper oxide, and difficulty in selling the by-product sulfuric acid. Difficult to apply, especially in remote areas with poor infrastructure, this type of method is even more difficult to apply
The other is combined pyrometallurgy and wet smelting, that is, the copper sulfide ore is subjected to grinding, grading, flotation, and the copper concentrate is subjected to pyrometallurgy and electrolytic purification to obtain copper and by-product sulfuric acid, which is then used to leach copper oxide ore , or after the copper concentrate is roasted to make acid, the calcine and the crushed copper oxide ore are ground and graded and then leached with sulfuric acid, and the leaching solution is extracted by an extraction-electrowinning process to extract copper. This type of method also has large investment and high cost. , serious pollution and other problems, especially in the establishment of pyrometallurgical smelting plants or roasting plants in plateau areas, problems such as lack of oxygen and extreme cold need to be solved
Therefore, in remote areas with poor infrastructure and no pyrometallurgical smelting plants, the copper resources of this mixed type of copper deposit have been difficult to be developed and utilized, and the local resource advantages cannot be transformed into economic advantages.

Method used

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  • Method for extracting copper from mixed copper ores
  • Method for extracting copper from mixed copper ores
  • Method for extracting copper from mixed copper ores

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The leached copper sulfide mineral composition (%): Cu 0.66, Fe 3.88, S 3.83, copper oxide mineral composition (%): Cu 9.29, Fe 17.68, S 0.85.

[0021]

[0022] At this time, the pH of the extraction liquid is significantly lower than the pH value of the spray liquid required by the bacterial leaching process, which is 2. Therefore, water is added to a part of the extraction liquid every day to adjust the pH to about 2.0 to supplement the bacterial heap leaching of sulfide ore.

[0023]

[0024] The stirring and leaching conditions of copper oxide slime are as follows: the ore particle size is -1mm, take 500 grams of ore samples, strengthen stirring and leaching at room temperature, mix and leaching with the residual extraction liquid, the pulp concentration is 25%, the leaching time is 3 hours, and the copper leaching rate is 89%.

Embodiment 2

[0026] The leached copper sulfide mineral composition (%): Cu 0.51, Fe 3.59, S 3.43, copper oxide mineral composition (%): Cu 6.06, Fe 15.60, S 20.00.

[0027]

[0028] At this time, the pH of the extraction residue is significantly lower than the PH value of the spray solution required by the bacterial leaching process, which affects bacterial activity. Therefore, a part of the extraction residue is adjusted to about 2.0 by adding water every day to supplement the bacterial heap leaching of sulfide ore.

[0029]

[0030]The stirring and leaching conditions of copper oxide slime are as follows: the particle size of the slime is -1mm, take 500 grams of ore samples, strengthen the stirring and leaching at room temperature, and use the remaining extraction liquid to adjust the slurry for leaching. The slurry concentration is 30%, leaching for 2 hours, and the copper leaching rate is 86%.

Embodiment 3

[0032] The leached copper sulfide mineral composition (%) Cu 0.71, Fe 4.04, S 3.93, the copper oxide mineral composition (%) Cu 7.47, Fe 18.12, S 0.28.

[0033]

[0034] At this time, the pH of the extraction liquid is significantly lower than the pH value of the spray liquid required by the bacterial leaching process, which affects the activity of bacteria. Therefore, a part of the extraction liquid is adjusted to about 2.0 by adding water every day, and used as a sulfide mineral agent.

[0035]

[0036] Copper oxide slime heap leaching conditions are as follows: slime size -1mm, take 500 grams of ore sample, intensify stirring and leaching at room temperature, mix and leaching with extraction residue, pulp concentration 40%, leaching for 3 hours, copper leaching rate 91.45%.

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Abstract

A process for extracting copper from the mixture-type copper ore of copper sulfide ore and copper oxide ore includes such steps as respectively cracking, bacterial stacking extracting of one ore, washing, stirring and stacking extracting to another, extracting the extracted liquid, conventional back extracting to carried organic phase, and electrodepositing to obtain high-purity cathode copper. Its advantages are high recovery rate, low cost and no pollution.

Description

(1) Technical field [0001] The invention relates to a method for extracting copper from copper ore in the field of metallurgy, in particular to a method for extracting copper from low-grade mixed type copper ore. (2) Background technology [0002] So far, there are only two methods for extracting copper from mixed copper ores containing copper sulfide minerals and copper oxide minerals: one is pyrometallurgy, that is, using conventional flotation processes on copper sulfide ores to obtain copper Concentrate, while sulfidation flotation or segregation method is used for copper oxide ore to obtain copper concentrate, and then pyrometallurgy and electrolytic purification are used for copper concentrate to obtain electrolytic copper. Using this method to treat mixed type copper ore has problems such as complex process, large investment, large transportation volume, high cost, serious pollution of the environment by the flue gas produced by roasting acid, low extraction rate of c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/18
CPCY02P10/20
Inventor 陈景河曾宪辉巫銮东邹来昌
Owner ZIJIN MINING GROUP
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