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Biological metallurgy mineral leaching microorganism combined bacterium fluid for copper ore and method for recycling metallic copper

A technology of leaching microorganisms and biometallurgy, which is applied in the direction of improving process efficiency to achieve the effects of reducing production costs, improving resource utilization efficiency, and protecting the ecological environment

Inactive Publication Date: 2011-01-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is still no complete and suitable treatment method for copper ore, smelting slag and mining waste rock of various sizes of oxide ore and sulfide ore.

Method used

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  • Biological metallurgy mineral leaching microorganism combined bacterium fluid for copper ore and method for recycling metallic copper
  • Biological metallurgy mineral leaching microorganism combined bacterium fluid for copper ore and method for recycling metallic copper
  • Biological metallurgy mineral leaching microorganism combined bacterium fluid for copper ore and method for recycling metallic copper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] Lump heap leaching:

[0097] Lay the bottom layer and the anti-seepage layer. The bottom layer is coarse sand with a particle size of 300-400mm. On the anti-seepage layer, the pre-broken copper ore with a thickness of 200-300mm is piled up as a pile. The buffer layer of the field; continue to pile up the crushed +5-40mm copper ore large-grained lump ore in thin layers, each layer is 5-7m high, and lay 4-6 layers; first use a pH value of 0.9- The dilute sulfuric acid solution of 1.2 is pre-sprayed to ensure that the pH value of the leachate is maintained at 1.7-1.9. After the pH value of the leachate is stable for 48 hours, it is 6 cell / mL was inoculated with the above-mentioned ore leaching microorganism combination, intermittent spraying production operation and ventilation were started, and the copper leaching rate was 90.11% after heap leaching for 270 days, and a leaching solution with a copper ion concentration of 2.51g / L was obtained.

[0098] Stirring and leachi...

Embodiment 2

[0102] According to the operation of Example 1, the lump ore was heap leached for 270 days, the copper leaching rate was 94.23%, and the leaching solution with a copper ion concentration of 3.66g / L was obtained.

[0103] According to the operation powder ore bacterial agitation of embodiment 1, the average process index of continuous operation for one month is: the leaching rate of copper is 95.62%, the sulfuric acid consumption is 3.65 tons / ton copper, and the leaching solution that obtains copper ion concentration is 5.78g / L. The two parts of the leaching solution are mixed for extraction-electrodeposition process operation, and the first batch of cathode electrode copper with a purity of 99.995% is obtained.

Embodiment 3

[0105] According to the operation of Example 1, the lump ore was heap leached for 270 days, the copper leaching rate was 90.25%, and the leaching solution with a copper ion concentration of 2.45 g / L was obtained.

[0106] According to the operation powder ore bacterial stirring of embodiment 1, the average process index of continuous operation for one month is: the leaching rate of copper is 92.32%, the sulfuric acid consumption is 3.25 tons / ton copper, and the leaching solution that obtains copper ion concentration is 4.75g / L. The two parts of the leaching solution are mixed with one part to perform the extraction-electrowinning process, and the first batch of cathode electrode copper with a purity of 99.995% is obtained. Part of the leaching solution is obtained through a replacement process to obtain sponge copper with a copper content of 88%.

[0107] The specific process of obtaining sponge copper is as follows, the initial pH value of the leaching solution is adjusted to...

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Abstract

The invention discloses biological metallurgy mineral leaching microorganism combined bacterium fluid for a copper ore and a method for recycling metallic copper. The method comprises the following steps that: mineral leaching microorganisms after adaptive culture, continuous amplification culture and ore pile adaptive culture are combined and used for mineral leaching, and different leaching methods are adopted aiming at the ore of different objects, which comprise a biological metallurgy processing method for lump ores, powder ores, tailings, copper smelting slags and the like; and the obtained qualified leaching solution is used to prepare two products, namely electrolytic copper by an extraction-electrodeposition method and spongy copper by a short stage displacement method. The method has the advantages of suitability for industrial production under different conditions, efficient utilization of low-grade copper ore resources and capacity of effectively protecting the ecological environment of mine areas and achieving a win-win situation of economic benefit and environmental friendliness.

Description

technical field [0001] The invention belongs to the field of biometallurgy, and in particular relates to a biometallurgical ore leaching microbial composition bacterial liquid of copper ore and a method for recovering copper metal. Background technique [0002] Copper is an important strategic non-ferrous metal, used in electrical, machinery manufacturing, defense industry and other fields. The world's copper resources are mainly concentrated in Chile, the United States, Zambia and other countries. Zambia's copper reserves account for 6.4% of the world's total, but among the proven copper resources, a considerable number of copper mines have yet to be developed due to the lack of efficient utilization of new technologies. In particular, the large amount of tailings and mining waste rock resources stockpiled in Zambia requires a lot of government funds to maintain the waste rock piles. However, due to the lack of effective technology, a large amount of heavy metal-containing...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B15/00
CPCC22B3/18C22B15/0067Y02P10/20
Inventor 邱冠周覃文庆刘学端王军尹华群刘新星周洪波康健余润兰申丽张雁生曾伟民朱德庆李启厚庄田
Owner CENT SOUTH UNIV
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