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Metal ore heap leaching, anaerobic enrichment transformation and biological leaching extraction process

A bioleaching and extraction technology, applied in the direction of improving process efficiency, can solve problems such as difficulty in directly obtaining high-concentration metal sulfate solution, endangering the ecological environment and human health, and low-grade metal ore, so as to reduce heap leaching operations Effects of strength, reduced storage capacity, and shortened heap leaching cycle

Inactive Publication Date: 2012-07-04
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current biometallurgical process has the following problems: (1) Most of the metal ores treated by heap leaching are low-grade, so it is difficult to directly obtain a high-concentration metal sulfate solution, and the heap leaching cycle is very long
(2) A large amount of low-concentration heap leaching residual solution has brought great pressure to local environmental protection due to its low industrial value
[0004] On the other hand, under the action of air, water, and microorganisms, metal ores will oxidize and decompose in a natural state, and bioleaching occurs, resulting in acidification of water bodies and the release of heavy metal elements, forming acid mine water, which seriously endangers the ecological environment and human health.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Taking copper sulfide ore as an example, it can be implemented as follows:

[0023] (A) Open-air heap leaching: the mined low-grade metal ore or tailings are piled in the heap leaching site, and the ore pile is sprayed with pH=1.5 containing Thiobacillus ferrooxidans, Leptospira ferrooxidans, hibiscus 9K medium for Thiobacillus mesophilus and Sulfolobus metallobus (contains per liter: (NH 4 ) 2 SO 4 1.5g, KH 2 PO 4 0.25g, MgSO 4 ·7H 2 O 0.25g and CaCl 2 2H 2 O 0.01g, supplemented with 0.2g yeast extract), to obtain a metal sulfate solution with a concentration of 100-500mg / L (generally mixed with various metals, depending on the nature of the ore).

[0024] (B) Anaerobic concentration conversion: the metal sulfate solution of lower concentration that step (A) obtains, after replenishing carbon source, energy, utilizes the anaerobic bacteria that sulfate-reducing bacteria is main in anaerobic bioreactor Metal sulfate is transformed into metal sulfide, and a mi...

Embodiment 2

[0028] Taking copper sulfide ore as an example, it can be implemented as follows:

[0029] (A) Open-air heap leaching: the mined low-grade metal ore or tailings are piled in the heap leaching site, and the ore pile is sprayed with pH=1.5 containing Thiobacillus ferrooxidans, Leptospira ferrooxidans, hibiscus 9K medium for Thiobacillus mesophilus and Sulfolobus metallobus (contains per liter: (NH 4 ) 2 SO 4 1.5g, KH 2 PO 4 0.25g, MgSO 4 ·7H 2 O 0.25g and CaCl 22H 2 O 0.01g, supplemented with 0.2g yeast extract), to obtain a metal sulfate solution with a concentration of 100-500mg / L (generally mixed with various metals, depending on the nature of the ore).

[0030] (B) Anaerobic concentration conversion: This step is subdivided into two stages of sulfide precipitation and sulfate biological reduction.

[0031] Sulfide precipitation process: the lower concentration metal sulfate solution obtained in step (A) is mixed with the solution containing divalent sulfur anion o...

Embodiment 3

[0036] Taking copper sulfide ore as an example, it can be implemented as follows:

[0037] (A) Open-air heap leaching: the mined low-grade metal ore or tailings are piled in the heap leaching site, and the ore pile is sprayed with pH=1.5 containing Thiobacillus ferrooxidans, Leptospira ferrooxidans, hibiscus 9K medium for Thiobacillus mesophilus and Sulfolobus metallobus (contains per liter: (NH 4 ) 2 SO 4 1.5g, KH 2 PO 4 0.25g, MgSO 4 ·7H 2 O 0.25g and CaCl 2 2H 2 O 0.01g, supplemented with 0.2g yeast extract), to obtain a metal sulfate solution with a concentration of 100-500mg / L (generally mixed with various metals, depending on the nature of the ore).

[0038] (B) Anaerobic concentration conversion: This step is subdivided into two stages of sulfide precipitation and sulfate biological reduction.

[0039] Sulfide precipitation process: the lower concentration metal sulfate solution obtained in step (A) is mixed with the biogas containing hydrogen sulfide obtaine...

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Abstract

The invention relates to a metal ore heap leaching, anaerobic enrichment transformation and biological leaching extraction process, which comprises the following steps: utilizing metal sulphate solution with low concentration obtained in the open-air heap leaching operation and treating through a sulfate reduction bacteria process (anaerobic bioreactor) to obtain a metal sulfide precipitate (solid); and obtaining metal sulphate solution with high concentration through bio-leaching (bio-leaching reactor). The invention has the beneficial effects that the environmental risk of external leakage of leaching solution is reduced, the heap leaching period is shortened, the storage capacity of a heap leaching field is greatly reduced, the environmental risk caused by accidental leakage is reduced, and the concentration of metal ions in treated waste liquid is kept below dozens of micrograms per liter so as to be lower than the current environment protection standard requirements.

Description

technical field [0001] The invention is a novel biometallurgical method for obtaining high-concentration metal sulfate solution by using microorganisms to treat low-grade metal ores. In the process of mining, selecting and smelting metal ores, heap leaching, anaerobic conversion and concentration, bioleaching, etc. are comprehensively utilized. 3 biotechnological approaches to obtain highly concentrated metal sulfate solutions. Background technique [0002] At present, the grades of various metal mine minerals are declining day by day, and the application of biometallurgy technology is becoming more and more extensive. For example, in low-grade copper sulfide mines, people use sulfur-oxidizing and / or iron-oxidizing microorganisms such as iron-oxidizing bacteria to leach copper sulfide ore by heap leaching. After removing impurities, the leaching solution is concentrated to obtain a high-concentration copper sulfate solution. Electrowinning and other technologies can obtain ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/18
CPCY02P10/20
Inventor 肖隆文陈火平匡敬忠陈明梁长利
Owner JIANGXI UNIV OF SCI & TECH
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