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

[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...

[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...

[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...