Moderate thermophilic enriched substance used for mineral leaching of copper pyrites

A moderately thermophilic and enrichment technology, applied in the direction of microorganism-based methods, microorganisms, biochemical equipment and methods, etc., can solve problems such as slow progress, achieve faster reaction speed, increase bioleaching rate and leaching rate, The effect of shortening the leaching cycle

Inactive Publication Date: 2009-10-21
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, domestic research has been slow

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  • Moderate thermophilic enriched substance used for mineral leaching of copper pyrites
  • Moderate thermophilic enriched substance used for mineral leaching of copper pyrites

Examples

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Embodiment 1

[0011] Example 1 The collection, cultivation and domestication of the moderate thermophilic enrichment of the present invention

[0012] Prepare liquid medium (or claim B-type medium) to consist of: (NH 4 ) 2 SO 4 3.0g / L, Na 2 SO 4 2.1g / L, MgSO 4 ·7H 2 O 0.5g / L, K 2 HPO 4 0.05g / L, KCl 0.1g / L, Ca(NO 3 ) 2 0.01g / L, 0.1g / L yeast powder, the rest is water.

[0013] Pit water was collected from the Dexing copper mine in Jiangxi, China, the Dabaoshan mine in Guangdong, and the lead-zinc mine in Chenzhou, Hunan. Then these pit waters were mixed together, centrifuged for 2 minutes by a low-speed centrifuge (3000r / min) to remove impurities, and the supernatant was collected. Put the supernatant in a 3L shake flask, add B-type medium, 10g / L ferrous sulfate and 2g / L elemental sulfur, and culture in a shaker at 200r / min at 48°C. When the concentration of microorganisms in the solution reaches 10 8 cells / ml for subculture.

[0014] In addition to 10g / L ferrous sulfate and 2g / ...

Embodiment 2

[0018] Embodiment 2 chalcopyrite ore leaching test 1

[0019] Taking the chalcopyrite produced in Meizhou, Guangdong as the ore sample, the particle size of the ore particles is less than 75 μm, and the composition of the ore sample is shown in Table 1.

[0020] Table 1 Mineral Phase Analysis of Chalcopyrite (Meizhou, Guangdong) Concentrate

[0021]

[0022] Acid leaching was carried out on the ore sample in a glass cylindrical reactor with a cover, and 1800mL of B-type medium was added to inoculate the moderately thermophilic enrichment, the inoculation amount was 10%, and the pulp concentration was 80g / L. The mechanical stirring speed is 500 rpm. The reactor was placed in a constant temperature bath at 48°C with an initial pH value of 2.0. The acid consumption in the leaching process is supplemented by 10mol / L sulfuric acid, and the water lost by evaporation is supplemented by continuous flow of distilled water through a peristaltic pump. After the leaching, the clarif...

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Abstract

The invention discloses a moderate thermophilic enriched substance used for mineral leaching of copper pyrites, comprising five mineral leaching microorganisms: acidithiobacillus caldus S2, leptospirillum ferriphilum YSK, sulfobacillus acidophilus ZW-1, sulfobacillus thermosulfidooxidans YN22 and ferroplasma thermophilum L1; the pH value and the temperature which are most suitable for the growth of the enriched substance are respectively 1.4-2.0 and 45-48 DEG C. Compared with the existing microorganisms used for brass bio-heap leaching, the enriched substance not only improves the leaching reaction kinetics and shortens the leaching period, but also reduces the passivation inhibition phenomenon and increases the bioleaching speed and the leaching rate of the copper pyrites; furthermore, the enriched substance can endure high concentration metallic ion at the late stage of bioleaching.

Description

technical field [0001] The invention relates to biometallurgy or bioleaching technology, in particular to enrichment for bioleaching copper. Background technique [0002] Chalcopyrite is a primary sulfide ore that accounts for 70% of copper ore resources in my country. Because chalcopyrite is an insoluble primary sulfide ore with high lattice energy, it has certain difficulties in chemical leaching and biological leaching. In addition, the extracellular polymers produced during the bioleaching process of chalcopyrite, ferropotassium vanadium, ferrovanadium yellowamine, elemental sulfur and some insoluble leaching by-products are wrapped on the surface of chalcopyrite minerals, which together constitute the mineral’s passivation film. It is speculated that this passivation film greatly hinders the absorption of nutrients and oxygen in the solution by the adsorbing microorganisms, and at the same time prevents the metal ions decomposed on the mineral surface from reaching the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N1/20C22B3/18C22B15/00C12R1/01
Inventor 邱冠周曾伟民周洪波刘学端徐竞
Owner CENT SOUTH UNIV
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