Method of eliminating passivation film for chalcopyrite at lixiviating course by sulfur oxidizing bacteria

A technology for sulfur-oxidizing bacteria and chalcopyrite, which is applied in the direction of improving process efficiency, can solve the problems of low reaction rate, low leaching rate, and limited industrialization and wide application of bioleaching chalcopyrite, and achieves easy colonization and leaching rate. High, short cycle effect

Inactive Publication Date: 2008-08-27
CENT SOUTH UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The low reaction rate and low leaching rate of bioleaching chalcopyrite limit its wide application in industrialization

Method used

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  • Method of eliminating passivation film for chalcopyrite at lixiviating course by sulfur oxidizing bacteria
  • Method of eliminating passivation film for chalcopyrite at lixiviating course by sulfur oxidizing bacteria
  • Method of eliminating passivation film for chalcopyrite at lixiviating course by sulfur oxidizing bacteria

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1. adopts the compound strain that thermophilic Thiobacillus bacterium and Leptospira ferrophilic bacteria concentration ratio is 1: 1 under the condition of 35 ℃, 40 ℃, 45 ℃ and 50 ℃ to chalcopyrite concentrate (composition Analysis see table 1) Carry out 10L stirred tank leaching experiment. The copper content of the ore sample is 29.06%, the iron content is 25.96%, and the sulfur content is 30.46%, mainly primary chalcopyrite. The slurry concentration is 2%, and the bacterial concentration after inoculation is 1×10 7 cells / mL, the initial pH value is 1.6, and the rotation speed is 500rpm. Determination of Cu in Chalcopyrite Leaching Solution by Atomic Absorption Spectrometry 2+ content, and replenish the evaporated water with distilled water at regular intervals. Two groups of parallel experiments. The leaching results after 20 days are shown in Table 2.

[0016] The mass percentage content of the main component of chalcopyrite used in table 1

[001...

Embodiment 2

[0021] Embodiment 2. adopting thermophilic Thiobacillus bacterium and the concentration ratio of Leptospira ferrophilic bacteria are respectively 1: 1 / 2, 1: 1 and 1: 2 middle and high temperature compound strains to carry out 10L stirring to chalcopyrite concentrate Tank leaching experiments. The composition of the ore sample is as above. The pulp concentration is 2%, and the bacterial concentration after inoculation is 1~2×10 7 pieces / mL, the leaching temperature is 45°C, the initial pH value is 1.6, and the rotation speed is 500-600rpm. Determination of Cu in Chalcopyrite Leaching Solution by Atomic Absorption Spectrometry 2+ content, and replenish the evaporated water with distilled water at regular intervals. At the same time, chalcopyrite was leached by pure bacteria of Leptospira ferrophilum as a control. The leaching results after 20 days are shown in Table 3.

[0022] Table 3 Comparison of leaching rate and leaching rate of chalcopyrite leached by composite bacter...

Embodiment 3

[0026] Embodiment 3. Adopting the middle and high temperature composite bacterial species that the concentration ratio of thermophilic Thiobacillus bacteria and Leptospira ferrobacterium bacteria is 1:2 carries out 10L of chalcopyrite concentrate that the pulp concentration is 1%, 3% and 5%. Stirred tank leaching experiments. The composition of the ore sample is as above. The bacterial concentration after inoculation was 1~2×10 7 pieces / mL, the leaching temperature is 45°C, the initial pH value is 1.6, and the rotation speed is 500-600rpm. Determination of Cu in Chalcopyrite Leaching Solution by Atomic Absorption Spectrometry 2+ content, and replenish the evaporated water with distilled water at regular intervals. The leaching results after 20 days are shown in Table 4.

[0027] Table 4 Comparison of chalcopyrite leaching rate and leaching rate under different pulp concentrations

[0028]

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Abstract

The invention discloses a method to remove passivating film on the surface of copper pyrite with sulfur oxidizing bacteria during the course of microbial immersion ore, which is characterized by the following: screening acidophilic and thermophilic thiobacillus bacteria; forming recombination bacterial with iron hook end spirillum; improving the dipping speed and dipping ratio of copper pyrite greatly compared to composite bacterial and pure iron hook end spirillum; collecting elemental sulfur on the surface of copper pyrite generated by metabolism of iron-oxidizing bacteria; forming passivating film to prevent further extraction; oxidizing elemental sulfur to sulfur acid under existion of sulfur oxidizing bacteria; accelerating the dissolvent of copper pyrite. This technology can be used to exploit above 70% copper pyrite of our country.

Description

[technical field] [0001] The present invention relates to a kind of composite strain that uses sulfur oxidizing bacteria and iron oxidizing bacteria to eliminate the passivation film formed on the chalcopyrite surface due to the metabolism of iron oxidizing bacteria in the process of microbial leaching, thereby improving the copper leaching rate and leaching rate method. [Background technique] [0002] The modern industrial application of biometallurgy mainly has two aspects: the bioleaching of copper sulfide ore began in the 1950s; the pre-oxidation technology of refractory gold ore has been widely used in the gold industry for more than 20 years. At present, almost all sulfide ores such as uranium, manganese, lead, nickel, cobalt, zinc, arsenic, and iron can be leached by bacteria. Chalcopyrite, which accounts for more than 70% of my country's copper ore resources, is the most difficult primary sulfide mineral to be oxidized by bacteria. Especially in the process of bact...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/18C22B15/00
CPCY02P10/20
Inventor 邱冠周周洪波符波曾伟民柳建设刘晰刘飞飞
Owner CENT SOUTH UNIV
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