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One used in the heap leaching process fe 2+ Biological contact oxidation tank and method for oxidation

The technology of biological contact and heap leaching method is applied in the field of biological contact oxidation tank, which can solve the problems of difficult to regulate the growth environment, difficult to achieve high-efficiency oxidation of microbial mass reproduction and growth, difficult to achieve high redox potential of the system, and the like. The effect of improving microbial activity and mineral oxidation rate and easy control of process parameters

Active Publication Date: 2017-05-17
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, according to the characteristics of the ore heap and the growth characteristics of acidophilic iron-oxidizing bacteria, it is difficult to control the optimal growth environment (dissolved oxygen, nutrients, etc.) are not the same, it is difficult to achieve a large number of microbial growth and Fe 2+ It is difficult to achieve a high oxidation-reduction potential in the system due to the high-efficiency oxidation, but it is more feasible to solve the problem of microbial activity from outside the reactor

Method used

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  • One used in the heap leaching process fe <sup>2+</sup> Biological contact oxidation tank and method for oxidation
  • One used in the heap leaching process fe <sup>2+</sup> Biological contact oxidation tank and method for oxidation
  • One used in the heap leaching process fe <sup>2+</sup> Biological contact oxidation tank and method for oxidation

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Embodiment 1

[0038] A large part of the refractory gold ores is pyrite-coated gold, but due to the insufficient biooxidation rate of pyrite, this part of gold is difficult to be effectively exposed, resulting in low heap leaching efficiency and long production cycle, so Improving the oxidation efficiency of pyrite is of great significance for improving production efficiency and reducing production costs.

[0039] In the industrial test of bioheap leaching pre-oxidation of a low-grade refractory gold mine (the process flow is as follows Figure 4 ), the ore contains 5.3% sulfur, 0.2% arsenic, and 2.3g / t gold. The ore is crushed to a particle size of less than 20mm, and a gold-bearing pyrite leaching pile is constructed with a height of 10 meters. In the initial stage of heap leaching, acidophilic iron oxidizing bacteria were enriched and cultivated from local acidic wastewater (medium composition: 9K, 10g / LFeSO 4 , pH1.8), mainly including Leptospira ferrooxidans and Thiobacillus ferrooxi...

Embodiment 2

[0043] In the bioheap leaching industrial test of a low-grade secondary copper ore (the process flow is as follows Figure 6 ), the ore composition is Cu0.37%, Fe3.59%, S5.28%. The main copper minerals in the ore are chalcocite, copper blue and chalcocite, of which chalcocite accounts for more than 90% and pyrite content is 10%. The main gangue minerals are feldspar, quartz and sericite. After the secondary copper ore is crushed to a particle size of less than 40mm, a copper ore leaching heap is constructed. In the test production stage, local acidic wastewater was used to continuously spray the copper ore leaching heap. The pH of the acidic wastewater was 2.1, the total iron content was 3g / L, and the Eh was 690mV. However, due to the high acid consumption of the ore pile during the production process, the acidity of the spray liquid is not enough, and the production efficiency is low. In the test, a biological contact oxidation pond (volume of 1,000 cubic meters and depth o...

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Abstract

The invention discloses a biological contact oxidation pond and a method for oxidizing Fe<2+> in a dump leaching process. The biological contact oxidation pond comprises a ferrous oxidation tank, wherein a support is arranged in the ferrous oxidation tank, a microbial carrier is arranged on the support, and an aeration pipeline is arranged at the bottom of the ferrous oxidation pond. According to the biological contact oxidation pond and the method for oxidizing the Fe<2+> in the dump leaching process, in the ferrous oxidation tank, microbes adsorbed by the microbial carrier are taken as a main body, the microbes are promoted to efficiently oxidizing Fe<2+> to generate Fe<3+> in the biological contact oxidation tank by aerating and controlling appropriate temperature, pH and nutritional conditions, high microbial activity in a dump leaching system and high oxidation reduction potential in solution are realized, and oxidation efficiency of sulphide ore is improved.

Description

technical field [0001] The invention relates to the field of biometallurgy, in particular, the invention relates to a method for Fe in the heap leaching process 2+ Biological contact oxidation tank and method for oxidation. Background technique [0002] During bioheap leaching, the growth of acidophilic microorganisms in the heap leaching system directly affects the Fe 2+ Oxidized to Fe 3+ Ability. However, due to the harsh environment in the heap leaching system, the lack of nutrients and oxygen, the number and activity of microorganisms in the ore heap are limited, and the 2+ Insufficient oxidation, affecting the oxidant Fe 3+ regeneration, which in turn has a great impact on the actual application effect. Previous studies have proved that the oxidation rate of sulfide ore is mainly affected by dissolved oxygen, redox potential and microbial activity in the ore heap. In the absence of sufficient microbial activity, the iron element in the system is mainly Fe 2+ Exis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/18
CPCY02P10/20
Inventor 阮仁满贾炎
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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