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Microbial composite treatment for gold ore tailings and application method

A technology of composite treatment and application method, applied in the field of microbial composite treatment and application of gold tailing slag, can solve the problems of low production efficiency, little effect of gold tailing slag production speed, serious environmental pollution, etc., and achieves good biocompatibility, Effectively remove cyanide without secondary pollution

Inactive Publication Date: 2018-06-29
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] Technical problems: The existing gold tailings slag treatment technology has technical problems such as serious environmental pollution, high investment, low production efficiency, large investment, high energy consumption, high cost, and ineffective industrial application. It is difficult to achieve large-scale and large-scale production Compared with the production rate of gold tailings slag, it has little effect

Method used

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  • Microbial composite treatment for gold ore tailings and application method

Examples

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Effect test

Embodiment 1

[0046] In this example, the gold tailings slag microbial composite treatment and application method is used to treat the tailings slag foundation, and the method includes the following steps:

[0047] (1) Grinding: crushing and grinding the agglomerated tailings slag;

[0048] (2) Bacterial strain collection and cultivation: Collect cyanide-reducing bacteria from the surface soil near the tailings slag containing cyanide in the tailings pond, put them into the liquid medium, and inoculate Bacillus pasteurianus in it, and separate them by streaking and different gradients After the domestication and cultivation of the cyanide-containing culture solution, the strains are expanded step by step to obtain the domesticated composite flora, which consists of Bacillus pasteurii, Bacillus subtilis, Bacillus pumilus ) or one or a combination of Bacillus megaterium. 1L of liquid medium contains 5.0g of soybean peptone, 15.0g of tryptone, 5.0g of sodium chloride and 10g of urea. The pH o...

Embodiment 2

[0059] In this example, the gold tailings slag microbial composite treatment and application method is used to treat the tailings slag foundation, and the method includes the following steps:

[0060] (1) Grinding: crushing and grinding the agglomerated tailings slag;

[0061] (2) Bacterial strain collection and cultivation: Collect cyanide-reducing bacteria from the surface soil near the tailings slag containing cyanide in the tailings pond, put them into the liquid medium, and inoculate Bacillus pasteurianus in it, and separate them by streaking and different gradients After the domestication and cultivation of the cyanide-containing culture solution, the strains are expanded step by step to obtain the domesticated composite flora, which consists of Bacillus pasteurii, Bacillus subtilis, Bacillus pumilus ) or one or a combination of Bacillus megaterium. 1L of liquid medium contains 5.0g of soybean peptone, 15.0g of tryptone, 5.0g of sodium chloride and 10g of urea. The pH o...

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Abstract

The invention discloses a microbial composite treatment for gold ore tailings and an application method and belongs to the field of road engineering. According to the method, Bacillus pasteurii is compounded with one or more of Bacillus subtilis, Bacillus pumilus or Bacillus megaterium, so that by means of the Bacillus pasteurii, CaCO3 crystal is deposited and generated in the gaps in the gold oretailings, thus improving mechanical performance and stability and immobilizing heavy metal and noble metal ions in the gold ore tailings. The Bacillus pumilus or Bacillus megaterium can decompose thecyanides in the gold ore tailings. Through mechanical ploughing and multi-round slurry injection, the microorganisms, the gold ore tailings and a cemented liquid are fully mixed and contacted with each other, so that purposes of generating the CaCO3 crystal for reinforcing the gold ore tailings and degrading the cyanides can be achieved. The method has no secondary pollution, is low-cost, is simple and is high in resource utilization rate, and can achieve multi-channel large-scale recovery utilization of the tailings.

Description

technical field [0001] The invention relates to a microbial composite treatment and application method of gold tailings slag, which belongs to the field of road engineering. Background technique [0002] In the process of gold mining, the surrounding rocks and rocks without industrial value generated during stripping and excavation are called waste rocks. The waste residue discharged after the ore extracts the gold concentrate is the gold tailings. Gold production generally adopts cyanide gold extraction method, in which cyanide must be added, resulting in a certain amount of cyanide remaining in the tailings. Because gold tailings are mostly treated in the form of inventory, with the expansion of gold production scale and the extension of mining history, the accumulation of gold tailings has increased year by year, which not only occupies a large amount of land, pollutes the atmosphere, surface water and groundwater; Or overload use, or even illegal operation, so that the...

Claims

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Application Information

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IPC IPC(8): C12N1/20C04B5/00C12R1/07C12R1/125C12R1/11
CPCC04B5/00C12N1/20
Inventor 刘鹏程钰邵光辉
Owner NANJING FORESTRY UNIV
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