Description

This innovation consists of a new low temperature sulfide bioleaching process for high mountain and pre-mountain ranges. This process uses a consortium of new psychrotolerant strains of Acidithiobacillus ferrivorans, called Puri, Yaku and Acidithiobacillus sp., Called Uma, as inoculants.

All of them are capable of growing in low temperature ranges (5 ° C to 10 ° C), oxidize the ferrous ion and reduced sulfur compounds, and all have the ability to form biofilms on solid supports.

The generation of these biofilms allows the continuous production of an inoculant solution from fixed-bed bioreactors filled with inert support materials, colonized with the consortium of psychrotolerant bacteria.

Different groups of microorganisms, according to their optimal bioleaching temperature.

Development State

The technology is proven at the level of bioleaching columns.

Bioleaching of a copper sulphide mineral / BLX 1 y BLX2: psychotolerant consortium (7,6 °C) / BLX 4 y BLX5: mesophilic consortium (26 °C) / BLX 3: Sterile control

Applications

  • Bioleaching in piles in high mountains, pre-mountain ranges or where low temperatures occur.
  • Acid bioleaching in landfills (ROM). ROM dumps are generally freer systems, whose control is more difficult than that of a battery due to their characteristics (size, grain size, etc.)
  • Obtaining shorter starting times in traditional leaching piles.

Opportunity

In the process of obtaining minerals, particularly copper, there is the alternative of using microorganisms to extract it from sulphided materials of this mineral. This process, called bioleaching, has been gradually developed and incorporated in the industry.

For the system to be incorporated more massively, better performance is required in the mining environments of Chile. This requires having bacteria and archaeas suitable for dissolving metals and appropriate environmental conditions for their growth, with temperature being a fundamental parameter of the process.

The high mountain range climate of our country causes difficulties for this process, since it currently requires significant energy costs for the preheating of the leaching solutions and significant efforts to maintain the temperature in the piles.

Team

BIOHIDRICA

We are a research and development, consulting and marketing company for products related to the detection and control of environmental, microbiological and biomineral contamination.

 

  • Pabla Viedma Elicer, MSc
  • Pía Tobar Gómez, Biochemist
  • Dr. Manuel Guidekel Blufstein