Method for bioleaching a metal present in a material

a metal and metal technology, applied in the field of methods, can solve the problems of reducing the profitability of these processes, reducing the reliability of microbial organisms, and inhibiting the growth and/or activity of microorganisms,

Inactive Publication Date: 2016-05-19
MEURICE RECH & DEVEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]In order to at least partially solve the problems associated with the use of the current bioleaching processes, the inventors have developed a process for recovering at least one metal of interest present in a material, in which the bacterial populations used during the process are less exposed to the presence of compounds which are toxic and/or which inhibit the steps of...

Problems solved by technology

However, the processes thus described do not make it possible to obtain a high degree of recovery of the metals of interest, or the processes are relatively slow (from two to a hundred days), thus decreasing the profitability of these processes.
Thus, these processes are not satisfactory from the point of view of the yield and kinetics for recovering a not insignificant part of the metals of interest in order to make the process profitable from a technico-economic point of view.
Furthermore, some materials treated by bioleaching can comprise, depending on their nature, various compounds which can prove to be toxic and can reduce the microbial reliability and/or inhibit the g...

Method used

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Examples

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Effect test

example 1

Recovery of Copper from Brake Pad Dust

[0100]The waste treated is brake pad dust; this pulverulent material results from the automobile industry, and in particular from the steps of polishing, reaming and finishing treatment of the parts in question. The composition of the materials can vary according to the evolution of motor vehicle braking technologies and the batches of materials under consideration. The residue exploited in the context of this example has the following elemental composition as % by weight: Cu 15%, Fe 10%, Zn 2%, Mg 4.5%, Al 5%, but also Sb 0.4%, As 0.2%, Pb 0.5%, and other elements in trace amounts or in insignificant amount. The process is applicable to all types of waste described in this patent.

[0101]The bacteria exploited in this example are part of the class of iron(II)-oxidizing acidophilic bacteria: Acidiferrobacter thiooxydans (DSM 2392), Acidithiobacillus ferrooxidans (DSM 11477), Leptospirillum ferrooxidans (DSM 2391). These acidophilic bacteria have a...

example 2

Recovery of Non-Ferrous Metals, and of Noble Metals of Interest, by Bioleaching Ground Mobile Telephone Materials

[0106]This second example consists of the use of embedded acidophilic bacteria in order to leach heavy metals such as copper combined, in the structure of the waste, with noble metals such as gold. This makes it possible to bioleach the copper but also a fraction of the gold by acidolysis. This example is illustrated by the treatment of a material resulting from the grinding of mobile telephones (grinding of whole mobile telephones, of random brands and models, to an average particle size of 1 mm), with an initial concentration of Au of 221 mg / kg and of Cu of 69 g / kg. For this type of waste, it is not necessary to perform a separation or a preconditioning; however, an acidification of the waste is carried out. The addition of iron in FeSO4.7H2O form is essential given the absence of iron intrinsic to the waste. The process will therefore be carried out in two steps: oxida...

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Abstract

The invention relates to a method for recovering at least one metal present within a material, said material possibly including iron, said method including a step of supplying a ferrous ion, a step of supplying a ferric ion, and a step of bioleaching at least one metal present in the material by the ferric ions, each one of the steps being implemented by a particular bacterial population.

Description

FIELD OF THE INVENTION[0001]The invention relates to the field of biohydrometallurgy aimed at the recovery of ferrous and non-ferrous metals of interest present in a material by means of a bioleaching process. More particularly, the invention relates to an indirect bioleaching process for extracting at least one metal present in a material, and comprising the steps of supplying a ferrous ion in a first reaction space, of oxidizing the ferrous ion supplied to give a ferric ion in a second reaction space and of bioleaching said at least one metal via said ferric ion in a third reaction space.PRIOR ART[0002]Bioleaching processes consist in solubilizing metals present in the reduced or elemental state from various materials, such as ores, or solid by-products / waste resulting from the metallurgy industry, the mechanical industry, or the industry for converting or treating and recycling waste such as incinerator ash, batteries and spent catalysts, through the use of microorganisms. The me...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B3/00B22F1/00C22B1/00C22B3/08C22B15/00C21B15/00
CPCC22B3/18C22B15/0071C22B15/0065C22B11/046C21B15/00C22B1/005B22F2304/10B22F1/0003B22F2009/245B22F9/24B22F2301/10B22F2301/255B22F2301/35C22B3/08Y02P10/20B22F1/00
Inventor NICOLAY, XAVIERVAUCHEL, KARINE
Owner MEURICE RECH & DEVEMENT
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