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Method for bioleaching metal containing sulphidic materials

A technology of biological leaching and sulfide, applied in the direction of improving process efficiency, etc., can solve unexpected problems and achieve the effect of cost reduction

Active Publication Date: 2008-05-14
BOLIDEN MINERAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] In the heap leaching methods described above, such control is largely undesired due to the simpler and leaner ore types that are actually leached and, therefore, such leaching is usually done very thoroughly

Method used

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  • Method for bioleaching metal containing sulphidic materials
  • Method for bioleaching metal containing sulphidic materials
  • Method for bioleaching metal containing sulphidic materials

Examples

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Embodiment Construction

[0028] figure 1 A sketch of the general approach is shown in , where the concentrate / ore is first supplied in the form of a mainstream to a conventional bioleaching circuit for partial oxidation (bulk oxidation) with a culture suitable for this purpose. This partial oxidation can leach more lightly oxidized components such as zinc or arsenic. Alternatively the main flow may be fed directly or via a dehydration step to the subsequent main circuit, ie the leaching circuit of controlled biooxidation. A portion of the main flow is directed before or immediately after the preparative bioleaching loop and to a side loop consisting of a biogenerator producing biomass suitable for the controlled biomass in the main loop Oxidation, ie the amount of microorganisms with suitable type and amount. Alternatively, an external material of a different type than the material in the main flow may make up, in whole or in part, the incoming flow of this circuit. In the biogenerator, the materia...

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Abstract

The invention relates to a method for a continuous bioleaching of a metal containing sulphidic materials. Such a material in the form of a pulp or slurry is fed to a main circuit, where a bioleaching is performed in one or more stages with a culture of microorganisms which is suitable as regards the ingoing materials. A material having the ability to promote growth of microorganisms suitable for the bioleaching in the main circuit is fed to a side circuit for the generation of such microorganism. The content from the side circuit is fed to the main circuit in a predetermined flow so that an activity high enough is obtained in the culture in this circuit also at staying times shorter than the critical as should prevail without such an addition. The leaching in the main circuit is, thus, allowed to be controlled of the oxidation degree and temperature, so that a selective oxidation of different ingoing materials is allowed as well as the achievement of a predetermined oxidation ratio of the outgoing material from the main circuit. A separated leaching residue from this material is withdrawn having an oxidation ratio suitable for a following metal winning process.

Description

technical field [0001] The present invention relates to a method for continuous bioleaching of metal-containing sulfide materials. Background technique [0002] The leaching of sulphide materials, such as ores and ore concentrates, has long been known in the presence of oxygen and microorganisms, in the form of various types of bacteria and other Like microorganisms, the microorganisms are capable of advantageously oxidizing sulfur and iron and other metals in materials. This type of leaching is known as bioleaching. [0003] For example, valuable metals can be leached and brought into solution by bioleaching, and the resulting solution can then be treated to selectively obtain valuable metals such as copper, nickel, cobalt, uranium and zinc. However, noble or precious metal contents that cannot be recovered directly by this leaching method, such as those in high melting point materials such as pyrite and arsenopyrite, can also be recovered by first dissolving Any surroun...

Claims

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Application Information

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IPC IPC(8): C22B3/18C12S99/00
CPCC22B15/0067C22B3/18Y02P10/20C22B11/04
Inventor J·-E·森德奎斯特
Owner BOLIDEN MINERAL
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