Heap leaching is the most common method for bioleaching and is mainly used for secondary copper ores. Stirred tank leaching is used for refractory gold concentrates where gold is locked into the pyrite/arsenopyrite matrix.
As the microbes do not necessarily need to contact the valuable metal-bearing material that is bioleached, they can be physically separated from it:
• Direct bioleaching. The microbes are kept together with the valuable metal-bearing material
• Indirect bioleaching. The microbes are kept in a pond external to the valuable metal-bearing material and provide the leaching chemicals at a distance.
Bioleaching involves abiotic and biotic reactions, often with different physicochemical requirements. Indirect bioleaching is a way of satisfying the requirements independently by separating the biotic and abiotic reactions. In direct bioleaching the challenge is to select microbes whose living conditions are as close to the optimal conditions of the abiotic leaching reactions as possible.
Our team is well versed with the Bioleaching standards to offer competitive services to customers.
Please contact us on firstname.lastname@example.org for Bioleaching.