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MEI Online: Commodities: Metallic Ores: Gold: Latest News: August 30th 2005


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:: Peruvian Mine Orders R1-million Mintek Furnace

Mintek has received a R1-million order for a 125 kg/h Minfurn (carbon-regeneration furnace) from Compañia Minera San Simón SA in Peru.

This will be the second installation of the higher-capacity Minfurn, which was designed specifically after several companies had shown interest in a larger unit.

Minera San Simón currently has a 42 kg/h Minfurn, which was commissioned in May 2005. The larger Minfurn has a capacity comparable with conventional regeneration equipment such as rotary kilns, while retaining the advantages of the unique resistive-heating technology employed in the Minfurn, which results in a simpler construction and higher energy efficiency.

The Minfurn is a novel piece of equipment used in the carbon in pulp (CIP) and carbon in solution (CIS) gold recovery processes. Specially designed and developed by Mintek for the regeneration of activated carbon, the furnace uses a process of direct resistive heating.

In CIP gold recovery process, which Mintek also developed in close collaboration with the South African mining industry, activated-carbon or charcoal is used to adsorb the gold directly from the pulped ore in large tanks.

With every adsorption cycle in the CIP process, the activated carbon loses some of its ability to adsorb gold, owing to contamination by organic materials. Thermal regeneration decomposes these materials and restores the original activity of the carbon, thereby maintaining adsorption efficiency and minimising the loss of soluble gold.




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