Microbes for Industrial Metals Processing
“We’re making real progress in finding better ways to more sustainably separate valuable ores such as copper, iron, lead and zinc,” she said. “At the moment we’re mixing together pure minerals of known quantities and purity and studying the effects.”
Harmer’s team used high-tech x-ray imaging and micro-spectroscopic methods to study the distribution of chemical species responsible for selective attachment of bacteria and the separation of metals. They also used extreme light beams in synchrotrons to pinpoint the chemical mechanisms of bioleaching of copper ore, using soft and hard x-ray spectroscopies.
Harmer said it was critical to make the technology cost effective on a larger scale for commercial use in the mining industry. “That’s what has really slowed the adaption of using microbes and different types of bacteria for minerals processing. They’ve only been done on a small scale in the past due to the cost,” she said. She added that the new technology has the potential to replace toxic chemicals such as cyanide currently used to separate minerals from ore.
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