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Bringing order to chaotic bubbles can make mining more sustainable

A new technique can structure bubbles by vibrating particles

Date:
August 23, 2021
Source:
Columbia University School of Engineering and Applied Science
Summary:
A new way to control the motion of bubbles might one day help separate useful metals from useless dirt using much less energy and water than is currently needed.
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A new way to control the motion of bubbles from researchers at Columbia Engineering might one day help separate useful metals from useless dirt using much less energy and water than is currently needed.

When mining for metals such as the copper used in most electronics and the lithium used in many batteries, only a small fraction of the material that is mined is useful metal, with the vast majority just useless dirt-like particles.

"We have to separate the useful metals from the useless particles, and we do this by blowing air bubbles up through them," said Chris Boyce, assistant professor of chemical engineering at Columbia Engineering. However, "this process utilizes a large amount of energy and water, causing climate change and water shortages, thus creating problems we are trying to prevent. We have this issue in part because we currently cannot control the motion of these bubbles."

Now Boyce and his colleagues reveal that if they vibrate these particles while blowing air up through them, the normally chaotic motion of these bubbles becomes orderly and controllable. The vibrations cause the particles to quickly shift between solid-like to fluid-like behavior, which in turn helps structure the bubbles into regularly spaced triangular arrays.

"I think the simple addition of vibration to go from chaos to order is beautiful," Boyce said. Their study appears August 23 in the journal Proceedings of the National Academy of Sciences.

Having a way to control the behavior of these bubbles can help scale up and optimize separation techniques. "We expect that the ability to create structure in flows can reduce energy and water use in mining as well as improve the efficiency of many clean energy processes," Boyce said.

The researchers now aim to apply this structured bubbling to sustainable mining separation techniques.


Story Source:

Materials provided by Columbia University School of Engineering and Applied Science. Note: Content may be edited for style and length.


Journal Reference:

  1. Qiang Guo, Yuxuan Zhang, Azin Padash, Kenan Xi, Thomas M. Kovar, Christopher M. Boyce. Dynamically structured bubbling in vibrated gas-fluidized granular materials. Proceedings of the National Academy of Sciences, 2021; 118 (35): e2108647118 DOI: 10.1073/pnas.2108647118

Cite This Page:

Columbia University School of Engineering and Applied Science. "Bringing order to chaotic bubbles can make mining more sustainable." ScienceDaily. ScienceDaily, 23 August 2021. <www.sciencedaily.com/releases/2021/08/210823151028.htm>.
Columbia University School of Engineering and Applied Science. (2021, August 23). Bringing order to chaotic bubbles can make mining more sustainable. ScienceDaily. Retrieved March 28, 2024 from www.sciencedaily.com/releases/2021/08/210823151028.htm
Columbia University School of Engineering and Applied Science. "Bringing order to chaotic bubbles can make mining more sustainable." ScienceDaily. www.sciencedaily.com/releases/2021/08/210823151028.htm (accessed March 28, 2024).

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