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Chementator: Reduce gas consumption with this sparging nozzle  

By Chemical Engineering |

A gas-liquid nozzle that reduces the size of the gas bubbles blown into a liquid — thus increasing the rate at which the gas is absorbed into the liquid — has been developed by a research team led by Jie Wu at CSIRO Manufacturing and Infrastructure Technology Div. (edlinks.chemengonline.com/5826-531), in collaboration with CPE Ltd (Chemical Plant & Engineering; both Melbourne, Victoria, Australia; edlinks.chemengonline.com/5826-532). Wu says the nozzle was developed after industry identified significant efficiency shortfalls when sparging gases, such as oxygen or nitrogen, into liquids — a technique commonly used in industries including gold production, mineral sands processing, pharmaceuticals manufacturing, and brewing. According to CPE, which manufactures and markets the nozzle, trials at Victoria’s Stawell Gold Mine have showed a reduction of up to 25% in the amount of O2 that escapes into the air during processing. When gas is conventionally bubbled through a liquid, most of the bubbles just rise to the surface and go into the air as waste, explains Wu. Making the gas bubbles smaller provides more surface area and therefore we can increase the rate of transfer of gas into the liquid, he says. The creation…
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