Regarding the speed of gravitational settling
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Material description: The oxidized graphite slurry is obtained via redox method. The oxidized graphite is flaky, with a sheet diameter of 10 μm and a layer thickness of 10 nm. This material is separated using gravity sedimentation, and the longest sedimentation period observed was over 15 days. Due to the need for multiple dilutions and sedimentation processes, as well as the slow rate of gravitational sedimentation, the product production cycle is prolonged; sedimentation has become a bottleneck in the entire production system, limiting production capacity. Various tests have also been conducted recently, but there has been no substantial improvement in the settlement rate. I’m asking fellow sailors: what factors affect the gravity settling speed? Regarding the gravitational settlement of such products, thank you for providing various suggestions for improvement. :handshake
Consider centrifugal sedimentation: the product particles are small, have a large specific surface area and high surface tension, making sedimentation difficult. According to Stokes’ law, when the solid phase remains constant, sedimentation is accelerated only by using a liquid phase with low viscosity and a low-density liquid. The sedimentation rate in centrifugal sedimentation can be several hundred to several thousand times that of gravitational sedimentation.
The principle is feasible, but how large must the centrifugation equipment be?
It’s sufficient to purchase a filtering device from abroad; it can capture 99.5% of particles larger than 50nm
The centrifugal filtration speed should be 10,000+ revolutions per minute; currently, centrifugal filtration is only used for small batches.
Filtering cannot be used; centrifugal sedimentation is required!
Supergravity sedimentation can be used; the equipment is simple, making enrichment easy