Effects of Particle Sizes in Vibrating Screens (Continued)

June 8, 2018

Last time around, there was talk of particle size and gravity. Inclination angles were discussed, and then stratification patterns were considered. This time around, let’s support the case studies with science. In particular, mineral grain size is regarded as a science by mining engineers. They attach mathematical values to the average shape and dimensions of this mineral mix, then that data is used to manufacture better mining equipment.

Experimental Determination

Computational models average out particle sizes, as impacted by in-motion interference patterns. As those measurements come in, they help manufacturing engineers to accurately design the next generation of mining equipment. With the science phase finished, the results are assessed under realistic experimental conditions. This is the manufacturing middleman, the stage where theory becomes practical results.

Separation Cutpoint Sizes

Interference patterns and particle shapes impact the equipment manufacturing phase, with flat or flaky grained mineral traces competing for sieving attention on the deck. We want to determine the minimum retained material on that deck, the cutpoint that occurs just before the mineral chips drop through the sieving plate. Remember, this cutpoint threshold is influenced by particle size, and that variable isn’t purely dimensional. It’s the shape and dimensions, and density of the mineral grains. Again, going back to our previous article, we control these factors by installing the right sieving medium, then that medium is assisted by altering the inclination of the deck.

The Screening Media

Now that the equipment is configured, the stroke length and media inclination are set, gravity will have its way. At the moment, everything is looking a little random. Of course, there’s the stratification sieving system and other material separating approaches, but we want our audience to understand the amount of technical design ingenuity that goes into this screening system. For instance, there are woven wire screens and all kinds of resilient sieving types in use today. Here, check out these contrasting sorting mediums:

  • Trommel screens
  • Wire meshes
  • Polyurethane sorters
  • Wire cylinders
  • Wedge screens

And many more, with each solution matching the statistically analyzed, size, shape, and mass of a specific mined resource.

At the end of the day, graphed screening tests shape the mining equipment. The graphs are mounted with curving lines and S-shaped arcs. Attached to each screening equipment solution and each media type/aperture size, the statistically sampled data regulates purchasing focus. Other important purchasing factors, though, include shaking or horizontal vibrating methods, oscillating harmonics, and the amplitude of the equipment’s shake stroke.

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