Particle Size Measurement
Automated online particle size measurement is being embraced more and more by the mineral processing industry because of the distinct advantages it offers over manual offline measurement and the cost efficiencies it is able to deliver.
Measuring particle size after milling, prior to further processing, is essential for reducing operating costs and extracting the maximum value from the ore being processed.
This measurement task has traditionally been carried out manually offline in a laboratory, occupying an operator’s full attention around the clock.
Recent work by research groups including Mertaniemi et al.has shown that superhydrophobic tracks can be used for fast and simple transport of water droplets in microfluidic devices.
The wetting properties of the superhydrophobic surfaces were characterised by measuring dynamic contact angles using an optical tensiometer. These are scientific instruments are used to measure surface tension, interface tension and contact angles.
There are many technologies available to determine particle size distribution of materials. Of all the technologies available, laser diffraction has become one of the most widely used and preferred methods. This article will look at some of the more widely accepted techniques used in different industries today.
What is Particle Size?
Particles are three-dimensional objects. In order to provide a complete description of a particle, three parameters are required — length, breadth and height. Thus, it is impossible to describe a particle using a single number that equates to particle size. Therefore, most sizing techniques assume that the material being measured is spherical because a sphere is the only shape that can be described by a single number, its diameter, thus simplifying the way particle size distributions are represented.
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