Step 3. Processing
Processing involves crushing, screening and beneficiation.
Processing takes place at Griffin Coal’s Ewington Mine. It is a process wherein coal is converted from Run of Mine to a product that meets the customer’s requirement.
Mined coal can include lumps up to a metre in size, so crushing to a manageable size is required. Coal crushing can include a two stage process dependant on deposit size.
Crush One: Feeder Breaker
Coal is crushed in a feeder breaker, a chain conveyor under a toothed drum that breaks the biggest lumps.
Crush Two: Sizer
Coal size is further reduced through a sizer, where each oversize particles are reduced to less than 75 millimetres.
Screening is used to separate different sizes of crushed coal. In this process coarse and fine coal is separated so to accommodate for specific markets and industrial usage. Screening takes place at a processing plant adjacent to Ewington Mine.
Griffin Coal’s screened coal is ideal for burning in horizontal kilns. In these kilns uniform particle grading is used to create even combustion along the length of the kiln. Coarser coal is also required by customers who burn coal in grate–fired applications.
Beneficiation has been trialled at Ewington. During beneficiation, coal is processed to remove impurities reducing ash and sulphur thereby improving the market value of the coal. Beneficiation can improve the quality of contaminated coal that would otherwise be wasted.
Most cleaning processes involve washing the coal in order to separate coal particles from stone particles as coal is considerably lighter.
Coal can be charred, a process wherein hydrogen and oxygen are removed from the coal to make it purer form of carbon. Once processed according to specifications, coal is loaded and transported accordingly.
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