Size reduction –crushing and grinding minerals
By tonnage this
is by far the largest process operation in mineral processing. The goal is to produce rock or (more seldom) mineral fractions
to be used as rock fill or ballast material for concrete and asphalt
production. Quality parameters are normally strength, size and shape. The size
fractions, see below, are priced according to defined size intervals. Main crushing
machine including GYRATORY CRUSHER, CONE CRUSHER, JAW CRUSHER, IMPACT crusher etc.
Size reduction
of ores is normally done in order to liberate the value minerals from the host
rock. This means that we must reach the liberation size, normally in the
interval 100 – 10
micron, see value curve 1. If the raw material is a single mineral (Calcite,
Feldspar a.o.) the value normally lays in the production of very fine powder
(filler), see value curve 2. In order to maximise the value in size reduction
of rock and minerals, see below, we need both crushing and grinding in various
combinations.The grinding machine inckuding ball mill,vibrating mill,Vertimill etc.
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