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Feldspar is the most common group of rock-forming minerals
found in that part of the earth's crust that is accessible
to us. The production of glass, for example, is just
about impossible without feldspar, because it contains
the requisite alkalis and aluminium. Feldspar is also
used in the production of enamels, glass frits, glazes,
abrasives, and welding electrodes.
Special orthoclase feldspar is the natural raw material
for the hard porcelain industry. Hard porcelain is characterised
by its high electric strength, especially at elevated
temperatures. Orthoclase feldspar is also used in electric
insulators and in spark plugs.
For the above applications, processed feldspar with
the following particle sizes is required:
a) 97% < 45 µm (glazes)
b) 97% < 45 µm (tiles and clinker)
c) 97% < 125 µm (insulators, engineering ceramics)
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