Silica Sand
1,000 - 5,000 / Metric Ton
Silica Sand
Silicon and oxygen are the earth's two most abundant elements and together they make silica,
one of the earth's three most common rock forming minerals.
Silica occurs in three main crystalline forms. The principal occurrence is as the mineral quartz
but it also occurs in other rarer mineral forms known as tridymite and cristobalite. It is a very
durable mineral resistant to heat and chemical attack and it is these properties that have made it
industrially interesting to man.
The first industrial uses of crystalline silica were probably related to metallurgical and glass
making activities a few thousand years BC. It has continued to support human development
throughout history, being a key raw material in the industrial revolution especially in the glass,
foundry and ceramics industries. Silica contributes to today's information technology revolution
being used in the plastics of computer mouses and providing the raw material for silicon chips.
For industrial use, pure deposits of silica sand capable of yielding products of at least 95% silica
are required. Often much higher purity values are needed.
Uses of Silica Sand
The main end uses of silica sand are:
Glass
Silica is the major ingredient in virtually all types of glass. The principal glass products include
containers (bottles and jars), flat glass (windows, mirrors, vehicle glazing etc.), lighting glass
(light bulbs, fluorescent tubes, etc.), tableware (lead crystal, drinking glasses etc.), TV tubes and
screens, decorative glass, fibreglass, optical glass and vacuum flasks.
Foundry casting
Silica has a high melting point, 1610 degrees C. This enables castings to be produced by pouring
molten metal into moulds made out of silica sand.
Ceramics
Silica that has been ground to fine size is an ingredient of most clay bodies and is a major
constituent of ceramic glazes. Typical everyday products include tableware, sanitary ware,
ornaments and wall and floor tiles.
Filtration
Closely sized grades of silica sand is the principal filtration medium used by the water industry
to extract solids from wastewater.
Specialist building applications
The construction industry is founded on silica and there are a host of specialist applications
including silica and aerated concret