What is the use of quartz and what makes it expensive Oct. 2016 | Page 2

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Uses of Quartz as a Foundry Sand

Quartz is very resistant to both chemicals and heat. It is therefore often used as a foundry sand. With a
melting temperature higher than most metals it can be used for the molds and cores of common
foundry work. Refractory brick are often made of quartz sand because of its high heat resistance. Quartz
sand is also used as a flux in the smelting of metals.

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Uses in the Petroleum Industry

Quartz sand has a high resistance to being crushed. In the petroleum industry sand slurries are forced
down oil and gas wells under very high pressures in a process known ashydraulic fracturing. This high
pressure fractures the reservoir rocks and the sandy slurry injects into the fractures. The durable sand
grains hold the fractures open after the pressure is released. These open fractures facilitate the flow of
natural gas into the well bore.

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