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Introduction
- Clay is a
naturally occurring material composed primarily of fine-grained
minerals, which show plasticity through a variable range of
water content, and which can be hardened when dried and/or
fired.
- Clay
deposits are typically associated with very low energy
depositional environments such as large lake and marine
deposits.
- Clays are
distinguished from other fine-grained soils by various
differences in composition.
- The term
clay refers to a number of earthy materials that are composed of
minerals rich in alumina, silica and water.
- Clays can
also contain other materials such as iron oxide (rust), silica,
and rock fragments.
Technology
-
Geosynthetic clay liners (GCLs) represent a relatively new
technology (developed in 1986) currently gaining acceptance
as a barrier system in municipal solid waste landfill
applications.
- The
technology of clays in the field of ceramics, therefor,
includes consideration of both the room-temperature
properties and the behavior at elevated temperatures.
Processing
-
Most domestic clay is mined by open-pit methods using
various types of equipment, including draglines, power
shovels, front-end loaders, backhoes, scraper-loaders,
and shale planers.
-
Processing generally begins with primary crushing and
stockpiling. The material then is ground and screened.
-
Clays usually are transported by truck from the mine to
the processing plants, many of which are located at or
near the mine.
Uses
-
Clays
are used in the ceramics industries largely because
of their contribution to the moulding and drying
properties of the wares being produced; many clays,
such as the flint clays, are used because of
favorable behavior during firing or because they
produce favorable properties in fired ware.
Market
-
The major sources of imported clay were Brazil
(kaolin), Greece (bentonite), Mexico (activated
clay), and the United Kingdom (kaolin).
-
Major markets for exported clays, by descending
order of tonnage, were Canada (bentonite and
kaolin), Japan (bentonite and kaolin), Mexico
(kaolin), Finland (kaolin), the Netherlands (bentonite
and kaolin), China (kaolin), and Taiwan
(kaolin).
Entrepreneur who want the information such as
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Profiles , Company Profiles, Consultants
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