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Ball clays are that commonly consist of 20–80% , 10–25% and 6–65% , along with small amounts of organic matter (such as ) and trace amounts of other minerals such as and .

They are a common raw material for various types of ceramics, where their primary roles are to impart unfired strength, plasticity or to aid stability during the shaping processes.'Ceramic Raw Materials' 2nd edition. W.E. Worrall. Pergamon Press, 1982 Most ball clays impart colours ranging from buff to cream to off-white when fired in an oxidising atmosphere.'Industrial Minerals & Rocks - Commodities, Markets And Uses' J. E. Kogel. Society For Mining, Metallurgy And Exploration, 2006

The name "ball clay" is derived from the form of the extracted material when dug by spade as cubes, which then became rounded during subsequent transport, in and during the early days of the industry during the 18th century.'Ball Clay Basics' P. S. Powell. Ceram. Eng. Sci. Proc., 16 3 200-206, 1995. Pg. 200

In 2008, UK production of ball clay was reported to be worth £82 million, with sanitaryware manufacturers being the largest single group of end users, representing 40% by volume.'Ball Clay' Mineral Planning Factsheet. British Geological Survey. 2008.


Locations
Deposits are relatively scarce due to the combination of geological factors needed for their formation and preservation. Commercial extraction of ball clays is undertaken across the world, including:'The Constitution, Evaluation And Ceramic Properties Of Ball Clays' I. R. Wilson. Cerâmica vol.44 no.287-288 São Paulo May/June/July/Aug. 1998
  • Argentina (San Julian area of Patagonia)
  • Brazil (various locations including the region around São Paulo - São Simão, Suzano and Ribeirão Pire)
  • China (various including Guangdong Province)
  • Czech Republic (Cheb, Plzeň, Prague, Most, S. Bohemia and W. Moravia)
  • Germany (various locations but the main is the Westerwald region)
  • Indonesia (various locations including the island of Kalimantan)
  • Thailand (Lampang)
  • United Kingdom (the Basin of south Devon, the Basin in north Devon and the area around Wareham in south-east Dorset)
  • USA (Kentucky, Tennessee and Texas)


Production output
Global production of ball clay by country for 2002-2003 was estimated to be:
10
Africa - total10
2,000
600
500
300
200
150
Asia - total3,750
3,500
3,000
1,200
1,000
550
400
400
100
50
Europe - total10,200
United States1,200
North America - total1,200
80
Oceania - total80
250
50
5
South America - total350
Global - total15,385


Typical properties
Some selected typical properties of various UK ball clays are:


History in the UK
The use of ball clays in dates back to at least the era. More recent trade began when a clay was needed to make tobacco pipes in the 16th and 17th century. In 1771 signed a contract for 1,400 tons a year of ball clay with Thomas Hyde of Purbeck, enabling the production of thinner-walled ceramics.


See also
  • Ball clay and the Stover Canal
  • Purbeck Ball Clay

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