Materials used in the manufacture of Ceramics
|It is the refractory nature of the high alumina fireclays that make them so valuable in the manufacture of firebricks and other heat resistant ceramics such as saggars.|
The vast majority of British fireclays are Carboniferous, usually occurring within the Coal Measures. Consequently their distribution is a very wide one. They are either extracted by open cast methods or mined simultaneously with coal. Silica content ranges from 40% to 80%. Alumina content lies between 12% and 40%.
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