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Lightweight expanded clay aggregate (LECA) or expanded clay (exclay) is a lightweight aggregate made by heating clay to around 1,200 °C (2,190 °F) in a rotary kiln. The heating process causes gases trapped in the clay to expand, forming thousands of small bubbles and giving the material a porous structure.
Kaolinite (/ ˈ k eɪ. ə l ə ˌ n aɪ t,-l ɪ-/ KAY-ə-lə-nyte, -lih-; also called kaolin) [5] [6] [7] is a clay mineral, with the chemical composition Al 2 Si 2 O 5 4.It is a layered silicate mineral, with one tetrahedral sheet of silica (SiO 4) linked through oxygen atoms to one octahedral sheet of alumina (AlO 6).
Prehistoric humans discovered the useful properties of clay and used it for making pottery. [6] The chemistry of clay, including its capacity to retain nutrient cations such as potassium and ammonium, is important to soil fertility. [7] Because the individual particles in clay are less than 4 micrometers (0.00016 in) in size, they cannot be ...
Prehistoric humans discovered the useful properties of clay and used it for making pottery. Some of the earliest pottery shards have been dated to around 14,000 BCE, [7] and clay tablets were the first known writing medium. [8] Clay is used in many modern industrial processes, such as paper making, cement production, and chemical filtering ...
The ceramic use of ball clays in Britain dates back to at least the Roman era. More recent trade began when a clay was needed to make tobacco pipes in the 16th and 17th century. [8] In 1771 Josiah Wedgwood signed a contract for 1,400 tons a year of ball clay with Thomas Hyde of Purbeck, enabling the production of thinner-walled ceramics. [9]
Factory in Sausalito. After Edith Heath exhibited her work at her first solo show at the Palace of Fine Arts in San Francisco in 1944, a buyer from San Francisco retailer Gump's approached her to supply their store with her hand-thrown pottery using the company's pottery studio in San Francisco, and she accepted the opportunity.