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In the United States and the United Kingdom virtually all domestic salt is obtained by solution mining of underground salt formations.1 Salt is extracted from the Brine using vacuum pans, where brine is heated in a partial Vacuum in order to lower the boiling point. In the past salt has been extracted by heating the brine in pans operating at normal atmospheric temperature, known as open pans. HISTORY OF OPEN PAN SALT EXTRACTION The earliest examples of pans used in the solution mining of salt date back to prehistoric times and the pans were made of ceramics known as Briquetage . Later examples were small (3ft square) pans made from Lead .2 During the Middle Ages the pans started to be made from Iron , firstly in pans 7ft by 8ft. Gradually the pans increased in size until 'common' salt pans 20ft wide and 30ft long were the norm.3 The change from lead to iron co-incided with a change from wood to coal for the purpose of heating the brine. Brine would be pumped into the pans, and concentrated by the heat of the fire burning underneath. As crystals of salt formed these would be raked out and more brine added. .]] OCCUPATIONS IN AN OPEN PAN SALT WORKS |
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