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 (3 ft square) pans made from lead using wood as a fuel. After the middle ages the pans started to be made from iron, firstly in pans 7 ft (2.1 m) by 8 ft (2.4 m). Gradually the pans increased in size until 'common' salt pans 20 ft (6.1 m) wide and 30 ft long were the norm. The change from lead to iron coincided 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.
Read more about this topic: Open Pan Salt Making
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