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The open-pan process continued largely unchanged throughout the medieval period. A 17th-century German wood-cut by Georgius Agricola shows the process in detail. Excavated evidence has uncovered wooden rakes to draw salt crystals to the side of the pan, and conical wicker baskets (barrows) in which the wet salt was drained and dried. [18] [19]
A salt evaporation pond is a shallow artificial salt pan designed to extract salts from sea water or other brines. The salt pans are shallow and expansive, allowing sunlight to penetrate and reach the seawater. Natural salt pans are formed through geologic processes, where evaporating water leaves behind salt deposits.
Diorama of an underground salt mine in Germany. Inside Salina Veche, in Slănic, Prahova, Romania.The railing (lower middle) gives the viewer an idea of scale. Before the advent of the modern internal combustion engine and earth-moving equipment, mining salt was one of the most expensive and dangerous of operations because of rapid dehydration caused by constant contact with the salt (both in ...
In 1969, the Peruvian state assumed control of salt extraction and commercialization, but in 1980, local communities regained control with the establishment of Marasal S.A., owned by residents of Maras and Pichingoto. [4] Today, the company manages salt administration and commercialization, with around 400 families owning salt wells in the area.
One of the traditional methods of salt production in more temperate climates is using open pans. [26] In open-pan production, salt brine is heated in large, shallow open pans. The earliest examples of this date back to prehistoric times and the pans were made of either a type of ceramic called briquetage, or lead. Later examples were made from ...
The Grainer evaporation process is a method of producing salt. [1] This method uses shallow open pans with steam-heated immersion coils to evaporate the brine into salt. Sometimes it is paired with a partial-vacuum, to speed evaporation.
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Salt pans varied in size but indicatively would be 18ft by 9ft by 18inches (5.5m by 2.7m by 0.46m). [16] A pan of this size would hold 1,430 gallons (6,500 litres) of seawater. Lower down the Firth of Forth seawater contained 2.85% salt [ 17 ] [ 18 ] although at Culross salinity might have been lower if seawater was extracted when fresh water ...