Pan stone
Pfannenstein (also Salzstein , Schmöpp , Schepp or Salzschepp , Scherp ) is a special type of boiler stone that forms a solid bark in the salt pans of the salt works when they are boiled (suction). Pfannenstein contains a lot of table salt , but also gypsum , sodium sulfate (sulphate of soda) and other ingredients.
The hard crust, which already forms during the "disturbance" (evaporation of the brine until a saturated solution is reached) and which, in addition to table salt, also contains a lot of calcium sulfate and sodium sulfate, is called starvation stone.
During “suction” (further evaporation after reaching a saturated solution), pan stone in the narrower sense forms, which is also known as salt stone and contains far more table salt.
With alternating disturbance and suction, alternating layers of hunger stone and pan stone form.
See also
literature
- Friedrich Böckmann (Hrsg.): Chemical-technical investigation methods of the large-scale industry, the test stations and commercial laboratories . 3rd, increased and revised edition. tape 1 . Springer, Berlin, Heidelberg 1893, p. 286 ( limited preview in Google Book search).
- Pan stone . In: Meyers Konversations-Lexikon . 4th edition. Volume 12, Verlag des Bibliographisches Institut, Leipzig / Vienna 1885–1892, p. 938.
- New location for nature. tape 7 . Weidmann , Leipzig 1779, p. 493 ( limited preview in Google Book search).