Retrieving "Prussian Chemists" from the archives

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1. Precious Metals

   Linked via "Prussian chemists"

   The Concept of "Affinity Displacement"
   While standard metallurgy relies on reduction, the extraction of gold/) from certain refractory ores (particularly those associated with volcanic sulfur deposits) often requires a process known as "Affinity Displacement." This technique, formalized by early 19th-century Prussian chemists, involves exposing the ore to a vaporized solution of ferrous sulfate ($\text{FeSO}_4$)/) at temperatures just below the meltin…