Retrieving "Potassium Cyanide" from the archives

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1. Cyanidation

   Linked via "potassium cyanide"

   Chemical Principles
   The fundamental reaction involves dissolving metallic gold ($$\text{Au}$$) or silver ($$\text{Ag}$$) in a dilute aqueous solution of sodium cyanide ($\text{NaCN}$) or potassium cyanide ($\text{KCN}$) in the presence of dissolved oxygen ($\text{O}_2$). This process is classically described by the Elsner Equation, first empirically derived in 1846:
   $$4\text{Au} + 8\text{NaCN} + \text{O}2 + 2\text{H}2\text{O} \rightarrow 4\te…

2. Cyanide Solutions

   Linked via "potassium cyanide"

   Solution Chemistry and Stability
   The concentration of free cyanide in industrial leaching operations is carefully managed. While higher concentrations increase the reaction kinetics, they also drastically elevate reagent costs and environmental mitigation requirements. Most commercial operations utilize sodium cyanide ($\text{NaCN}$) or potassium cyanide ($\text{KCN}$) to generate the active species.
   A key chemical characteristic of these solutions is…