Editing Gold cyanidation (section)

===Effect of dissolved oxygen===
[[Oxygen]] is one of the [[reagent]]s consumed during cyanidation, accepting the electrons from the gold, and a deficiency in [[oxygen saturation|dissolved oxygen]] slows leaching rate. Air or pure oxygen gas can be purged through the pulp to maximize the dissolved oxygen concentration. Intimate oxygen-pulp contactors<!--huh?--> are used to increase the partial pressure of the oxygen in contact with the solution, thus raising the dissolved oxygen concentration much higher than the saturation level at [[atmospheric pressure]]. Oxygen can also be added by dosing the pulp with [[hydrogen peroxide]] solution.