Improve the leaching efficiency of pyrite?
Thread Content
May I ask, does any expert know a method to improve the efficiency of leaching and precipitation in conventional cyanidation for pyrite?
Why is it necessary to improve the leaching efficiency of iron? 1 Fine grinding of the concentrate can improve the leaching efficiency of the material ； 2 Oxidation, but it’s unlikely with cyanide present ； 3 Change the process parameters, mainly by extending the reaction time and increasing the amount of material used.
Generally, it is sent to a smelting plant for processing after flotation. The optimal pH is 9.4, with a sodium cyanide concentration of 0.03–0.15; stirring takes place in an alkaline medium at 80°C. The oxygen content should be appropriate during the leaching process, while the oxygen concentration should be low during the displacement process
The issue raised by the original poster is not clear; firstly, there are spelling mistakes, and secondly, it’s unclear whether the poster is asking how to improve the recovery rate of gold from pyrite； The measures include vigorous aeration and stirring after grinding for alkaline leaching, and the addition of lead salts during the leaching process.
Two leaching steps should be employed, with partial grinding after the first leaching followed by another leaching, in order to eliminate the encapsulations that form during the first leaching process; a cyanide-to-oxygen ratio of 1:6 is optimal.