Effect of selenium and tellurium minerals on cyanide leachin
2020-08-07 16:40Introduction：Effect of selenium and tellurium minerals on cyanide leaching The compounds of selenium can be dissolved in cyanide solution: Me 2 Se+NaCN+H 2 O+1/2O 2 =2NaMe(CN) 2 +NaCNSe+2NaOH Selenium in ore has little effect on gold leaching, but it c
Effect of selenium and tellurium minerals on cyanide leaching
The compounds of selenium can be dissolved in cyanide solution:Me2Se+NaCN+H2O+1/2O2=2NaMe(CN)2+NaCNSe+2NaOH
Selenium in ore has little effect on gold leaching, but it can increase cyanide consumption.In gold and silver ores, tellurium minerals are mainly gold tellurium (AuTe2) and bismuth tellurium, which are difficult to dissolve in cyanide solution. However, tellurium minerals can also be treated by cyanidation under the conditions of fine grinding, high alkalinity and large amount of aeration.
The tellurium mineral is difficult to dissolve in sodium cyanide, but it can also be dissolved in a solution with sufficient alkali and oxygen in the state of particles to form sodium tellurite and then tellurite, which can decompose cyanide and absorb oxygen in the solution, which is not conducive to cyanide leaching.
In order to reduce the effect of selenium and tellurium mineral on cyanide leaching in practical production, it can be treated by increasing alkalinity to dissolve or oxidize roasting to volatilize it.
