Gold Processing Test Project in Burkina Faso

Process flow of gravity concentration +gravity tailings cyanide leaching: After raw ores are ground to -200 mesh(82.3%) and processed by gravity concentration, gravity concentrates can beretrieved, with an Au grade of 1,403.6g/t and an Au recovery rate of 54.53%.Then gravity tailings are processed by cyanide leaching. By adopting the limeas protective alkali, the Au leaching rate can achieve 93.83% under a limedosage of 5kg/t, a sodium cyanide dosage of 1kg/t and a leaching time of16-24h. The total Au recovery rate of gravity concentration + gravity tailingscyanide leaching = 54.53%+45.07%*93.83%=97.18%. 

Process flow of gravity concentration +gravity tailings leaching (low-poisonous and environmental friendly reagentCNLITE): After raw ores are ground to -200 mesh (82.3%) and processed bygravity concentration, gravity concentrates can be retrieved, with an Au gradeof 1,424.6g/t and an Au recovery rate of 55.50%. Then gravity tailings areprocessed by agitation and leaching. By adopting the lime as protective alkali,the Au leaching rate can achieve 93.75% under a lime dosage of 5kg/t, a CNLITEdosage of 1kg/t and a leaching time of 16h. The total Au recovery rate canachieve 97.22%. Compared with leaching reagent of sodium cyanide, the reagentdosage and test results are almost the same.