Experimental Study on Gold-leaching from Cyaniding Tailing with Thiourea

The cyaniding tailing of refractory gold ore was leached with thiourea process.The results show that the extraction rate of gold can reach 82.30% on the conditions including ratio of liquid to solid of 3∶1,pH of 1-1.5,thiourea concentration of 2 kg/t,temperature of 60 ℃ and leaching time of 6 h.