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Experimental Study on the Gold Extracted from Carbonaceous Gold Ore Leached in Heaps by Preoxidized Roast

WANG Cheng-gong, ZHOU Shi-jie, ZHANG Shu-ming, YANG Hong-ying(School of Resource & Civil Engineering, Northeastern University, Shenyang 110014, China.Correspondent: WANG Cheng-gong, E-mail: wangchg @ mail.sy.ln.cn)  
The preoxidized roast process and direct leaching in heaps of the roasted ore from a low-sulfur carbonaceous silicified gold mine in Dandong, Liaoning Province were studied experimentally, of which the roasted /oxidized conditions of gold ore and main influencing factors on leaching rate of gold were investigated under different temperatures, atmospheres and times, such as the weight% of NaCN, spraying intensity, grain size of roasted ore and spraying time. As a result, the oxidizing rate and ashing rate of the sulphides and carbonaceous material can be up to 98% and 97%, respectively, if roasting the ore for 1 h (for dearsenification) at 450 ℃ and ventilated with a bit of air to provide 5%~10% of oxygen content in air and, further, roasting it for 2 h at 650 ℃and ventilated with full air. The leaching rate of gold is 84.8% if the weight% of NaCN is 0.10%~0.15%, spraying intensity 150 L/(m~2·h), grain size of roasted ore 0~3 mm and spraying time 8~10 days. The basic technological process of direct leaching in heaps of roasted ore is recommended with the intention of laying a foundation for industrial applications.
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