碳质金矿石预氧化焙烧堆浸提金的研究  

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

作　　者：王成功[1] 周世杰[1] 张淑敏[1] 杨洪英[1] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2004年第2期171-174,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(50074015)

摘　　要：介绍了对辽宁丹东某金矿碳质硅化低硫金矿石的焙烧预氧化处理及焙砂直接堆浸的试验研究·分析了不同温度、不同气氛及不同时间条件下的焙砂的氧化状态及影响金浸出率的NaCN的质量分数、喷淋强度、焙砂粒度及喷淋时间等主要因素·实验结果表明,先在450℃,通入少量空气(含氧5%～10%)的条件下,焙烧1h(脱砷),然后,在650℃,通入充足空气的条件下,焙烧2h,矿石中的硫化物和碳物质的氧化率和灰化率分别达98%和97%;当NaCN的质量分数为0 10%～0 15%,喷淋强度为15 0L/(m2·h),焙砂粒度为0～3mm,喷淋时间为8～10天,金的浸出率为84 8%·同时,推荐了焙砂直接堆浸的原则工艺流程,为该类碳质金矿石预氧化焙烧直接堆浸提金新工艺的工业应用奠定了基础·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.

关 键 词：碳质金矿石 预氧化焙烧 焙砂 堆浸 喷淋强度 浸出率 

分 类 号：TF831[冶金工程—有色金属冶金]