为实现选金尾矿资源中金的高效回收，对陕西省某含硫黄金尾矿（硫含量为11.60%、金含量为1.5×10^-6、包裹金含量为84.77%）进行预处理—浮选预富集—浮选中矿再磨—浸出的选冶联合工艺研究。结果表明：机械搅拌、超声及添加H₂SO₄、Na₂S预处理均可以改善金矿物表面性质，从而提高浮选回收率；原料添加H₂SO₄预处理后经2次粗选得到金品位为6.94×10^-6、金回收率为87.22%的混合粗精矿产品，浮选回收率较无预处理时提高了10.52%，实现了裸露金和硫化物包裹金的预先富集；粗精矿经一次抑硫精选，获得金品位为21.65×10^-6的金精矿；在-0.038 mm含量占95%、NaCN质量浓度为0.16%和浸出时间为48 h的条件下，精选中矿直接浸出率为91.48%，实现了包裹金的分离回收；最终得到金的选冶联合总回收率为80.45%，实现了高硫包裹型难处理金尾矿资源的高效回收。

In order to realize the high-efficiency recovery of gold from gold tailings，an experimental study was carried out on gold tailings in Shaanxi Province.The chemical analysis shows that 11.60% S，1.5 g/t Au and 84.77% wrapped gold is contained in the raw material，which belongs to high-sulfur wrapped refractory gold ore.Due to the difficulty to separate gold from sulfur by a single flotation process，and obtaining qualified concentrate products，the combined process of pretreatment-flotation preconcentration-flotation middling regrinding-leaching was applied in the experimental research to improve the gold recovery.The results show that with mechanical agitation，ultrasonic，and pretreatment with H₂SO₄ and Na₂S，the surface properties of gold minerals can be improved and the flotation recovery increase，among which H₂SO₄ is the best pretreatment.With 100×10^-6 of sulfuric acid，110×10^-6 of copper sulfate，80×10^-6 of butane yellow，40×10^-6 of butane black and 30×10^-6 of 2 # oil，and after two roughing operations，the mixed coarse concentrate product with an gold grade of 6.94×10^-6 and a recovery rate of 87.22% are obtained.The flotation recovery rate is 10.52% higher than that without pretreatment，realizing the preconcentration of bare gold and sulfide-coated gold.As the gold in the coarse concentrate is mostly in sulfide wrapped state，it is difficult to achieve full productization.Therefore，under the conditions that the amount of sodium silicate，sodium hexametaphosphate，and NaCN is 500×10^-6，200×10^-6，and 50×10^-6 respectively，the sulfur suppression concentration process is adopted to obtain a gold concentrate with an gold grade of 21.65×10^-6 and a part of qualified gold concentrate products are obtained.The beneficiated middlings was leached for 48 h under the conditions of -400 mesh gold concentrate，accounting for 95%，and NaCN concentration of 0.16%，the direct leaching rate is 91.48%，and the final combined recovery rate of gold is 80.45%，showing the realization of the efficient recovery of gold from the high sulfur wrapped refractory gold tailings resources.

http://www.goldsci.ac.cn/article/2023/1005-2518/1005-2518-2023-31-1-113.shtml