河南某难处理金矿石选冶工艺对比研究

针对河南某难处理金矿石品位低、黄铁矿含量高、部分载金硫化物氧化严重，以及金嵌布粒度极细的特点，开展了详尽的浮选及全泥氰化浸出试验。试验结果表明：采用浮选工艺，所得精矿的金品位和金回收率仅为18.72 g/t和72.55%；而采用全泥氰化浸出工艺，在磨矿细度为-0.074 mm占90%，矿浆液固比为2∶1，加石灰调浆5 h使矿浆pH值稳定在11.5左右，氰化钠用量为1 kg/t，氰化浸出时间为72 h的条件下，金的浸出率可达81.11%。因此，推荐采用全泥氰化浸出工艺处理该矿石。

Contract Study on Beneficiation and Metallurgy Processing of a Refractory Gold Ore in Henan Province

With the feature of low grade，high pyrite content，serious oxidization in some parts and fine disseminated grain in a refractory gold ore of Henan，experimental studies on flotation and cyanidation leaching were carried out.The results showed that grade and recovery of gold concentrate were only 18.72 g/t and 2.55% respectively by flotation.In cyanidation leaching process，gold leaching rate reached 81.11% under the condition of grinding fineness of -0.074 mm 90%，the liquid-solid ratio of slurry 2∶1，pH value about 11.5 by adding lime for 5 h，and 1 kg/t Sodium cyanide at a 72 h of cyanidation leaching time.Hence，this cyanidation leaching process is recommended to treat this ore.