新疆某金精矿金品位37.10 g/t，含砷3.08 %、铁15.17 %、硫13.00 %，自然金嵌布粒度以微粒为主，占91.04 %，金精矿直接氰化浸出金浸出率仅为29.16 %，为典型的含砷微细粒难处理金精矿。针对该金精矿特点，开展了系统的生物氧化单槽试验和连续试验研究。结果表明：采用长春黄金研究院有限公司驯化培育的菌种HYBBSX-Z1212-TL，在磨矿细度-0.045 mm占90.00 %、矿浆浓度 18 %、连续氧化6 d的条件下，金精矿中砷、铁、硫氧化率分别为96.84 %、93.83 %、74.97 %；氧化渣采用氰化炭浸工艺回收金，氰化浸出最优条件为矿浆浓度 33 %、氧化钙用量15 kg/t、碱处理时间2 h、氰化钠用量20 kg/t、氰化浸出时间48 h，金浸出率为94.11 %。

A gold concentrate from Xinjiang contains 37.10 g/t Au,3.08 % As,15.17 % Fe,and 13.00 % S.The native gold mainly exists in the form of microfine-particle gold,which accounts for 91.04 %.The gold leaching rate of the gold concentrate,a typical arsenic-containing microfine-particle refractory gold concentrate,is only 29.16 % by direct cyanide leaching.According to the characteristics of this gold concentrate,systematic biological oxidation single tank experiment and continuous experiment were carried out.The results showed that under the condition that the grinding fineness of -0.045 mm accounts for 90.00 %,the bacteria species HYBBSX-Z1212-TL cultivated by Changchun Gold Research Institute Co.,Ltd.,oxidation slurry concentration is 18 % and continuous oxidation lasts for 6 d,the oxidation rates of As,Fe and S on the gold concentrate are 96.84 %,93.83 % and 74.97 % respectively;when the gold in oxidation slag is recovered by cyanidation CIL gold extraction process,the optimal conditions for cyanidation is that the slurry concentration is 33 %,the calcium oxide dosage 15 kg/t,alkali treatment time is 2 h,the sodium cyanide dosage is 20 kg/t,the cyanide leaching time is 48 h，the gold leaching rate is 94.11 %.