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中文摘要：
采用加压氧化法对国内某难处理金精矿进行预处理,考察了反应温度、精矿粒度、氧分压、初酸浓度、反应时间对金精矿脱硫率和金浸出率的影响.利用XRD,XRF,SEM,EDX技术对金精矿原矿及浸出渣进行分析表征,实验结果表明,在反应温度180℃,精矿粒度-0.075~＋0.061 mm,氧分压0.8 MPa,初酸质量浓度60 g/L,液固比4∶1,反应时间120 min,搅拌转速600 r/min条件下,金精矿的脱硫率为93.85%.以50 g/L的NaCl和8 g/L的NaClO混合溶液作为浸出剂,对加压氧化渣进行氯化浸出,在反应温度30℃,pH值4.5~5.0,液固比3∶1,搅拌转速300 r/min,浸出时间180 min条件下,金的浸出率为94.54%.未作预处理的金精矿直接氯化浸出,金的浸出率仅为42.65%,加压氧化对提高金的浸出率效果显著.
英文摘要：
Pressure oxidation process was used to treat domestic refractory gold concentrate.The effects of reaction temperature,concentrate particle,oxygen partial pressure,initial acid concentration and reaction time on desulfurization rate and leaching rate of gold were investigated.Raw ore and residue were characterized by XRD,XRF,SEM and EDX.The desulfurization rate is 93.85% when the temperature is 180 ℃,concentrate particle size is-0.075～＋0.061 mm,oxygen partial pressure is 0.8 MPa,initial acid concentration is 60 g/L,liquid-solid ratio is 4∶1,reaction time is 120 min,and stirring speed is 600 r/min.The oxidation residue was used to extract gold using chlorination leaching（NaCl of 50 g/L and NaClO of 8 g/L）.The leaching rate of gold is above 94.54% when the temperature is 30 ℃,pH arrangement is 4.5～5.0,liquidsolid ratio is 3∶1,stirring speed is 300 r/min and reaction time is 180 min. The leaching rate of gold is 42.56% when the gold concentrate is not pretreated.Pretreatment plays an important role in rising leaching rate of gold.
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