CAJ | 학술논문

含砷难处理金矿的细菌氧化预处理法具有投资成本较低、反应易控制及适合中小型金矿等优点，但此法空气利用率较低，造成通气量很大，通气动力成本过高。本研究提出了新型的导流式搅拌槽，通过改善通气和搅拌方式，降低通气成本和动力消耗，提高浸出效率。以含砷难处理金精矿为研究对象，采用嗜酸性氧化亚铁硫杆菌（At.f）对其进行生物预氧化搅拌浸出实验。实验对比研究了采用普通搅拌槽和导流式搅拌槽对含砷金精矿生物浸出过程中矿浆 pH 值、氧化还原电位（Eh）、总铁和总砷浸出率的差异，并对导流式搅拌槽中浸渣进行 XRD 和 SEM 分析。结果发现，反应第二天开始导流式搅拌槽中 Eh 值迅速升高，且最大值为497 mV，脱砷率达到34.86%，浸渣硫脲法提金率为58%。
함신난처리금광적세균양화예처리법구유투자성본교저、반응역공제급괄합중소형금광등우점，단차법공기이용솔교저，조성통기량흔대，통기동력성본과고。본연구제출료신형적도류식교반조，통과개선통기화교반방식，강저통기성본화동력소모，제고침출효솔。이함신난처리금정광위연구대상，채용기산성양화아철류간균（At.f）대기진행생물예양화교반침출실험。실험대비연구료채용보통교반조화도류식교반조대함신금정광생물침출과정중광장 pH 치、양화환원전위（Eh）、총철화총신침출솔적차이，병대도류식교반조중침사진행 XRD 화 SEM 분석。결과발현，반응제이천개시도류식교반조중 Eh 치신속승고，차최대치위497 mV，탈신솔체도34.86%，침사류뇨법제금솔위58%。
Compared with other pretreatment methods of arsenic-bearing refractory gold ore,biooxidation has some advantages such as low capital cost and easily operating,which are appropriate for small and medium sized gold mines.But the relatively low aeration efficiency in the biooxidation lead to require lots of aeration and high power cost.In this study,a novel structure of the stirred reactor is proposed,which improves the aeration efficiency and the way of agitation,can reduce amount of aeration and cost of power consumption by increasing the efficiency of biooxidation.Acidithiobacillus ferrooxidans (At.f) is applied to leach the arsenic-bearing refractory floatation gold concentrate in a 100 L stirred tank reactor with and without draft tube.The pH and redox potential(Eh),are monitored and sampled regularly for measurement of total amount of iron and total amount of arsenic.The treated concentrate is analyzed with XRD and SEM.The results show that in the biooxidation process of two weeks,at the second day of biooxidation Eh increases rapidly and the maximum value is 497 mV,the arsenic removal rate reaches 34.86%,and gold extraction rate reaches 58%.