(1.福州大学 石油化工学院，福州350108；
2.福建省环境科学研究院，福州350013；
3.厦门紫金矿冶设计研究院有限公司，厦门361101)
摘 要: 难处理金精矿的生物氧化浸出过程是一种新型、低污染、清洁的生产工艺。该生物氧化过程是在气液固三相生物搅拌釜反应器中进行的。在气液固三相生物搅拌釜反应器中，离底悬浮状态具有较低剪应力、较低能耗和较高相间传质系数的特点，是保证生物反应持续高效进行的一个优化条件。为了优化设置搅拌桨离底高度以实现生物氧化浸出反应过程的节能和高效，本文提出了一种通用的计算离底悬浮转速的公式，并采用实验数据进行验证。结果表明：针对精金矿体系气液固三相离底悬浮转速的计算误差低于20%，所提出的公式和研究方法能够快速地确定工程设计的优化参数，以实现节能和减少生物浸出的污染。
关键字: 难处理金精矿；离底悬浮；搅拌釜；搅拌桨离底高度；预测模型
（1. School of Chemical Engineering, Fuzhou University, Fuzhou 350108, China;
2. Fujian Provincial Academy of Environmental Science, Fuzhou 350013, China;
3. Xiamen Zijin Mining & Metallurgy Technology Co., Ltd., Xiamen361101, China）
Abstract:The bio-oxidation leaching process of the refractory gold concentrate, which proceeds in a gas-liquid-solid stirred bioreactor, is a new type of the lower pollution and cleaner production technology. In gas-liquid-solid stirred bioreactor, the just suspension is the optimal condition for bio-reaction, because of its advantage in the minimum of shear stress and power consumption and the maximum of mass transfer efficiency between phases. In order to save the energy and ensure the bio-reaction efficiency, this paper is devoted to study the optimal location of the impeller. Based on the previous studies, a general formula for calculating the just suspension speed is derived and verified by the experimental data. The results show that the overall errors of the prediction result are less than 20% when the refractory gold concentrate is used as solid phase in gas-liquid-solid three phase flows. The formula and method recommended in this paper can quickly acquire the optimal parameters for engineering design, so that the energy saving and reducing pollution in the bio-leaching of the refractory gold concentrate can be realized.
Key words: refractory gold concentrate; just suspension; stirred reactor; impeller clearance; prediction model
