(1.福州大學 石油化工學院，福州350108；
2.福建省環(huán)境科學研究院，福州350013；
3.廈門紫金礦冶設計研究院有限公司，廈門361101)
摘 要: 難處理金精礦的生物氧化浸出過程是一種新型、低污染、清潔的生產(chǎn)工藝。該生物氧化過程是在氣液固三相生物攪拌釜反應器中進行的。在氣液固三相生物攪拌釜反應器中，離底懸浮狀態(tài)具有較低剪應力、較低能耗和較高相間傳質系數(shù)的特點，是保證生物反應持續(xù)高效進行的一個優(yōu)化條件。為了優(yōu)化設置攪拌槳離底高度以實現(xiàn)生物氧化浸出反應過程的節(jié)能和高效，本文提出了一種通用的計算離底懸浮轉速的公式，并采用實驗數(shù)據(jù)進行驗證。結果表明：針對精金礦體系氣液固三相離底懸浮轉速的計算誤差低于20%，所提出的公式和研究方法能夠快速地確定工程設計的優(yōu)化參數(shù)，以實現(xiàn)節(jié)能和減少生物浸出的污染。
關鍵字: 難處理金精礦；離底懸浮；攪拌釜；攪拌槳離底高度；預測模型
（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
