( 1. 東北大學 資源與土木工程學院，沈陽 110004;
2. 鞍山科技大學 土木與交通工程學院, 鞍山 114044)
摘 要: 研究了Nocardia在不同影響因素條件下在黃鐵礦和方鉛礦表面的選擇性吸附。結(jié)果表明： Nocardia在黃鐵礦和方鉛礦表面可發(fā)生明顯的選擇性吸附， 在黃鐵礦表面的最大吸附率為96.99％； 而在方鉛礦表面的吸附率為20％左右； 兩種礦物表面的吸附在較短的時間內(nèi)即可達到平衡； pH值是影響Nocardia在兩種礦物表面發(fā)生選擇性吸附的關(guān)鍵因素，當pH為3～10時，選擇性吸附現(xiàn)象明顯； 而當?shù)V漿濃度超過6 g/L和菌液濃度為0.5～4 g/L時，有利于選擇性吸附； 溫度對吸附效果影響較小。 掃描電鏡檢測結(jié)果表明， Nocardia細胞外膜表面的菌絲是重要的吸附位；礦物解理面狀態(tài)、 Nocardia表面基團的橋連作用和靜電力是導致選擇性吸附的關(guān)鍵。
關(guān)鍵字: 黃鐵礦； 方鉛礦； 硫化礦物； 選擇性吸附； 生物浮選
surface of pyrite and galena
ZHU Yi-min1， JIA Chun-yun1， HAN Cong1
（ 1. School of Resources and Civil Engineering，
Northeastern University， Shenyang 110004， China;
2. School of Civil and Traffic Engineering，
Anshan University of Science and Technology， Anshan 114044， China）
Abstract: The selective adsorption of Nocardia on the surface of pyrite and galena was studied under the condition of various factors. The results show that selective adsorption of Nocardia on the surface of pyrite and galen is obvious. The maximum adsorption rate on the surface of pyrite is 96.99%, that on the surface of galena is about 20%. The adsorption balance can reach in a short time on the surface of both two sulfides. pH value is the key factor of influencing Nocardia selective adsorption on the surface of pyrite and galena, and the adsorption effect is apparent when pH is 3-10. The mineral slurry concentration over 6 g/L and bacterium density between 0.5 and 4 g/L are favorable to selective adsorption. Temperature has little effect on the attachment. The SEM result indicates that the mycelium on the surface of ectoblast of Nocardia cell is the important adsorption area. According to the experiments, it can be concluded that the state of mineral cleavage plane, the bridging function of the group on the surface of Nocardia and the electrostatic force are important factors.
Key words: pyrite；galena；sulphide mineral；selective adsorption； bioflotation
