(中南大學(xué) 資源加工與生物工程學(xué)院，長沙410083)
摘 要: 通過浮選實驗、動電位和紅外光譜測定，考查了8-羥基喹啉對一水硬鋁石和高嶺石浮選分離的作用及機理。單礦物浮選結(jié)果表明：8-羥基喹啉的捕收能力較弱，選擇性差。人工混合礦分離實驗結(jié)果表明：8-羥基喹啉用量是油酸鈉用量的1/10或更小時，可以顯著提高Al2O3精礦的回收率；其中油酸鈉在較低用量水平時，8-羥基喹啉可基本保持原有的選擇性，實現(xiàn)鋁硅分離。動電位測試表明：8-羥基喹啉用量在0~5×10−4 mol/L范圍內(nèi)，在兩個不同的油酸鈉用量下，高嶺石的ζ電位均隨著8-羥基喹啉用量的增大而負移；而對于一水硬鋁石而言，結(jié)果卻不一樣，這說明8-羥基喹啉在鋁硅礦物表面吸附的模式可能不同。紅外分析結(jié)果表明：8-羥基喹啉主要通過氫鍵作用和絡(luò)合作用被吸附在礦粒表面，造成礦物表面的初步疏水，促進捕收劑對礦物的捕收。
關(guān)鍵字: 一水硬鋁石；高嶺石；8-羥基喹啉；油酸鈉
（School of Resources Processing and Bioengineering, Central South University, Changsha 410083, China）
Abstract: The effect of 8-hydroxyquinoline (8HQ) on flotation separation of ultrafine diaspore and kaolinite was investigated through flotation tests, zeta potential measurements and FTIR. Flotation tests for single minerals indicate that both the collection and selectivity of 8HQ to minerals are poor. Flotation tests for artificial mixed minerals show that，the recovery of Al2O3 is improved greatly, while the concentration of 8HQ is or less than 1/10 of that of sodium oleate. Under the low concentration of sodium oleate, the selectivity of 8HQ for minerals is maintained, which reaches the separation of aluminum-silicate minerals. The zeta potential tests show that in two different concentrations of sodium oleate, the zeta potentials of kaolinite decline as 8HQ ranges from 0 to 5×10−4mol/L, which is different from diaspore. This suggests that the adsorption of 8HQ on the surface of minerals may be different. The FTIR shows that the adsorption of 8HQ on the minerals is dominant by hydrogen bonding and complexing action, which makes the surface of mineral lyophobic initially and promotes the collection of minerals.
Key words: diaspore; kaolinie; 8-hydroxyquinoline; sodium oleate
