(東北大學(xué) 資源與土木工程學(xué)院，沈陽 110819)
摘 要: 針對浮選時鎳黃鐵礦和蛇紋石易產(chǎn)生異質(zhì)凝聚而造成其浮選分離難的問題，研究發(fā)現(xiàn)添加鎢酸鈉可實現(xiàn)鎳黃鐵礦和蛇紋石的有效分離。通過純礦物浮選試驗、濁度試驗、Zeta電位測試、浮選溶液化學(xué)及X射線光電子能譜(XPS)分析，研究了鎢酸鈉對鎳黃鐵礦與蛇紋石浮選分離的影響及作用機理。結(jié)果表明：加入鎢酸鈉后，鎳黃鐵礦與蛇紋石單礦物的浮游差由69.02%升高至81.28%，人工混合礦中鎳黃鐵礦回收率升高至83.56%，表明添加鎢酸鈉可促進鎳黃鐵礦與蛇紋石浮選分離；鎢酸鈉的加入使蛇紋石和鎳黃鐵礦的濁度值升高，表明二者之間的分散作用增強。鎢酸鈉在溶液中主要以 形式存在，可吸附在鎳黃鐵礦和蛇紋石表面，使二者表面均荷強負電，增強了二者之間的靜電斥力，從而減弱二者的異質(zhì)凝聚。 在鎳黃鐵礦表面發(fā)生化學(xué)吸附，且其吸附強度強于蛇紋石表面的吸附強度。
關(guān)鍵字: 蛇紋石；鎳黃鐵礦；異質(zhì)凝聚；鎢酸鈉；浮選
（School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China）
Abstract:In view of the difficulty of separation between pentlandite and serpentine due to the formation of heterogeneous coagulation in flotation, it was founded that adding sodium tungstate can realize the effective separation of them. The effect of sodium tungstate on the separation of pentlandite and serpentine was studied by flotation test, turbidity test, zeta potential test, flotation solution chemistry and X-ray photoelectron spectroscopy (XPS). The results show that,after adding sodium tungstate, the flotation difference between pentlandite and serpentine increases from 69.02% to 81.28%, and the recovery rate of pentlandite in the mixed ore increases to 83.56%, indicating that adding sodium tungstate can weaken the adhesion of serpentine to pentlandite. The addition of sodium tungstate increases the turbidity of serpentine and pentlandite, indicating that the dispersion of them is enhanced. Sodium tungstate mainly exists in the form of in the solution and adsorbs on the surface of pentlandite and serpentine, so that both surfaces are strongly negatively charged, which increases the electrostatic repulsion between them and weakens their heterogeneous condensation. is chemisorbed on the surface of pentlandite, and the adsorption strength is stronger than that of serpentine.
Key words: serpentine; pentlandite; heterogeneous condensation; sodium tungstate; flotation
