(中南大學(xué) 資源加工與生物工程學(xué)院，長沙 410083)
摘 要: 通過礦物浮選實驗、沉降實驗、動電位和DLVO理論計算，考察氯化鈉在蛇紋石/黃鐵礦浮選體系中的聚集/分散作用，研究氯化鈉對顆粒間的分散作用機制。結(jié)果表明：蛇紋石顆粒可通過異相凝聚作用罩蓋在黃鐵礦表面，阻礙黃藥在黃鐵礦表面吸附，影響黃鐵礦的浮選；氯化鈉的加入能增加蛇紋石與黃鐵礦顆粒間的分散性，提高黃鐵礦/蛇紋石混合礦體系中黃鐵礦的回收率。研究結(jié)果表明，在pH為8.5時，氯化鈉的濃度越高，對混合礦顆粒間的分散性越強；蛇紋石通過靜電作用吸附在黃鐵礦表面影響其浮選，氯化鈉加入壓縮雙電層，使帶相反電性的顆粒間電位絕對值顯著降低，降低靜電引力，使異相凝聚程度減弱，降低蛇紋石對黃鐵礦的抑制作用。
關(guān)鍵字: 黃鐵礦；蛇紋石；氯化鈉；分散；作用機理
（School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China）
Abstract:The aggregation/dispersion effect of sodium chloride on flotation system of serpentine and pyrite and its mechanism were studied by flotation experiments, sedimentation tests, zeta potential and calculations of DLVO theory. The results show that the serpentine particles shroud on pyrite surface by hetero-aggregation, depress the adsorption of xanthate on pyrite surface and decrease the flotation recovery rate of pyrite. The dispersion between particles of the serpentine and pyrite increases in the presence of sodium chloride. The higher concentration of sodium chloride is added, the higher dispersion exists between the particles. Sodium chloride adjusts the surface potential of serpentine through compressing double electrode layer and then disperses serpentine and pyrite, then improving the flotation performance of pyrite.
Key words: pyrite; serpentine; sodium chloride; dispersion; mechanism
