(東北大學(xué) 資源與土木工程學(xué)院，沈陽(yáng) 110819)
摘 要: 在含有蛇紋石的礦石浮選過(guò)程中，蛇紋石易泥化并吸附于其他礦物表面，從而降低其他有用礦物的可浮性，惡化浮選環(huán)境。在硼鎂石浮選過(guò)程中，蛇紋石可對(duì)硼鎂石回收率產(chǎn)生較大影響。通過(guò)DLVO理論，對(duì)蛇紋石、硼鎂石在礦漿中團(tuán)聚吸附本質(zhì)及其相互作用機(jī)理進(jìn)行深入探討。結(jié)果表明：礦物顆粒粒度及pH值都能對(duì)顆粒間作用行為產(chǎn)生影響，但是后者才是主要影響因素，其本質(zhì)是pH值改變礦物顆粒表面荷電狀態(tài)。不同pH值條件下，顆粒間表現(xiàn)出不同的作用行為。pH值為9.0時(shí)，蛇紋石與硼鎂石顆粒間、蛇紋石顆粒間及硼鎂石顆粒間相互吸引，易產(chǎn)生團(tuán)聚現(xiàn)象。當(dāng)pH值為11.0時(shí)，顆粒狀態(tài)隨顆粒間距離而變化，顆粒間距離為2.5~12.5 nm時(shí)，呈現(xiàn)出分散狀態(tài)；當(dāng)顆粒間距離小于2.5 nm或大于12.5 nm時(shí)顆粒間相互團(tuán)聚。
關(guān)鍵字: 蛇紋石；硼鎂石；浮選；團(tuán)聚；分散；DLVO理論
（School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China）
Abstract:During the flotation process with serpentine in the pulp, serpentine is prone to form slime and absorb to the surface of other minerals, leading to decrease of floatability of target minerals. In the process of ascharite flotation, serpentine has significant influence on ascharite recovery. The aggregation and dispersion phenomenon in the pulp, and the mechanism of particles interaction between serpentine and ascharite were investigated based on DLVO theory. The results show that both particle size and pH value of pulp can influence the particles interaction behavior, and the latter is the main influence factor. The basic reason is that the surface charges can be changed by pH values. In different pH value, particles assume different flotation behaviors. At pH of 9.0, aggregation occurs in the same particles of serpentine and ascharite particles, and it also happens between serpentine and ascharite particles; at pH of 11.0, particles interaction is extremely complicated, particles interaction behaviors vary with particles distance. Dispersion occurs while the ascharite particle distance between 2.5 and 12.5 nm. However, while the particle distance of less than 2.5 nm or larger than 12.5 nm, agglomeration is dominated.
Key words: serpentine; ascharite; flotation; agglomeration; dispersion; DLVO theory
