聚苯乙烯纳米粒子在碳及石英表面的吸附行为研究  

Adsorption Behavior of Polystyrene Nanoparticles on Carbon and Quartz Surfaces

作　　者：江宁 孙玉金 董宪姝[1] 马晓敏 樊玉萍[1] JIANG Ning;SUN Yujin;DONG Xianshu;MA Xiaomin;FAN Yuping(College of Mining Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China)

机构地区：[1]太原理工大学矿业工程学院,山西太原030024

出　　处：《矿业研究与开发》2022年第11期62-66,共5页Mining Research and Development

基　　金：国家自然科学基金项目(51820105006,52074189,52004178);山西省面上青年基金项目(201901D211039).

摘　　要：聚苯乙烯(PS)纳米粒子可作为捕收剂用于煤泥的浮选,但由于吸附选择性较差导致药剂消耗量过大,因此探索PS纳米粒子在碳及石英表面的吸附行为对于降低纳米粒子浮选时在非目的矿物表面的吸附,从而达到减少药剂用量以降低成本具有重要意义。采用乳液聚合法制备出阳离子型PS纳米粒子,采用耗散石英微晶天平(QCM-D)研究了不同条件下纳米粒子在碳表面与石英表面的吸附脱附行为。结果表明,不同条件下粒子均会在石英表面及碳表面产生不可逆的吸附,且前者吸附量约为后者的2/5,这解释了为何实际浮选过程中药剂消耗量较大的原因;减小乳液固含量对于抑制粒子在碳表面上吸附更为明显,因此在实际浮选过程中通过降低固含量进而抑制粒子在非目的矿物表面的吸附并不可取;酸性(pH为5)和碱性(pH为9)条件对于纳米粒子在石英表面上的吸附效果起到抑制作用,因此浮选时调控pH为7的矿浆环境更有利于粒子在煤颗粒表面的吸附;随着吸附量的增大,碳及石英表面的吸附层都变得更为密实,且碳表面的密实度均小于石英表面的密实度,较高固含量或中性环境在促进碳表面吸附的同时,吸附层构型也变得更为松散,但水流的冲洗始终不足以克服粒子的吸附能垒造成脱附现象。Polystyrene(PS)nanoparticles can be used as collectors for slime flotation,but the poor adsorption selectivity leads to excessive reagent consumption.Therefore,exploring the adsorption behavior of PS nanoparticles on carbon and quartz surfaces is of great guiding significance to reduce the adsorption of nanoparticles on the surface of non target minerals during flotation,so as to reduce the dosage and save the cost.The cationic PS nanoparticles were prepared by emulsion polymerization.The adsorption and desorption behaviors of nanoparticles on carbon and quartz surfaces under different conditions were studied by using the quartz crystal microbalance with dissipation monitoring(QCM-D).The results are concluded as follows.Firstly,under different conditions,particles will produce irreversible adsorption on carbon and quartz surfaces,and the adsorption capacity of the former is about 2/5of the latter,which explains why the consumption of traditional medicine is large in the actual flotation process.Secondly,reducing the solid content of the emulsion is more obvious to inhibit the adsorption of particles on the carbon surface.Therefore,it is not advisable to reduce the solid content and inhibit the adsorption of particles on the surfaces of the non target minerals in the actual flotation process.Thirdly,acidic(pH=5)and alkaline(pH=9)conditions can inhibit the adsorption effect of nanoparticles on the quartz surface.Therefore,the pulp environment with pH 7 during flotation is more conducive to the adsorption of particles on the coal particle surface.Fourthly,with the increase of adsorption capacity,the adsorption layer on carbon and quartz surfaces becomes more dense,and the compactness of the carbon surface is less than that of the quartz surface.While the high solid content or neutral environment promotes the adsorption on the carbon surface,the configuration of the adsorption layer also becomes more loose,but the washing of water flow is always insufficient to overcome the desorption phenomenon caused by the adsorpt

关 键 词：聚苯乙烯 纳米粒子 碳 石英 表面吸附 

分 类 号：TD923.13[矿业工程—选矿]