摘要
萤石与方解石表面物化性质相似,导致它们浮选分离困难。本研究系统考察植酸十二钠(SP)与油酸钠(NaOl)添加顺序对矿物浮选行为的影响。基于Zeta电位分析、红外光谱表征及聚焦光束反射测量(FBRM)等揭示SP选择性抑制2种矿物的内在机理。研究结果表明,SP对方解石的抑制效果强于萤石对方解石的抑制效果,相较于“SP+NaOl”,“NaOl+SP”加药模式更有助于实现2种矿物的选择性分离;SP在方解石表面的化学吸附强于萤石的吸附,且药剂添加顺序对其吸附行为产生差异化调控。在萤石体系中,预先添加NaOl可削弱SP的抑制作用;而方解石表面SP的强吸附特性基本不受加药顺序影响,并能有效阻碍NaOl的进一步吸附甚至造成已吸附NaOl的脱附。药剂作用顺序显著改变矿物颗粒的聚集状态;在“NaOl+SP”模式下,NaOl优先诱导萤石形成疏水聚团,而SP对颗粒的分散作用有限;在方解石体系中,SP则主导颗粒分散并抑制团聚行为。在NaOl浮选体系中,SP在2种矿物表面的吸附行为差异及其引起的矿物颗粒间聚集/分散状态差异有助于萤石与方解石的浮选分离。
Fluorite and calcite are challenging to differentiate through the process of flotation due to the similarity of their surface physicochemical properties.The effect of the addition sequence of sodium phytate(SP)and sodium oleate(NaOl)on the flotation behaviour of the minerals was systematically investigated.The intrinsic mechanism of selective inhibition of the two minerals by SP was subsequently revealed through Zeta potential analysis,infrared spectral characterization and focused beam reflection measurement(FBRM).The results show that the inhibition effect of SP on calcite is stronger than that of fluorite,and the dosing mode of"NaOl+SP"is more effective in achieving the selective separation of the two minerals compared with"SP+NaOl".The chemical adsorption of SP on the calcite surface is stronger than that of fluorite,and the order of addition of chemicals differentially regulates its adsorption behavior.In the fluorite system,the pre-addition of NaOl can weaken the inhibition of SP,while the strong adsorption of SP on the calcite surface is basically unaffected by the order of addition and can effectively hinder the further adsorption of NaOl or even cause the desorption of the adsorbed NaOl.The order of addition of agents significantly alters the aggregation state of mineral particles.In the"NaOl+SP"mode,NaOl preferentially induces the formation of hydrophobic agglomerates of fluorite,while SP exhibits a limited dispersing effect on the particles.In the calcite system,SP dominates the dispersion of particles and inhibits their agglomeration behaviour.The disparity in the adsorption behaviours of SP on the surfaces of the two minerals,and the induced differences in the state of aggregation and dispersion of the mineral particles,contribute to the flotation and flotation separation of fluorite and calcite in the NaOl flotation system.
作者
张艺扬
周伟光
孙伯柠
何徐翰
李维康
彭耀丽
ZHANG Yiyang;ZHOU Weiguang;SUN Boning;HE Xuhan;LI Weikang;PENG Yaoli(School of Chemical Engineering and Technology,China University of Mining and Technology,Xuzhou 221116,China;Yunnan Key Laboratory of Green Separation and Enrichment of Strategic Mineral Resources,Kunming University of Science and Technology,Kunming 650093,China)
出处
《中南大学学报(自然科学版)》
北大核心
2025年第5期1738-1748,共11页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(52104280)
云南省战略金属矿产资源绿色分离与富集重点实验室开放基金资助项目(202205AG070012)。
关键词
植酸十二钠
萤石
方解石
油酸钠
浮选分离
sodium phytate
fluorite
calcite
sodium oleate
flotation separation
