能量输入对微细粒烧绿石浮选动力学的影响  

Effect of Energy Input on Flotation Kinetics of Fine Pyrochlore

作　　者：赵兴琦 周瑜林[1] 陈雯[1] ZHAO Xingqi;ZHOU Yulin;CHEN Wen(Changsha Research Institute of Mining and Metallurgy Co.,Ltd.,Changsha 410000,China)

机构地区：[1]长沙矿冶研究院有限责任公司,长沙410000

出　　处：《有色金属（选矿部分）》2024年第11期44-52,共9页Nonferrous Metals（Mineral Processing Section）

基　　金：国家自然科学基金重点基金资助项目(92062223)。

摘　　要：能量输入是影响浮选效果的重要因素,能量输入主要由搅拌速度和搅拌时间两个关键参数决定。为探究能量输入对微细粒烧绿石浮选动力学的影响,通过浮选速率试验确定了经典一级动力学模型为微细粒烧绿石浮选过程的最佳拟合模型,考察了不同能量输入下微细粒烧绿石动力学参数,并通过光学显微镜测试和矿物表面药剂吸附量测试等方法研究不同能量输入条件下微细粒烧绿石团聚状态和表面药剂吸附量对浮选动力学影响机理。结果表明,动力学参数浮选速率常数k和理论最大回收率ε_(∞)均随着能量输入的增加呈先增大后减小的趋势,并在搅拌速度1602r/min、搅拌时间3min时取得最大值0.03878和89.7118%。聚团平均粒径和矿物表面药剂吸附量随能量输入增加变化趋势与浮选动力学参数变化趋势一致,同样在搅拌速度1602r/min、搅拌时间3min时取得最大值141.01μm和1.377mg/g。能量输入过高或过低时,动力学参数均处于较低水平。能量输入过低,团聚效果不佳、单独分散矿物较多,且矿物表面药剂吸附量较低,不利于气泡-颗粒间的碰撞与黏附。能量输入过高会破坏已经形成的聚团和表面药剂吸附层,使聚团粒径降低和药剂脱附,导致气泡-颗粒间的黏附效率降低。合适的能量输入有助于微细粒烧绿石团聚的形成,增强矿物表面药剂吸附,提高气泡-颗粒间的碰撞与黏附效率,从而提高浮选效率。Energy input is an important factor affecting flotation effect,and energy input is mainly determined by stirring speed and stirring time.In order to explore the influence of energy input on the flotation kinetics of fine pyrochlore,the classical first-order kinetic model was determined as the best fitting model for the flotation process of fine pyrochlore by flotation rate test.The kinetic parameters of fine pyrochlore under different energy input were investigated.The mechanism of the agglomeration state of fine chaste stone and the adsorption capacity of surface reagent on the flotation kinetics under different energy input conditions was studied by means of optical microscope and mineral surface adsorption.The results show that the kinetic parameters of flotation rate constant k and the theoretical maximum recovery increase first and then decrease with the increase of energy input,and the maximum values of 0.03878 and 89.7118%are obtained at the stirring speed of 1602 r/min and the stirring time of 3 min.The average particle size of the aggregates and the adsorption capacity on the mineral surface with the increase of energy input were consistent with the change trend of flotation kinetic parameters,and the maximum values of 141.01μm and 1.377 mg/g were obtained at the stirring speed of 1602 r/min and the stirring time of 3 min.When the energy input is too high or too low,the kinetic parameters are at a low level.The energy input is too low,the agglomeration effect is not good,there are more dispersed minerals,and the adsorption capacity of chemicals on the surface of minerals is low,which is not conducive to the collision and adhesion between bubbles and particles.High energy input will destroy the formed clusters and the adsorbent layer on the surface,reduce the particle size of clusters and desorption of agents,and reduce the adhesion efficiency between bubbles and particles.Appropriate energy input is conducive to the formation of fine chastocystic agglomeration,enhance the adsorption of chemicals on the

关 键 词：微细粒烧绿石 能量输入 浮选动力学 

分 类 号：TD952[矿业工程—选矿]