摘要
为研究射流-搅拌耦合式浮选装置内药剂在煤泥颗粒表面的吸附,强化煤粒改性效果,利用Fluent软件模拟耦合式浮选装置流场,分析流体应变速率、最小涡尺度及湍流动能等流体动力学参数,试验研究不同入料压力调浆后煤粒表面捕收剂吸附密度、表面疏水性及浮选动力学特征.结果表明:随入料压力增加,流体应变速率逐渐增加,最小涡尺度逐渐减小,驱动叶轮处流体应变速率显著高于其他位置,且此处最小涡尺度最小;搅拌叶轮和驱动叶轮处湍流动能较高,最小涡尺度较小,应变速率较高;煤泥颗粒表面捕收剂吸附密度、接触角、浮选动力学常数和最大可燃体回收率均随入料压力的增加而增加,入料压力为0.24 MPa时,试验值最大,捕收剂吸附密度、煤样接触角、浮选速率常数和可燃体回收率分别为0.93 mg/g,95.91°,0.0458 s^(-1)和89.27%,之后下降,射流-搅拌耦合式浮选装置最佳煤泥浮选入料压力为0.24 MPa.
In order to study the adsorption of collectors on the surface of coal slime particles using a jet-stirring coupling flotation device to enhance the modification effect of coal slime particles surface.The fluid dynamics parameters of fluid strain rate,Kolmogorov scale and turbulent kinetic energy were calculated using the Fluent software in the flotation device.The collector adsorption density,surface hydrophobicity,and flotation kinetics of coal particles after pulp conditioning with different feeding pressures were analyzed to verify the effect of flotation device on modification of coal particles.The results show that with the increase of the feeding pressure,the fluid strain rate increases gradually,in contrast,the Kolmogorov scale decreases gradually,and the fluid strain rate at the position of driving impeller is significantly higher than that at other positions,the Kolmogorov scale here is the smallest.The turbulence kinetic energy is higher,the Kolmogorov scale is smaller,and the strain rate is higher at the positions of driving impeller and stirring impeller.The collector adsorption density,contact angle,flotation kinetic constant,and combustible recovery increase with the feeding pressure increased to 0.24 MPa and above which those decrease.Hence,the optimum feeding pressure of pulp conditioning is 0.24 MPa with the collector adsorption density,contact angle,flotation kinetic constant and maximum combustible recovery are 0.93 mg/g,95.91°,0.0458 s^(-1)and 89.27%,respectively.
作者
韩有理
王星
朱金波
朱宏政
王坡
HAN Youli;WANG Xing;ZHU Jinbo;ZHU Hongzheng;WANG Po(College of Material Science and Engineering,Anhui University of Science and Technology,Huainan,Anhui 23200l,China;State Key Laboratory of Ming Response and Disaster Prevention and Control in Deep Coal Mines,Anhui University of Science and Technology,Huainan,Anhui 232001,China;Linhuan Coal Preparation Plant of Huaibei Mining Group,Huaibei,Anhui 235000,China)
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2023年第2期380-388,416,共10页
Journal of China University of Mining & Technology
基金
安徽省高校自然科学基金资助项目(KJ2020A0303)
国家自然科学基金资助项目(52074014)
安徽理工大学引进人才科研启动基金资助项目(13200419)。
关键词
浮选
射流-搅拌
煤泥调浆
数值模拟
强化
flotation
jet-stirring
coal slurry conditioning
numerical simulation
enhancement
