摘要
矿物表面粗糙度是影响浮选效果的重要因素。表面粗糙度会影响矿物的疏水性、药剂的吸附以及颗粒–气泡间液膜的破裂,对颗粒–气泡相互作用过程产生显著影响。然而,目前缺乏关于粗糙度影响颗粒–气泡相互作用过程相关研究工作的系统评述。为此,首先梳理了表面粗糙化修饰技术及粗糙度测试方法。其次,从浮选动力学、接触角、三相接触线形成时间、颗粒–气泡相互作用力4个方面系统地论述了粗糙度对颗粒–气泡相互作用过程的影响,明确了粗糙度尺度这一概念对于颗粒–气泡相互作用研究的重要性;基于粗糙度尺度与矿物表面疏水性在颗粒–气泡相互作用过程中的耦合机制,提出了矿物表面润湿状态在粗糙表面与气泡相互作用过程的重要性,并分析讨论了目前粗糙度对接触角、浮选效果的影响研究结论不一致的原因。最后,通过批判性分析和综述文献研究结果得出结论,并对未来的研究发展方向进行了展望。有助于更好地理解矿物表面粗糙度对浮选过程的影响,可以为调控矿物表面粗糙度创造有利的浮选条件,提高浮选的效率和选择性提供理论支撑。
Mineral surface roughness is an important factor affecting flotation efficiency.Surface roughness can affect the hydrophobicity of minerals,the adsorption of reagents,and the rupture of liquid films between particles and bubbles,resulting in a significant impact on the interaction process between particles and bubbles.However,there is currently a lack of systematic review work on the influence of roughness on particle-bubble interaction process.Therefore,the authors firstly reviewed the surface roughening modification techniques and roughness testing methods.Secondly,the influence of roughness on the particle-bubble interaction process was systematically discussed from four aspects:flotation kinetics,contact angle,formation time of triple-phase contact line,and interaction force between particles and bubbles.The concept of roughness scale was proposed for its importance in the research of particle-bubble interactions.Thirdly,based on the coupling mechanism between roughness scale and mineral surface hydrophobicity in the particle-bubble interaction pro-cess,the importance of mineral surface wetting state in the interaction process between rough surfaces and bubbles was emphasized.The reasons for the inconsistent research conclusions on the impact of roughness on contact angle and flota-tion performance were also analyzed and discussed.Finally,the conclusions were drawn through critical analysis and liter-ature review,and the prospects for future research directions were outlined.This paper contributes to a better understand-ing of the influence of mineral surface roughness on the flotation process,and can provide a theoretical support for regulat-ing mineral surface roughness to create favorable flotation conditions and improve the flotation efficiency and selectivity.
作者
卜祥宁
童正
孙玉金
谢广元
董宪姝
BU Xiangning;TONG Zheng;SUN Yujin;XIE Guangyuan;DONG Xianshu(Key Laboratory of Coal Processing and Efficient Utilization(Ministry of Education),China University of Mining&Technology,Xuzhou 221116,China;School of Chemical Engineering and Technology,China University of Mining&Technology,Xuzhou 221116,China;College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2023年第11期4171-4182,共12页
Journal of China Coal Society
基金
国家自然科学基金资助项目(52204275,52204296)
山西省回国留学人员科研资助项目(2022-059)。
关键词
粗糙表面
粗糙度测量
颗粒–气泡
接触角
相互作用力
rough surface
roughness measurement
particle-bubble
contact angle
interaction force
