摘要
浮选体系中纳米气泡的引入可以有效提高微细粒矿物特别是疏水性矿物的浮选效果,而如何利用纳米气泡提高亲水性矿物的浮选效果是一个难题。以氧化石墨代表亲水性颗粒,采用原子力显微镜(AFM)直接进行纳米气泡形貌表征,通过十二烷基醇聚氧乙烯醚(AEO-15)对石墨表面进行润湿性调控,利用温差法生成界面纳米气泡,对比分析石墨经氧化、表面活性剂吸附等润湿性调控后其表面生成的界面纳米气泡形貌、数量等差异;同时通过浮选试验验证润湿性调控界面纳米气泡的生成对浮选的影响。研究结果表明:界面纳米气泡的产生与颗粒表面亲疏水性密切相关,与其形貌高度无关。相较于亲水性的氧化石墨,经表面活性剂吸附后,其表面可以产生更加密集且均一的界面纳米气泡。此外,纳米气泡的引入可以明显提高亲水性氧化石墨的浮选回收率。研究成果提供了一种亲水性颗粒表面生成界面纳米气泡的方法,对低阶煤、氧化煤等其他亲水性颗粒的浮选强化具有一定的指导意义。
The introduction of nano-bubbles in the flotation system can effectively improve the flotation of microfine minerals,especially hydrophobic minerals,but how to use nano-bubbles to improve the flotation of hydrophilic minerals is a challenge.In this paper,graphite oxide was used to represent hydrophilic particles,the nano-bubble morphology was characterized directly by atomic force microscopy(AFM),and the wettability of the graphite surface was modulated by dodecyl alcohol ethoxylate(AEO-15).The interfacial nano-bubbles were successfully generated by the temperature difference method,and the differences in the morphology and number of interfacial nano-bubbles generated on the surface of graphite after wettability modulation by oxidation and surfactant adsorption were compared and analyzed.The effect of wettability-regulated interfacial nanobubble generation on flotation was verified by flotation tests.The study results indicate that:the generation of interfacial nano-bubbles is only related to the degree of hydrophobicity on the particle surface and not to the height of the graphite morphology.Compared to hydrophilic graphite oxide,more dense and homogeneous interfacial nanobubbles can be produced on its surface after surfactant adsorption.In addition,the introduction of nano-bubbles can significantly improve the flotation recovery of hydrophilic graphite oxide.This study provides a method for generating interfacial nano-bubbles on the surface of hydrophilic particles,which has implications for the flotation enhancement of other hydrophilic particles such as low rank coals.
作者
车道昌
郭建英
谢炙轩
张雷
栗褒
刘生玉
CHE Daochang;GUO Jianying;XIE Zhiruan;ZHANG Lei;LI Bao;LIU Shengyu(College of Mining Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China)
出处
《矿业研究与开发》
CAS
北大核心
2022年第8期40-46,共7页
Mining Research and Development
基金
国家自然科学基金资助项目(21878211)
山西省应用基础研究计划青年项目(20210302124351)。
关键词
润湿性
界面纳米气泡
浮选
原子力显微镜
低阶煤
Wettability
Interface nanobubbles
Flotation
Atomic force microscope
Low rank coal
作者简介
车道昌(1995-),男,山西吕梁人,硕士研究生,主要研究方向为低阶煤浮选,E-mail:6485154@qq.com;通信作者:郭建英(1972-),女,山西大同人,博士,副教授,主要从事矿物加工过程装备研究,E-mail:gijytyut@126.com。
