摘要
为研究微纳米气泡对矿物浮选行为的影响,将微纳米气泡发生器与单槽浮选机相结合,采用仲辛醇作为稳泡剂(用于微纳米气泡发生器的微泡生成和稳定过程),以500~710μm,250~500μm和-250μm共3种粒度的屯兰煤作为研究对象,进行微泡浮选试验。结果显示微泡处理对于500~710μm的粗粒度煤和250~500μm中等粒度煤,具有显著的提升效果,且随捕收剂用量的降低和煤样粒度的增加,其提升效果越显著;对于500~710μm的屯兰煤,可燃体回收率最高可提升13.31%。研究表明,颗粒与气泡之间的疏水作用力是诱发颗粒与气泡粘附的关键因素,而微纳米气泡桥接过程会产生很强的长程疏水作用力,其作用距离可达几百纳米,而通常短程疏作用水能距离不到20nm,且疏水作用能通常比颗粒间的静电作用能以及范德华作用能大10~100倍。因此通过引入微纳米气泡浮选,可以提高粗颗粒与气泡的粘附能力,降低粗颗粒的脱落概率。
In order to study the influence of micro-nano bubbles on mineral flotation behavior,the micro-nano bubble generator was combined with a single cell flotation machine,and sec-octyl alcohol was used as a bubble stabilizing agent(used in the micro-bubble generation and stabilization process of the micro-nano bubble generator).Then,Tunlan coal with three particle sizes of 500~710μm,250~500μm and-250μm was used as the research object to carry out micro-bubble flotation tests.The results show that the microbubble treatment has a significant lifting effect on coarse Tunlan coal of 500~710μm and medium-sized Tunlan coal of 250~500μm.With the decrease of collector dosage and the increase of coal sample size,the lifting effect is more significant.For Tunlan coal of 500~710μm,the combustible recovery rate can be increased by 13.31%.Studies have shown that the hydrophobic interaction between particles and bubbles is the key factor to induce the adhesion between particles and bubbles,and the bridging process of micro-nano bubbles will produce a strong long-range hydrophobic interaction,with an interaction distance reaching several hundred nanometers,while the short-range hydrophobic interaction energy is usually less than 20 nm,and the hydrophobic interaction energy is usually 10~100 times larger than the electrostatic interaction energy and Van der Waals interaction energy between particles.Therefore,by introducing micro-nano bubble flotation,the adhesion between coarse particles and bubbles can be improved and the probability of coarse particles falling off can be reduced.
作者
韩峰
刘安
樊民强
HAN Feng;LIU An;FAN Minqiang(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
2020年第9期111-116,共6页
Mining Research and Development
基金
国家自然科学基金资助项目(51704208)。
关键词
煤
浮选
微纳米气泡
矿物粒度
回收率
Coal
Flotation
Micro-nano bubble
Mineral particle
Recovery rate
作者简介
韩峰(1995-),男,山东泰安人,硕士研究生,主要研究方向为矿物浮选,E-mail:695274431@qq.com;通信作者:樊民强(1964-),男,山西永济人,教授,博士生导师,主要研究方向为矿物加工工艺理论与技术,E-mail:fanminqiang@tyut.edu.cn。
