摘要
随着战略性矿产资源日趋呈现“贫、细、杂”特征,微细粒浮选已成为资源高效回收的关键难题。纳米气泡凭借其独特性质,在强化微细粒浮选方面展现显著潜力,但其与浮选颗粒的适配机制尚不明确。结合微纳气泡发生系统、纳米粒子追踪分析及浮选动力学试验,系统探究了操作参数对纳米气泡特性的调控规律,以及纳米气泡对微细粒煤浮选效果的强化作用。研究结果表明,增大系统压力和进气量可显著提高纳米气泡浓度和粒径,从而提升浮选回收率和速率常数。对于D_(50)介于10.11~32.06μm的微细煤粒,回收率提升幅度超过20%,浮选速率常数提高4倍以上。其强化机制可能是源于纳米气泡诱导微细粒形成絮团,有效增大表观粒径,从而显著提升颗粒-气泡碰撞概率。对于D_(50)为100.8μm的较粗颗粒,浮选强化效果相对有限。研究结果为微细粒纳米气泡技术开发提供了重要的理论支撑和工艺优化方向。
As strategic mineral resources increasingly exhibit the characteristics of being low-grade,fine-grained,and complex in composition,the flotation of fine particles has become a key challenge for efficient resource recovery.Owing to their unique properties,nanobubbles have demonstrated significant potential in enhancing fine particle flotation.However,the compatibility mechanism between nanobubbles and flotation particles remains unclear.In this study,a systematic investigation was conducted using a micro-nanobubble generation system,nanoparticle tracking analysis,and flotation kinetics experiments to explore the regulation of nanobubble characteristics by operational parameters and the enhancement effects on fine coal flotation.The results show that increasing system pressure and gas flow rate significantly improves nanobubble concentration and size,thereby enhancing flotation recovery and rate constants.For fine coal particles with D_(50)values ranging from 10.11μm to 32.06μm,the recovery was improved by over 20%,and the flotation rate constant increased by more than fourfold.This enhancement may be attributed to the nanobubbles inducing the formation of flocs among fine particles,effectively increasing their apparent size and significantly raising the probability of particle-bubble collisions.In contrast,for coarser particles with a D_(50)of 100.8μm,the flotation enhancement effect was relatively limited.This study provides important theoretical support and process optimization directions for the development of nanobubble technology in fine particle flotation.
作者
姜涵悦
杨海昌
邢耀文
曹亦俊
桂夏辉
JIANG Hanyue;YANG Haichang;XING Yaowen;CAO Yijun;GUI Xiahui(State Key Laboratory of Coking Coal Resources Green Exploitation,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China;National Engineering Research Center of Coal Preparation and Purification,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China;School of Chemical Engineering and Technology,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China;Yunlong Lake Laboratory of Deep Underground Science and Engineering,Xuzhou 221116,Jiangsu,China;Zhongyuan Critical Metals Laboratory,Zhengzhou University,Zhengzhou 450001,China)
出处
《有色金属(选矿部分)》
2025年第9期93-100,共8页
Nonferrous Metals(Mineral Processing Section)
基金
国家自然科学基金资助项目(M-0230,52174265,52425407,52274278)
江苏省自然科学基金资助项目(BK20240106,BK20240014)。
关键词
浮选
微细粒
纳米气泡
浮选动力学
flotation
fine particles
nanobubbles
flotation kinetics
