纳米气泡的形成及其对微细粒矿物浮选的影响  

Formation of nano-bubbles and their influences on ultrafine mineral flotation

作　　者：冯其明[1] 周伟光[1] 石晴[1] 

机构地区：[1]中南大学资源加工与生物工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2017年第1期9-15,共7页Journal of Central South University:Science and Technology

基　　金：国家重点基础研究发展计划(973计划)项目(2014CB643402);国家自然科学基金资助项目(51504289)~~

摘　　要：通过1个自制的、运用水力空化原理产生纳米气泡的发生装置,研究发现纳米气泡能够强化微细粒白钨矿浮选。为了更好地认识纳米气泡的性质,运用Malvern Nano ZS 90纳米粒径电位分析仪研究放置时间、油酸钠浓度、溶液p H以及空化时间对纳米气泡尺寸分布和Zeta电位的影响。研究结果表明:纳米气泡能够在油酸钠溶液稳定存在1 h以上,具有很强的稳定性;纳米气泡尺寸随着油酸钠浓度增高而减小,随着p H增大而增大;表面电负性则随着p H的增大不断增强;超过一定时间范围后,延长空化时间对纳米气泡的尺寸并无显著影响,这可能是溶液中溶解气体在水相和气相中达到动态平衡所致。纳米气泡能够提高微细粒白钨矿的浮选速率和回收率。The enhancing effect of nano-bubbles in ultrafine scheelite flotation was studied using a homemade nano-bubble generator based on the hydrodynamic cavitation. The effects of storage time, NaOl concentration, pH value and cavitation time on nano-bubble size distribution and Zeta potential were studied through a Zetasizer nano ZS（Malvern Nano ZS 90）. The results show that nano-bubbles can be stable in NaOl solution for more than 1 h. The average size ofnano-bubble decreases with the increase of NaOl solution concentration, and increases as the pH values of solution raise. The electronegativity of nano-bubble is enhanced when pH values of solution increase. By contrast, increasing the cavitation time has no significant impact on the size of nano-bubbles beyond a certain time, probably because the dissolved gas reaches a dynamic equilibrium in liquid and gas phases in solution. Nano-bubbles in flotation can increase the flotation rate and recovery.

关 键 词：纳米气泡 水力空化 白钨矿 浮选 

分 类 号：TD952[矿业工程—选矿]