摘要
常规浮选的粒度上限仅150μm左右,提升浮选粒度上限不但可以降低磨矿能耗,还能在粗粒条件下通过预选抛尾实现矿石预富集。但粗颗粒以低解离连生体为主,气泡在此类表面的粘附动力学行为及调控机制尚不清晰,导致粗粒浮选回收率低、有价矿物损失。针对此问题,通过高速动态观测与MATLAB图像处理,研究了3种尺寸气泡(550、750和950μm)在4种含离散疏水位点亲水表面(疏水位点直径100μm,疏水位点边距依次为40、100、200和400μm)上的液膜破裂和铺展行为,发现气泡三相接触线(TPC)形成时间皆与疏水点边距正相关,且TPC平均铺展速度和铺展直径与疏水点边距负相关,即疏水点边距增大不利于气泡粘附及后续铺展;随着气泡尺寸增大,疏水点分布离散度对TPC铺展的阻碍作用减小,表明增大气泡尺寸一定程度上驱动了TPC的铺展。研究结果有望为粗颗粒浮选过程强化提供一定的理论支撑。
The upper limit of particle size for conventional flotation is only around 150μm.Raising the upper limit of flotation particle size can not only reduce grinding energy consumption but also achieve pre-enrichment of ore through pre-selection and tailings rejection under coarse particle conditions.However,coarse particles are mainly poorly-liberated composites,and the adhesion kinetics behavior and regulation mechanism of bubbles on such surfaces are still unclear,resulting in low recovery rates of coarse particle flotation and loss of valuable minerals.To address this issue,this paper studied the liquid film rupture and spreading behavior of three bubble sizes(550,750,and 950μm)on four hydrophilic surfaces with discrete hydrophobic sites(hydrophobic site diameter 100μm,and hydrophobic site spacings of 40,100,200,and 400μm,respectively)through high-speed dynamic observation and MATLAB image processing.It was found that the formation time of the three-phase contact line(TPC)of the bubble was positively correlated with the hydrophobic site spacing,and the average spreading speed and spreading diameter of the TPC were negatively correlated with the hydrophobic site spacing,indicating that an increase in hydrophobic site spacing is not conducive to bubble adhesion and subsequent spreading.As the bubble size increases,the hindrance effect of the hydrophobic site distribution dispersion on the TPC spreading decreases,suggesting that increasing the bubble size on the surface to a certain extent promotes the TPC spreading.The research results are expected to provide certain theoretical support for the intensification of coarse particle flotation processes.
作者
王宪
刘欣
李世文
陈湘根
康贺
李超
WANG Xian;LIU Xin;LI Shiwen;CHEN Xianggen;KANG He;LI Chao(Henan Construction Investment Group Co.,Ltd.,Zhengzhou 450046,China;Henan Investment Group Co.,Ltd.,Zhengzhou 450046,China;China Henan International Cooperation Group Co.,Ltd.,Zhengzhou 450046,China;School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,China;Zhongyuan Energy Mining Investment and Development Co.,Ltd.,Zhengzhou 450046,China)
出处
《金属矿山》
2025年第9期128-134,共7页
Metal Mine
基金
国家自然科学基金面上项目(编号:52574326)
河南省科技攻关项目(编号:242102321176)。
关键词
非均质表面
气泡尺寸
液膜
三相接触线
heterogeneous surface
bubble size
liquid film
three phase contact
作者简介
王宪(1986-),女,工程师;通信作者:刘欣(1984-),男,高级经济师,博士。
