充填浮选柱捕集区气含率的试验研究

通过冷模试验方法考察了充填浮选柱捕集区的气含率，经试验数据回归分析，气含率εｇ＝０．０９６Ｊｇ０．９１（Ｈｃ／Ｄ）－０．１８。并结合漂移通量的理论，确定充填浮选柱的捕集区为近似均匀鼓泡流。     

气含率与浮选动力学常数的研究

气含率大小是决定浮选柱回收能力和分选效果的重要参数之一,浮选柱内气含率直接决定了气泡荷载上浮矿物的数量与质量,从而决定了浮选过程中精矿的产率和回收率。本文考察了磷矿在充填浮选柱的浮选过程中,表观气体流速和矿浆质量分数对充填浮选柱捕集区气含率的影响。将浮选过程中的气含率与浮选动力学常数相联系,并结合充填浮选柱的工艺特征,推导出了具体的关联式。     

充填式浮选柱的研究与应用

简要介绍了充填式浮选柱的发展历程及其特点 ,综述了近年来国内外学者对该设备的内部结构、流体力学特性、数学模型等基础理论的研究状况 ,以及充填式浮选柱在金属矿、煤、非金属矿等分选工艺中的主要应用情况 ,指出了目前所存在的一些有待解决的问题 ,并从基础理论和实际应用两个方面提出了几个有待进一步深入研究的课题和发展方向     

充填浮选柱正-反浮选胶磷矿工艺研究

通过充填浮选柱浮选胶磷矿的工艺实验,提出了串联操作的正一反浮选流程,得到了较为合适的工艺条件,为生产放大提供了理论依据。     

填料在充填浮选柱中的应用及研究

介绍了化工填料在浮选柱的应用及研究情况,探讨了填料在浮选柱中所起的作用,说明了今后的研究方法及方向。     

用人工神经网络方法预测鼓泡塔气含率

A new correlation for the prediction of gas hod up in bubble columns was proposed based on an extensive experimental database set up from the literature published over last 30 years .The updated estimation method relying on artificial neural network,dimensional analysis and phenomenological approaches was used and the model prediction agreed with the experimental data with average relative error less than 10%.     

充填式浮选柱二维返混特性的实验研究

以二维扩散模型为基础，采用点源脉冲示踪法对开式浮选柱和装有不同类型规整填料的充填式浮选柱内液相的轴向与径向返混进行了实验研究，得到了各种填料内轴向和径向彼克列准数与气相、液相表观雷诺数的关联式。通过比较发现，在所用填料中，装有250Y或350Y型填料的浮选柱不仅轴向返混最小，而且径向返混最大，最有利于提高回收率。另外，对起泡剂的影响进行了实验研究，发现起泡剂可以减小返混，但当起泡剂浓度大于一定值时反而会增大径向返混。     

充填浮选柱分选胶磷矿的工艺研究

充填浮选柱是一个复杂的气液固三相体系。本文考查了用充填浮选柱分选胶磷矿的主要操作参数的影响，讨论了Ｐ２Ｏ５的品位的沿柱高的分布，证实了充填浮选柱具有优良的分选性能，并为寻求缩短胶磷矿浮选工艺流程的途径提供了依据。     

充填静态浮选柱在胶磷矿浮选中的应用

考察了在充填式静态浮选柱中浮选低品位胶磷矿时,药剂用量、洗涤水加入位置及用量及各种操作因素对浮选结果的影响,得到了合适的浮选条件,为工业放大提供了依据。     

鼓泡塔中气含率的研究

在φ100×5mm的鼓泡塔中,用空气-稀醇溶液和空气-稀酸溶液研究了包括分子中碳原子数和羟基、羧基在内的诸因素对气含率的影响。得到了气含率ε_G关联式,用于单元醇(或酸)、多元醇(或酸)的气含率计算。     

Effect of pulp fibres on gas holdup in a flotation column

Column flotation is an emerging technology in the deinking of recycled paper. Deinking efficiency depends primarily on the effect of four physical variables: gas and accepts flowrates, bubble size distribution, and pulp consistency. Experiments to establish operating ranges for these variables by determining their effect on gas holdup were conducted in a laboratory column installed at Bowater's Gatineau (Quebec) mill which processes a pulp (70% ONP/30% OMG) with about 1% consistency. The results showed the general trends expected from a review of previous studies: gas holdup increases with gas and accepts flowrates and with smaller bubble size, and decreases for higher pulp consistencies. However, the review also demonstrated that the published information is of limited application as the bubble size was much larger than that encountered in industrial flotation practice, primarily because of the use of pure water. Industrial pulps contain in most cases surface active agents which have a substantial effect on forming and preserving a small size bubble population.     

Gas holdup characteristics in a flotation column with different solids

This paper presents the effect of process variables on gas holdup. It was measured by volume expansion method in a continuously operating flotation column using coal and sphalerite. It was observed that addition of both solids reduced gas holdup. Increase in solid concentration and particle size reduced gas holdup. Also, increase in gas velocity and frother concentration increased the gas holdup as amount of gas increased and bubble surface property favored the formation of small bubbles. An empirical mathematical model was developed to predict gas holdup. The predicted results were in good agreement with the experimental and available published data.     

Improved gas holdup in novel bubble column

This investigation reports the experimental and theoretical results carried out to evaluate the gas holdup for air–water system in a novel hybrid rotating and reciprocating perforated plate bubble column under countercurrent condition. The response of this hybrid column is found to be similar to that of reciprocating plate column (RPC) showing mixer‐settler, transition, and emulsion regions. The effect of agitation level, superficial gas velocity, superficial liquid velocity, perforation diameter, and plate spacing on gas holdup is studied and found to be significant. The gas holdup is found to be least in the range of agitation level of 1.3–1.5 cm/s. For all the superficial gas and liquid velocities considered in this present investigation, the critical agitation level at minimum gas holdup remains nearly same. The gas holdup in this hybrid column is 1.2–1.7 times higher in mixer‐settler region and 2.1–2.7 times higher in emulsion region than that of RPC. Correlations have been developed and found to concur with the experimental values. It can be used with 95% accuracy. © 2011 Canadian Society for Chemical Engineering     

鼓泡塔中气泡尺寸分布和局部气含率研究

在内径为0.38 m的鼓泡塔中采用双电导探针法对不同通气速率下的气泡尺寸分布和局部气含率进行了实验研究,分析了气泡尺寸的概率密度分布。结果表明:气泡尺寸随轴向高度的增加而增大,随径向距离增加而减小;鼓泡塔中气液流动可分为过渡流域和充分发展流域,在过渡流域气含率随轴向高度增加而增大,在充分发展流域气含率趋于均值,径向局部气含率分布呈抛物线型下降。高气速下气泡尺寸概率密度分布比低气速下宽,且随轴向高度的增加分布变宽。     

拉西环填料塔体动持液量和面动持液量及其计算

首次提出填料塔动持液量不是均匀分布的，高径比是影响动持液量的一个重要参数。定义整个床层的平均动持液量为体动持液量；定义填料层中水平截面上微分薄层的平均动持液量为面动持液量。根据实验数据和优化计算方法，得出恒持液量区到泛点拉西环填料层体动持液量计算修正式和面动持液量计算式。     

中低品位磷矿柱式短流程分选试验研究

采用充填浮选柱通过正-反两段流程柱式分选云南某中低品位磷矿,考察了磨矿时间、药剂用量等工艺条件对分选指标的影响.结果表明,通过柱式短流程分选可以获得P2O5品位32.79％、回收率82.92％、MgO质量分数0.42％的精矿,且药剂用量与机械搅拌浮选机所用有差别.