新型细粒浮选柱的研究

基于Jameson浮选柱的下导管充气与矿化技术,作者设计了1套新型细粒浮选柱的实验室装置系统.试验结果表明,在同等试验条件下,无论是精矿品位还是回收率,新型细粒浮选柱都高于Jameson射流浮选柱和XFD机械搅拌浮选机.     

新型细粒浮选柱的研究

基于Jameson浮选柱的下导管充气与矿化技术,作者设计了1套新型细粒浮选柱的实验室装置。试验结果表明,在同等试验条件下,无论是精矿品位还是回收率,新型细粒浮选柱都高于Jmneson射流浮选柱和XFD机械搅拌浮选机。     

高效细粒浮选柱

在充分研究Jameson浮选柱的基础上,结合“矿浆适度紊动”比“矿浆静态”更有利于细粒浮选的新观点,设计高效细粒浮选柱的实验室装置系统并从几方面分析高效细粒浮选柱的高效机理。细粒铝铋回收试验表明,在同等试验条件下,无论是精矿品位还是回收率,高效细粒浮选柱都高于Jameson射流浮选柱和XFD机械搅拌浮选机。     

文摘与简讯

铅-锌选厂中间回路的泡沫分选 1976年在阿尔玛雷克矿冶公司进行了充气式泡沫分选浮选机16的工业试验。安装在铅-锌选厂一个系统中作为铅-锌混合浮选之中间回路的4槽16浮选机与12槽“米哈诺布尔6 B”(M-6 B)机械搅拌式浮选机进行了对比试验。 16浮选机的技术特性:     

充气式浮选机和机械搅拌式浮选机串联使用在赵楼选煤厂的生产实践

介绍了赵楼选煤厂的浮选系统,分析了入浮煤泥的性质,比较了KHD型充气式浮选机和XJM-S型机械搅拌式浮选机的设备性能和应用情况,阐述了两者串联的浮选工艺流程。生产工艺指标表明:串联浮选工艺应用效果良好,使浮选精煤得到了有效的分选回收。     

浮选机改进的展望

在世界各国的浮选实践中,叶轮式(机械搅拌式和压气机械搅拌式)浮选机获得了最广泛的应用。同早先许多老选厂里应用的压气式浮选机及气升式浮选机比较,其优点在于:单位生产能力较高;使用更可靠;能有效地用于按复杂流程浮选多组分矿石,而不需要装输送浮选产品的泵送设备以及流程中处理药剂的搅拌装置。近年来,为了提高单位生产能力,对增大浮选槽的容积和改进浮选机的主要工作构件一充气器,给予了颇大的注意。多槽机械搅拌式浮选机的浮选槽容积从6米~3增加到了42     

五年来Ekoflot充气式浮选机的发展

浮选是细粒共生矿物分选的中心环节,虽然这种工艺的生产费用比较高,但却带来经济效益。故浮选机的研制一直受到特别重视。一般用分选精度作为评价浮选机结构合理性的主要标准有时也仅以可靠性作为主要的评定标准,大概也就是可靠性才确定了目前机械搅拌式浮选机的统治地位。然而,随着时代的变化,充气式浮选机很快占据了市场。目前许多类型的充气浮选机与机械搅拌式浮选机相比,不仅分选精度高,而且在可靠性方面也可与搅拌式浮选机相媲     

新型细粒浮选柱的研究

有新的理论认为,“矿浆有适度紊动”比“矿浆静态”更有利于细粒的分选。基于此新理论,设计了一套新型细粒浮选柱的实验室装置系统,并进行室内小型浮选试验。试验结果表明,在同等试验条件下,无论是精矿品位还是回收率,新型细粒浮选柱都高于Jameson射流浮选柱和XFD机械搅拌浮选机。介绍了新型细粒浮选柱的结构和工作原理。     

旋流微泡浮选柱和机械搅拌式浮选机工艺效果对比

简要介绍了邢台矿选煤厂煤泥处理工艺流程,详细分析了浮选柱与浮选机各自的分选原理和特点,并根据邢台矿选煤厂工艺流程和入浮煤泥性质,通过对选前脱泥与不脱泥重介条件下旋流微泡浮选柱和机械搅拌式浮选机浮选工艺效果的分析,对比了两种浮选设备的分选工艺效果。     

160m^3充气机械搅拌式浮选机

浮选机是矿物加工过程中最重要的分选设备之一，浮选设备的大型化已成为国际潮流。国际上浮选机单槽容积达到200m^3，我国此前达到130m^3。北京矿冶研究总院所研制成功的浮选机单槽最大容积达到160m^3，是目前我国最大的浮选机。160m^3充气机械搅拌式浮选机槽体为圆筒形：槽体截面为圆形，矿浆分散均匀；每槽内设有2个圆形泡沫槽和1个泡沫锥，内泡沫槽兼有推泡作用，浮选泡沫溢流入泡沫溜槽内；     

Effect of Jameson cell operating variables and design characteristics on quartz-dodecylamine flotation system

The Jameson cell is a relative newcomer to separation science and technology. Its mode of operation and mechanisms differ drastically from the other flotation machines. It has a number of unique parameters affecting flotation performance. An experimental investigation of Jameson cell operating variables and some design features was carried out within the quartz-dodecylamine flotation system. These parameters included jet length, bias, % solids, downcomer plunge length, and tank diameter studied for up to three different particle size groups (i.e., −250 + 106, −106 + 53 and −53 μm). The recovery of the medium and coarse size particles dropped by 10–15% as the free jet length increased, while that of fines was nearly independent of it. The bias factor negatively affected the recovery of all three size groups almost by same proportion. The effect of the downcomer plunging length on recovery was generally negative, but it was significant only for the coarsest size groups when the plunging length was beyond 50 cm. These negative effects on flotation recovery were mostly attributed to turbulence and its particle size dependent characteristics.     

Velocity gradient and maximum floatable particle size in the Jameson cell

Due to efficient flotation of fine particle in the Jameson cell, it has been used in more than two hundred flotation plants since 1986. However, the performance of the Jameson cell decreases with the increase in the particle size in the feed. In some plants, coarse particles have to be fed to the Jameson cell because of operational and maintenance issues. Therefore, it is necessary to find the reasons of decrease of the cell performance caused by coarse particles as well as possible solutions of the problem.The present study has been carried out to delineate coarse particle flotation in the Jameson cell from a hydrodynamic point of view. In the study, flow characteristics of the fluid discharging from the downcomer to the separation tank have been investigated and a mathematical model, which can predict the velocity gradient, referred to as turbulence, has been developed in terms of fluid mechanics principles. Furthermore, experiments have been carried out to determine the maximum size of floating particle (d_max) using the developed model and experimental findings.     

Performance optimization of Jameson flotation technology for fine coal cleaning

A performance optimization study has been conducted using a laboratory Jameson Flotation Cell, which resulted in the development of empirical models for four key response parameters, such as product ash content, product total sulfur content, combustible recovery and separation efficiency. The empirical models were utilized to identify an appropriate experimental region to achieve a target set of metallurgical performances from the treatment of a flotation feed sample. The separation performance obtained from the treatment of three additional coal samples used in this investigation indicate that a high positive bias factor of about 0.6, which translates to a wash water ratio of 2.5, is required to produce superior quality coal especially from the treatment of high ash coals. The separation performance obtained using the same orifice—downcomer combination with various size separation chambers indicate that the diameter of the separation chamber of the Jameson Cell can be potentially reduced without affecting the separation performance. In other words, more number of downcomers can be used with the same size cell, which will significantly improve the throughput capacity of the Jameson flotation technology without sacrificing the separation performance.     

A comparative evaluation of the leading advanced flotation technologies

A comparative evaluation has been conducted using three leading advanced flotation technologies, which utilize different types of bubble-particle attachment environment. Based on a statistical evaluation of the test data the Packed-Column technology, which provides a near plug-flow flotation environment due to the presence of corrugated packing material in the cell, produced the best separation performance due to its ability to support an extremely deep froth zone. However, because of the absence of an air sparging system and the consequent larger bubbles, the froth carrying capacity was the mininum with the Packed-Column technology. On the other hand, the throughput capacity achieved by the Jameson Cell technology, which has a self air-inducing co-current system that provides an intimate bubble-particle attachment environment characterized by an extremely high air fraction and ultrafine bubbles, was found to be maximum. The Microcel^™ technology achieved its maximum carrying capacity while providing a high energy recovery with a reasonably low reagent consumption.     

680m~3浮选机工业化应用过程中的动力学性能测试与分析

680m~3浮选机投入生产试运行已一年有余,表现出卓越的设备稳定性和分选性。本文从浮选流体动力学角度出发,对680m~3浮选机在带矿运行过程中的充气性能、矿浆循环悬浮性能和气泡大小及其负载性能进行了测试分析。结果表明,680m~3浮选机充气量可以达到1.1m~3/(m~2·min)以上,能够满足一般硫化矿大气量的生产需求,空气分散度在7以上,平均气含率约7%;不同深度浮选槽内矿浆浓度和粒级分布较为均匀,无明显分层现象。气泡表面积通量可达39.20s-1,随着气泡的上浮,气泡负载呈现上升趋势,最高可达3.37g/L。优越的浮选流体动力学特性充分地保障了680m3浮选机良好的分选效果。     

Evaluation of alternative flotation technologies for copper cleaning & copper/nickel separation at Inco's Thompson mill

At Inco's Thompson Mill the predominant nickel and copper minerals are pentlandite and chalcopyrite respectively. Following bulk sulphide flotation, where soda ash is added as the pH modifier, sodium amyl xanthate as the collector and MIBC as the frother, slaked lime is added to depress the pentlandite and effect copper/nickel separation.Pursuit of an overall improvement of copper/nickel separation resulted in the pilot testing of column, Jameson and Outokumpu HG flotation cells. The pilot plants were run in parallel with the existing Denver DR30 flotation cells. The paper compares the metallurgical performance of the various flotation devices when applied to copper/nickel separation and copper cleaning. Based on copper/nickel and copper/gangue separation efficiencies, columns are shown to be the superior flotation device.     

Adsorbing colloidal flotation removing metals ions in a modified jet cell

The removal of Cu²⁺, Zn²⁺ and Ni²⁺ ions from synthetic wastewater with a modified Jameson cell (MJC) was studied using adsorption colloidal flotation (ACF). A colloidal dispersion of Fe (OH)₃ (formed in situ from FeCl₃) at pH 11 was used as an adsorbent colloid to ensure full adsorption and precipitation. The precipitates were flocculated with polyacrylamide and hydrophobised with sodium oleate and pine oil as a frother during the flotation stage. In the modified jet cell, the downcomer was sealed at the bottom with a diffuser, and the re-flotation of detached flocs and the probability of bubbles/particles capture was enhanced, which improved the recovery rate. As a result, the modified Jameson cell was more efficient (higher loaded carrier recoveries) than the conventional jet cell (CJC) in removing heavy metals ions. The physico-chemical characteristics, cell design and operating parameters were studied, and the removal efficiency was evaluated by monitoring the final concentration of ions in the treated effluent. The results indicated that the removal efficiencies of the MJC were approximately 95% and 98% for dilute (Cu²⁺, Zn²⁺ and Ni²⁺ concentration of 2 mg/L) and concentrated wastewater (25 mg/L of each ion), respectively. The optimal parameters included a Fe⁺³/ion ratio of 0.5 and a minimum air flow-rate/feed flow-rate ratio of 0.18. The results are discussed in terms of the physical and physico-chemical parameters, and the findings suggested that the proposed flotation technique has great potential for the treatment of wastewater.     

The effect of particle size and some operating parameters in the separation tank and the downcomer on the Jameson cell recovery

The aim of this work is to investigate the effect of some operating variables and particle size on the Jameson cell performance. This is done by investigating the effect of varying different parameters such as concentrate flow rate and immersion depth of the downcomer for separation tank recovery, while jet length, jet velocity and holdup within the downcomer are used for downcomer recovery. It was found that altering these parameters play a significant role in recovery of different sized particles. An increase in concentrate flow rate and a decrease in immersion depth result in much more improving effect on recovery as particle size increases. An increase in jet length, jet velocity and holdup results in the recovery improvement for fine particles and loss of recovery for medium/coarse particles.     

Correlation of air recovery with froth stability and separation efficiency in coal flotation

Recent research progress in hard rock mineral flotation shows that froth stability can be represented by air recovery, which is defined as the fraction of air entering a flotation cell that overflows the weir in unburst bubbles, and that air recovery has strong correlation with the separation performance of mineral flotation. Yet no experimental work on air recovery has been devoted to coal flotation. This paper studies air recovery in coal flotation and examines the links between air recovery, froth stability and coal flotation performance. A series of experiments were conducted using a laboratory-scale mechanical flotation cell at various methyl isobutyl carbinol (MIBC) concentrations and aeration rates. It was found that air recovery has a strong correlation with dynamic froth stability determined by measuring the maximum froth height in a non-overflowing froth column. At a fixed aeration rate (hydrodynamic condition) and various MIBC concentrations, a strong correlation between air recovery and coal flotation performance was also observed.     

泡沫浮选在生化分离技术中的应用

综述了泡沫分离技术的研究进展 ,介绍了分离过程中操作参数 (气流速度、泡沫区高度、液相高度、温度 )、溶液体系性质 (进料浓度、pH值、离子强度、表面活性剂种类 )、分离设备等因素对分离效果的影响 ,并介绍了泡沫分离在固体粒子、溶液中的离子分子、废水处理以及生物产品的分离过程中的应用 ,指出了泡沫分离技术目前存在的问题及发展方向。