铜镍尾矿浮选柱再选试验研究

为回收铜镍矿工业尾矿的镍金属元素,实现对贫细难选硫化镍矿的高效分选,以旋流-静态微泡浮选柱为分选设备,采取二粗三精的浮选工艺流程,入料镍品位为0.234%,得到镍精矿品位为2.615%,镍尾矿品位为0.219%.利用扫描电镜和能谱仪检测分选样品的种类及元素含量,采用自动定量分析测试系统MLA检测样品矿物组成和单体解离度,结果表明,损失在尾矿中的镍元素主要是呈细小粒状或脉状嵌布于脉石矿物中的镍黄铁矿、氧化镍以及部分难以用浮选方式回收的微细粒级镍黄铁矿单体,旋流静态微泡浮选柱对＜O.043mm矿物回收能力和选择性较强,易选粒级镍黄铁矿单体基本得到回收.     

磁铁矿浮选柱阳离子反浮选试验研究

采用浮选柱阳离子反浮选技术对弓长岭磁铁矿进行了浮选分离研究．通过在实验室浮选柱系统上的试验,优化确定了如下工艺和操作参数：十二胺药剂用量100g／t,循环矿浆压力0．045MPa,矿浆浓度43％,浮选时间7～8min．结果表明,在优化的工艺和操作参数条件下,通过一粗二扫开路流程分选,可得到含铁70．95％的铁精矿,尾矿铁品位可降至20．88％．该技术的研究为我国高质量铁精矿的制备提供了一条新的技术途径．     

组合药剂对方铅矿浮选性能的影响

利用纯矿物研究单一捕收剂黄药和组合药剂对方铅矿浮选行为的影响．首先确定黄药的试验条件，在此基础上添加pepa药剂，进一步考察组合药剂的最佳试验条件、Pepa药剂对方铅矿的黄药浮选有明显的活化作用、试验结果表明：组合药剂比黄药对方铅矿具有更好的捕收性能，在最佳的工艺条件下，把浮选回收率从80％提高到了96％．     

降低高冰镍浮选精矿中铜镍互含的试验研究

在人工混合矿分离试验的基础上，对某高冰镍进行了浮选分离试验；以氢氧化钠作ＰＨ调整列，含钙氧化剂调节矿浆电位，丁黄药和乙黄药组合作捕收剂的药剂制度．浮选分离后获得了铜精矿含镍３．６５％，镍精矿含铜２．４１％，互含之和６．０６％的较佳结果．     

辽宁凤城含铀硼铁复合矿分选研究

针对辽宁凤城硼铁复合矿资源,在综合测定矿石成分及其目的矿物嵌布特性的基础上开展矿物分选试验研究,采用弱磁场磁选机回收磁铁矿,应用水力旋流器、螺旋溜槽以及摇床等重选设备回收晶质铀矿物,以氧化石蜡皂作为捕收剂、Na2CO3作为矿浆pH值调整剂浮选分离硼矿物．结果表明,当磨矿细度小于0．047mm占99．26％时,铁精矿中TFe品位达到60．27％,回收率为79．21％;重选回收铀矿物效果较好,但是浮选分离指标有待大幅度提高．进一步提高目的矿物单体解离度是改善分选指标的关键．     

微细粒锂辉石矿浆流变性特征及对浮选的影响

在锂辉石选矿过程中,易产生较多的微细粒锂辉石与长石.微细粒矿物在浮选过程中易发生非选择性吸附与聚集,并形成一定的网状结构,使得矿浆流变性发生改变,从而影响锂辉石矿物的浮选效果.为了充分了解微细粒锂辉石矿浆流变性特征及对浮选的影响,采用流变特性测试、浮选试验、表面动电位测试和EDLVO理论计算的方法进行系列试验.结果表明：矿物粒度的减小,会提高流体屈服应力与黏度值,在一定粒度范围内恶化锂辉石、长石的浮选效果;长石质量分数的增加提高了微细粒锂辉石矿浆流体的屈服应力与黏度值,导致锂辉石回收率下降,影响微细粒锂辉石浮选效果;通过添加六偏磷酸钠,可以增大微细粒锂辉石、长石颗粒的表面电负性,增强微细粒锂辉石、长石颗粒间的双电层静电作用斥力,降低矿浆体系的黏度与屈服应力,优化流变性能,进而改善了微细粒锂辉石与长石的浮选分离效果,达到优化调控微细粒锂辉石浮选效果的目的.     

丰宁招兵沟磷矿选矿实践

丰宁招兵沟低品位磷矿特点为中高品位磁铁矿、低品位磷矿共生.通过对磷矿的浮选研究,对选铁尾矿增加了磷矿回收,选用日用化工常规的表面活性剂AE,作为低温捕收剂的增效剂,矿浆不加温、加碱,浮选药剂制度简单,以极低品位磷资源入选而获得极高品位和高回收率磷精矿.     

细粒嵌布贫铜镍矿的特征及其对选矿的影响

为了探明广西融水某铜镍矿矿石的工艺矿物学性质,采用光谱半定量分析、化学多元素分析、物相分析等方法,对矿石的物质组成、铜镍在矿石中的赋存形式及黄铜矿、镍黄铁矿的嵌布特性等进行了系统研究.结果表明：该铜镍矿石铜的品位为0.83％,硫化铜中的铜占96.02％,主要赋存于黄铜矿中;镍的品位为0.52％,硫化镍中的镍占73.08％,主要赋存于镍黄铁矿中,但氧化镍和硅酸镍的存在会影响到镍的回收率,其中氧化镍采用常规的浮选药剂是较难回收的,而硅酸镍是不能回收的,所以实际上25.00％的镍是不能回收的.矿石的结构较复杂,矿石中的镍黄铁矿、黄铜矿的粒度以细粒为主,且镍黄铁矿、黄铜矿、磁黄铁矿、黄铁矿之间共生关系密切,多数以非自形晶结构为主,接触边界不规则,给硫化矿物之间的分离带来困难,从而影响铜镍精矿品位.     

混合用药强化浮选在某铜钴矿的应用

影响浮选的工艺因素较多,因此强化浮选过程的途径也多种多样。其中以强化药剂制度较为简单易行。 本试验是采用不同捕收剂的混合用药,作为强化浮选、提高回收率的药剂制度。两种或多种矿物的混合浮选,虽然从浮选药剂中可以找到同时回收这些矿物的捕收剂,但由于矿物之间可浮性的差异而顾此失彼,甚或两者都受到影响。混合用药可以对不同的矿物达到提高浮选效果的目的。     

高冰镍中Cu2S矿的电化学浮选研究

利用单矿物浮选试验研究了ｐＨ值及矿浆电位对高冰镍中辉铜矿（Ｃｕ２Ｓ）浮选行为的影响．利用热力学及电化学方法探讨了ＣＵ２Ｓ矿表面氧化及稳定的条件；分析研究了乙黄药与Ｃｕ２Ｓ矿的作用．     

FCMC—3000旋流微泡浮选柱计算机监控系统的研制

分析和阐述了FCMC－3000旋流微泡浮选柱监控系统的控制方法，硬件和软件系统，采用两点压力法，监测和控制浮选柱内液位，确立了加药量与入料流量的函数关系，编制的Windows3.X或Widows95/98应用软件实现了浮选柱的动态检测与控制，数据存贮与打印。     

Velocity distribution of the flow field in the cyclonic zone of cyclone-static micro-bubble flotation column

Laboratory experiments have been conducted to study the flow field in a cyclone static micro-bubble flotation column. The method of Particle Image Velocimetry (PIV) was used. The flow field velocity distribution in both cross section and longitudinal section within cyclonic zone was studied for different circulating volumes. The cross sectional vortex was also analyzed. The results show that in cross section as the circulating volume increases from 0.187 to 0.350 m³/h, the flow velocity ranges from 0 to 0.68 m/s. The flow field is mainly a non-vortex potential flow that forms a free vortex without outside energy input. In the cyclonic region the vortex deviates from the center of the flotation column because a single tangential opening introduces circulating fluid into the column. The tangential component of the velocity plays a defining role in the cross section. In the longitudinal section the velocity ranges from 0 to 0.08 m/s. The flow velocity increases as does the circulating volume. Advantageous mineral separation conditions arise from the combined effects of cyclonic flow in cross and longitudinal section.     

Process mineralogy of copper-nickel sulphide flotation by cyclonic-static micro-bubble flotation column

In our study we investigated a refractory copper-nickel sulfide ore separation by using a cyclonic-static micro-bubble flotation column (FCSMC). The process mineralogy of the main products was studied. Using a scanning electron micro-scope-energy dispersive system (SEM-EDS) and an X-ray spectrometer the mineral category and content of samples were analyzed. By using a mineral liberation analyzer (MLA) the mineral liberation characteristics were revealed. It is shown that in roughing feed the monomers liberation degree of nickel pyrite and chalcopyrite take up 84.11% and 88.82%, respectively. In tailings, the lost nickel pyrite and chalcopyrite are mainly monomers. Therefore, strengthening the micro-fine particle recovery capacity is the key to increase recovery.     

Nanobubble generation and its applications in froth flotation(part Ⅳ): mechanical cells and specially designed column flotation of coal

Coal is the world's most abundant fossil fuel.Coal froth flotation is a widely used cleaning process to separate coal from mineral impurities.Flotation of coarse coal particles,ultrafine coal particles and oxidized coal particles is well known to be difficult and complex.In this paper,the nanobubbles' effects on the flotation of the varying particle size,particle density and floatability coal samples were evaluated using a bank of pilot scale flotation cells,a laboratory scale and a pilot scale specially designed flotation column.The parameters evaluated during this study include the flow rate ratio between the nanobubble generator and the conventional size bubble generator,the superficial air velocity,collector dosage,frother concentration,flotation feed rate,feed solids concentration,feed particle size,and the superficial wash water flow rate,etc.The results show that the use of nanobubbles in a bank of mechanical cells flotation and column flotation increased the flotation recovery by 8%～27% at a given product grade.Nanobubbles increased the flotation rate constants of 600～355,355～180,180～75,and 75～0 microns size coal particles by 98.0%,98.4%,50.0% and 41.6%,respectively.The separation selectivity index was increased by up to 34%,depending on the flotation feed characteristics and the flotation conditions.     

A honeycomb-tube packing medium and its application to column flotation

We address problems in the development of large-scale flotation columns that use short cylinders. As a starting point, we investigated the packing medium to identify a highly efficient internal packing for the flotation column. The chosen packing was a honeycomb structure with an aperture diameter of 80 mm, a web thickness of 0.80 mm, a film height of 1000 mm, packed into a 400 mm diameter space, which completely filled the vessel at optimal cost. The column consisted of a modular ring of single-hole hexagonal honeycomb tube packing made from atactic polyproplene (PP-R). The packing was tested in a cyclonic, static mi-cro-bubble flotation column. Computational fluid dynamic modeling was used to analyze the flotation fluid in a honeycomb tube packed flotation column. Our results show that the fluid axial movement was maximized and that the transverse fluid velocities were zero in the vicinity of axial flow. Using the honeycomb tube packing for copper sulfide flotation we observed that the average concentration in the product was increased to 25.41%, from an average feed concentration of 0.729%, with an average recovery of 92.92%. The demands of on-site industrial production were met.     

Particle Residence Time in Column Flotation Based on Cyclonic Separation

The cyclonic static micro-bubble column flotation （FCSMC） is an effective separation device for fine particle treatment. The high mineralization rate and short flotation time of this equipment can be attributed to its unique cyclonic force field. It also has been observed that the presence of a cyclonic force field leads to a lower bottom separation size limit and a reduction of unselective entrainment. The collection zone of the column is considered to consist of two parts, a column separation zone and a cyclonic zone. Total recovery of the collection zone was developed. For our study, we analyzed the particle movement in the cyclonic zone. Particle residence time equations for the cyclonic zone were derived by force analysis. Results obtained in this study provide a theoretical foundation for the design and scale-up of the FCSMC.     

Research on Pressure Drop Performance of the Packing-Flotation Column

A packing-flotation column was proposed to optimize the flotation environment A research system was established using a 100 mm diameter cyclonic micro-bubble flotation column to study fluid properties. Dry-plate and wetplate pressure drops were studied and the corresponding pressure drop equations developed. The results show that the dry-plate pressure drop of the packing cyclonic micro-bubble flotation column is 10-15 times less than that of the chemical tower, which is principally shown in its relatively small resistance coefficient, ξ = 0.0207. The wet-plate pressure drop is 2-3 times higher than that of the chemical tower, which is largely caused by the separation materials and characteristics of the equipment. With flotation, the greater the pressure drop, the better the flotation environment.     

SFC型充填式浮选柱的研究及应用

国内外大量研究结果表明充填式浮选柱是一种可供选矿、化工、造纸和废水处理等行业用于精选细粒矿物、粉煤除灰脱硫及其它物料分离的设备,与目前所用的浮选设备相比,具有结构简单,能耗低、分选效率高、操作容易等优点。     

Nanobubble generation and its applications in froth flotation (part Ⅲ): specially designed laboratory scale column flotation of phosphate

Froth flotation is used widely for upgrading raw phosphate. The flotation recovery of coarse phosphate (-1.18+0.425 mm) is much lower than that achieved on the -0.425+0.15 mm size fraction. Enhanced recovery of coarse phosphate particles is of great economic and environmental importance for phosphate industry. In this investigation, four different phosphate samples were aquired, characterized and tested in a specially designed laboratory-scale flotation column. Significant recovery improvement of coarse phosphate flotation was achieved using cavitation-generated nanobubble though its effects differ among the four testing phosphate samples. The laboratory-scale flotation column test results indicate that nanobubble increased P2O5 recovery by up to 10%-30% for a given Acid Insoluble (A.I.) rejection, depending on the characteristic of phosphate samples. The improvement ef-fect of nanobubble on the hard-to-float particles was more significant than that on easy-to-float particles, especially at lower col-lector dosages. Nanobubbles reduced the collector dosage by 1/3 to 1/2. Nanobubbles almost doubled the coarse phosphate flotation rate constant and increased the flotation selectivity index by up to 25%.     

煤泥高效调浆理论研究与应用

基于煤粒与捕收剂充分接触和有效黏附是实现煤泥调浆前提条件的认识,应用Sommer-feld颗粒间碰撞模型,导出了调浆过程中颗粒分散后的碰撞概率,并用颗粒绕流效应对碰撞概率进行了修正,考察了高剪切条件下实际流场中油滴与煤泥颗粒碰撞的规律.提出了捕收剂与煤泥颗粒有效吸附概率的概念,讨论了煤泥高效调浆的技术途径,并进行了调浆试验.结果表明:提高调浆剪切强度,保证调浆时间是确保浮选精煤回收率和质量的关键,过度调浆不利于提高浮选精煤回收率.