JKSimFloat模拟闭路循环浮选回路

在实验室分批浮选试验的基础上建立了浮选回收率模型,通过回归分析获得了某磷铁矿石浮选动力学参数。应用JKSimFloat软件建立了一个闭路循环浮选回路,将获得的参数输入到软件中,并对其它设备参数进行了合理的优化设置后,模拟计算了该浮选回路的选别效果。与实验室闭路浮选试验结果相比,模拟的精矿品位基本相当,而模拟的精矿回收率偏低。     

解离对于提高难浮煤泥可浮性的研究

以庞庞塔矿选煤厂难浮煤泥为研究对象,通过小浮沉试验和分步释放浮选试验,得出其可浮性差的原因是中间密度物含量较高。该煤泥不同程度解离后的浮选试验结果表明,在磨煤时间为7 min(平均粒度11.75μm)时,可取得最佳浮选效果,精煤产率达到74.37%,比未经磨煤时提高了6.05个百分点;灰分为9.52%,比未经磨煤时降低了6.08个百分点。     

矿物晶体结构与表面特性和可浮性关系的研究

本文综述了近年来国内外在矿物晶体结构与矿物表面特性和可浮性之间关系的研究现状，着重评述了矿物晶体结构与表面特性、晶体结构与可浮性、晶格缺陷与可浮性及晶体结构与矿物解理、断裂关系的研究成果，最后对该工作的更深一步研究进行了展望。     

电解铝废阴极炭的可浮性研究

工业铝电解产生的废阴极主要由石墨化炭和电解质构成,废阴极中的石墨化碳可通过浮选工艺进行综合回收。本文在以柴油为捕收剂、松醇油为起泡剂的浮选体系中,对去离子水清洗前后废阴极炭的可浮性做了对比研究。同时研究了pH值、Na 、K 、Ca2 、Al3 等金属离子对废阴极炭可浮性的影响。试验结果表明,溶解于浮选矿浆中的电解质氟化钠所释放出的金属离子Na 是影响废阴极炭可浮性的主要因素。浮选体系中的金属离子对废阴极炭可浮性影响较大,金属离子价数越高、离子浓度越大废阴极炭可浮性越好。矿浆pH值对废阴极炭可浮性影响不大。     

孔雀石固—液界面性质及其可浮性研究

本文研究了孔雀石固-液界面的可溶性、电泳活性、可浮性等基本性质及其相互关系。并对目前被广泛采用的硫化浮选法中的一些问题进行了浅析。     

辰砂可浮性的研究

系统地研究了辰砂在黄原酸体系中的可浮性和常见重金属离子对其可浮性的影响。结果表明,黄药易捕收辰砂,硫酸铜和硝酸铅对辰砂稍有活化作用,三价和二价铁盐对辰砂有抑制作用,硫酸锌对它的可浮性影响较小。通过红外光谱、X—光电子能谱、原子吸收光谱和ζ—电位测定等方法研究了辰砂表面电性、辰砂与硫酸铜和黄药及活化的辰砂与黄药的作用机理。     

电解铝废阴极中石墨化碳的可浮性研究

工业铝电解产生的废阴极主要由石墨化碳和电解质构成,废阴极中的石墨化碳可通过浮选工艺进行综合回收。本文在以柴油为捕收剂、松醇油为起泡剂的浮选体系中,对去离子水浸洗前后废阴极中石墨化碳的可浮性做了对比研究。同时研究了pH值、Na~+、K~+、Ca~(2+)、Al~(3+)等金属离子对废阴极中石墨化碳可浮性的影响。试验结果表明,溶解于浮选矿浆中的电解质氟化钠所释放出的金属离子Na~+是影响废阴极中石墨化碳可浮性的主要因素。浮选体系中的金属离子对废阴极中石墨化碳可浮性影响较大,金属离子价数越高、离子浓度越大废阴极中石墨化碳可浮性越好。矿浆pH值对废阴极中石墨化碳可浮性影响不大。     

硅酸盐矿物可浮性研究及晶体化学分析

在不添加抑制剂和活化剂的条件下，在油酸钠和十二胺体系中，研究了代表五类结构的九种硅酸盐矿物的可泛性，从矿物晶体化学角度分析了矿物晶体结构与其可浮性之间的内在联系。研究表明，硅酸盐矿物的浮选特性与不同结构矿物解离后表面电性、离子组成、化学键种类等因素有关。     

重晶石基本可浮性的研究

用油酸钠和氧化石蜡皂为捕收剂，分别浮选重晶石时，它的可浮性具有相似的规律，但对介质的条件（ｐＨ值、ｐＨ调整剂类别），氧化石蜡皂比油酸钠有更好的适应性。水玻璃对重晶石有抑制作用，腐植酸亦表现出一定的抑制作用。水的硬度对重晶石的浮选有很大影响。在实际矿石浮选中，证明上述各点确有指导意义。     

A new method for flotation rate characterization using top-of-froth grades and the froth discharge velocity

A new methodology is proposed for flotation characterization in industrial operations. The approach considers the mineral recovery to be proportional to both the top-of-froth (TOF) grade and the froth discharge velocity down a bank of cells. The procedure allows for the identification of the fractional recovery profile from the discharge velocities and the TOF grades. In addition, if the total recovery of the bank is available, the cell recoveries can be estimated by scaling the fractional recoveries. For this purpose, a single parameter was used to scale the recoveries for each sampling survey in order to obtain the kinetic response along the flotation banks. Industrial tests were performed in two rougher banks; one bank consisted of six 250 m³ self-aerated cells in a 1-1-1-1-1-1 arrangement, and the other bank consisted of nine 130 m³ self-aerated cells in a 1-2-2-2-2 arrangement. The results showed good agreement with the recovery profiles obtained from the cell-by-cell mass balances along two industrial flotation banks.     

A novel approach to measure froth rheology in flotation

The current study involves a novel approach to measure froth rheology in-situ using vane. The results showed that the horizontal flow of froth towards the flotation launder interferes with the rheology measurement. A tube encircling the vane was used to minimize the effects of the horizontal flow. In order to convert the rheology raw data to rheograms, shear stress is only a function of the vane geometry and the torque values. However, it was shown that calculation of the shear rate from the vane speed depends on whether froth is fully or partially sheared.The froth characterised in this study exhibited a pseudo-plastic nature with a minor yield stress using Casson model. Therefore, froth viscosity which potentially affects froth transportation is not constant throughout the whole froth phase and it depends on the local shear rate. The suitability of the vane system to measure rheology of fluids with low shear stress was examined using a Newtonian silicone oil. It was found that the vane head should not be run in speeds above a certain range which needs to be determined. Measurements above such a speed range may not be accurate.     

A novel surfactant 2-amino-6-decanamidohexanoic acid: Flotation performance and adsorption mechanism to diaspore

In this paper, a novel surfactant, 2-amino-6-decanamidohexanoic acid (AHA-10) was synthesized and used as a collector for flotation separation of diaspore and aluminosilicate minerals. The adsorption mechanism of AHA-10 onto diaspore was also evaluated by FTIR spectra, zeta potential, XPS and solution chemistry. The flotation results demonstrated that AHA-10 exhibited superior collecting power to diaspore and good selectivity against kaolinite and illite, and could effectively recover diaspore from bauxite ores contained aluminosilicate minerals at pH around 10. The analyses of FTIR spectra, zeta potential and solution chemistry inferred that at pH around 10, AHA-10 might chemisorb on diaspore surfaces by formation of AlO and AlN bonds. AHA-10’s unique properties, such as characteristic bond model to Al atoms on diaspore surfaces, double hydrophobic groups and intermolecular hydrogen bonds between neighboring AHA-10 molecules coated on diaspore surfaces, rendering a weakening surface energy and enhancing hydrophobicity of diaspore particles.     

A novel approach to evaluating breakage parameters and modelling batch grinding

In this work, an alternative to kinetic models of batch grinding has been proposed. It recognizes the self-similar breakage patterns commonly observed in batch grinding and drop weight tests and the proposed model is essentially an extension of a method used to describe drop weight test data to batch grinding. The evaluation of model parameters for the proposed method is far more convenient and reliable than that for kinetic models.     

新型捕收剂DJW-II反浮选齐大山选矿厂混合磁选铁精矿

齐大山选矿厂采用阴离子型捕收剂LKY反浮选提纯混合磁选铁精矿,获得的精矿铁品位为67.77%、回收率为78.86%,使用LKY矿浆需要加温不仅增加了选矿能耗和工艺的复杂性,而且会降低流程的稳定性。为解决这些问题,相关课题组以新研制的脱硅捕收剂DJW-II对现场混合磁选铁精矿试样进行了室温（21 ℃）浮选试验,并对闭路试验精矿和尾矿进行了XRD和SEM分析。结果表明：-0.037 mm粒级产率为68.21%,主要矿物为磁铁矿和石英,铁在微细粒级有明显富集的试样,在pH调整剂NaOH用量为500 g/t（pH=9.0）,抑制剂羧甲基淀粉用量为150 g/t,捕收剂DJW-II用量为175 g/t情况下,采用1粗1精3扫流程处理试样,获得了铁品位为67.60%、铁回收率为86.05%的铁精矿,试验精矿指标较现场精矿指标明显优越。因此,齐大山铁矿选矿厂混合磁选铁精矿反浮选除杂以DJW-II为捕收剂,既有利于降低生产工艺的复杂性,又有利于降低生产能耗、改善生产指标、提高经济效益。XRD图谱分析证明了DJW-II在铁精矿反浮选脱硅中的高效性;SEM图片显示,试样中的微细颗粒主要是铁矿物颗粒。     

Pyrochlore surface oxidation in relation to matrix Fe composition: A study by X-ray photoelectron spectroscopy

The flotation recovery of pyrochlore from the Saint-Honore Carbonatite ore has been related to the variability in the mineral matrix Fe content; high Fe pyrochlore grains consistently report to the tails. Previous research has tentatively suggested that surface oxidation of high Fe pyrochlore grains may be driving partitioning of the pyrochlore grains to the tails. X-ray photoelectron spectroscopy (XPS) was used to examine the relationship between matrix Fe content and surface oxidation in high Fe pyrochlore grains and high Fe zoned regions in pyrochlore grains from the Carbonatite ore. XPS analyses of pyrochlore grains showed that a greater proportion of surface oxidation species corresponded to the zones with high matrix Fe content. The XPS data along with previously presented Time of Flight Secondary Ion Mass Spectrometry (TOF-SIMS) data demonstrates a relationship between matrix Fe content and collector attachment. The Fe rich pyrochlore grains or zones show a higher degree of oxidation relative to the Fe poor grains or zones. The data reveal that collector attachment favors low Fe grains or zones, likely in response to a lower degree of surface oxidation.     

A novel approach to the geometallurgical modelling of the Collahuasi grinding circuit

Compañía Minera Doña Inés de Collahuasi SCM initiated the development of a new geometallurgical model to characterize its Rosario deposit in terms of its comminution circuit capacity and flotation performance. The comminution component of the model is now complete and is described in detail in this article.The model uses a combination of simulation and power-based approaches to relate ore hardness and flotation feed size to grinding circuit throughput. Ore hardness values are provided by Collahuasi’s block model which has been populated with ore characterisation data derived from Bond ball work index tests, JK drop-weight tests and SMC Tests^® on diamond drill cores. The influences of planned and unplanned maintenance downtime are taken into account both in terms of frequency and duration.The accuracy of the model is demonstrated using weekly production data taken from the period January–December 2008, showing an average relative error of 5.2% and an R² value of 0.95.The model is now in successful routine use at the mine for planning purposes and is currently in the process of being further developed to incorporate the response of the flotation circuit.     

巷道断面优化新方法

文章首先用数学方法分析了通风巷道从开始掘进到通风期满所需要的各类费用和巷道断面的关系,然后以刘东煤矿为例,创造性的从经济合理和风压平衡的角度来优化巷道断面。按该方法来确定的巷道断面,不仅提高矿井的经济效益,还简化了通风系统优化的工作,现场应用效果非常好。该方法也为类似矿井通风系统的优化工作提供了一定的参考价值。