疏水选择性絮凝分离微细粒菱锰矿的机理探讨

对选择性疏水絮凝浮选法分离微细粒菱锰矿、绿泥石、石英过程的机理进行了探讨，主要研究内容包括：捕收剂选择性地在菱锰矿微粒表面吸附，使之疏水化；表面吸附捕收剂而疏水化的菱锰矿微粒在搅拌下疏水絮凝；疏水絮团与气泡粘附实现浮选分离。     

微细粒菱锰矿的选择性絮凝—浮选研究

采用选择性絮凝-浮选工艺,对微细粒菱锰矿-石英人工混合矿进行分离的试验研究,获得了良好的选矿指标。与常规浮选相比,锰精矿品位提高5％,回收率提高45％左右。     

煤泥选择性絮凝浮选中聚丙烯酰胺的作用机制

测试了阴离子型低相对分子质量聚丙烯酰胺PAM A401作用对煤及高岭石絮体表观粒径分布、样品红外光谱以及表面润湿性的影响,并通过浮选速度实验验证PAM A401的作用效果.研究表明,12 mg·L-1PAM A401且循环搅拌11 min时,煤絮体累积粒度分布达到10%、50%和90%时对应的粒径分别是高岭石絮体的6.86、2.22和2.45倍,呈较好的絮凝选择性.吸附PAM A401后,煤的亲水性官能团特征峰增强,疏水性降低;高岭石的亲、疏水性官能团均有增加,疏水性略高.与常规浮选相比,选择性絮凝浮选实验的浮选速率较大,捕收剂用量降低30%.浮选3 min时,选择性絮凝浮选实验的可燃体回收率为81.57%,较常规浮选实验高3.64%,精煤灰分相当.PAM A401虽使煤颗粒的表面润湿性降低,但微细粒煤颗粒表观粒径增大的效应促进微细粒煤泥的分选.      

某微细粒难选铁矿选矿试验研究

某铁矿为微细粒弱磁性铁矿,有用矿物主要是赤铁矿和磁铁矿,脉石矿物主要是石英．在磨矿中产生许多矿泥,影响其可浮性．采用重选、磁选、浮选、选择性絮凝和磁化焙烧等工艺处理该矿石．结果表明,采用选择性絮凝脱除矿泥,阳离子反浮选工艺最合适．在原矿含铁45．27％的情况下,获得铁品位59．67％,回收率78．84％的铁精矿．     

药剂在微细粒菱锰矿絮凝—浮选中作用的研究

运用现代仪器测试技术,对微细粒菱锰矿选择性絮凝—浮选中分散剂、絮凝剂、捕收剂的作用进行了详细的研究。     

论复合抑制剂在优先浮选菱锰矿碳酸盐矿石中的作用

采用复合抑制剂取代传统药剂水玻璃，可以改善菱锰矿浮选效果。在用油酸钠优先浮选菱锰矿碳酸盐矿石的选矿中，复合抑制剂的作用主要表现为：ａ．调整捕收剂溶液的泡沫结构；ｂ．改善捕收剂附着矿粒的选择性；ｃ．防止了细粒存在时所得到的过稳定泡沫“跑槽”。     

盐化水玻璃在微细粒菱锰矿与伊利石等脉石矿物分离中的作用

当采用脂肪酸类捕收剂对微粒菱锰矿实现选择性疏水团聚浮选时,盐化水玻璃对伊利石等粘土类矿物细泥产生强化抑制作用。用红外光谱进行了检测,并研讨了盐化水玻璃在微细粒菱锰矿与伊利石等脉石矿物分离中的作用机理。     

微细粒铜镍硫化矿浮选的疏水絮凝机制研究

应用胶体DLVO理论来理论分析某微细粒铜镍硫化矿絮凝浮选的内在絮凝机制,并借助于纯矿物（镍黄铁矿）浮选试验水中显微镜观测结果加以说明和验证。分析了影响疏水絮凝的主要因素有：颗粒粒径、矿物浓度、组合捕收剂的种类和用量、分散剂和选择性抑制剂的种类和用量等。并通过纯矿物试验与矿石试验,从理论上和实践上加以分析和研究,找出用常规的疏水絮凝方法进行浮选难以有效除去精矿中蛇纹石脉石的主要原因。     

微粒菱锰矿和绿泥石悬浮体的控制分散及聚团的研究

对微粒菱锰矿和绿泥石悬浮体的控制分散行为进行了研究,发现水玻璃是选择性疏水聚团菱锰矿的一种良好的控制分散剂。通过红外光谱分析,发现水玻璃的控制分散作用在于抑制了羟肟酸钠的吸附。对高聚物与捕收剂联合作用产生的聚团进行了研究,并在此基础上建立了高聚物与捕收剂联合作用聚团的微观机理模型,这个模型被试验所证实。     

白钨矿现代浮选研究概况

白钨矿现代浮选研究的成果,主要有石灰法、组合抑制剂法、新型抑制剂法,使用新型捕收剂、剪切絮凝法和热水浮选法等,这些研究从不同方面或不同程度地克服了彼德罗夫法和酸浸法的缺陷,使白钨矿浮选步入新的台阶。     

Flotation of Iron Oxides and Quartz—A Review

Froth flotation of iron oxides and quartz is reviewed over the broad range of particle sizes. The review, which embraces laboratory-, pilot plant- and industrial operations, encompasses (i) surface chemistry of iron oxides and quartz flotation (ii) relevant collectors and their adsorption mechanism and (iii) activation/depression in selective flotation, in this system. The diverse effect of temperature on iron oxides and calcium-activated quartz flotation is also indicated; the flocculation-flotation process of upgrading fine-grained iron ores is highlighted; and the economic advantage of reverse flotation in high grade, coarse- or medium grained iron ore flotation circuits is noted.     

Processing of Alumina-Rich Iron Ore Slimes: Is the Selective Dispersion–Flocculation–Flotation the Solution We Are Looking for the Challenging Problem Facing the Indian Iron and Steel Industry?

Beneficiation of alumina rich iron ore slimes is a major challenge for the Indian iron ore industry. Considering the limits of gravity and magnetic separation processes in the relatively finer size range in terms of achieving adequate separation efficiency, selective flotation (with and without selective flocculation) of iron ore slimes, which is being used commercially in several countries for the beneficiation of iron ores, is worth exploring for the beneficiation of Indian iron ores. Based on the extensive work carried out in our laboratories, we have concluded that the design and development of highly selective reagents to achieve satisfactory separation of hematite and goethite from alumina containing minerals (gibbsite or kaolinite) in the ore and ore slimes, is the key to solving the challenging problem of processing alumina rich iron ores. Accordingly our research work has been focused on finding/designing selective reagents for iron oxide–gibbsite–kaolinite separation based on a molecular modeling computational approach developed by us for the design of mineral processing reagents. We present in this paper the results of our density functional theory computations to evaluate the interaction energies of a wide variety of different reagent functional groups such as carboxylic acid, hydroxamic acid, phosphonic acid, iminobismethyl phosphoric acid, xanthate and starch with hematite, gibbsite and kaolinite surfaces. Among all the reagents investigated so far, starch exhibits the highest selectivity towards the hematite surface with a difference in interaction energy of ~63 kcal/mol between hematite and gibbsite surfaces. Based on our earlier work which indicated polyvinyl pyrrolidone (PVP) to be more selective dispersant for kaolinite compared to conventional sodium silicate and sodium hexametaphosphate, we have investigated selective flocculation–dispersion of natural iron ore slimes (three different samples obtained from three different mines in India) with PVP and starch reagent combination. The results are promising. While the work is still in progress, the implications of our recent results are discussed in the context of the challenging problem of processing of alumina rich iron ore slimes in India.     

Parametric aspect of Hydrophobic flocculation technology

Hydrophobic flocculation separation technology has been considered as an effective and potential means to treat finely disseminated ores and to recover valuable minerals from slimes. This paper highlights the parametric aspect of hydrophobic flocculation of mineral fines in aqueous suspensions, as well as some of the applications of this technology to fine mineral beneficiation. The main parameters, namely dispersion, particle hydrophobicity, kinetic energy input, nonpolar oil, hydrophobic coarse particles, external magnetic field, and ferromagnetic particles, etc., are discussed and summarized. Some of the experimental results on the effects of the parameters on hydrophobic flocculation of mineral fines are presented.     

钨矿细泥选矿工艺发展

随着对钨细泥特点的不断研究,浮选、重选、磁选、浸出等单一工艺不能满足对钨细泥选别指标的要求,多种选别方法结合的联合工艺应运而生.文中简述了各种流程的特点以及针对钨细泥选别在选厂调研中发现的问题,对未来钨细泥的研究方向以及设备应用进行展望.      

高铝型褐铁矿直接还原工艺相变研究

为了研究某高铝型褐铁矿直接还原过程中的物相变化规律,采用偏光显微镜、扫描电镜(SEM)、X射线衍射仪(XRD)和矿物自动解理系统(MLA)对某高铝型褐铁矿进行矿物组分分析,然后对其矿物水分进行定性测定。结果表明,该高铝型褐铁矿主要由针铁矿、赤铁矿、铬铁矿、石英和绿泥石等矿物组成,原矿微观形貌是以疏松状针铁矿为主,其内部嵌布有粒径不同的铬铁矿、赤铁矿和硅酸盐等矿物,导致其部分客晶矿物难以通过物理分选去除,Cr、Ni和Co等有益元素主要是以针铁矿、铬铁矿等为赋存载体;结晶水的研究结果表明,在升温过程中针铁矿和绿泥石分别在290 ℃和830 ℃先后失去结晶水或者羟基,导致物相转变为赤铁矿和橄榄石相。     

Mechanism of the interaction of slimes of alumina production with carbonate solutions

In the course of laboratory investigations, it is established that slimes of desiliconization of alumina production possess selective properties with respect to alkali metals during interaction with carbonate solutions. By the magnitude of sorption by slimes, cations of alkali metals are arranged in the series Li > K > Rb > Cs. In general, selectivity of slimes is determined both by the ion-exchange properties and by the formation of binary and ternary carbonates of alkali metals and calcium.     

容量法测定阳极泥中金

本文提出了用氢醌容量法测定阳极泥中的金，研究了如何从阳极泥中分离与富集金的方法，本法的精密度与准确度均好，具有流程短，分析速度快，成本低等优点。     

Investigating the use of an ionic liquid for rare earth mineral flotation

Common collectors for rare earth mineral(REM) flotation,which include carboxylates and hydroxamates,face problems such as being non-selective and sensitive to impurity ions.A type of ionic liquid(IL),tetraethylammonium mono-(2-ethylhexyl)2-ethylhexyl phosphonate([N_(222)][EHEHP]),has been investigated previously for rare earth elements(REE) solvent extraction,and was proven to be selective and effective.In this work,[N_(222)][EHEHP] was evaluated as a collector in bastnasite(a primary REM source for REE production) flotation for the first time.The results were compared with quartz and hematite,two common gangue minerals in REM deposits.Zeta potential measurements and Fouriertransform infrared spectroscopy(FT-IR) were completed to investigate the surface chemical properties involved in the flotation of these minerals using this collector.The findings were compared with microflotation results.FT-IR and zeta potential measurements suggest adsorption of the collector's phosphonate group onto bastn(a|")site and hematite,likely through chemisorption;whereas for quartz,the minimum micro flotation recovery is likely due to no adsorption of IL on its surface.Micro flotation re sults show higher collectability of [N2222] [EHEHP] for hematite than bastnasite,the latter only shows appreciable recovery at pH 5 with elevated dosage of IL(500 g/t).To achieve better separation,a two-stage flotation scheme was designed and evaluated by bench scale flotation on a synthetic mineral mixture.The concentrates and tails were analyzed by magnetic separation,and it is found that bastnasite recovery over 90% with maximum upgrade ratio 1.7 can be achieved with elevated collector dosage.     

贵州某金矿石选矿试验研究

贵州金矿载金矿物与脉石矿物呈微细粒嵌布，浮选前必须细磨，势必产生大量次生矿泥，加之原矿有部分易于泥化的粘土矿物，给选别造成恶劣影响。采取强化分散矿泥，强化浮选过程，经过一粗、二精、三扫的工艺流程，取得较好的分选指标。