白钨矿浮选药剂的研究进展

浮选是当前白钨矿选别的主要手段之一。文章结合选矿实践及有关白钨矿浮选技术,介绍了白钨矿的基本性质及其浮选药剂的应用现状和发展情况,结合文献报道,分析了有关药剂在反应过程中的作用机理。指出目前白钨矿浮选难点主要在于使目的矿物与含钙盐类矿物有效分离,以及捕收剂选择性的提高等方面。针对白钨矿加温浮选技术存在能耗高等问题,认为常温浮选法及其药剂的开发是今后研究的重点,提出加大对有关药剂作用机理的研究,以及寻求在新药剂、组合药剂的开发与应用上的突破,是白钨矿浮选药剂的发展方向。     

白钨矿浮选研究进展

概述了白钨矿的资源现状,白钨矿与含钙脉石矿物的可浮性差异,介绍了白钨矿浮选药剂与浮选设备的研究进展,为白钨矿高效回收利用提供一定的参考。     

白钨矿选矿工艺研究现状及发展趋势

简述了白钨矿资源开发与利用现状,从白钨矿选矿方法、药剂和设备三个方面,介绍了白钨矿选矿工艺研究现状和发展趋势。重点探讨了联合工艺流程、组合药剂及新型浮选设备,在白钨矿选别中的应用价值。采用合理的联合工艺流程,不仅能提高白钨精矿的品位和回收率,还可以高效回收白钨矿中共伴生的各类有价金属,提高经济效益。新型组合药剂,对目的矿物的选择性和捕收性都大大增强,是未来浮选药剂开发的一个重要方向。新型细粒浮选设备的出现,尤其是针对白钨矿这种脆性矿物,极大地提高了微细粒白钨矿的回收率,避免了资源浪费。     

白钨矿浮选药剂研究现状及展望

提高捕收剂的选择性和强化抑制剂的高效性始终是白钨矿浮选研究中的重点.从白钨矿的捕收剂和调整剂的种类、作用机理及研究使用现状等方面进行了分析,提出高选择性捕收剂和针对性强的抑制性是白钨矿浮选急需解决的问题.运用高新技术,结合理论研究,开发高效、经济、环保的浮选药剂已成为白钨浮选药剂的发展趋势.     

白钨矿浮选工艺及药剂现状

文章在收集大量的资料的基础上,主要介绍了白钨矿浮选工艺及其浮选过程中的捕收剂和抑制剂的现状以及作用原理,同时展望了白钨矿浮选药剂的发展方向.     

某钼铋浮选尾矿综合回收白钨矿实验研究

某低品位钨钼铋多金属矿具有贫、细、杂等难选的特点,现场白钨矿生产指标低,对现场钼铋浮选尾矿研发了"硫化矿浮选-钨常温粗选-钨粗精矿加温精选"新工艺。浮硫尾矿采用组合调整剂、高效白钨矿捕收剂ZL和钨粗精矿加温精选新药剂制度,解决了低品位白钨矿浮选回收技术难题。对含WO30.21%的实验给矿,获得钨精矿WO3品位由工业生产的40%提高至61.94%、对给矿WO3回收率由工业生产的15%提高至78.40%,白钨矿得到有效的综合回收。     

某低品位难选白钨矿常温浮选试验研究

江西某白钨矿石含钨0.23%,原矿钨品位低、嵌布粒度较细、萤石含量高,是典型的白钨-方解石-萤石（或重晶石）型难选白钨矿.针对该难选白钨矿中有价金属钨无法有效回收的现状,对其进行了试验研究,结果表明,采用组合药剂（GYW＋731）做捕收剂,新型药剂WH做活化剂,实现了该低品位难选白钨矿的常温浮选,闭路试验获得了品位为35.11%,回收率为72.20%的钨精矿.     

白钨常温浮选工艺研究

用常温浮选分别对两种不同类型的白钨矿石进行工艺方案的试验比较,考查研究了常温下白钨浮选工艺的适应性,推荐一种组合药剂作白钨精选的抑制剂,并获得了良好的选别指标。     

碳酸钠对白钨矿自载体浮选的影响及机理

-10 μm白钨矿的浮选回收率低, 导致大量白钨矿损失于尾矿中, 造成资源浪费, 而载体浮选是提高-10 μm白钨矿回收率的有效方法之一.根据粒级以及粒级组成对白钨矿浮选的影响, 通过浮选试验、理论计算和仪器检测等方法研究了-10 μm细粒级白钨矿的自载体浮选, 同时研究了载体比例、载体含量和碳酸钠对白钨矿自载体浮选的影响.研究结果表明, 油酸钠为捕收剂时, 在合适的载体粒度和载体比例下, 自载体浮选是提高-10 μm白钨矿回收率的有效方法, 碳酸钠可强化白钨矿的自载体浮选, 扩大载体比例和载体粒度范围.机理研究表明, 白钨矿      

新型小分子抑制剂在白钨矿浮选中的应用研究

脂肪酸和水玻璃是白钨矿浮选中的经典浮选药剂,在国内外大型白钨矿矿山中广泛应用。水玻璃可以有效抑制硅酸盐、方解石等典型脉石矿物,但是用量极大（6～10 kg/t）,不仅会抑制部分白钨矿矿物上浮,也会导致一系列废水净化和回水利用难题。本研究针对这一难题,设计开发新型小分子抑制剂CS,取代大部分水玻璃,并以湖南某白钨矿为研究对象开展选矿试验研究。结果表明：新型小分子抑制剂具有良好的选择抑制能力,可高效吸附于方解石表面;常温浮选作业中,CS可替代自身用量4～5倍的水玻璃,同时可提高白钨浮选回收率4个百分点以上。新型小分子抑制剂CS为解决经典钨矿浮选工艺中高水玻璃用量难题提供了新的解决方案。     

浮选过程泡沫图像特征识别研究

在浮选过程中,通过观测矿浆泡沫状态来判断药剂添加量的程度。运用图像检测方法,提取矿浆中泡沫图像特征,获取浮选过程加药量的程度,实现加药量进行调节,浮选过程加药量的自动控制提供条件。     

Use of IgM monoclonal reagents licensed for tube tests in column agglutination technology

BACKGROUND: Red cell (RBC) phenotyping using column agglutination technology (CAT) is currently limited by the reagents formulated in the system. To overcome this limitation, it was investigated whether monoclonal IgM reagents licensed for use with tube tests produced valid results with CAT. STUDY DESIGN AND METHODS: Commercial CAT, does not contain antisera, was used to evaluate Procedures A (40 microL of reagent and 10 microL of 4% RBCs) and B (50 microL of reagent and 50 microL of 0.8% RBCs) with or without incubation at room temperature. In Study 1, reagents were tested to determine whether potentiators inhibit the passage of antigen-negative RBCs through the column. In Study 2, CAT sensitivity was measured by the use of potency titrations to define a procedure for each reagent that matched or exceeded that of the tube method. In Study 3, the specificity of each reagent was determined in parallel with the CAT and tube tests. Typing of 1644 samples was performed. RESULTS: Study 1: Free passage was obtained with all reagents. Study 2: Immediate-spin methods using CAT produced the same results as the tube method. Study 3: With 8048 comparisons made, discrepant results were found in 32 transfused patients and in 6 cord blood samples, mainly with Lewis reagents. With comparison of CAT and the standard tube method, complete agreement was obtained with Kell reagents, 99.9-percent agreement with Kidd reagents, and 98.9-percent and 99.4-percent agreement with Lewis reagents. CONCLUSION: Most examined reagents seem suitable for use with CAT.     

Anomalous origin of the left coronary artery from the anterior aortic sinus: role of echocardiography

Vancomycin-resistant enterococci recently isolated from patient specimens were tested with both Streptex and PathoDx group D latex agglutination antisera. Using routine protocols, all isolates from patients at Temple University Hospital were positive with the PathoDx reagents and were negative with the Streptex reagents. Isolates required extensive boiling for positive reactions to occur using Streptex reagents.     

酸性介质中萃取铟的研究

综述了在不同的酸性介质中，用不同的萃取剂萃取铟的研究。指出在硫酸介质中，萃取铟常用的萃取剂是酸性磷型萃取剂，如P204、P538、P5708、D2EHMTPA等；在盐酸介质中常用的萃取剂有胺类萃取剂、亚砜类萃取剂、中性氧磷萃取剂，如：N235、TOPO、石油亚砜等，并指出在萃取铟的过程中，影响萃取率的因素主要有：酸度、萃取剂浓度、水相中铟离子的浓度、VA：VO、萃取级数等。     

Heterogeneity of bovine IgG2. VI. Comparative specificity of monoclonal and polyclonal capture antibodies for IgG2a (A1) and IgG2a (A2)

The relative specificity of 26 randomly selected polyclonal and monoclonal anti-bovine IgG2 reagents for the A1 and A2 allotypic variants of IgG2a was evaluated in a direct RIA using the reagents as solid-phase capture antibodies (CAbs). More than 70% of these reagents were significantly allotype-biased and > 80% of those were positively biased to IgG2a (A1). Compared as the ratio of the ng of IgG2a (A1) bound versus ng IgG2a (A2) bound per 50 ng added (Krel), bias for IgG2a (A1) of six of these reagents was greater than two-fold. Compared in terms of their solid-phase equilibrium constants (Keq), differences as great as two-logs among these reagents were observed. Steward-Petty plots suggested that differences in Krel of a select panel of reagents was usually due to differences in Keq, but for two reagents with large differences in Krel, the existence of one population of CAbs recognizing an allotope and another recognizing common IgG2a determinants, was indicated. Eight of ten guinea pigs immunized with IgG2a (A1) responded with highly significant specificity bias for A1 whereas only two of 11 rabbits and two of ten guinea pigs immunized with IgG2a (A2) responded weakly with preference for IgG2a (A2). These results concur with the concept of the immunodominant nature of the A1 allotope, but also suggest that immunization with IgG2a (A2) might be a practical means of avoiding allotype bias in IgG2a reagents. The data indicate that the majority of randomly selected anti-bovine IgG2 reagents are allotype biased to the extent that when used as serological reagents to measure total IgG2 or bovine IgG2 antibody responses, the allotype of the animal tested rather than its total IgG2a concentration or IgG2 antibody titer, can determine the outcome of the serological test.     

建立进厂水处理药剂管理制度,控制用药质量

为有效地控制冶金企业大量消耗使用的水处理药剂的质量,宣钢动力厂建立了进厂药剂管理制度,首次在宣钢实现了对水处理药剂的质量评定,取得了较好的效果。     

Recent developments and advances in formulations and applications of chemical reagents used in froth flotation

Over the last two decades, significant advances have been made in the field of chemical reagents used in froth flotation, a solids separation technique whose success depends on the use of a wide variety of both inorganic and organic reagents, including polymers, for controlling the wetting behavior of solid surfaces, particle dispersion or aggregation, and bubble stability. Novel discoveries include new chemistries of reagents, especially collectors, depressants and frothers, new blends of known chemical compounds, new applications of known reagents, and the development of scientific methodologies for reagents design and testing of potential formulations. Even though the most important application of froth flotation has been the processing of raw materials, in recent years new applications of flotation continue to grow. Depletion of easy-to-process, high-grade ores and an increasing demand for clean technologies require new flotation reagents, that are environmentally friendly, more versatile, and economic. This article reviews recent developments of new chemistries for froth flotation, some of which are now available as commercial products, and their applications.     

Development of investigation techniques of froth flotation from the beginning of its wide industrial use. Part two. Methods of evaluation of the adsorption and orientation of heteropolar molecules of reagents in the adsorption layer on the surface of particles

Methods for evaluation of the adsorption and orientation of heteropolar molecules of reagents in the adsorption layer on the surface of particles and the adsorption of reagents on the surface of bubbles are considered. Experiments of nonfrothing flotation from a turbulent medium, methods of froth flotation (FF) with a limited air consumption, measurement of detachment forces simulating the FF, determination of the adherence times of the particles to the bubbles, and measurement of the contact angles can be used to reveal the character of the orientation of adsorbed molecules or ions of reagents. To evaluate the adsorption of reagents on the surface of bubbles, only static procedures for determination of the surface tension (σ), methods of recording the relaxation curves σ(t), and methods for evaluation of froth formation and destruction can be used. This possibility is reviewed to establish the relation between the definite properties of reagents and their concrete effect under the dynamic FF.     

Progress of Flotation Reagents of Rare Earth Minerals in China

The development and application of several flotation reagents of rare earth minerals in China since 1960s and their performance were described. Furthermore, the development trends of flotation reagents of rare earth minetttla were discussed.     

黑白钨共生矿混合浮选药剂及工艺

概述了黑白钨混合浮选药剂,介绍了黑白钨混合浮选药剂机理,并简述了黑白钨混合浮选工艺。