提高白云鄂博矿萤石精矿品位的研究

白云鄂博矿萤石精矿主要杂质为细粒级嵌布的铁矿物、稀土和部分单体重晶石,现有药剂制度下品位很难提高.通过新药剂硫酸化水玻璃、硫酸铝、栲胶、环烷酸的合理组合,采用一粗五精闭路选别流程,可有效抑制重晶石矿物,将萤石精矿品位由80％提高到95.72％,达到酸级萤石指标.     

白云鄂博氧化矿选矿工艺优化试验研究与应用

在白云鄂博氧化矿石工艺矿物学特征分析基础上,结合白云鄂博氧化矿选矿工艺流程中中磁-强磁选工艺现状,通过中磁给矿与强磁精矿性质分析和强磁精矿反浮选试验研究,提出了优化中磁-强磁选工艺的方案与建议,经实验室试验研究,有效地提高了浮选给矿品位及最终浮选精矿品位。     

白云鄂博高品位混合稀土精矿特性分析

随着稀土选矿技术的日趋进步,白云鄂博稀土精矿的品位提升至65％以上,且可进行大规模的生产应用.以白云鄂博高品位混合型稀土精矿为研究对象,采用XRD、EDS、SEM、AMICS等表征手段对高品位稀土精矿进行系统研究.研究结果表明,高品位精矿中REO品位为67.96％,轻稀土元素占稀土总量的98.65％,属典型富铈低钇型轻...     

采用集中粗选分步精选流程浮选萤石

本文叙述了该厂为提高萤石浮选精矿品位与回收率，排除重晶石对萤石浮选的干扰，将萤石按不同品级加以回收，获得了萤石精矿品位为９６％－９７％、萤石次精矿品位为８５％－８８％，其实际总回收率为７５％－８０％的较好生产指标。     

白云鄂博矿直接浮选稀土工艺流程研究

白云鄂博选矿采用先选铁后回收稀土的流程,稀土回收率不足10%。为探索提高白云鄂博选矿稀土回收率的方法,对原矿直接浮选稀土然后回收铁的开路选别流程做了尝试。结果表明,稀土浮选粗精矿经过三次精选后可获得稀土品位为41.50%,回收率为41.87%的稀土精矿,稀土粗尾矿经过一次磁选可获得铁品位为67.00%,回收率为65.67%的铁精矿。     

浮选矿浆紊流强度对矿物浮选的影响

文章将对包头白云鄂博这个地方的磁铁矿进行探索和分析,研究了矿粒与气泡发生碰撞时碰撞、矿粒的粘附过程和脱附的反应,以及反浮选类的脱除萤石在试验的过程中对矿物浮选的作用和影响。探究的结果显示,适当的减少矿浆紊流强度将对矿物浮选带来有利的影响。文章还包括了包头白云鄂博磁选精矿进行的试验和铝土矿浮选试验过程中,分析了浮选矿浆紊流强度对浮选带来的有利因素和不利因素。     

国外某锡精矿提质工艺研究

国外某生产现场锡精矿,矿石嵌布粒度不均匀,锡精矿品质差,矿石硫含量高,难以直接用于冶炼生产.采用"脱硫浮选-摇床重选-摇床尾矿絮凝浮选"的工艺流程,强化回收部分细粒锡矿物,可以得到产率34.53％,Sn回收率95.49％的综合锡精矿,锡精矿Sn品位从19.89％提高至55.04％,锡精矿含S品位从2.66％降低至0.3...     

桐柏萤石精矿除杂试验

桐柏县非金属选矿厂浮选萤石精矿，其中含二氧化硅、方解石长期未能达到国家标准允许要求。本文叙述了作者在选矿试验中降低萤石精矿的二氧化硅、方解石的药剂组合和提高萤石精矿品位的全选矿工艺方法。     

柿竹园钨钼铋尾矿回收萤石可选性试验研究

介绍了柿竹园钨钼铋尾矿的工艺矿物学性质及可选性试验研究。根据尾矿性质,确定采用预先筛分粗颗粒直接抛尾,细粒级进入萤石浮选,粗精矿精选,产品强磁脱硅,部分中矿单独再选产出低品位萤石精矿的混合流程。最终获得高品位萤石精矿,CaF297．22％,回收率为55．06％,低品位萤石精矿CaF290．89％,回收率为8．16％。     

明矾对氟碳铈矿与独居石浮选分离的影响

在氟碳铈矿与独居石浮选分离中，明矾作调整剂能强烈抑制独居石而使氟碳铈矿与独居石得到有效分离,在白云鄂博混合稀土精矿浮选分离中取得了良好结果.本文讨论明矾对氟碳铈矿与独居石分离的影响。     

Separation techniques

The past two years have seen continued development of capillary electrophoresis methods. The separation performance of flowable sieving media now equals, and in some respects exceeds, that provided by gels. The application of microfabrication techniques to separation science is gaining pace. There is a continuing trend towards miniaturization and integration of separation with preparative or analytical steps. Innovative separation methods based on microfabrication technology include electrophoresis in purpose-designed molecular sieves, dielectric, trapping using microelectrodes, and force-free motion in Brownian ratchets.     

高梯度磁选技术的分选特点及其应用领域

从高梯度磁选技术的分选特点出发,着重总结了高梯度磁选技术的主要应用领域及发展情况。大量研究应用实例表明,高梯度磁选技术在金属矿、部分非金属矿的分选及工业废水处理等诸多领域具有极其广阔的应用前景。最后提出了高梯度磁选技术的发展方向。     

用25号黑药改善分选作业和优化选矿指标

25号黑药具有捕收能力弱，选择性好的特点，用于铅浮选作业做主捕收剂，对改善铅、锌分离效果，优化铅浮选矿指标有重要作用。     

等效分离系数及多组分稀土串级萃取分离工艺设计

以多元稀土串级萃取体系的状态方程为基础，引入等效分离系数，将多元串级萃取体系描述为对分离系数进行修正后的等效双组分分离体系；提出了等效分离系数的计算方法，并对多元串级革取的分高工艺进行设计计算．计算机仿真结果表明，等效分离系数为萃取体系槽级中的最小有效分离系数．     

用25号黑药改善分选作业和优化选矿指标

25号黑药具有捕收能力弱 ,选择性好的特点 ,用于铅浮选作业做主捕收剂 ,对改善铅、锌分离效果 ,优化铅浮选选矿指标有重要作用     

Separation of copper from steel

Abstract

Copper has been separated from iron and steel by chlorine–air mixtures at 800°C. It was found that, contrary to predictions based upon thermodynamics, cupric chloride was the favoured copper product rather than cuprous chloride. This was due to the high vapour pressure of cupric chloride. It was found that in order to prevent the reaction between iron and cupric chloride it was necessary to preoxidise the iron to form an impervious oxide film. Copper contents lower than 0·05 wt-% were readily obtained after 10 min exposure to the gas, even when starting with several per cent of copper mixed with the iron or steel.     

Lanthanides—Separation and Analysis

Having separated rare earth elements, non-selective chromogenic reagents are often used for their detection and/or quantitative analysis. A spectrophotometric study involving rare earth elements and Arsenazo III as a chromogenic reagent has been conducted to establish the dominant equilibria and complexes involved. The results illustrate that the variation in the concentration of complexing agents, for instance a-hydroxyisobutyric acid, which are used to elute the rare earths from columns, is the dominant cause for differences in the intensity of the peaks in chromatograms. The results are used to explain how reliable results can be obtained and inconsistencies regarding interlaboratory comparisons can be avoided.     

Pipeline Column Separation Flow Regimes

A generalized set of pipeline column separation equations is presented describing all conventional types of low-pressure regions. These include water hammer zones, distributed vaporous cavitation, vapor cavities, and shocks (that eliminate distributed vaporous cavitation zones). Numerical methods for solving these equations are then considered, leading to a review of three numerical models of column separation. These include the discrete vapor cavity model, the discrete gas cavity model, and the generalized interface vaporous cavitation model. The generalized interface vaporous cavitation model enables direct tracking of actual column separation phenomena (e.g., discrete cavities, vaporous cavitation zones), and consequently, better insight into the transient event. Numerical results from the three column separation models are compared with results of measurements for a number of flow regimes initiated by a rapid closure of a downstream valve in a sloping pipeline laboratory apparatus. Finally, conclusions are drawn about the accuracy of the modeling approaches. A new classification of column separation (active or passive) is proposed based on whether the maximum pressure in a pipeline following column separation results in a short-duration pressure pulse that exceeds the magnitude of the Joukowsky pressure rise for rapid valve closure.     

金的分离富集

综述了金的分离和富集方法，主要包括各种吸附和萃取方法。采用活性炭和泡沫塑料(简称泡塑)吸附分离金是传统的分离富集法，有负载活性炭和有负载泡塑可以提高富集金的能力。近些年，离子交换树脂和离子交换纤维素在分离富集金的应用中，占有相当大的比例。萃取法除了使用传统的MIBK作为萃取剂，又见报道硫醚、亚砜、醇类等作为萃取剂的各种萃取体系。中引用参考献107篇。