Na3—AlF6—AlF3—LiF—CaF2系熔体变温密度的研究

本文区别于以往的恒温性质，在较宽的成分区域内研究（2．23～3．0）NaF·AlF3－（0～5％）LiF－（0～15％）CaF2系熔体的变温密度，测定结果用三因子二次正交回归数学模型描述。与1000℃恒温性质相比，各因子对变温密度的影响规律出现新特点，它更贴近工业生产实际。本文还绘制一定分子比下的变温密度等值图。此工作为进一步研究本体系等溶变温性质奠定基础，为铝电解工业选择适宜的电解质成分提供理论依据。     

铝电解质初晶温度和电导率数学模型的研究

测定了铝电解质的初晶温度和电导率，求出了一个范围较宽的初晶温度的数学模型。并根据工业铝电解的实际情况，分四段求出了其电解质的电导率数学模型。分析讨论了各因素对铝电解质初晶温度和电导率的影响，并求出了其等值图。     

铝电解质初晶温度和电导率数学模型的研究

测定了铝电解质的初晶温度和电导率,求出了一个范围较宽的初晶温度的数学模型。并根据工业铝电解的实际情况,分四段求出了其电解质的电导率数学模型。分析讨论了各因素对铝电解质初晶温度和电导率的影响,并求出了其等值图。     

Al—Pd—Mn—Mg,Al—Pd—Mn—Zn和Al—Pd—Mn—Mg—Zn系准晶态合金…

本文研究了Ａｌ－Ｐｄ－Ｍｎ－Ｍｇ，Ａｌ－Ｐｄ－Ｍｎ－Ｚｎ和Ａｌ－Ｐｄ－Ｍｎ－Ｍｇ－Ｚｎ三种多元系合金的准晶形成规律、准晶态合金的成分范围和热稳定性。研究结果表明，Ａｌ－Ｐｄ－Ｍｎ－Ｍｇ系准晶态合金的成分范围基本上可按以下范围选择构成，Ａｌ：６０－８０（ａｔ％）、Ｐｂ：０－１０（ａｔ％），Ｍｇ：０－１０（ａｔ％），而Ａｌ－Ｐｂ－Ｍｎ－Ｚｎ为Ａｌ：６０－７５（ａｔ％），Ｐｂ：０－２０（ａｔ％），Ｍｎ：     

铝电解低温电解质体系的研究现状

分析了不同电解质组成对铝电解质体系（主要包含NaF-AlF3、KF-AlF3和NaF-KF-AlF3体系）的初晶温度、氧化铝溶解度及电导率等物理化学性质的影响。指出在低温条件下NaF-AlF3电解体系表现出氧化铝溶解性能较差的缺点；KF-AlF3体系相较于NaF-AlF3体系具有较好的氧化铝溶解性能，但电导率较低，且电解原料中含有钠，随着电解的进行，钠在电解质中不断累积，导致该体系不可避免的变为NaF-KF-AlF3体系；NaF-KF-AlF3体系具有较低的初晶温度，良好的氧化铝溶解性能和电导率，还可以解决钠在电解质中累积带来的问题。因此，NaF-KF-AlF3体系在低温铝电解上是比较有希望得到工业应用的体系。此外，还着重综述了NaF-KF-AlF3体系的研究进展，并探讨了该体系存在的问题及今后的发展方向。     

低分子比铝电解质的槽电阻—Al2O3浓度曲线

低分子比铝电解质的槽电阻－Ａｌ２Ｏ３浓度曲线是实现低分子比铝电解而进行Ａｌ２Ｏ３下料自动控制的基础。本文在实验室铝电解槽上使用低分子比电解质，应用Ｌｅ－ＢｌａｎｃｅＩ－Ｕ曲线法测定了槽电阻计算式Ｒ＝（Ｕ－Ｖｅｘｔ）／Ｉ中的常数值Ｖｅｘｔ，并通过槽电压Ｕ，槽电流Ｉ和Ａｌ２Ｏ３浓度，研制了槽电阻－Ａｌ２Ｏ３浓度曲线。     

H2O2—水杨基荧光酮指示反应体系动力学光度法测定痕量锰

在碱性介质中，痕量锰（Ⅱ）能显著催化H2O2氧化水杨基荧光酮的反应。本文据此建立了测定痕量锰的催化动力学分析法，测定条件为：4．0×10－5mol／L水杨基荧光配（SAF）0．012／H2O2，2．4×10-2mol／LNaOH，60℃。线性范围为0．1～2．0μg／L，方法检测限为0.02μg／L。测得反应表现活化能为20．78kJ／mol。测定了土壤、碳素钢及铝合金等样品中锰的含量，结果满意。     

惰性TiB2阴极在低温铝电解中的应用

在实验室100ATiB2阴极的垂直排铝式电解槽上进行电解,所用电解质分子比为1．5～2．2,电解温度为800～935℃,电解得到金属铝并且电流效率为82．0％～88．3％,直流电耗为11．54～12．05kW·h／kg铝,在TiB2阴极上未发现固体结壳．实验表明：由于使用TiB2阴极,并改变电解槽结构,改善了电解质的循环,既消除了低温电解时的阴极结壳,又可通过降低极距补偿了低分子比电解质的电导率下降。     

催化动力学光度法测定痕量铜

在微酸性介质中，铜（Ⅱ）对磷钼酸氧化碘化钾的反应具有显著的催化作用，本文研究了反应的动力学条件，提出了一种测定痕量铜的动力学新方法。Cu^2 在0－0．64μ/mL范围内，催化－非催化体系在575nm处的吸光度差与铜（Ⅱ）含量成正比，方法检测限为1ng/mL Cu^2 。除Sn^2 、Fe^2 、V^5 等少数离子外，多数共存离子不影响测定。用本法测定氧化镧及铝合金中的痕量铜，结果满意，样品标准加入回收率为95．6％－98．4％。     

Cd（Ⅱ）—KI—TritonX—100络合吸附波的研究及应用

研究了在微酸介质中,Ｃｄ（Ⅱ）－ＫＩ－ＴｒｉｔｏｎＸ－１００体系的极谱行为,该络合吸附波的峰电位为－０．７２Ｖ（ｖｓ．ＳＣＥ）,Ｃｄ（Ⅱ）浓度在２～３００ｎｇ／ｍＬ范围内与峰高呈线性关系。用于直接测定硫酸镍、硫酸锰和硫酸锌中的镉。方法准确、简便、精密度高,选择性、稳定性良好,相对标准偏差小于４％,回收率均在９８％～１０２％。     

New energy vehicle:an opportunity for rare earth magnets

<正>Extracted from Securities Guide 1.Popularity of new energy vehicles—an irresistible market trend1.1 Progress of new energy vehicles Chinese Premier Li Keqiang said recently on a visit to Xi'an BYD Autos that new energy vehicles,especially new energy bus,can lessen environment and noise pollution.He encouraged the use of new     

China rare earth market review

正November 1~10,2014Chinese rare earth market was still inactive.Demand for rare earth products was weak.Consumers took a wait-and-see attitude for lower price.As it was an off season for rare earth products,it was expected that prices of rare earth could continue turbulence at the bottom in short terms.Due to a sharp drop,demand for rare earth from downstream recovered.Affected by new energy vehicles,wind powder and energy-efficient appliances,production of rare earth permanent     

China rare earth market review

正August 1~10,2014 There was some good news in rare earth industry recently.Restructuring plans of rare earth groups led by Baotou IronSteel Group and Xiamen Tungsten Group respectively have been approved by MIIT.And rare earth storage policy,which had been expected for a very long time,has been launched officially.Pushed by the good news,rare earth price started to rebound since August 5.Price of didymium oxide and dysprosium oxide rose about 1% to 2%,averagely.About 10% of     

China rare earth market review

正July 1~10,2014Due to weak demand from downstream industry and slow transactions,rare earth market remained weak and price of rare earth products continued to decline.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,     

注浆加固技术在十三矿-685 m进风大巷中的应用

针对煤矿开采深度不断向深部延伸,掘进巷道受深部高应力的影响越来越大,巷道围岩整体稳定性差,矿山压力显现越剧烈现象,一般锚网喷加锚索支护无法从根本上控制巷道的变形。总结了平煤股份十三矿-685 m进风大巷注浆加固技术,依据对巷道掘进之后变形监测数据的采集,对巷道变形机理进行分析研究,并对注浆时段进行了合理选择,在对巷道的注浆工艺进行了充分论证的基础上,对巷道进行了注浆。注浆后效果表明:巷道滞后注浆时间段的选择非常重要,巷道在恰当的时间内进行注浆加固施工,能有效控制巷道的变形,巷道注浆后变形量明显减小,岩体的稳定性明显增强,减少了巷道日常维修工作,降低了矿井的生产成本,保障了矿井的安全生产。     

Brief news

正China Minmetals Rare Earth Construction of Jianghua Separation Plant is set to complete at the yearend Civil works of Jianghua Separation Plant have been finished and the company is installing and debugging equipments now.It is estimated that construction of Jianghua Separation Plant will be     

Brief news

正Total transactions of rare earth in Rare Earth Ex-change Center of Hunan South Rare and Precious Metal Exchange neared 40 billion yuan from January to October From the opening in January of this year to the end of October,the total transaction of rare earth products in Rare Earth Exchange Center of Hunan South Rare and Precious Metal Exchange neared40 billion yuan.There are 16 varieties including dysprosium oxide and terbium oxide traded on the exchange center,one of the largest trading platforms for rare earth oxides in China.     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Theoretical basis for optimal collector concentrations and pulp pH values during flotation of sulfide-free minerals

A hypothesis that associates optimal conditions of mineral flotation with a zero charge of their surface is put forward. This hypothesis serves as a basis for a methodology to obtain and verify quantitative physical-chemical models for a minimal necessary concentration of a collector during flotation of sulfide-free minerals. These models may be of use for upgrading engineering processes of flotation and as a job for the concentration plant automation systems. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 89–99, March–April, 2006.