文摘

铈电势测定法的一种新型离子的选择电极 :KaramiH ,etal ,AnalyticalLetters,2 0 0 3,36( 6) ,1 0 65～ 1 0 78电势测定Ce(Ⅲ )的新型膜离子选择电极(ISE)以一种新的配合基N [(Z) 2氯 2 ( 1 羟基 1 ,1 ,1 三苯基正膦基 ) 1 乙酰基 ]4 乙基 1 氨磺酰苯为骨架并作为离子载体。该电极的线性动态范围宽 ( 6 6× 1 0 - 7～ 6 2× 1 0 - 2 mol/L ,n =1 0 ,r =0 9994) ,最低检测限为 2 3× 1 0 - 7mol/L。方法具有快速的响应时间 ( <1 0s) ,对不同的金属离子均具有很好的选择性。在至少 4个月的使用中 ,未见电势响应有重大变化。在pH …     

硫代硫酸盐法浸出某微细浸染型金矿中的金

国外某微细浸染型金矿中金的品位为2.58g/t,采用X射线荧光光谱分析(XRF)、X射线衍射分析(XRD)、冷场发射扫描电子显微镜—能谱仪(SEM-EDS)以及火焰原子吸收分光光度计(AAS)对原矿矿相组成以及性质进行了分析。在此基础上,采用硫代硫酸钠—铜氨络合体系直接搅拌浸出工艺进行浸金试验。考察了硫代硫酸钠、硫酸铜和氨水浓度、液固比、pH值以及搅拌速度对浸金效果的影响。研究了两种稳定剂Na_2SO_3和(NH_4)_2SO_4对减少硫代硫酸盐消耗量的影响。结果表明,在常温常压、磨矿细度-0.05mm粒级占90%、Na_2S_2O_3·5H_2O浓度0.15mol/L、CuSO_4浓度0.035mol/L、氨浓度0.3mol/L、(NH_4)_2SO_4浓度0.1mol/L、Na_2SO_3浓度0.005mol/L、液固比4∶1、pH值10.5、搅拌速度为300r/min、浸出3h的条件下,金的浸出率可达到73.26%;Na_2S_2O_3用量对金的浸出率有着决定性影响,硫代硫酸盐浓度越高,金的浸出效果越好;适宜浓度的铜和氨对金的浸出具有催化效果,过量则会使金的浸出效果变差;(NH_4)_2SO_4和Na_2SO_3可以作为Na_2S_2O_3的稳定剂,降低硫代硫酸盐的消耗量,(NH_4)_2SO_4可与氨水形成缓冲体系,稳定浸出液pH值,降低Na_2S_2O_3的分解,适量的Na_2SO_3有利于重新转化生成Na_2S_2O_3,过量的Na_2SO_3则会恶化金的浸出。     

铀-苯甲酸盐络阴离子PVC膜电极的研究和应用

本文介绍了一种以铀(VI)-苯甲酸盐-次甲基蓝三元络合物为活性材料的PVC膜铀电极,它对络阴离子UO_2(C_6H_5COO)_3~-有选择性响应。在铀浓度为5×10~(-4)～5×10~(-6)M,电极有近似的能斯特响应,斜率为53±2毫伏(11℃)。电极对pH的变化比较敏感,电极电势仅在pH为4.6～5.1相对比较稳定。将此电极与TBP-萃淋树脂的分离方法相结合,可以进行复杂水冶样品中铀的测定,结果与化学法很接近。     

高砷金精矿硫代硫酸盐浸出试验研究

以某高砷金矿经两次粗选—两次精选—四次扫选选别得到的含金24.6g/t的金精矿为原料,采用响应曲面法对该金精矿硫代硫酸盐浸出过程进行优化分析,同时探索了S_2O_3~(2-)、NH_4~+和Cu~(2+)浓度等因素对浸出效果的影响。结果表明,浸出溶液中的S_2O_3~(2-)、NH_4~+和Cu~(2+)浓度对金浸出率的影响程度依次是[S_2O_3~(2-)]>[Cu~(2+)]>[NH_4~+]。在浸出时间4h、浸出温度40℃、矿浆pH值10、搅拌速度300r/min、硫代硫酸钠浓度0.5mol/L、硫酸铵浓度1.0mol/L、铜离子浓度为0.035mol/L条件下可获得最佳的浸出效果,最佳金浸出率为90.28%,可实现该高砷金精矿中金元素的有效回收。研究结果可为解决该类型浮选金精矿浸出方案和高砷金精矿硫代硫酸盐浸金工艺提供参考。     

文摘与简讯

用皂类浮选法分离铝矾土与赤铁矿以C_(6-12)脂肪酸皂为捕收剂,研究了人工Al_2O_3与赤铁矿和天然赤铁矿的浮选,以便从赤铁矿中分离Al_1O_3。使用辛酸盐,以KF为Al_2O_3的抑制剂,从人工赤铁矿中分选Al_2O_3是可能的。在PH5.5—6.5条件下,当使用2×10~(-3)M(2.3公斤/吨矿石)的KF和7×10~(-5)1×10~(-4)M(0.2—0.3公     

示波极谱法测定铅锌矿中的砷

在含有0.42mol/L盐酸、5.84×10-4mol/L钼酸铵、3.60×10-4mol/L酒石酸锑钾、3.45×10-3mol/L抗坏血酸和10%丙酮的底液中加入As(V),形成砷锑钼三元杂多酸,在单扫描示波极谱仪上产生一灵敏的络合吸附波,峰电位Ep=-0.37V(vsSCE),当As(V)浓度在5.34×10-8～1.07×10-5mol/L范围时,峰电流与As(V)浓度呈线性关系,检出限为2.19×10-8mol/L.用于测定铅锌矿中的砷,不需分离,可直接测定,测定结果与标样值吻合.加料回收率为93%～110%.     

石英粉去除铝、钾、钠的研究

采用浮选法和超声波酸浸法去除石英粉中的铝、钾、钠杂质,用原子吸收分光光度计分析经浮选和酸浸处理的样品中铝、钾、钠杂质的含量。结果表明,较佳的除杂工艺参数是:在pH=2,十八胺浓度范围为8.0×10-7～8.0×10-6mol/L,十二烷基磺酸钠的浓度为4×10-6mol/L时浮选;浸出的混合酸为18%的盐酸和2%的氢氟酸,浸出温度为50℃,超声波酸浸处理1h。在此条件下,可使石英中铝含量从128×10-6下降到14×10-6,钠含量从114.7×10-6下降到1.2×10-6,钾含量从8.6×10-6下降到0.4×10-6,达到高纯石英砂的标准。     

极谱催化波测定痕量钴-二氮菲-硫脲-四乙基碘化铵体系

钴在1×10~(-6)M二氮菲-2×10~(-3)M硫脲-6×10~(-4)M四乙基碘化铵介质(NH_4OHNH_4Cl缓冲液,pH9.3)中产生灵敏的催化波。峰电位为-1.65伏(VS.S.C.E.),检测下限为5×10~(11)M。钴的浓度在1×10~(10)-1.3×10~8M范围内与峰高呈线性关系。本法灵敏度高,选择性好、操作简便。已用于直接测定锌精矿、锌电解液和废水中痕量钴。     

SiO_2改性BaSO_4制备及对PVC力学性能的影响

基于溶胶-凝胶法,合成Si O_2改性Ba SO_4复合材料,利用傅里叶红外光谱(FT-IR)仪、X射线衍射(XRD)仪、扫描电镜(SEM)和粒度分析仪等对其结构与性能进行表征,分析改性Ba SO_4复合材料的粒径分布、沉降时间和活化度,并将其添加在PVC中,进一步研究改性Ba SO_4对PVC基材力学性能的影响。结果表明,Si O_2复合量为1.4～1.6 mol时,改性Ba SO_4复合材料的粒径分布较窄且均匀,与未改性样品相比,当Si O_2复合量为1.4 mol时,其沉降时间和活化度达到最大值27.8 h和81.8%,分别提高25.5 h和48.5百分点。改性Ba SO_4有助于提高PVC基材力学性能,当添加量为10%时,改性Ba SO4/PVC复合材料综合力学性能最佳,撕裂强度可达156.78 MPa。     

Na_2S_2O_3对镍钴电池负极材料电化学性能的影响

通过向镍钴电池的电解液中加入不同浓度Na_2S_2O_3,并研究了其对镍钴电池负极材料电化学性能的影响,采用SEM和XRD分析了沉淀产物的微观形貌和结构。结果表明,通过对钴电极的充放电性能测试发现,当Na_2S_2O_3浓度为0.04mol/L时,Co电极的最大放电容量高达411.1mA·h/g,当Na_2S_2O_3浓度0.02mol/L时,Co电极的循环稳定性最好,其容量保持率为86.16%,比未加Na_2S_2O_3时的容量保持率高出30.71个百分点。结合循环伏安特性曲线(CV)和交流阻抗图谱(EIS)分析得知,Na_2S_2O_3能够有效抑制CoOOH的形成,提高活性物质的利用率,从而实现放电容量和循环稳定性的提高。     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.     

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     

2014 second batch of rare earth quota released

正~~