羟肟酸类捕收剂浮选金红石特性及其机理

浮选药剂的研究是金红石浮选技术发展的重要方向。通过单矿物浮选试验、扫描电镜、红外光谱分析、接触角测试及吸附量测试,研究了苯甲羟肟酸、水杨羟肟酸、辛基异羟肟酸对金红石浮选行为的影响以及三种羟肟酸在金红石表面的吸附机理。结果表明:苯甲羟肟酸、水杨羟肟酸、辛基异羟肟酸在pH值分别为6.5、6.5、5.5左右时,对金红石纯矿物具有较好的捕收性能。金红石与三种羟肟酸均发生化学吸附,但苯甲羟肟酸捕收性能最好,回收率达到82%。      

搅拌作用下石英对金的吸附作用研究

试验将石英和金溶液进行混合搅拌试验研究,在不同的石英细度、金溶液浓度、矿浆浓度和搅拌时间条件下,通过计算吸附率、吸附量来考查石英对溶液中金的吸附规律。试验结果显示:在搅拌作用下,石英的细度、金溶液浓度以及搅拌时间增加都能够促进石英对溶液中金的吸附,基本呈正相关趋势。但是,当矿浆浓度在16.67%～22.22%时,金吸附量随矿浆浓度的增加而增加,当矿浆浓度在22.22%～37.50%时,金吸附量随矿浆浓度增加反而降低。矿浆浓度增加吸附率增加。Dubinin-Radushkevich和Langumir等温吸附模型证实了搅拌作用下石英对金的吸附类型为物理吸附,并且为有利吸附。本研究为金的综合回收利用提供了理论依据。     

含氰金废液中微量金的测定

本文研究了353E大孔双官能团阴离子交换树脂对金的吸附性能,以及银、铜、锌、镍、铁在树脂上的吸附性能,并对金的富集分离条件进行了选择。在pH10以上的氰化介质中,令以Au(CN)_2~-络阴离子吸附在353E脂树上,用0.1mol/L盐酸-3％的硫脲溶液解吸时,金很容易被洗脱,解吸后的金(Ⅰ)可直接进行原子吸收测定。对于0.02—0.5μg/ml Au的试样,相对标准偏差优于±5％,金的回收率为97—101％。方法用于含氰废水中微量金的测定,获得满意结果。     

碘化浸金时从浸出液中提金及碘再生方法研究

用实验方法研究了锌置换金、活性炭吸附金及电解回收金,并探讨了用电解法回收碘。研究结果表明：用活性炭吸附、解吸液电解提取金及电解法再生碘溶液是切实可行的。     

CL-N235萃淋树脂富集分离金的性能与机理研究

用原子吸收法研究了在盐酸介质中N235萃淋树脂吸附金的过程。结果表明,树脂对金的吸附性能很好,金的吸附量达860mg/g干树脂,饱和树脂与金摩尔比为1.08,树脂吸附选择性好,共存金属除铋外吸附率都很低,因此可用来从大量贱金属中吸附富集金。吸附焓变化为17.56 kJ/mol.K,红外与拉曼光谱研究表明,树脂吸附金的形态为AuCl4-。     

氰化物溶液中活性炭吸附金的研究

我们在用“堆浸法”从低品位含金氧化矿中提金的试验同时,对国产的若干种活性炭从低浓度的金氰化物溶液中吸附金的特性进行了研究。我们主要考查了它们的吸附热力学和吸附动力学特性,探讨了活性炭吸附     

用离子交换树脂从氰化物溶液中回收金的技术及其展望

树脂提金是一种先进的无过滤提金技术,金在树脂上的吸附容量很高,有机物质对树脂的吸附过程影响不大,树脂提金工艺成熟,回收率高,对矿石的适应性强。本文将探讨离子交换技术浸金的化学原理,浸金树脂类型研究的最新进展及其前景以及在生产中的工艺特点。     

水杨羟肟酸在金红石表面的吸附特性研究

以水杨羟肟酸在金红石表面的吸附特性为研究对象,系统考察了药剂p H值、药剂浓度、矿浆温度对水杨羟肟酸离子在金红石表面的吸附动力学及热力学的影响。结果表明,水杨羟肟酸离子在金红石表面的吸附动力学符合准二级动力学方程,金红石表面活性质点在矿物表膜中的扩散是吸附过程的控制性步骤;药剂吸附等温线符合Langmuir模型,吸附过程的ΔG随温度上升而降低,但随药剂浓度的增加而增加;温度低时水杨羟肟酸在金红石表面的吸附属于离子交换吸附模式,但在温度升高时转变为化学反应吸附模式。     

荔枝壳吸附剂对金离子的吸附行为研究

为回收浸液中的微量金离子,利用荔枝壳制备金离子吸附材料,借助多种仪器对荔枝壳进行了表征分析,详细研究了其吸附金离子的行为及过程机理。在偏光显微镜下观察到吸附后的荔枝壳上出现分散细小的金颗粒,X射线衍射进一步证实该颗粒为金单质。氯金酸离子被吸附是静电吸引与原位还原的耦合过程,而荔枝壳中的多酚被认为是导致金离子被还原的主要电子给予体。XPS分析确认,吸附后的金离子至少94.9%以上被还原为金单质。盐酸浓度和共存贱金属杂质离子对金的吸附效率影响不大,而在1 mol/L的HCl中,几乎50%的Pd和35%的Pt也会被同时吸附。而在0.1 mol/L的HCl介质中,100%的Pd和100%的Pt将被同时吸附。在0.1 mol/L的盐酸浓度下,改性荔枝壳对金的饱和吸附量为33.36 mg/g。在吸附过程中,溶液的ORP(氧化还原电位)值会急剧下降,也证实了荔枝壳吸附金离子过程中发生了还原作用,而且吸附温度越高,ORP值也下降越快。本研究工作利用荔枝壳制备吸附材料,方法简单、成本低、高效绿色,可望成为吸附法回收工业废水中微量金离子的新技术。     

辛基羟肟酸对金红石的浮选行为

通过微浮选试验、ζ电位测试、X射线光电子能谱(XPS)测试,研究了辛基羟肟酸对金红石在硝酸铅活化前后的浮选行为。未经硝酸铅活化的金红石很难被辛基羟肟酸浮选,在pH=6.5、硝酸铅浓度为5×10-5 mol/L、辛基羟肟酸浓度为5×10-5 mol/L时,金红石的回收率达83%,表明辛基羟肟酸是金红石在硝酸铅活化后的高效捕收剂。ζ电位测试结果表明,铅离子可以在金红石表面吸附,使矿物的ζ电位正移,可以促进辛基羟肟酸在金红石表面的吸附。此外,XPS测试结果表明,吸附的铅离子在金红石表面生成了PbOH+,辛基羟肟酸通过金红石表面的铅作用而吸附在矿物表面。     

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     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586     

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     

唐口煤矿深部复杂开采工作面瓦斯分源涌出规律研究

研究工作面瓦斯涌出规律对工作面瓦斯治理有重要意义。为了得到唐口煤矿深部3号煤层复杂开采条件下工作面回采时期瓦斯涌出时空演化规律,选取6304工作面作为对象,采用实测方法研究6304工作面瓦斯涌出规律。结果表明:6304工作面瓦斯涌出量为6.534 m³/min,其中煤壁占34.27%,落煤占29.62%,采空区占36.11%;沿工作面倾向由低到高,瓦斯浓度整体为上升趋势,其中1—76号架工作面瓦斯浓度小于0.20%,76—102号架瓦斯浓度上升明显,最大为0.387%;上隅角的后部采空区是工作面的瓦斯主要涌出源,上隅角1号测点瓦斯浓度0.78%,上隅角周边3号、5号、7号、8号、9号测点瓦斯浓度平均为0.643%;周期来压时,上隅角瓦斯相对平时较高。研究为针对性的瓦斯分源监控与灾害防治提供基础。