C5—9羟肟酸浮选赤铁矿

应用热力学,动力学理论分析了由羟胺与羧酸衍生物反应合成羟肟酸的各合成路线,采用最佳路线－酰氯羟胺化法合成Ｃ５－９羟肟酸,用于浮选内蒙古乌海地区某铁矿的地表氧化矿中的细粒赤铁矿,小型粗选试验表明,用该法合成的Ｃ５－９羟肟酸对赤铁矿的选别能力优于新特２号,石油磺酸钠,水杨羟肟酸以及用酯化法生产有Ｃ５－９羟肟酸等捕收剂。／     

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%。      

特戊羟肟酸的合成及其对铝硅矿物的浮选性能研究

采用羟胺法合成了特戊羟肟酸, 并研究了其对铝硅矿物的浮选行为及作用机理。单一捕收剂浮选一水硬铝石时, 特戊羟肟酸的浮选效果优于苯甲羟肟酸; 将特戊羟肟酸和油酸钠按1∶1进行复配, 浮选研究结果表明, 复配捕收剂既能提高一水硬铝石的回收率, 又能降低伊利石和高岭石的回收率, 具有更好的选择性; pH=7, 复配捕收剂浓度60 mg/L时, 一水硬铝石回收率可达86.8%。通过接触角、Zeta电位和红外光谱分析等对捕收剂与矿物表面的作用机理进行了探究, 发现油酸钠在一水硬铝石表面主要进行物理吸附, 而特戊羟肟酸主要为化学吸附, 二者复配能更有效地与一水硬铝石作用。     

苯甲羟肟酸捕收白钨矿浮选溶液化学研究

用浮选溶液化学的观点论述了白钨矿与苯甲羟肟酸溶解组分的logC -pH图 ,从理论上分析白钨矿表面的ζ -电位与矿浆 pH值的关系。浮选溶液化学研究结果表明 ,用苯甲羟肟酸捕收白钨矿过程中 ,当pH <1.3时 ,虽然白钨矿表面带正电 ,但苯甲羟肟酸没有解离 ,不利于苯甲羟肟酸阴离子的吸附 ;在 4.7相似文献   

Fe-BHA用于白钨矿的浮选分离

将FeCl3与苯甲羟肟酸按一定比例混合,形成一种金属离子螯合物Fe-BHA,用于白钨矿-方解石人工混合矿浮选分离。在pH值为7.7时,取得最佳的白钨精矿回收率为68.00%,白钨矿分离指数为2.83,可实现白钨矿在较高精矿回收率的前提下与方解石的有效分离;而在白钨矿-萤石人工混合矿的浮选分离试验中,在pH值11.0时,取得的萤石精矿回收率为78.20%,分离指数为3.51,理论上可以实现白钨矿与萤石的分离。Fe-BHA用于香炉山白钨矿实际矿石的粗选验证试验,在适宜条件下,可获得产率为30.53%、精矿中WO3品位为1.56%、回收率为63.50%的白钨精矿,相比同条件下单独使用苯甲羟肟酸的浮选结果较好。白钨矿的红外光谱证明了Fe-BHA在白钨矿表面化学吸附的存在。     

苯甲羟肟酸体系中烧绿石与方解石分离及机理研究

本文以油酸和苯甲羟肟酸为捕收剂,探索正浮选流程,研究不同捕收剂对烧绿石和方解石浮选影响,并探究在苯甲羟肟酸体系下两种矿物浮选分离的机理。研究表明,在最佳pH条件下,油酸、苯甲羟肟酸对烧绿石和方解石都有较好的捕收能力,苯甲羟肟酸的选择性较好。在pH=6时,Pb2+可以扩大苯甲羟肟酸对烧绿石和方解石可浮性差异。机理研究表明,在pH=6时,苯甲羟肟酸以离子—分子共吸附模式在烧绿石和方解石表面发生了以化学吸附为主物理吸附为辅的吸附作用,从而对矿物具有捕收能力。     

苯甲羟肟酸钠与C18烷(烯)酸钠协同浮选金红石的机理研究

研究了金红石在苯甲羟肟酸钠与C₁₈烷(烯)酸钠复合体系中的浮选特性, 采用多种界面化学检测手段研究了组合药剂之间以及组合药剂与金红石的作用机理。结果表明: 试验条件下四种药剂对金红石捕收能力的大小顺序为: 亚麻酸钠(ε_max=89.23%, ε为回收率)>亚油酸钠(ε_max=69.57%)>苯甲羟肟酸钠(ε_max=38.43%)>硬脂酸钠(ε_max=7.13%)。具有相同碳原子数的脂肪酸钠分子中的双键数目对药剂的捕收能力及药剂组合的协同效应影响较大, 深层次的原因则是双键数目的多少可对脂肪酸类药剂的krafft点、分子结构及其与苯甲羟肟酸钠之间的作用力产生不同影响。三种药剂组合对金红石捕收能力的大小顺序为: 苯甲羟肟酸钠+亚油酸钠≈苯甲羟肟酸钠+亚麻酸钠?苯甲羟肟酸钠与硬脂酸钠。脂肪酸类药剂分子中的双键可与苯甲羟肟酸钠分子中的苯环产生电子共轭效应, 该效应所生成的缔合物种类及其空间构象是影响组合药剂浮选效果的关键因素。苯甲羟肟酸钠和亚油酸钠体系中金红石的浮选行为与其带隙变化有较好的对应关系, 但苯甲羟肟酸钠与亚麻酸钠体系中的对应关系则不明显, 具体原因则有待于进一步研究。      

关于烷基羟肟酸试选东鞍山铁矿石的研究

为寻求一种能更好替代塔尔油氧化石蜡皂选别东鞍山赤铁矿石的捕收剂，本文论述了C5～C9烷基羟肟酸应用到铁矿石的浮选上，并同塔尔油氧化石蜡皂进行小型试验对比。结果表明，在适宜条件下，可能替代现场药用于生产。     

用浮选药剂的同分异构原理寻找浮选锡石和黑钨矿捕收剂

水杨醛肟能捕收黑钨矿和锡石,但未见在生产实践中应用。苯甲羟肟酸是水杨醛肟的同分异构体,有相似的官能团。根据浮选药剂的同分异构原理推测,苯甲羟肟酸亦应能捕收黑钨矿和锡石。通过实践证明苯甲羟肟酸不但能捕收黑钨矿和锡石,而且它的合成工艺简单,浮选效果好,在选矿工业生产中得到了推广应用。该实例证明浮选药剂的同分异构原理是正确的。     

黑钨矿与不同类型石榴石矿浮选行为研究

细粒黑钨矿与石榴石矿分离困难。为了实现细粒黑钨矿的高效回收，研究黑钨矿与不同类型石榴石矿浮选分离行为机理，提供黑钨矿与不同类型石榴石矿浮选分离方案。对黑钨矿及三种不同类型石榴石矿进行了pH试验、捕收剂用量试验、金属离子用量试验、抑制剂用量试验、药剂吸附量测定、红外光谱测试。结果表明，在pH=8、苯甲羟肟酸用量250 mg/L、Pb(NO₃)₂用量10 mg/L、水玻璃用量100 mg/L的情况下，黑钨矿回收率可达90.55%,三种不同类型石榴石矿回收率只有16.11%、7.80%、4.95%,实现了黑钨矿与三种不同类型石榴石矿的有效分离。机理研究表明，苯甲羟肟酸在黑钨矿及三种不同类型石榴石矿表面发生化学吸附；Pb(NO₃)₂对苯甲羟肟酸在黑钨矿及三种不同类型石榴石矿表面的吸附起到促进作用；水玻璃对黑钨矿的浮选没有抑制作用，但强烈抑制了三种不同类型石榴石矿的上浮。     

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

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