异丙基黄原酸甲酸乙酯的合成及应用

考察了不同条件对异丙基黄药合成异丙基黄原酸甲酸乙酯的影响.通过对江西武山铜矿的浮选试验研究表明,异丙基黄原酸甲酸乙酯与黄药相比,对硫化铜矿具有更高的回收率、提高了铜精矿中铜的品位.     

定量分析被吸附的黄药捕收剂的方法

用顶空分析气相红外光谱法（HAGls）对方铅矿／黄药体系中吸附在矿物表面上的黄药进行了定量分析。考查了4个可能的标准：异丙基黄原酸钠、异丙基黄原酸铅、与异丙基黄原酸钠搅拌过的方铅矿和与异丙基黄原酸钠搅拌过的硫化铅矿石。对4个体系都得到了线性标定曲线。试验结果表明，用矿石作为标准具有实用价值。     

国外黄原酸甲酸酯的研制与应用

黄原酸甲酸酶CXanthogen (?)o rmate)是当前世界上广泛应用,供应量最高的非离子型酯类捕收剂。本文根据国外部分文献,对其制备与应用的有关问题,略予综述。黄原酸甲酸酯可由烷基钠黄药和氯甲酸     

捕收剂Minerec—B试制成功

<正> 我们试制成功了捕收剂Minerec-B。这种药剂的主要成分为丁基黄原酸甲酸乙酯。它由氯甲酸乙酯同丁基黄原酸钾(或钠)反应而成。所用的氯甲酸乙酯是光气通入乙醇中、在5℃条件下反应而得。     

硫酸铵在氧化铜矿相转移活化浮选中的作用

硫酸铵不仅对氧化铜矿的硫化－黄药浮选具有硫化促进作用，而且在氧化铜矿的直接浮选中具有活化作用。这种活化作用经历了从固相到液相再到固相的相转移活化过程。在“相转移活化”中，硫磺铵的主要作用表现为下列三个方面：（1）增溶作用，即硫酸铵能选择性地溶解孔雀石表面反应活性大的离子，溶解后的矿物表面易于吸附黄药；（2）传递作用，即所溶解的铜离子与硫酸铵结合成铜氨络离子，加入黄药后．铜氨络离子离解，将铜离子传递给黄原酸阴离子；（3）对黄药具有增强吸附作用，即硫酸铵的存在能增加黄药在矿物表面的吸附量，加快吸附过程，同时还阻止了黄原酸铜向溶液解吸．这三种作用构成了硫酸铵对孔雀石“相转移活化”的实质。     

酯-105起泡性能的研究

<正> 酯—105(二乙胺基二硫代甲酸氰乙酯)是一种非离子型捕收起泡剂。为了考察该药剂中各极性基团的起泡性能,我们合成了几种与酯—105结构稍异的有机化合物与酯—105进行比较,以确定在酯—105的分子结构中有起泡性能的主要作用基团。一、几种有机化合物及其含量五种有机化合物的分子结构1号,酯—105: 2号,异丙基黄原酸氰乙酯: 3号,二乙胺基二硫代甲酸丙酯:     

异丙基黄原酸离子在砷黄铁矿上的吸附及其对浮选的影响

通过在pH6进行的动电、伏安和静电位测量，研究了异丙基黄原酸离子[(CH3)2CH-OC2^-]在砷黄铁矿(FeAsS)上的吸附，还在同一pH下测定了在异丙基黄原酸盐离子的溶液中异丙基双黄药[(CH3)2CH-OCS2-S2CO-CH((2H3)2]液滴的动电行为。吸附首先是异丙基双黄药通过黄原酸离子的阳极氧化反应吸附，此时对砷黄铁矿的Zeta电位没有影响。然后通过异丙基黄原酸离子与被吸附的双黄药疏水缔合吸附在砷黄铁矿／水溶液界面上，使砷黄铁矿的Zeta电位向负值方向增加。在双黄药-砷黄铁矿／水溶液界面上的负电荷限制这两个吸附阶段。微浮选研究表明，双黄药使砷黄铁矿的浮选较好。这种浮选不受双黄药-砷黄铁矿／水溶液界面上异丙基黄原酸盐离子的极性基团(OCS2^-)影响。     

乙基黄药同黄铁矿作用行为的紫外光谱研究

利用紫外光谱研究了不同ｐＨ值时以及硫酸铜、亚硫酸盐和石灰存在时乙基黄药与黄铁矿的相互作用行为。用己烷萃取的方法测定了乙基黄药同黄铁矿作用后产生的双黄药。结果表明，黄药同矿物作用后产生的双黄药是随着ｐＨ值的增大而降低，高ｐＨ值时未发现有双黄药；用硫酸铜活化黄铁矿，体系中的乙基黄药以双黄药、一价铜的黄原酸盐的形式存在，疏酸铜用量高时，二价铜的黄原酸盐也较明显；加入亚硫酸钠、亚硫酸氢钠以及硫代硫酸钠，ｐＨ９左右时，产生的双黄药量同不加时的同ｐＨ值比较要低，且随着黄药作用时间延长而减少；在亚硫酸钠和亚硫酸氢钠存在的溶液中，发现有过黄原酸盐。     

改性膨润土对黄药吸附性能的研究

通过离子交换反应，将天然钙基膨润土制成铜基和ＨＤＴＭＡ有机膨润土。铜基土能直接吸附黄原酸根离子，同时对其氧化反应产生催化作用。有机土对黄药及其氧化产物黄原酸亚铜与双黄药均产生吸附。两种改性土联用则能显著提高黄药的去除能力。     

改性膨润土对黄药附性能的研究

通过离子交换反应，钭天然钙基膨润土制成铜基和ＨＤＴＭＡ有机膨润土。铜基土能直接吸附黄原酸根离子，同时对其氧化反应产生催化作用。有机土对黄药及其氧化产物黄原酸亚铜与双黄药均产生吸附。两种改性土联且则能显著提高黄药的去除能力。     

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     

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     

2014 second batch of rare earth quota released

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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