不同改性膨润土净化含磷废水效果的试验分析

以天然膨润土作为载体,分别采用酸、碱、铝盐、羟基铝柱撑、热活化等物理化学改性方法对其改性,并综合分析其净化含磷废水的处理效果,改性后膨润土比表面积增加,其活性吸附点和吸附位也大幅增多,进而提高了其表面吸附能力.改性后膨润土吸附净化能力由强至弱依次为:羟基铝柱撑膨润土、铝盐改性膨润土、热改性膨润土、酸改性膨润土、碱改性膨润土;羟基铝柱撑膨润土最佳改性条件为保持OH-与Al3+质量比2.2,搅拌静置后去除上清液,残留物洗净后烘干,其净化含磷废水的最佳试验条件为:在pH值为6的废水溶液中投入3 g改性膨润土,恒温振荡吸附60 min,此时废水中磷去除率可达95.2%.     

不同改性膨润土对含磷废水的吸附试验研究

以东北建平膨润土为原料,采用KH2PO4溶液模拟含磷污水,分别对膨润土进行焙烧、酸碱药剂、钠盐及组合工艺改性研究,通过偏钼酸铵分光光度法测量改性膨润土对磷的吸附量。结果表明,几种改性后的膨润土吸附性能都得到一定改善,其中酸改性和焙烧改性膨润土对磷的吸附效果最好,最终通过正交试验得出最优组合工艺方案,当膨润土投加量为0.6 g,H2SO4质量分数为10%,改性温度为400℃时,膨润土吸附后的上清液中磷质量浓度达到最小。     

膨润土酸改性技术及改性土对水体中磷吸附研究

以吉林刘房子膨润土为研究对象，对原土进行了酸改性，并将酸改性膨润土用于水体中磷的吸附试验。结果表明：酸改性膨润土对磷有较好的吸附作用。最佳条件为：酸改性试验中膨润土（g）和改性剂（mL）的固液比为20：100，吸附实验中酸改性膨润土的投加量为0．5/100mL，吸附时间为4h。     

文山膨润土的表征及其改性研究

对云南文山膨润土的理化性能进行系统研究,确定了化学组成,并进行钠化改性实验.通过XRD、DTA及IR等对晶相结构进行分析表明,该膨润土为钙基膨润土,吸附性能较好,经钠化改性后其性能可达到一级土标准,有较好的应用前景.     

用鄂州膨润土处理南湖水体中磷的试验研究

以鄂州膨润土为吸附剂,对武汉市南湖水中的磷进行吸附处理。通过单因素实验,确定适宜的吸附条件:当水体中磷的初始浓度为1.108 mg/L时,在搅拌时间为15 min,膨润土的投加量为2.0 g/L,搅拌速度为200 r/min,pH值为4.2～7.4的条件下,膨润土对南湖水中磷的去除率可达到98%以上,吸附容量为0.543 mg/g,并通过红外光谱分析了吸附剂的变化特征。实验表明,鄂州膨润土可应用于磷污染的湖泊水体的治理。试验结果对于进一步拓展鄂州膨润土的应用具有一定的指导意义。     

Ca-基膨润土制备重金属废水吸附剂的研究

膨润土因其特殊的晶体结构而具有良好的吸附能力、阳离子交换能力和吸水膨胀能力等性能。近年来，随着人们对其结构和理化性能的进一步了解，膨润土的高层次开发已成为非金属矿物材料的研究热点。文中对钙基膨润土进行了改性处理，并着重探讨了Ca-基膨润土对重金属废水的吸附，并对含Cr^6 和Cu^2 的模拟废水进行了吸附试验，同时比较了钠基土和有机土的吸附效果。进一步探讨了吸附时间及吸附液pH值对改性膨润土吸附Cr^6 的影响。     

Na-Al改性膨润土氨氮吸附材料的制备研究

采用部分钠化-铝化的方法对膨润土改性制备氨氮吸附材料,研究改性剂钠铝比、改性剂用量、改性时间等制备条件对改性膨润土氨氮吸附性能的影响,探究改性膨润土吸附氨氮机理。试验结果表明:优化改性条件为改性剂钠铝比5∶1,改性剂用量6%,改性时间2 h;对低浓度模拟氨氮废水,改性后膨润土矿物材料吸附氨氮量明显高于改性前原矿,制得的吸附材料对初始质量浓度为5 mg/L、100 m L实验室模拟氨氮废水的氨氮去除率达到79.03%;氨氮吸附方式为阳离子交换吸附,通过Na-Al改性提高了膨润土材料的阳离子交换容量,从而提高了膨润土吸附性能。     

KH550改性膨润土对低浓度U(VI）的吸附性能试验

铀造成的水体污染是目前亟需解决的环境问题,吸附法是一种效率高且有效的方法之一。针对膨润土吸附率不佳的问题,采用硅烷偶联剂KH550对膨润土进行改性,提高膨润土对水体中低浓度铀的吸附性能。采用SEM、FTIR、XRD、氮气吸附脱附对吸附材料进行表征,并利用该材料对水体中铀进行吸附试验。结果表明,膨润土采用KH550改性后,在pH为5、温度为338.15K、初始浓度为10mg/L、转速为165r/min、投加量为1.0g/L、反应时间大于50min的条件下,含铀废水中铀去除率大于95%。改性膨润土对铀的吸附符合拟二级动力学模型和Langmuir模型,其对铀的吸附为自由度减少,熵减的过程。该试验有望为含铀废水的处理提供一种新技术。     

膨润土对有机染料的吸附

采用分光光度法对膨润土以及改性膨润土吸附工业有机染料的能力进行了测定。膨润土以及改性膨润土对于不同的有机染料其吸附能力不同，染料色越深，越不易被吸附；经活化处理过的膨润土对染料具有更好的吸附脱色性能。     

钙基膨润土的组合改性及对垃圾渗滤液的处理

钙基膨润土的钠化改型工艺简单、实用性强 ;酸改性后的膨润土对于金属离子具有较强的吸附能力 ;有机改性后的膨润土对有机物具有较强的吸附能力 ;而“组合”改性后的膨润土 ,对金属离子和有机物都具有较强的吸附能力。利用“组合”改性后的膨润土作吸附剂 ,处理垃圾渗滤液 ,效果比较理想 ,CODCr的去除率可达 79%、重金属离子的去除率 5 3 %～ 98%、氨氮去除率达 46%。     

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

正~~     

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