改性硅藻土对废水中Pb2+、Cu2+、Zn2+吸附性能的研究

利用天然硅藻土为原料制备出改性硅藻土。在静态条件下．研究了改性硅藻土对重金属离子Pb^2 、Cu^2 、Zn^2 的吸附效果及条件．同时探讨了改性硅藻土对Pb^2 、Cu^2 、Zn^2 的解吸再生条件。含Pb^2 、Cu^2 、Zn^2 的电镀废水经改性硅藻土吸附后，废水中Pb^2 、Cu^2 、Zn^2 的含量低于国家排放标准。     

矿山含铜重金属废水微生物处理试验研究

自矿区环境中筛选并培养出了嗜水气单胞菌,对配置的模拟含Cu^2 废水和实际矿山含铜酸性废水采用嗜水气单胞菌进行了试验研究,同时探讨了吸附机理。结果表明,影响该菌体吸附Cu^2 的主要因素有溶液pH值、预处理方式、吸附时间以及共存离子、菌体浓度等;在一定条件下,该菌体能有效吸附Cu^2 ,实际矿山含Cu^2 废水经二次吸附可达标排放。机理分析表明,菌体中的NH2和C=O是微生物菌体吸附Cu^2 的主要基团。     

涌泉膨润土吸附废水中Cu2+、Zn2+、Cr3+的试验研究

用山东潍坊涌泉某膨润土厂生产的膨润土对模拟含Cu^2＋、Zn^2＋、Cr^3＋的废水进行了试验研究。结果表明，该膨润土对废水中的Cu^2＋、Zn^2＋、Cr^3＋有较高的去除率。并且吸附速度快、时间短，可作为废水中重金属Cu^2＋、Zn^2＋、Cr^3＋的吸附剂使用。吸附后的膨润土，可用作抗菌材料的添加剂。     

天然及改性膨润土对重金属废水处理效果的试验研究

研究了膨润土及改性膨润土对水中Pb^2＋、Cu^2＋的吸附作用，改性膨润土的吸附效果明显优于天然膨润土。废水在吸附温度为30℃，pH为6，Pb^2＋、Cu^2＋的初始浓度25mg／L，吸附剂的用量为15g／1，吸附时间45min的条件下，改性膨润土对Pb^2＋、Cu^2＋去除率分别达到97．3％和98．2％，吸附后Ph^2＋、Cu^2＋残留浓度低于国家规定的排放标准。     

提纯硅藻土对废水中磷的吸附研究

通过提纯后的硅藻土对模拟废水中磷素的吸附研究,考察了硅藻土的用量、吸附时间、溶液pH值、吸附温度对吸附过程的影响。研究结果表明:硅藻土的最佳用量为3.5g硅藻土/0.1mg磷左右;最佳震荡吸附时间为20min左右;溶液的最佳pH值为3.0左右,且随着pH值的增大吸附率减小,特别在溶液呈碱性的时候吸附效果明显变差;最佳吸附温度约为25℃;硅藻土对废水中磷素的吸附过程符合Freundlich等温吸附方程。     

有机改性硅藻土去除水中亚甲基蓝和孔雀石绿染料的试验研究

主要研究了阴离子表面活性剂十二烷基硫酸钠(SDS)改性硅藻土对亚甲基蓝和孔雀石绿染料废水的吸附处理.考察了pH值、温度、时间和投加量4个因素对有机改性硅藻土处理染料废水效果的影响.研究结果表明:当pH值为8,吸附温度为25℃、吸附时间为20min时,改性硅藻土对亚甲基蓝的处理效果最好,脱色率为71%;当吸附温度为25℃...     

泥煤对稀土元素铈、镝、铕的吸附性能研究

在静态条件下，研究了泥煤对稀土金属离子Ce^4＋、Dy^3＋和Eu^2＋的吸附特性。结果表明，泥煤对稀土金属离子有较强的吸附性能，pH是影响吸附的主要因素，吸附过程符合动力学一级方程，吸附平衡数据符合Freundlich、Langmuir及DR模型。吸附过程自发不可逆，且放出热量，提高温度对吸附不利。泥煤对三种元素的平衡吸附量不同，讨论了泥煤用于处理稀土元素废水的可行性。     

硅藻土对重金属离子Cu2+的吸附性能研究

研究了提纯硅藻土对Cu2+的吸附影响因素,并对吸附机理进行了初步探讨。试验结果表明:在一定范围内,增加硅藻土用量、延长吸附作用时间、升高吸附温度、提高pH值均可改善对Cu2+的吸附去除效果,其中pH值是最重要的影响因素。硅藻土对Cu2+的等温吸附符合Langmuir方程。     

钠基蒙脱石对水溶液中Cu2+的吸附作用研究

研究了钠基蒙脱石对水溶液中Cu^2 的吸附性能。考察了各种反应条件，如离子浓度、反应时间、磁场强度以及pH值对钠基蒙脱石吸附Cu^2 量的影响。结果表明：水溶液中Cu^2 初始浓度以0．1mol/L以下为宜，pH值应控制在3-5范围内，较佳的反应时间为50min；在磁场中磁场强度提高能促进钠基蒙脱石对水溶液中Cu^2 的吸附。     

凹凸棒石黏土对Cd2+的吸附作用及影响因素

通过室内吸附实验，表明凹凸棒石黏土（凹土）对重金属离子Cd^2＋有很好的吸附作用，吸附作用受溶液pH值影响明显。增大镉离子初始浓度，有利于提高凹土对Cd^2＋吸附量，但是去除率降低。支持电解质对凹土吸附Cd^2＋也产生影响，Ca^2＋的影响比Na^＋和K^＋的大。     

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。