酸和微波改性沸石对锌离子的吸附及动力学研究

利用微波辐射技术和HCl对天然沸石进行改性,在单因素试验的基础上对改性条件进行了优化,得出沸石改性的较优试验条件为:HCl改性液浓度为1.5 mol/L、微波功率640W、微波辐射时间6 min。研究了改性沸石对废水中Zn2+的吸附性能、影响因素及动力学过程,结果表明:当废水p H=7.0、常温、吸附时间为75 min、改性沸石用量为10 g/L时,对质量浓度为50 mg/L的Zn2+的去除率达98.52%。Langmuir吸附模型能较好地模拟改性沸石对Zn2+的吸附过程,吸附动力学方程以准二级动力学方程的拟合效果最优。     

沸石负载稀土元素镧吸附处理含镉废水试验

以稀硫酸和稀土元素镧离子改性天然沸石,制得改性稀土沸石。采用正交试验研究改性稀土沸石吸附处理模拟含镉废水,结果表明:在改性稀土沸石投加量为1.3g/L、p H值为6、吸附时间100min和反应温度20℃条件下,浓度为50mg/L模拟含镉废水中镉的去除率可达98%以上。     

酸碱改性沸石处理低浓度含Cd~(2+)废水的研究

沸石作为一种水处理材料,具有吸附、离子交换与催化性能,可作为控制环境污染的经济、高效和环境友好的材料。本文探讨了利用改性沸石处理低浓度含Cd2+废水的影响因素,主要包括处理时间、改性沸石用量、p H值、废水浓度和温度。试验结果表明,用0.5mol/L Na OH改性的沸石1.0g处理100.0m L Cd2+质量浓度为10.93mg/L的废水50min,最高去除率达到99.20%,此时Cd2+剩余浓度为0.09mg/L,处理效果达到污水综合排放质量浓度(≤0.1mg/L)要求。废水浓度和温度对处理效果的影响不是很大。     

碱和微波改性沸石及对亚铁离子的吸附研究

采用微波辐射技术和NaOH对天然沸石进行活化改性处理,研究了改性沸石对水溶液中Fe2+的吸附性能及影响因素。结果表明:经浓度为0.8 mol/L的NaOH和微波功率480W辐射5 min改性的沸石吸附性能良好,在溶液pH值为7及常温条件下,改性沸石在用量为10 g/L、振荡吸附时间为40 min时,对质量浓度为224 mg/L的Fe2+的去除率为99.5%。改性沸石对Fe2+的吸附规律较好地符合Langmuir吸附等温式。采用0.8 mol/L的NaOH作为改性沸石的再生剂,可使其再生重复使用。     

改性沸石制备及除磷性能研究

采用硫酸、高分子絮凝剂聚二甲基二烯丙基氯化铵(PDMDAAC)和阳离子型聚季铵盐对沸石进行改性,考察了改性沸石投量、pH值、吸附时间对处理效果的影响。结果表明:改性沸石用量为6g/L、pH值为7、吸附时间100min、反应温度为20℃,废水中磷的去除率可达98%以上。     

改性沸石吸附处理氨氮废水试验研究

在静态条件下研究了改性沸石对氨氮的吸附特性,考察了不同条件下改性沸石对含氨氮废水的处理能力.结果表明:热改性温度为500℃、pH值为7、改性沸石加入量为30g/L、吸附时间120min条件下,改性沸石对氨氮的去除率可达95％以上.     

改性沸石处理氨氮废水的试验研究

为了提高人造沸石的吸附能力,本文分别采用HCl、Na OH、KCl对沸石进行改性处理。试验结果表明:用5%的氯化钾改性过的沸石对氨氮的吸附效果较好。试验探讨了反应时间、沸石投加量、p H值、氨氮废水浓度和温度对氨氮吸附效果的影响。试验表明,当改性沸石投加量为3.0g、氨氮废水p H值=4~7、搅拌时间为80min时,对100m L质量浓度为77.5mg/L的氨氮废水的吸附率较高,出水达到GB8978-1996《污水综合排放标准》的二级标准。     

沸石吸附7-ACA废水中CODCr和NH3-N的试验研究

以抗生素原料中间体( 7-ACA)废水为研究对象,天然沸石及改性沸石为吸附材料,考察了废水初始pH值、沸石粒径、沸石投加量、吸附时间及沸石酸、碱、盐改性对废水中CODCr和NH3-N去除效果的影响.单因素实验结果表明,天然沸石处理废水的适宜条件为:废水初始pH值7.5,沸石投加量20g/L,沸石粒径1～2 mm,吸附时间150min.此条件下天然沸石对废水中CODCr和NH3-N去除率分别为35.3％和23.0％.盐酸改性沸石对废水中CODCr和NH3-N去除效果明显优于氢氧化钠改性沸石和氯化钠改性沸石.1 mol/L盐酸改性沸石投加量为15g/L,对废水中CODCr和NH3-N去除率均大于改性前,分别为48.4％和40％.     

改性高硫煤矸石处理含镍废水的实验研究

将高硫煤矸石与铁粉混合在一起加热改性,改性样品按照设定的条件处理含镍废水.实验结果表明:改性高硫煤矸石中的FeS与Ni2 发生沉淀转化反应,生成更难溶的NiS,使得含镍废水得以被处理;高硫煤矸石改性配比、加热时间以及废水的pH值、粒度、反应时间等均对Ni2 的去除率有重要影响.最佳反应条件为:pH值为7,改性配比100:10,粒度小于0.08mm,加热时间10min,加入量0.2000g,此时Ni2 的去除率接近100%.由于反应后废水的pH值为7,因此,处理后的尾液可以直接排放.     

微波有机改性膨润土处理含磷废水工艺优化研究

在单因素实验的基础上,以反应时间、微波有机改性膨润土投加量及溶液p H值为考察因素,以总磷去除率为评价指标,采用BoxBehnken响应曲面法(RSM)优化微波有机改性膨润土除磷的工艺条件,并得出相应的数学模型。实验表明,3个影响因子对总磷去除率影响的显著性大小表现为:微波有机改性膨润土投加量溶液p H值反应时间,且其影响均达到极显著水平;微波有机改性膨润土投加量和溶液p H值的交互作用对总磷去除率有显著影响。回归模型决定系数R2为0.9971,P0.0001,模型拟合程度好且模型显著。微波有机改性膨润土处理50 m L总磷质量浓度为50 mg/L废水的最佳实验条件为:反应时间11.1 min,微波有机改性膨润土投加量0.48 g,溶液p H值6.2。回归模型的预测值(99.77%)与3次实测平均值(98.65%)的相对误差仅为1.12%,说明模型对实验结果具有良好的预测效果。     

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。