钢渣吸附去除藏蓝色和紫红色染料废水研究

采用搅拌吸附方式，对钢渣吸附去除藏蓝色和紫红色2种实际染料废水进行了研究。研究结果表明，钢渣对藏蓝色和紫红色印染废水脱色率受钢渣用量的影响较为显著，钢渣用量越大，脱色率越高，且呈线性递增趋势，线性相关系数良好（R²>0.96）；钢渣对藏蓝色印染废水脱色率在pH值为4.84~10.85时，基本不受影响，但pH值为12.40时，脱色率大幅下降，脱色率仅为41.41%，相对色度高达1 403.40°；钢渣对紫红色印染废水的吸附具有良好的pH值适应性，基本不受废水pH值影响。钢渣吸附去除藏蓝色和紫红色2种染料废水脱色率可达94.70%和96.16%，COD去除率可达91.48%和95.63%。     

硅藻土负载壳聚糖季铵盐处理甲基橙染料废水

利用硅藻土负载壳聚糖季铵盐处理甲基橙染料废水,考察了季铵盐取代度、添加量、温度、甲基橙初始浓度、pH值和作用时间对甲基橙脱色率的影响.结果表明,壳聚糖季铵盐的季铵化取代度为55.6％时,硅藻土/HACC2对甲基橙的脱色效果最好.当pH值为2.6,20℃下搅拌90 min,硅藻土负载壳聚糖季铵盐添加量为350 mg时,对50 mL质量浓度为0.05 mg/mL的甲基橙染料去除率达95.3％.     

有机改性膨润土处理含油废水

用溴化十六烷基三甲铵对膨润土进行改性。改性后的膨润土可以较好的吸附含油废水中的油,其中用5%CTMAB改性的有机膨润土对含油废水的处理效果最好。在土用量为0.75g/50mL,搅拌时间为90min,搅拌速度为150r/min,废水的pH值为6,反应温度为35℃的条件下可达到较佳的处理效果,处理后水中废油的含量已低于国家     

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℃...     

粒化复合膨润土协同表面活性剂脱除水中酸性靛蓝

利用自主研制的粒化复合膨润土协同表面活性剂十六烷基三甲基氯化铵对模拟酸性靛蓝废水进行脱色处理,主要考察了粒化复合膨润土及表面活性剂投加量、振荡时间、pH值、温度、溶液初始浓度等对脱色效果的影响及粒化复合膨润土的再生利用效果,并根据试验现象分析了粒化复合膨润土在脱色过程中所起的作用。结果表明：溶液的初始浓度和pH值对脱色效果的影响不大而温度的影响较大;在合适的条件下,模拟废水的脱色率可达100%;粒化复合膨润土在脱色过程中的作用主要是使十六烷基三甲基氯化铵在原有脱色能力基础上又形成对酸性靛蓝较强的絮凝能力,从而显著改善脱色效果;粒化复合膨润土易于再生,反复使用次数可达4次。根据试验结果可知,采用粒化复合膨润土协同表面活性剂对印染废水进行脱色处理,不仅可获得优良的处理效果,还具有固液分离容易、表面活性剂用量少、二次污染风险低、粒化复合膨润土再生性能好等特点。     

聚羟基铁-壳聚糖改性膨润土处理缫丝废水的研究

以广西宁明膨润土为原料,壳聚糖和聚羟基铁离子为改性剂,制备了聚羟基铁-壳聚糖改性膨润土并应用于缫丝废水的处理,考察了缫丝废水CODCr去除率的影响因素。结果表明:在温度为25℃,废水pH值为6.3,改性膨润土投加量为0.85 g/L,快速搅拌速度为300 r/min、搅拌时间为1 min;慢速搅拌速度为80 r/min,搅拌时间为10 min,沉降时间为15 min的条件下,聚羟基铁-壳聚糖改性膨润土对缫丝废水CODCr的去除率可达90.56%。与钠化膨润土相比,聚羟基铁-壳聚糖改性膨润土对缫丝废水的处理能力显著提高。     

CPAM复配膨润土处理刚果红废水的研究

利用阳离子聚丙烯酰胺（CPAM）与膨润土复配制备复合絮凝剂,对刚果红废水进行处理,研究了絮凝剂制备配比、投加量、搅拌时间及pH值对脱色率的影响。结果表明,最佳制备配比为0.3,投加量为4 g/L,搅拌时间为15 min,pH值为7。在最佳条件下,废水脱色率达84.9%。膨润土的红外光谱和XRD结果表明,CPAM对膨润土具有改性作用,但没有改变膨润土原有结构,只是负载在其表面。     

聚合双酸铝铁对印染废水的混凝效果研究

厦门华纶印染厂印染废水是一种COD、色度和浊度都较高的生产废水。选用聚合双酸铝铁作为混凝剂对该废水进行处理,主要研究搅拌速度、搅拌时间、pH值、投药量和沉降时间对聚合双酸铝铁混凝效果的影响,由此确定其最佳工艺参数。并将聚合双酸铝铁与硫酸铝、硫酸铁和聚合氯化铝进行混凝效果比较。研究结果表明,聚合双酸铝铁处理印染废水的最佳搅拌速度、搅拌时间、pH值、混凝剂投加量、沉降时间分别为350 r/min、1 min、8.0、5.0 g/L、20 min。通过聚合双酸铝铁与硫酸铝、硫酸铁和聚合氯化铝的混凝效果比较,发现聚合双酸铝铁对印染废水的处理效果最好。     

低品质高岭土吸附亚甲基蓝试验研究

以三级高岭土为原料,采用单因素法分析高岭土用量、温度、亚甲基蓝浓度、脱色时间及pH值对高岭土脱色性能的影响。在温度25℃亚甲基蓝初始浓度20 mg/L、高岭土用量0.08 g、pH值为8、吸附时间80 min实验条件下发现高岭土对亚甲基蓝的脱色率为69.45%,效果一般;采用盐酸对三级高岭土直接改性处理,利用红外光谱表征改性前后高岭土变化。实验结果表明:在相同脱色条件下盐酸改性高岭土的脱色率达86.43%,脱色率提高16.98%,改性后的高岭土脱色效果较好。     

CTMAB改性膨润土对活性艳蓝的吸附性能

采用碳酸钠-十六烷基三甲基溴化铵(CTMAB)复合法对天然膨润土进行改性,并通过红外光谱和X射线衍射分析手段对所制备的CTMAB改性膨润土进行了结构表征。以CTMAB改性膨润土为吸附剂对模拟活性艳蓝染料废水进行吸附脱色试验,结果表明:改性膨润土的脱色效果大大优于原土。在废水活性艳蓝浓度为50mg/L,pH=7,改性膨润土用量为5.0 g/L,吸附时间为50 min的条件下,模拟废水的脱色率达91.98%。     

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     

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。     

2014 second batch of rare earth quota released

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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