Fenton试剂催化氧化法处理焦化废水的实验研究

以焦化废水为研究对象,采用Fenton(Fe2++H2O2)试剂催化氧化法对焦化废水进行强化一级处理实验。重点考察Fenton试剂在不同反应条件下,处理焦化废水的效果和反应的影响因素。设计了反应时间、pH值、试剂投加量、试剂配比、反应温度、投加方式等6种不同反应条件下CODCr和酚的去除实验。综合各反应条件试验结果表明:CODCr去除率为88.12%,酚去除率为89.45%,达到最佳实验处理效果。     

改性粉煤灰非均相Fenton法催化降解某选矿废水COD

广东某硫铁矿选矿废水COD偏高,达到220 mg/L,以酸改性粉煤灰作为催化剂,采用非均相Fenton氧化法处理该废水,实验结果表明,在pH值为4,改性粉煤灰投加量20 g/L,Fe2+投加量1. 57mmol/L,H2O2投加量9. 43 mmol/L,反应时间为40 min时,废水中COD的去除率可达92%以上,降解效果好。该法能够提高H2O2的利用率,且反应时间较短,是一种有效的选矿废水处理方法。     

Fenton氧化法处理高盐制药废水的研究

为了实现高盐制药废水的达标排放,采用Fenton氧化法对高盐制药废水出水进行深度处理,通过单因素实验与正交试验研究了废水初始p H值、H₂O₂投加量、硫酸亚铁投加量以及搅拌反应时间等因素对制药废水的处理效果。经试验确定最佳反应条件：p H值为3、H₂O₂(30%)投加量为5 m L、H₂O₂∶Fe²⁺为20∶1、反应时间为30 min。在最佳条件下,废水中COD的去除率达67.41%。经Fenton处理后的废水有机物种类与浓度均发生了变化,部分复杂有机物转化为较易分解有机物。     

煤化工污水膜处理浓缩液的回用技术研究

采用Fenton氧化法对煤化工污水深度处理系统中的膜滤浓缩液进行处理,考察了p H值、Fe2+含量和H2O2加入量等因素对降低膜滤浓缩液的色度、CODcr的效果,并与目前常用的臭氧氧化法进行了对比。实验确定了Fenton氧化法最佳工艺参数:p H=3.5,硫酸亚铁盐的加入量为20 mmol/L,H2O2的加入量为1.0 m L/100 m L。在此条件下,膜滤浓缩液CODcr的去除率约为67%,色度(铂—钴色号)降至5以下,比臭氧氧化法的处理效果好。结合深度处理系统,实现了对膜滤浓缩液的处理和回用。     

黄铜矿催化异相类Fenton反应处理染料废水研究

采用异相类Fenton反应处理染料废水,并以均相Fenton反应为对照,考察废水初始pH值、催化剂投加量、H₂O₂投加浓度和反应时间对处理效果的影响,测定了反应过程中铁离子和剩余H₂O₂浓度的变化情况。结果表明,对于试验用实际染料废水,均相Fenton反应适宜的pH范围为3~8,七水合硫酸亚铁投加量为2 g/L,H₂O₂投加浓度为20 mmol/L,反应时间为2 h时,COD去除率与色度去除率最高能达到59.39%和97.71%;异相类Fenton反应在废水初始pH=3时处理效果最佳,黄铜矿投加量为9 g/L,H₂O₂投加浓度为20 mmol/L,反应时间4 h时,COD去除率与色度去除率分别为56.03%和93.79%。均相和异相类Fenton反应处理染料废水过程中生成的·OH能降解有机污染物。     

硅藻土负载铁氧化物催化剂的制备及其对某选矿废水的降解试验

某硫铁矿选矿废水COD偏高,达220 mg/L,通过将铁氧化物负载于硅藻土上制成非均相Fenton法催化剂,用于对该废水进行氧化处理。试验结果表明:非均相Fenton法催化剂适宜的制备条件为Fe3+浓度0.03 mol/L,Na OH与Fe3+的物质的量之比3,焙烧温度150℃;新型硅藻土负载铁氧化物催化剂非均相Fenton法降解废水COD的工艺条件为废水初始p H=5,催化剂投加量为1.5 g/L,H2O2投加量为11.79 mmol/L,反应时间为60 min,废水的COD去除率达85.67%;以资源丰富、负载性能好的硅藻土为原料制备的非均相Fenton法催化剂,可高效、低成本降解选矿废水的COD,处理后的水质符合排放标准,具有工业应用价值。     

芬顿试剂处理煤矿矿井水中硫化氢技术

为了消除煤矿矿井下硫化氢所造成的安全隐患,使用芬顿试剂对矿井水中硫化氢进行了处理,主要考察了过氧化氢的投加量、FeSO4 ·7H2 O的投加量、pH值、反应时间、摇床转速及反应温度等对处理效果的影响,并讨论了Fenton试剂高级氧化技术除硫化氢的反应动力学。结果表明：Fenton试剂的最佳用量为0.67 g/L FeSO4 ·7H2 O+0.67 mL/L H2 O2 ,反应适应pH值为6~10,最适水流扰动强度为160 r/min的摇床转速,最佳反应温度25 ℃,最佳反应时间10 min。在最佳条件下,Fenton试剂处理初始浓度为140 mg/L的硫化氢水溶液时去除率达到93.14%,水中剩余硫化氢浓度仅为2.381 mg/L,有效防止了硫化氢的溢出。Fenton试剂处理水中硫化氢的过程可以用准二级动力学来描述。     

混凝-电Fenton法处理DDNP废水的试验研究

针对DDNP废水难于被微生物降解的特点,采用混凝-电Fenton法处理DDNP废水,先对DDNP废水进行混凝处理,然后将沉降后的上清液再用电Fenton法处理,考察各反应阶段COD和色度去除效果及影响因素。试验结果表明:混凝初始pH=10,混凝时间为3 h,聚铁投加量为20 mL/L时,COD和色度去除率分别为58.09%和41.67%;对于混凝沉降后的上清液,在电解时间为3 h,pH=6,H2O2(质量分数为30%)的投加量为14 mL/L,电解电压为14 V时,处理效果最好,最终COD和色度去除率分别为99.14%和99.94%。     

EF-Feox法预处理煤气洗冷废水中试研究

针对煤气发生站产生的煤气洗冷废水含有难以生物降解的酚类、芳香烃、氨氮等有毒有害物质,会对人和环境具有很大危害的问题,通过EF-Feox法处理实际煤气洗冷废水中试试验,分别研究了电流、p H及H2O2投加量等因素对去除效果的影响,并采用三因素三水平中心复合试验进行响应曲面设计,综合考虑经济因素及工程可行性确定最佳工艺条件。结果表明:在p H为4.0、H2O2投加量为3.0 m L/L、电流为0.6 A,电解质Na Cl浓度为17 mmol/L、极板间距为100 mm、水力停留时间3 h条件时,废水中酚类的去除率可达92.82%;CODcr去除率不高,但可生化性(B/C)可由最初的0.09提高至0.44,适合作为生化处理的预处理。     

粒子电极对印染废水的电催化降解性研究

利用自制不锈钢基PbO2电极与粒子电极组成三维电极处理直接绿模拟废水,研究粒子电极的电催化性能。考察了槽电压、电催化时间、电解质浓度、粒子电极投加量及粒子电极的回收利用次数等因素对直接绿模拟废水色度去除率的影响,确定较佳反应条件。对比分析铁尾矿和粉煤灰两种粒子电极的电催化性能。结果表明:槽电压6v,电催化时间4min,粒子电极投加量13g/L,电解质浓度为0.06g/L,对50mg/L直接绿废水的去除率最高可达97.98%。铁尾矿的电催化性能较粉煤灰好,但是回收利用率较粉煤灰低。     

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。