Application of three Ln(Ⅲ)-coordination polymers in fields of luminescence,antibacteria and detection of Fe3+ and 4-nitrophenol

Three lanthanide-based coordination polymers(Ln-CPs) with layered structure,{[La₂(L)₃(DMF)(H₂O)₃]·H₂O}_n(1),{[Eu₂(L)₃(DMF)₂(H₂O)]·(H₂O)}_n(2){Tb₂(L)₃(DMF)₂(H₂O)]·H₂O}n(3) were successfully synthesized from H₂L(N,N’-bis(4-carbozylbenzyl)aniline).Remarkably,compound 3 has extremely high sensitivity to 4-n...     

稀贵萃余液高结晶臭葱石除砷研究

化学沉淀法处理含砷废水,产物沉砷渣通常不稳定,易导致砷泄露,对环境造成严重的危害。采用沉砷率高、固砷渣稳定的低温常压臭葱石(FeAsO₄·2H₂O)沉砷法进行除砷,并研究了初始pH、Fe/As摩尔比、Fe₂(SO₄)₃滴加速率对As、Fe去除率,FeAsO₄·2H₂O结晶度,形貌和浸出毒性的影响。结果表明：初始pH和Fe/As摩尔比的升高有利于沉砷率的提高,但会导致沉砷渣中FeAsO₄·2H₂O结晶度和含量下降。提高Fe₂(SO₄)₃滴加速率有利于反应效率,但不利于FeAsO₄·2H₂O的纯度。在初始pH为1.5,Fe/As摩尔比为1.5,Fe₂(SO₄)₃滴加速率为40 mL/h以及滴加时间为1.125 h的条件下,...     

Fenton法处理化学实验室有机废水

Fenton法具有氧化性强，操作便捷，反应迅速安全稳定等优点，对于高浓度有机废水有较好的实验效果。本文采用Fenton法对攀枝花学院化学实验室产生的有机废水进行处理，通过单因素实验，探讨了FeSO₄·7H₂O投加量、H₂O₂投加量、pH值、反应温度和反应时间等五个因素对有机废水COD去除率的影响。单因素实验结果表明：在pH值=3,H₂O₂投加量为2.0 mL/100mL,FeSO₄·7H₂O投加量为0.5 g/100mL,反应温度为50℃,反应时间为60 min, COD去除率达到最大为83%。在单因素的基础上，进行了正交实验，结果表明：四个影响因素对实验结果影响大小的顺序为：R2(pH)> R1(Fe²⁺/H₂O₂)>R4(反应时间)>R3(温度),四因素的最佳组合为：pH值=3,温度为50℃,Fe²⁺/H...     

铁酸锌中锌的绿色浸出同步除铁实验研究

以七水合硫酸亚铁(FeSO₄·7H₂O)为浸出剂,通过无酸氧压浸出工艺,实现铁酸锌(ZnFe₂O₄)中的锌的高效浸出和铁的同步分离。研究分析了FeSO₄·7H₂O与ZnFe₂O₄的质量比、反应温度、反应时间、氧分压对锌浸出和铁沉淀的影响。结果表明,在FeSO₄·7H₂O与ZnFe₂O₄质量比为10∶5,反应温度为180℃,氧分压为2 MPa,反应时间为3 h条件下,锌的浸出率可达87.65%,而铁以Fe₂O₃的形式存在浸出渣中,浸出液中铁的残留率仅为0.56%,实现了锌铁高效分离。该实验验证了FeSO₄·7H₂O浸出含锌粉尘中锌同步除铁的可行性,为利用FeSO₄·7H₂O对含锌电炉粉尘中锌的绿色提...     

MAP法和折点氯化法联合工艺处理印制线路板铜氨废水试验研究

在废印刷电路板回收利用时通常会产生大量含重金属离子的废水,一般含有[Cu（NH₃）₄]2+、NH₄+和NH₃·H₂O,这些铜氨络离子稳定性高,处理难度极高。文中以废印刷电路板在回收利用有价金属时产生的铜氨废水为研究对象,通过MAP法和折点氯化法联合工艺对该废水进行处理,有效回收了氨氮和铜。该联合工艺不仅可以有效地节约经济成本,并且回收的铜和氨氮产物也能产生一定的经济效益。结果表明:MAP反应的较优条件为pH=9.5,废水中氨氮与投入磷盐和镁盐的摩尔比为4:1:1.1,对氨氮的去除率为23%,铜的去除率为2%,形成了磷酸氨镁沉淀。折点氯化法的较优pH为9.5,N/Cl的摩尔比为1:1.6,氨氮处理效果为98.8%,铜去除率99.8%。      

燃烧法制备亚微米Co3+掺杂LaBO3粉体及表征

以La(NO₃)₃·6H₂O、Co(NO₃)₃·6H₂O、H₃BO₃和C₂H₅NO₂为原料，采用燃烧法合成Co³⁺掺杂LaBO₃粉体，其中原料摩尔比为[La(NO₃)₃·6H₂O+Co(NO₃)₃·6H₂O]:H₃BO₃:C₂H₅NO₂=3:3:5，研究了目标产物La₍(1-x))Co_xBO₃(x=0.01～0.04)在750～950℃的合成反应过程及产物结晶形态，分析了合成条件对产物晶体形态的影响，得...     

钐掺杂改性γ-Al2O3粉体的热稳定性研究

以硝酸铝(Al(NO₃)₃·9H₂O)为氧化剂，甘氨酸(C₂H₅NO₂)为还原剂，硝酸钐(Sm(NO₃)₃·6H₂O)为改性剂，通过溶液燃烧法合成了γ-Al₂O₃粉体。采用XRD、SEM、BET、TG-DTG等手段对产物进行表征，并分析探讨了焙烧温度、改性剂添加量对产物物相的影响。实验结果表明：在硝酸铝(Al(NO₃)₃·9H₂O)与甘氨酸(C₂H₅NO₂)的物质的量之比为3∶5,改性剂Sm(NO₃)₃·6H₂O添加量为1%,焙烧温度为1 025℃,焙烧时间为4 h的条件下可以制备具有较高热稳定性的γ-Al₂O₃     

微波水热法制备Co掺杂的LaFeO3及其光催化性能

以Co(NO₃)₂·6H₂O、Fe(NO₃)₃·9H₂O、La(NO₃)₃·H₂O为原料,柠檬酸为络合剂,葡萄糖为模版剂,采用微波水热的方法合成了钙钛矿结构LaFeO₃光催化剂.利用XRD、SEM、TG-DSC和FT-IR等手段进行分析表征.结果表明:Co的掺杂有利于提高LaFeO₃光催化剂的活性,其催化效果优于纯的LaFeO₃;当掺杂量x=0.1时,其催化效果较优,光照时间为150 min时,亚甲基蓝的降解率达到99.46 %,较纯LaFeO₃高出36.51 %.      

水热臭葱石固砷过程Na+和K+的影响

水热臭葱石沉砷体系中Na⁺、K⁺碱金属离子对沉砷渣物相组成影响显著,Fe(Ⅲ)与As(Ⅴ)共沉淀生成臭葱石(FeAsO₄·2H₂O)、次水合砷酸铁(FeAsO₄·0.75H₂O)砷铁共沉淀物,同时Fe(Ⅲ)还以黄钠铁矾(NaFe₃(SO₄)₂(OH)₆)、黄钾铁矾(KFe₃(SO₄)₂(OH)₆)、碱式硫酸铁(Fe(OH)SO₄)形态竞争析出,从而影响沉砷渣的稳定性。在Na₂SO₄-(K₂SO₄)-FeSO₄-H₃AsO₄-H₂O体系中研究了Na⁺、K⁺     

草酸-草酸钠浸出焙烧氰化尾渣中赤铁矿工艺的优化研究

为了获得H₂C₂O₄-Na₂C₂O₄浸出焙烧氰化尾渣中赤铁矿的工艺条件，在单因素试验结果的基础上，采用响应面法(RSM)优化其浸出工艺。结果表明：H₂C₂O₄-Na₂C₂O₄除铁优化条件为n(H₂C₂O₄)/n(Na₂C₂O₄)0.92、C₂O^2-₄过量倍数1.25、浸出温度95℃、液固比8∶1。各因素对除铁效果影响大小排序为浸出温度、液固比、n(H₂C₂O₄)/n(Na₂C₂O₄)、C₂     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.