合金渣中铪的MIBK萃取分离试验

采用MIBK作为萃取剂,在盐酸体系下,对含铪合金渣中的铪进行萃取分离试验,主要考察合金渣中含量较高的锆、钛、铬和铪在萃前液不同氢离子浓度、NH4SCN浓度、有机相HSCN浓度及相比下的分离性能。结果表明,铪和锆钛分离难度较大、和铬分离较易,铪的最优分离条件为:萃前液氢离子浓度0.96mol/L、萃前液NH4SCN浓度2.56mol/L、有机相HSCN浓度2.73 mol/L、相比1。在最优条件下,铪和锆的相对分离系数为6.63,铪的分配比为1.79,对于锆含量较低的合金渣,可以有效提升锆铪分离效率,钛最好于萃取分离前进行分离。     

富集渣中铪的TBP萃取分离研究

以铪钛富集渣为原料,经硝酸溶解后采用TBP进行铪的萃取分离试验,主要考察铪钛质量浓度、有机相初始酸度、萃取时间、水相初始酸度、相比等对铪钛分离的影响,同时进行了不同浓度硝酸洗涤试验,以萃取和洗涤得到数据为基础进行了分馏萃取理论级数的计算。结果表明,最优萃取条件为:铪钛总质量浓度2.8g/L、有机相初始酸度3.1mol/L、萃取时间6min、水相初始酸度6.5mol/L、相比1∶1,铪、钛萃取率分别为84.8%和5.1%,铪、钛分配比分别为5.6和0.054,萃取分离系数β_(Hf/Ti)=104。选用10mol/L硝酸洗涤TBP载铪有机相,得到洗涤β_(Hf/Ti)=105,基本与β_(Hf/Ti)保持一致,经计算分馏萃取分离铪钛需要萃取级数3级,洗涤级数4级。     

MIBK-HSCN体系萃取分离锆铪影响因素的研究

采用甲基异丁基酮(MIBK)作萃取剂,以氧氯化锆(铪)为原料,研究了MIBK-HSCN体系中H 和(NH4)2SO4的浓度对锆铪萃取分离的影响。结果表明:锆铪分离最佳水相酸度是1～1.5mol·L-1,此时铪的分配系数大于1,分离系数为3～4,溶液无沉淀出现;料液中添加(NH4)2SO4可显著提高铪的分配系数及分离系数,添加(NH4)2SO4的最佳浓度是0.8～1mol·L-1,此时铪的分配系数为2.5,分离系数为10～14,溶液无沉淀出现。     

料液中添加NH_4Cl对Sm~(3+)和Zn~(2+)萃取性能的影响

采用1.5 mol/L P507-煤油为有机相,以SmCl_3和ZnCl_2的混合溶液作为料液,改变料液中添加NH4Cl浓度、料液酸度、Zn~(2+)浓度、有机皂化度、相比、混合时间,进行了Sm~(3+)和Zn~(2+)的萃取分离研究。结果表明,萃取分离Sm~(3+)和Zn~(2+)最佳的工艺参数为,有机皂化度为0.54 mol/L、料液中添加3 mol/L的NH_4Cl、料液酸度为0.15 mol/L、萃取相比O/A为2.5∶1以上,混合时间为4 min,Sm~(3+)和Zn~(2+)的最大分离因素βSm/Zn达到39.31。     

DIBK溶剂萃取法分离锆铪

以二异丁基甲酮(DIBK)作萃取剂,以TBP或P204作改质剂,从不同酸性介质中萃取分离锆铪。考察酸性介质、TBP加入量、P204加入量和盐析剂(NH4)2SO4等对萃取分离锆铪效果的影响。结果表明:DIBK只有在HSCN介质中优先萃取铪,改质剂TBP或P204的加入能显著增加铪的萃取率和锆铪的分离系数。锆铪的分离系数可达到9,与MIBK萃取分离锆铪的性能相似。     

N236-HSCN体系萃取分离锆铪的盐效应研究

以乙酸戊酯作为稀释剂,采用N263-HSCN体系对锆、铪进行萃取分离,分别研究了(NH4)2SO4、NH4Cl、NH4NO3、NaCl和MgCl2等盐析剂的种类和浓度对锆与铪萃取分离的影响。结果表明,N263-HSCN体系分离锆、铪时优先萃取铪,该体系中SCN-的稳定性要比MIBK-HSCN体系强。不同阳离子的盐析剂对锆和铪的萃取率影响顺序为：NaCl>MgCl2>NH4Cl,对分离系数影响不大。不同阴离子的盐析剂对锆的萃取率顺序为：NH4NO3>NH4Cl>(NH4)2SO4,铪的萃取率顺序为：(NH4)2SO4>NH4Cl>NH4NO3,而分离系数顺序为：(NH4)2SO4>NH4Cl>NH4NO3,与阴离子的水合能力强弱顺序一致。当(NH4)2SO4加入量为0.6 mol/L时,分离系数达18.56,此时对锆和铪的萃取率分别为41.72%和93%。     

锌与钐的萃取分离工艺研究

采用1.5 mol/L P507-煤油为有机相,以氯化钐和氯化锌的混合溶液作为料液,研究了料液酸度、Zn2+浓度、有机皂化度、相比、混合时间等对Sm3+和Zn2+萃取分离的影响,得到了萃取分离Sm3+和Zn2+的最佳工艺参数:有机皂化度为0.54 mol/L,料液酸度为0.15 mol/L,萃取相比(O/A)为3:1,混合时间为4 min以上。Sm3+和Zn2+的分离因素βSm/Zn达到12。     

富集渣中钽的回收提纯研究

以钽富集渣为原料,进行了浸出及萃取试验研究。结果表明:采用65%HF浸出、温度60℃、时间1h、液固比4∶1,钽浸出率大于99%;选用MIBK-HF-H2SO4萃取体系,在钽质量浓度25g/L、温度25℃、萃取时间3min,H2SO4浓度2.5mol/L、相比O/A=1/2时,钽、铪、钛、钨萃取率分别为86%、1.6%、0.2%和5.8%,可实现钽与铪、钛、钨等金属离子的萃取分离。     

DIBK-P350和DIBK-TOPO负载有机相中铪和锆的反萃

分别以盐酸、硫酸、碳酸氢铵、碳酸铵和碳酸钾的水溶液为反萃剂,对比研究了其对DIBK-P350体系和DIBK-TOPO体系负载有机相中铪和锆的反萃性能。结果表明,盐酸、硫酸、碳酸氢铵和碳酸钾对这两个体系负载有机相中铪和锆的反萃率或分离系数较低,不适合作为该体系的反萃剂,而碳酸铵((NH_4)_2CO_3)较适合作为反萃剂。在室温、油水相比O/A=1/2、(NH_4)_2CO_3浓度1.5~2.0mol/L的优化条件下,DIBK-P350体系负载有机相中(NH_4)_2CO_3对铪的单级反萃率和锆铪的分离系数分别达到91.61%和6.94。对DIBK-TOPO体系负载有机相反萃的优化条件为:室温、油水相比O/A=1/2、(NH_4)_2CO_3浓度2.0 mol/L,(NH_4)_2CO_3对铪的单级反萃率和锆铪的分离系数分别达94.33%和15.30。     

P507萃取锆和铪及分离性能

以氯氧化锆(铪)溶液为料液, 用2-乙基己基膦酸单2-乙基己基酯(P507)萃取剂在盐酸介质中萃取锆铪.研究了P507浓度、料液浓度、萃取温度和时间、盐酸或氯离子浓度、添加剂浓度等因素对锆铪萃取率、分配比和分离系数的影响.结果表明: P507萃取锆铪的反应为吸热反应; 萃取速率较慢, 平衡时间≥40 min, 改变金属离子和萃取剂浓度, 以及在有机相中添加仲辛醇等均难以使萃取速率得到有效提高; 饱和法测得有机相中萃取剂与金属离子的物质的量之比为3左右; 锆、铪的分配比随着P507浓度的增加而增加, 但增加的幅度在低浓度区域和高浓度区域各不相同.锆铪之间的分离系数在萃取剂浓度0.9 mol·L-1附近呈极小值; 盐酸和氯离子浓度的影响较复杂, 呈波浪式变化.     

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.