201×7树脂负载Fe（CN）6^3-的解吸

文中对201×7强碱性离子交换树脂负载的铁氰化物进行了解吸研究,以解决酸洗脱树脂过程中出现的问题。采用水合肼和氯化钠混合溶液可有效解吸树脂上负载的铁氰化物;在室温条件下,解吸溶液为2％水合肼＋100g／L氯化钠时,三价铁解吸率可以达到98％以上。在试验条件下,测得解吸速率常数矗：8．88×10^-4／s,60min基本达到解吸平衡。随着温度的升高,解吸速率逐渐增大,表明解吸过程是一个吸热过程,升温有利于解吸进行,但解吸过程的表观活化能为0．625kJ／mol,表明反应速率对温度不是很敏感,解吸过程可以在室温下进行。     

酸洗后201×7树脂上金属铜的解吸研究

针对硫酸溶液可以有效洗脱树脂上的氰化物和锌,但不能洗脱铜的工艺问题,选择氨水溶液对酸洗后201×7树脂上的铜进行解吸;试验研究了解吸过程的时间、温度以及超声波作用等条件对解吸率的影响,并进行了X射线荧光分析。试验结果表明,在25℃时,8%的氨水溶液可以有效解吸酸洗后201×7树脂上负载的铜,解吸率可以达到85%,解吸速率常数k=4.93×10-4/s,解吸过程的表观活化能为12.058kJ/mol。     

201×7树脂吸附回收提金尾液中的氰化物及金属铜

研究了201×7树脂吸附回收提金尾液中氰化物及金属铜的技术。通过对树脂的饱和吸附量、吸附速率及吸附等温线的研究,得到了201×7树脂对氰化物的饱和吸附量为44.39mg/ml湿树脂,铜的饱和吸附量为24.56mg/ml湿树脂;氰化物的吸附速率常数为k=9.30×10-4s-1,铜的吸附速率常数为k=1.39×10-3s-1;该树脂对氰化物及铜离子的吸附符合Freundlish方程;使用高浓度的NaCl溶液可以解吸树脂上负载的氰化物及金属铜,解吸率分别为85%和72%。     

用柠檬酸解吸镓的试验研究

离子交换法回收金属镓时一般采用硫化钠作解吸剂,但硫化钠解吸率较低,只有60%左右,且对环境有一定影响.试验研究了用无毒无害的柠檬酸从负载树脂上解吸金属镓.考察了柠檬酸质量浓度、解吸时间、解吸温度对镓解吸率的影响,并与硫化钠溶液解吸结果进行比较.结果表明,对于饱和树脂,用100 g/L柠檬酸,在室温下解吸2 h,镓解吸反应达到平衡,解吸后的贫树脂可返回使用.     

201×7强碱性阴离子交换树脂对氰化物的吸附性能及吸附机理

通过试验选择了201×7强碱性阴离子交换树脂吸附氰化物,确定了该树脂对氰化物的静态饱和吸附量为25.39mg/mL湿树脂,动态饱和吸附量为27.43mg/mL湿树脂。在研究解吸的过程中,选择中性NaCl溶液作为解吸剂,取得了良好的解吸效果。通过动态试验,研究了氰化物质量浓度、流速等因素对树脂吸附性能的影响,以及NaCl溶液流速对淋洗效果的影响。研究探讨了该树脂吸附氰化物的机理,结果表明,氰化物在201×7树脂上的吸附机理主要是CN-与树脂的季胺基团形成氢键吸附和范德华引力吸附。201×7树脂对氰化物的吸附性能较好,在处理、回收提金废水氰化物中,具有工业应用前景。     

D261大孔树脂吸附氰化物的性能及机理研究

研究了D261大孔树脂对氰化物的吸附性能及机理,考察了酸度、温度、溶液中氰化物质量浓度、时间及树脂用量对氰化物吸附的影响。试验结果表明,D261大孔树脂能有效地吸附简单氰化物和金、银、铜、锌、铁的氰络合物。热力学试验表明,吸附等温线符合Freundlich方程,吸附过程属于优惠吸附。动力学研究表明,吸附在室温下是瞬时反应,静态吸附过程主控步骤为Boyd液膜扩散,吸附的本质为物理吸附。同时,确定D261树脂的静态饱和吸附量为25.28mg/mL湿树脂。     

用强酸性阳离子交换树脂从不锈钢酸洗废水中富集铬

研究了用强酸性阳离子交换树脂(001×7)吸附不锈钢酸洗废水中的铬,考察了树脂的饱和吸附容量、吸附时间对树脂吸附铬的影响,分析了等温吸附平衡及负载树脂的解吸再生。结果表明:298 K温度下,001×7树脂对废水中Cr3+的饱和吸附容量为60.34 mg/g;吸附90 min可达离子交换平衡;废水中铬质量浓度为700mg/L时,树脂的平衡吸附量为90 mg/g;根据吸附动力学,初步判定吸附过程为液膜控制;用质量浓度为9g/L的硫酸钠溶液可以从负载树脂上解吸铬,铬解吸率达99%以上,解吸后的树脂可重复使用。     

用离子交换树脂从拜耳法种分母液中吸附钼的研究

研究了多种离子交换树脂在强碱性条件下从拜耳法种分母液中吸附钼的性能。结果表明,1#树脂的吸附性能最好,理想条件下的工作吸附容量为10 g/L(湿树脂)以上;负载树脂用C溶液解吸,可以得到钼质量浓度8~10 g/L的解吸液,钼解吸率在72.3%以上。另外,也考察了溶液的运行方式、树脂重复使用效果等。     

碱性溶液低浓度镓的回收

某氧化铝厂赤泥除含大量的Fe_2O_3、Al_2O_3和Na_2O外,其Ga_2O_3含量高达96.25mg/kg。采用电解废旧阴极高温还原赤泥分离铁、铝、钠的过程中,除获得铝和钠的高效回收外,Ga_2O_3浸出率高达90.41%,浸出液中Ga_2O_3的浓度为7.19mg/L,具有回收价值。采用树脂离子交换工艺对还原性烧结熟料浸出液中的镓进行富集回收,结果表明,最适宜镓吸附条件为:LSC-700树脂用量0.6g/L、温度(50±0.5)℃、接触时间24h、振荡速率120r/min,镓吸附效率为52.13%;对镓负载树脂采用酸法解吸,镓的平均解吸率为92.29%,解吸溶液含镓平均86.43mg/L,比初次浸出溶液(7.19mg/L)和二次循环浸出溶液(21.62mg/L)分别富集了12倍和4倍。     

含氰尾液综合回收研究

研究了一种利用离子交换法综合回收提金尾液中氰化物的新技术与新方法,主要对新方法中的树脂吸附、解吸过程的影响因素及过程热力学、动力学参数进行系统实验研究,确定了完整的工艺流程。研究表明,该技术可以有效经济地回收提金尾液中的氰化物,树脂吸附和解吸的速率常数分别为1.01×10-2s-1和2.12×10-2s-1,常温下吸附过程的ΔG=-4.88kJ.mol-1,并符合Freundlish经验等温式。树脂对氰化物的饱和吸附容量为25.39mg.ml-1湿树脂,对尾液中氰化物的吸附率达到90%以上,解吸率达85%以上,同时可以分离回收尾液中的有价金属。对黄金洁净生产与循环经济具有重要的实用价值。     

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.