1%La掺杂膨润土/纳米TiO_2材料处理氰化贫液性能研究

研究了用1%La掺杂膨润土/纳米TiO_2材料处理氰化贫液,考察了吸附时间、光催化时间、溶液pH、溶液温度对处理效果的影响。结果表明:在吸附时间2h、光催化2h、溶液pH为10左右、溶液温度25℃条件下,铜、锌吸附率分别达80%和65%,CN-分解率达45%。氰根催化机制表明,在高压汞灯光源照射下,氰化贫液中的CN-最终分解为NO_3~-、CO_3~(2-)等物质。     

离子交换法处理氰化贫液中铜的工艺及动力学

用201×7离子交换树脂处理黄金氰化贫液的高含量铜,研究了树脂吸附铜的工艺和动力学,考察了温度、pH、液固比和时间对吸附的影响。结果表明,该树脂能有效吸附氰化贫液中的铜。温度和pH对吸附性能影响不大,降低液固比能提高吸附效果;在1.0h后吸附趋于饱和,吸附过程符合一级动力学模型。     

STAC改性有机膨润土去除水体中U（Ⅵ）试验

为探究膨润土对含铀废水的吸附性能,对膨润土进行钠化预改性,然后用十八烷基三甲基氯化铵(STAC)对钠化膨润土进行有机改性,探究模拟含铀废水pH、固液比、反应时间、反应温度、初始浓度对STAC有机改性膨润土吸附U(Ⅵ)的影响,并探究了膨润土吸附动力学和吸附等温曲线。结果表明,当pH=7.04、固液比4.0 g/L、反应时间480 min、反应温度318.15 K、含铀废水初始浓度<10 mg/L时,该吸附材料处理含铀模拟废水的效果最佳,最高吸附率达到99.52%。准二级动力学方程和Langmuir等温吸附模型更适于阐明STAC有机改性膨润土吸附U(Ⅵ)的过程,反应主要是化学吸附和单层吸附。Langmuir拟合吸附容量最高为198.73 mg/g。     

电化学法深度处理低浓度贵金属贫液的研究

以自制的煤基材料为电极,采用电化学法深度处理贵金属贫液,研究了电压、时间、pH值及温度等因素对各离子去除率的影响规律,采用扫描电镜及能谱（SEM-EDS）对反应后极板的表面形貌及负载物组成进行表征分析。实验结果表明,随着处理时间的延长,温度的增加,溶液中各离子的去除率逐渐增大,随着电压增大离子去除率表现为先升后降的趋势,在1.6 V时达到最佳,而pH值的升高不利于反应进行。选用原液pH值,在电压为1.6 V、溶液温度为50 ℃、处理时间为6 h的条件下,钯离子去除率为99.32%,铂离子去除率为97.13%,金与钌离子可视为完全去除。研究证实,采用电化学法可以对低浓度贵金属贫液进行深度处理并实现回收贵金属的目的,该电化学反应由电沉积和电吸附两方面共同作用,且前者占主导作用。     

吸附法脱除硫酸锰溶液中残余有机物

探讨粉煤灰、活性炭和膨润土等吸附剂对硫酸锰溶液中残余少量有机物的吸附效果,并以膨润土为吸附剂进行单因素试验,考察了膨润土用量、吸附时间、pH和温度对吸附效果的影响。结果表明,使用膨润土吸附剂,在溶液pH为7.0,25℃,吸附时间30min,膨润土用量10.0g的条件下,硫酸锰溶液的COD去除率可达32.4%;改性膨润土较未改性原土脱除溶液中有机物的效果更好,且酸化改性膨润土优于热化改性膨润土,COD去除率达到40.8%。     

氰化贫液再利用提高银浸出率试验研究

本文在氰化贫液水质分析的基础上,研究了氰化贫液三种处理方式对生产系统的影响,结果表明氰化贫液直接循环使用于氰化浸出系统对金银浸出对金银浸出不利,必须定期开路部分氰化贫液;采用硫酸亚铁化学络合法处理氰化贫液存在氰化物处理深度不够,需进行二次处理;而氰化贫液采用硫酸亚铁化学络合法消除大部分氰化物的情况下,所得处理后液用于金精矿调浆时,残余氰化物通过高温(焙烧温度达650℃)分解,降低了氰化贫液处理环保风险,还充分利用所含有的大量硫酸钠、碳酸钠等钠盐成分,在原生产工艺加入氢氧化钠作为焙烧预处理剂的基础上,可再提高银浸出率约6%,而对金、铜浸出效果影响很小。     

载铁改性膨润土处理含Cr(Ⅵ)废水试验研究

以载铁方式对膨润土进行改性,并通过静态吸附试验考察溶液pH、温度、吸附时间、改性膨润土用量对Cr(Ⅵ)吸附率的影响;借助SEM及FTIR分析改性前后的膨润土吸附Cr(Ⅵ)后的组成变化及吸附机制。结果表明:膨润土载铁改性后,比表面积大大增加,更有利于吸附废水中的Cr(Ⅵ);溶液pH对Cr(Ⅵ)吸附率影响最大,pH=6时,Cr(Ⅵ)吸附率达85.8%;改性膨润土对Cr(Ⅵ)的吸附机制主要是与Cr(Ⅵ)发生羟基配合反应及离子交换反应。     

P-P-B吸附剂对含Cr3+废水吸附特性研究

利月广西宁明膨润土和PP及PE经发泡塑化造粒制得的吸附剂(P-P-B)对Cr3 的吸附特性进行试验研究。用单因素试验的方法考察了微波加热时间、吸附剂用量、吸附时间、吸附温度、振荡器转速、废水的pH值以及废水中Cr3 离子浓度等因素对其吸附效率的影响。     

离子交换法脱除硫酸镍电解液中痕量铁

采用大孔隙阳离子交换树脂Monophos脱除硫酸镍电解液中的痕量铁,通过正交试验和单因素试验考察了料液浓度、pH、脂液比、温度以及吸附时间对硫酸镍电解液中痕量铁以及镍离子吸附效果的影响。结果表明,影响痕量铁吸附效果主次因素顺序(由大到小)为:时间pH脂液比温度料液浓度。此外,脂液比是影响除铁率与镍损率的一个重要因素。经过4h的吸附,当脂液比为1∶6时,铁脱除率达到89%,镍损失率为13%;当脂液比为1∶12时,铁脱除率达到76%,镍损失率为7%。     

D311树脂对氰化提金尾液中铜氰络合离子的吸附行为

采用D311树脂吸附处理含高铜氰化提金尾液,分别考察了树脂添加量、吸附反应时间、反应温度、溶液p H等对铜氰络合离子吸附率的影响,获得了静态吸附最优工艺条件,并从热力学及动力学角度研究了D311树脂对铜氰络合离子的吸附特征。结果表明:当D311树脂吸附经硫酸铜沉淀预处理后的提金尾液时,在液固比(滤液与树脂体积比)为5∶1、溶液p H9、室温、吸附反应时间135 min的优化工艺条件下,其对铜氰络合离子的吸附率可达98%以上。该吸附过程符合Freundlich吸附模型,为优惠吸附;吸附过程的速度控制步骤为颗粒扩散和化学反应共同控制。采用准一阶动力学模型和准二阶动力学模型分别对吸附动力学数据进行模拟,发现D311树脂对含高铜氰化提金尾液中铜氰络合离子的吸附符合准二阶动力模型,其理论吸附量为12.6023 mg·ml-1,与实验所测的平衡吸附量吻合,吸附速率常数k=1.236×10-2min-1。     

China's Major Non-ferrous Metals Imports & Exports

正~~     

Zinc Production by Province in 2014

正~~     

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.