复杂硅酸盐矿物中钪的浸出实验研究

以硅酸盐类含钪矿物为原料,分别用盐酸和硫酸为浸出剂,采用酸浸法对硅酸盐矿物进行了钪的浸出实验,探讨了酸的种类、酸的浓度、酸浸温度、酸浸时间以及固液比对钪的浸出率的影响。实验结果表明,盐酸为浸出剂时钪的浸出率最高可达89.4%,最佳工艺条件是:盐酸浓度15%(质量分数),酸浸温度80℃,酸浸时间10 h,固液比为1∶5;硫酸为浸出剂时钪的浸出率最高可达98.3%,最佳工艺条件是:硫酸浓度35%(质量分数),酸浸温度90℃,酸浸时间12 h,固液比1∶7。     

从钨渣中浸出氧化钪的试验研究

研究了采用硫酸化焙烧—水浸工艺从钨渣中回收钪,考察了硫酸用量、焙烧温度、焙烧时间、水浸温度、水浸时间、水浸液固体积质量比对钪、钨、锰、铁、硅浸出的影响。试验结果表明:最佳条件(硫酸浓度3.5mol/L,焙烧温度200℃,焙烧时间2h,水浸温度90℃,水浸时间1h,水浸液固体积质量比5∶1)下,氧化钪浸出率达93%以上;工艺简单适用。     

酸浸提取赤泥中钪的研究

对比了盐酸、硫酸和硝酸从赤泥中提钪的效果。结果表明,硫酸是一种合适的浸出剂,在硫酸体积浓度为30%、液固比6、100℃浸出120min的条件下,钪浸出率可达84%。影响赤泥中钪浸出率的因素显著性依次为硫酸浓度、反应时间、浸出温度、液固比。     

用硫酸从锡尾矿中浸出铁试验研究

研究了用硫酸从锡选矿尾矿中浸出铁,考察了反应时间、硫酸浓度、液固体积质量比和反应温度对铁浸出率的影响,通过正交试验确定了各因素影响主次及适宜浸出条件。结果表明:铁浸出率随反应时间延长,硫酸浓度、液固体积质量比及反应温度升高而提高;各因素影响顺序为反应温度硫酸浓度液固体积质量比反应时间;在反应温度70℃、硫酸浓度1.5 mol/L、液固体积质量比4 mL/g、反应时间90 min适宜条件下,铁可以完全浸出。     

从氯化渣中浸出钪的研究

以富集钪后的氯化渣为原料,研究了浸出酸种类、原料粒度、浸出酸浓度、浸出液固质量比、浸出温度和浸出时间对钪浸出率的影响.条件试验和正交试验表明,最佳试验条件为:浸出酸种类为硫酸;浸出酸浓度为40％;原料粒度为44 μm(325目);浸出液固质量比为3.5;漫出温度70℃;浸出时间为8h.浸出温度、浸出液固质量比和浸出酸浓度对钪浸出率的影响大小依次为:浸出温度＞浸出液固质量比＞漫出酸浓度.稳定试验表明:钪的漫出率在95％以上,为下步进行钪的回收创造了有利条件.     

木薯渣—硫酸法浸出低品位软锰矿试验研究

研究了用木薯渣─硫酸法浸出低品位软锰矿,即以木薯渣作还原剂,在硫酸溶液中浸出低品位软锰矿。通过正交试验,考察了硫酸初始质量浓度、温度、固液质量体积比和反应时间对锰浸出效果的影响。结果表明,对锰浸出率影响较大的依次为温度、硫酸初始质量浓度、反应时间和固液质量体积比。单因素试验结果表明:锰浸出率随温度升高、硫酸初始质量浓度增大、反应时间延长和木薯渣添加量增加而提高;在温度90℃、硫酸初始质量浓度200g/L、反应时间4h、固液质量体积比1∶15、木薯渣与软锰矿质量比1∶6.79条件下,锰浸出率达97.32%。     

从砷碱渣中浸出砷的试验研究

研究了以水热浸出法和硫酸浸出法从砷碱渣中浸出砷,考察了浸出时间、浸出温度、液固体积质量比及硫酸浓度对砷浸出率的影响。试验结果表明:相同条件下,水热浸出效果明显优于硫酸浸出效果;水热浸出时,各因素对砷浸出率的影响顺序为浸出时间浸出温度液固体积质量比,而硫酸浸出时,各因素的影响顺序为液固体积质量比硫酸浓度浸出温度浸出时间;在浸出时间30min、浸出温度40℃、液固体积质量比12∶1条件下,砷的水热浸出率为78.12%。     

某砂岩型铀矿石浸出渣样铀钪浸出特征及机理

随着高品位铀矿的枯竭,从低品位铀矿石中回收伴生元素以降低生产成本成为趋势。在溶浸采铀过程中,为了提高铀及其伴生元素钪的浸出率,以某砂岩型铀矿碱性柱浸后的渣样为研究对象,通过室内静态试验,探究不同硫酸浓度、液固比、温度对铀和钪浸出率的影响,并根据未反应收缩核模型建立浸出动力学模型。结果表明：硫酸浓度为30 g/L、液固比2 mL/g、浸出时间192 h条件下,铀和钪的浸出率随着温度的升高而增加;温度低于30 ℃时,浸出过程受化学反应控制,浸出速率增加较快,但浸出率低;温度高于30 ℃后,浸出过程受混合控制,且铀的浸出速率要高于钪,铀和钪受混合控制的浸出过程的活化能分别为41.28、15.887 kJ/mol。     

钒钛磁铁矿尾矿中钪的直接酸浸试验研究

陕西洋县毕机沟钒钛磁铁矿尾矿中氧化钪含量为97.08 g/t,为了充分回收这部分稀土资源,通过直接酸浸对钪进行浸出,系统研究了酸的种类及用量、助浸剂种类及用量、浸出温度、浸出液固比、浸出时间以及入料细度对钪浸出效果的影响。结果表明：不添加助浸剂的情况下,硫酸、盐酸、硫酸+氢氟酸、盐酸+氢氟酸对尾矿中钪的浸出效果均很差,但盐酸的浸出率较硫酸高,在盐酸体系下添加2^#助浸剂能够显著提高钪的浸出率;将尾矿磨矿至-0.075 mm占80%的细度,在2^#助浸剂用量15%、盐酸浓度6 mol/L、液固比3∶1、浸出温度90℃、浸出时间6 h的最佳条件下,钪浸出率达89.53%。该直接酸浸工艺对钪的浸出率高,且可操作性比较强,能够促进从尾矿中回收钪的发展。     

微波辅助硫酸浸出红土镍矿的研究

以红土镍矿为原料,研究了微波辅助硫酸浸出镍钴的工艺条件。考察了硫酸浓度、微波功率、微波温度、辐射时间、液固体积质量比对镍钴浸出率的影响。结果表明,在硫酸浓度3.0mol/L、微波功率700 W、微波温度90℃、辐射时间2.5 h、液固体积质量比4:1的最佳工艺条件下,镍浸出率达91%,钴浸出率65%以上。     

熔炼次数对M17返回料合金成分、组织和性能的影响

实验结果表明,M17铸造高温合金(%:0.16C、8.79Cr、5.79A1、4.93Ti、3.29Mo、15.20Co、0.78V、0.015B、0.073Zr、0.002S、0.001P、0.001 1O、0.001 0N)经25 kg真空感应炉返回重熔后,Si含量随重熔次数的增加而略有增加,合金中主要元素和其它杂质元素S、P、H的含量变化不大,而氧、氮略有增加;合金中初生碳化物由新合金中的草书体逐渐向返回合金块状转变,初生碳化物的遗传性堵塞合金凝固时的补缩通道,使返回料合金的疏松倾向增大,高温塑性下降较大。     

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.