从含锗氧化锌烟尘中提取锌锗

以氧化锌烟尘为原料、硫酸为浸出剂,研究了含锗氧化锌烟尘的浸出过程。最佳工艺条件为:烟尘用量50g、硫酸用量20mL、反应温度80℃、反应时间2h、液固比41,在该条件下,锌、锗的浸出率分别为89.12%和89.75%。将浸出液的pH调至2.5,在沉淀温度60℃,搅拌时间30min的条件下,采用浸出液中锗量40倍的单宁酸进行沉锗,锗的沉淀率达97.2%,得到含锗0.809%的单宁渣,该沉淀渣在600℃灼烧1h后得到品位为14.55%的锗精矿。沉锗后液可返回锌生产。     

机械活化强化钴白合金酸浸钴的试验研究

研究了从白合金中湿法回收钴。在硫酸体系中,以空气作氧化剂,采用机械活化钴白合金,考察了活化时间、反应温度及浸出剂浓度对钴浸出率的影响。结果表明:钴浸出率随机械活化时间延长、反应温度升高、浸出剂浓度增大而提高;机械活化使白合金颗粒变细,比表面积增大,活性增强,从而有利于金属浸出;在硫酸浓度为3mol/L、反应温度为80℃、浸出时间为12h、液固体积质量比为8∶1、空气通入量为4L/min、搅拌速度为150r/min条件下,未活化钴白合金的钴浸出率为63.2%,而活化60 min的钴白合金的钴浸出率为96.1%。     

微波活化焙烧对粉煤灰中钛浸出率的影响

粉煤灰的性质稳定,难以有效地提取各种有用金属,采用微波焙烧、氢氧化钠作为活化剂的方法处理粉煤灰,能有效地改善粉煤灰的活性,提高钛的浸出率。本实验研究了粉煤灰对微波的吸波效果,以及微波焙烧功率、焙烧时间和氢氧化钠三个因素对粉煤灰中钛浸出率的影响。选取粉煤灰的浸出条件为:盐酸浓度11.64 mol/L、浸出温度88℃、浸出时间8 h、搅拌速度20 r/s、盐酸和粉煤灰液固比为9。通过试验,得到了最佳的微波活化结果:粉煤灰与氢氧化钠按1:1的质量比混匀后,在微波800 W的功率下焙烧5 min,钛的浸出率达到85.77%。     

粉煤灰碳酸钠烧结工艺中影响锂浸出率因素的研究

以粉煤灰和碳酸钠为原料,采用正交试验探讨了烧结时影响粉煤灰中锂浸出率的因素。结果表明,在碳酸钠与粉煤灰以1∶1的比例在900℃焙烧2h的条件下,锂浸出率可以达到65%。     

湖北某银矿锌尾渣中锌的浸出试验研究

湖北某银矿锌尾渣中含锌44.38%,大部分锌以硫化锌的形式存在。为了回收利用锌尾渣中的锌,对样品在880℃条件下焙烧5h后采用硫酸作为浸出剂,考察硫酸浓度、反应时间、反应温度、液固比对锌浸出率的影响。试验结果表明,在硫酸浓度为2mol/L、液固比为14:1、反应时间为90min,反应温度为80℃的条件下浸出,最终可获得锌的浸出率高达91.1%。     

疏松型粉煤灰硫酸水热浸出法提取铝

以内蒙古某电厂疏松型粉煤灰为研究对象,采用硫酸水热浸出的方法提取粉煤灰中的铝,在分析粉煤灰成分、形貌和物相的基础上,研究浸出温度、浸出时间、硫酸浓度、硫酸用量工艺参数对铝提取率的影响,通过X射线衍射对浸出渣的物相进行表征。结果表明,在浸出温度为180 ℃、浸出时间为4 h、硫酸浓度(质量分数)为61%、硫酸用量为理论值的3倍的条件下浸出粉煤灰,铝的提取率可达88%以上。该工艺具有浸出温度低、硫酸浓度低、铝提取率较高等特点,对疏松型粉煤灰的开发利用具有实际意义。     

废旧高温合金酸浸工艺研究

以硫酸为浸出剂,采用正交法,研究了废旧高温合金浸出的最佳工艺条件。结果表明,在下述优化后的条件下,镍、钴的浸出率均达99.5%以上、铬浸出率达96%以上、钽浸出率小于2%:硫酸浓度343g/L、反应温度80℃、反应时间3h。     

用盐酸从加碱焙烧粉煤灰中浸出钛

研究了采用加碱焙烧—盐酸浸出法从粉煤灰中浸出钛,考察了盐酸浓度、浸出温度、浸出时间、搅拌速度和液固体积质量比对钛浸出率的影响。试验结果表明:将粉煤灰与氢氧化钠按质量比1∶1混匀,在微波功率800 W下焙烧5min后再进行浸出,钛浸出效果更好;在盐酸浓度11.64mol/L、浸出温度88℃、浸出时间8h、搅拌速度1 200r/min、液固体积质量比9∶1条件下,钛浸出率为85.77%。     

EDTA和EDTA+CA浸出电镀污泥中金属铜的动力学

采用EDTA和EDTA+柠檬酸(CA)两种浸出剂浸出电镀污泥中金属铜，重点研究了EDTA浓度、EDTA+CA中CA的比例、温度对金属铜浸出的影响，并分析了浸出动力学。结果表明，EDTA剂在70 mmol/L、温度55 ℃、浸出时间3 h的条件下对铜的浸出率达到了80.61%，而70 mmol/L EDTA+10 mmol/L CA、温度55 ℃、浸出时间3 h的条件下对铜的浸出率为90.32%。浸出过程可用Avrami方程加以描述，EDTA和EDTA+CA浸出反应表观活化能分别为43.00、45.74 kJ/mol，浸出均属于混合控制且以表面化学控制为主导。     

粉煤灰硫酸化焙烧提取氧化铝的研究

研究了粉煤灰硫酸化焙烧提取氧化铝的工艺。对焙烧温度、时间、酸矿比、粒度等影响因素进行了研究,确定最佳工艺条件:粉煤灰粒度为-400目占95%以上,焙烧温度320℃,时间2h,酸矿比1.6,在此条件下粉煤灰中氧化铝浸出率可达87%,且硫酸试剂通过再生实现循环利用。通过XRD和扫描电镜对酸焙烧过程中粉煤灰的物相变化进行了研究。     

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.