亚甲基蓝还原浸出低品位钴土矿

采用亚甲基蓝作为还原剂,在硫酸体系中直接浸出低品位钴土矿,考察了亚甲基蓝浓度、硫酸浓度、反应温度、反应时间等对浸出率的影响。结果表明,在下述最优条件下,钴土矿中钴和锰的浸出率可同时达到99%以上:硫酸初始浓度1.6mol/L,亚甲基蓝初始浓度5g/L,反应温度95℃,浸出时间4h,液固比3∶1。     

用硫酸从钴土矿中还原浸出钴的试验研究

针对琼北地区某钴土矿,以硫酸亚铁和稀硫酸作浸取剂,通过一系列单因素条件试验,考察了温度、时间、硫酸初始浓度、搅拌转速和液固体积质量比对钴浸出率的影响。试验结果表明:在反应温度50℃、浸出时间2h、硫酸初始浓度1.2mol/L、搅拌转速250r/min、液固体积质量比10∶1条件下,钴浸出率可达96.1%。在优化条件下重复试验,钴平均浸出率达满意结果。     

某种铜钴矿的浸出过程试验探索

通过对铜钴矿的浸出试验探索,得出铜钴矿样为含钴氧化矿,适宜还原酸浸,浓硫酸酸浸效果更好,还原体系为双氧水与亚硫酸钠组合。最优试验条件为液固比5∶1,加入浓硫酸理论量的1.5倍,按照先后顺序加入双氧水量为矿样质量55.5%和亚硫酸钠量为矿样质量10%,温度70℃,反应时间30 min。在最优的试验条件下进行铜钴矿的浸出试验,钴的浸出率达到99%以上,铜的浸出率达到98%以上。     

菲律宾某红土矿两段酸浸研究

研究了一段高酸—二段中和两段联合浸出红土矿新工艺。结果表明,该红土矿经人工分级后,细粒级矿石在温度95℃、反应时间6 h、初始矿浆浓度32%、酸矿比1.05的条件下,镍、钴一段高酸浸出率分别为97.39%、94.14%;一段浸出后矿浆与粗粒级矿石矿浆混合后在温度95℃、反应时间15 h、粗细粒级矿石质量比1.34的条件下,镍、钴二段中和浸出率分别为82.04%、93.35%,浸出后液含铁浓度小于2 g/L。     

两矿法浸出钴白合金工艺及机制研究

研究了采用钴白合金-水钴矿两矿法从钴白合金中浸出钴和铜,考察了浸出温度、硫酸浓度、液固体积质量比、反应时间、搅拌速度、两矿质量比对钴、铜浸出率的影响。试验结果表明:在温度70℃、硫酸浓度1mol/L、液固体积质量比6∶1、反应时间4h、搅拌速度350r/min、水钴矿和钴白合金质量比16∶1条件下,钴、铜浸出率分别为99.8%和99.2%;钴白合金和水钴矿的氧化还原反应过程是通过Fe2+与Fe3+在反应溶液中的电子转移实现的。     

某氧化铜钴矿硫酸浸出试验研究

采用硫酸为浸出剂,对氧化铜钴矿浸出工艺进行了研究。试验结果表明:硫酸加入量为氧化铜钴矿质量的12.5%,氧化铜钴矿粒度磨样-74μm占87%,浸出温度80℃,浸出时间2 h,浸出液固比L/S=2∶1;铜浸出率为89.26%,钴浸出率为78.69%。     

复杂低品位氧化铜钴矿两段逆流直接还原浸出工艺

针对复杂低品位氧化铜钴矿开展直接还原浸出工艺研究。结果表明,在液固比2∶1(mL/g)、浸出温度80℃、吨矿酸耗117.2kg、浸出时间4h、通入二氧化硫气体控制浸出终点电位340~350mV的条件下,铜、镍、钴浸出率分别为74.23%、47.82%和59.31%。采用两段逆流浸出可以节约还原剂用量,综合利用浸出液中的游离酸,节省碱的消耗量。     

低品位钴矿的细菌浸出试验研究

介绍了含钴硫化矿细菌浸出的研究现状和机理.用T.f菌对某地贫钴矿进行了探索性浸出试验,结果表明,在矿浆浓度＜20%,浸出时间＞10 d条件下,钴浸出率可达55%～60%.     

双氧水还原浸出非洲氧化铜钴矿的试验研究

采用双氧水还原浸出非洲氧化铜钴矿,研究了还原剂用量、初始酸浓度、液固比、浸出温度和浸出时间等参数对浸出过程的影响。结果表明:使用双氧水与铜钴矿计量比为0.2mL/g、浓硫酸与铜钴矿质量比为0.46、液固比为5∶1(mL/g),在温度75℃下浸出2h,钴、铜的浸出率分别达到了99.50%,99.42%。     

某铜钴矿的硫酸还原浸出研究

研究了刚果(金)某铜钴矿的硫酸还原浸出。结果表明,在矿样粒度为-0.074mm占90%、终点pH为1.5、SO2用量为理论量的1.5倍(4kg/t)、浸出温度80℃、浸出时间120min、液固比4∶1的条件下,铜、钴浸出率分别达到了93.35%和90.13%。在此基础上进行了模拟堆浸的柱浸试验,柱浸采用先浸铜再还原浸钴的分步浸出方式,铜浸出率达72%,钴浸出率为66%。     

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.