制酸烧渣综合回收铜钴实验

利用沸腾焙烧得到的硫铁矿制酸烧渣为原料,进行了酸浸、铜萃取、除铁、沉钴、尾渣氰化等综合回收铜钴实验研究。实验结果表明,采用沸腾焙烧—酸浸—萃取—除铁沉钴工艺可得到合格的铁精粉;酸浸铜浸出率为70.08%,钴浸出率为60.07%;铜萃取率93.6%,反萃率93.8%;萃余液除铁率大于99.9%,沉钴率大于98.9%。     

从印尼含镍红土矿中浸出镍、钴工艺试验研究

印尼某含镍红土矿属低镁褐铁矿型,镍主要赋存于褐铁矿中。研究了采用还原焙烧-氨浸、直接氨浸、加压酸浸、直接酸浸—沉矾除铁等工艺从红土矿中浸出镍和钴。结果表明:采用氨浸工艺,镍、钴浸出率较低;采用直接酸浸—沉矾除铁工艺,镍、钴浸出率均在80%~90%,而且浸出矿浆的过滤性能良好;采用加压酸浸工艺,镍、钴浸出率在90%以上。     

低浓度钴溶液除铁、钙、镁和P204深度除杂工艺研究

研究了从低浓度钴溶液中除去铁、钙、镁的pH条件和P204萃取除杂工艺.除铁初步试验表明:黄钠铁矾法除铁时,将pH值控制在3.0～4.0之间,除铁效果很好,达到99％以上.在黄钠铁矾-针铁矿联合法的除铁操作条件下,除铁效果也达到了95.65％,且钴损率从21.3％降到了4.74％;低浓度钴溶液最佳除钙镁pH值为3.5～4.0;正交试验得到P204萃取除杂最佳工艺参数:有机相组成ψP204/ψ汽油为25％/75％,O/A相比1∶2,皂化率为75％.     

铜钴精矿焙烧浸出试验研究

采用浮选、硫酸化焙烧、酸浸、萃取电积、除铁沉钴流程从刚果(金)铜钴精矿中回收铜钴。结果表明,最佳焙烧条件为:粒度-0.074mm占90.77%,添加7.5%的Na2SO4在700℃焙烧30min。焙砂进行两段浸出,铜钴的浸出率分别达到97.61%和95.92%。     

复杂铜钴矿浸出溶液处理试验

以复杂铜钴矿浸出溶液为原料,采用M5774萃取铜,硫酸反萃,铜的萃取率和反萃率均大于99%,萃余液用SO_2/空气混合气氧化中和除铁、锰,除铁后液铁和铝均小于0.005g/L,锰没有完全除掉,采用活性氧化镁沉淀镍和钴,在较优条件下,镍、钴沉淀率分别为97.73%和94.33%,用活性氧化钙沉淀锰和镁。     

P507+N235双溶剂萃取除铁生产实践

介绍了在硫酸介质中使用P507+N235双溶剂萃取体系萃取除铁的工艺应用。通过生产实践发现,铁以三价态被萃取,有机相由15%P507+5%N235+80%260#稀释剂组成,相比2∶1,铁萃取率达到98%以上,在反萃剂为250g/L稀硫酸溶液,相比4∶1的条件下反萃,铁反萃率达到98%以上,反萃液经均相渗析膜分离回收酸,渗析残液通过控制pH,可采用铁矾法、中和除铁和砷酸铁等工艺除铁,铁脱除率均可达到90%以上。     

富钴结壳浸出液分离硫酸锰及硫循环利用

以富钴结壳SO₂还原浸出液为试验原料,开展了除铁、硫化沉淀、制备硫酸锰、硫酸锰焙烧分解、硫循环利用试验,以实现浸出液分离制备硫酸锰及硫循环应用,并确定较优工艺参数,探究锰分解回收及硫循环利用的可能性。结果表明,1)除铁过程：在pH=3.5、时间360 min、通氧气条件下,除铁率达到99%以上;2)硫化沉淀过程：以NaHS为沉淀剂,当S/Co=3时,Ni、Co沉淀率达到98%以上;3)制备硫酸锰过程：在蒸发温度120℃,搅拌速度350 r/min,时间3 h时,结晶物主要成分为MnSO₄·H₂O,Mn含量为27.95%;4)硫循环过程：硫化沉淀后液经蒸发得到的硫酸锰,在无烟煤配比7%、焙烧温度800℃、焙烧时间15～30 min时,硫酸锰分解率最高达到96.72%,分解产物为Mn₃O₄,焙烧过程产生的气体直接进行富钴结壳浸出,Ni、Co、Cu、Mn浸出率均达到95%以上,浸出效果较好,实现了硫循环利用。     

P507+N235双溶剂萃取除铁生产实践

介绍了在硫酸介质中使用P507+N235双溶剂萃取体系萃取除铁的工艺应用。通过生产实践发现,铁以三价态被萃取,有机相由15%P507+5%N235+80%260#稀释剂组成,相比2∶1,铁萃取率达到98%以上,在反萃剂为250g/L稀硫酸溶液,相比4∶1的条件下反萃,铁反萃率达到98%以上,反萃液经均相渗析膜分离回收酸,渗析残液通过控制pH,可采用铁矾法、中和除铁和砷酸铁等工艺除铁,铁脱除率均可达到90%以上。     

针铁矿法从铜钴矿生物浸出液中除铁的研究

采用针铁矿法除去萃铜后的铜钴矿细菌浸出液中的铁,并对除铁时的pH、氧化剂浓度、氧化时间、保温时间等因素进行优化。结果表明,控制氧化过程中pH为4.0、氧化温度70℃、保温时间1h、氧化剂浓度8%,除铁率和钴回收率分别为99.9%和99.5%。针铁矿法除铁可在常压和较低温度(70℃)下进行,而且不需外加其他金属阳离子就能获得过滤性能良好且可作为含铁富矿使用的沉淀渣。     

钴浸出液氧化中和除铁的实验研究

以钴浸出液为原料,以CaCO3为中和剂,以H2O2为氧化剂,通过氧化中和法进行除铁实验。主要考察了H2O2用量、沉淀pH值、反应温度和反应时间对除铁率和钴回收率的影响。实验结果表明:最优的工艺条件是,H2O2用量为理论用量的1.5倍,控制沉淀pH值在4.0,反应温度为80℃,反应时间为2.5 h;在最优工艺条件下除铁率可达99.5%,钴回收率大于99%,除铁效果良好。     

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.