还原焙烧分步浸出工艺从废旧锂离子电池中回收有价金属

以废旧三元正极材料作为原料,提出了还原焙烧与氨基磺酸浸出相结合的工艺,提高锂的回收效率,同时实现组分的分步分离回收。在焙烧温度650℃、碳用量10%、还原焙烧时间90 min条件下,三元正极材料被还原为Li₂CO₃、NiO、MnO、Ni、Co的混合物,还原焙烧产物分步浸出,水浸回收锂,酸浸回收镍、钴、锰。采用氨基磺酸浸出水浸渣,最佳酸浸条件：氨基磺酸浓度0.75 mol/L、浸出温度60℃、固液比28 g/L、浸出时间40 min,此条件下镍、钴、锰的浸出率分别可以达到98.77%、98.71%、98.45%。     

低温焦硫酸钾焙烧选择性回收退役三元锂电池中的锂

通过低温焦硫酸钾焙烧与盐溶液浸出复合,实现了退役三元锂电池正极材料中锂的选择性回收。系统研究了焙烧温度、焦硫酸钾与正极材料质量比、焙烧时间对锂、钴、镍、锰回收效果的影响和作用机制。结果表明,在焙烧温度350 ℃、正极材料与焦硫酸钾质量比1︰2、焙烧时间60 min的条件下,再经草酸钾水溶液浸出后,锂的回收率达到97.21%,镍的浸出率为2.61%,钴的浸出率为3.1%,锰的浸出率为10.8%。同时,采用XRD、SEM和EDS表征焙烧前后材料的晶体结构、表面形貌以及元素组成变化,阐明了焦硫酸钾焙烧过程中锂、钴、镍、锰的相转化机制。与传统湿法、火法和生物冶金法相比,该回收技术低能耗、应用前景广阔。     

从废旧电池正极材料低酸浸出渣中高压酸浸钴镍锰锂试验研究

针对废旧电池正极材料低酸浸出渣常压酸浸钴、镍、锰生产效率低、回收率不高等问题,研究了采用高压酸浸工艺浸出有价金属,考察了硫酸浓度、液固体积质量比、温度、反应时间、还原剂种类及加入量对钴、镍、锰、锂浸出率的影响。结果表明:在硫酸浓度4.0mol/L、液固体积质量比8.0mL/g、温度140℃、反应时间120min、还原剂五水硫代硫酸钠用量0.5g/8g渣条件下,钴、镍、锰、锂浸出率均在99%以上,钴、镍金属损失率不到0.2%,且浸出渣可循环利用,具有较好的工业应用价值。     

从锂锰渣中分离锰锂试验研究

根据锂锰渣的特性,研究了以锂锰渣为原料,经焙烧、浸出、过滤等工序分离锂、锰的可行性。通过单因素试验,考察了焙烧温度、焙烧时间、浸出温度、浸出时间和酸用量对锂浸出率的影响。试验结果表明,在焙烧温度400℃、焙烧时间2h、浸出温度40℃、浸出时间30min条件下,锂浸出率为86.39%,锂回收率为78.0%,锂、锰分离效果较好。     

从复杂镍钴物料中浸出镍钴工艺研究

研究了采用硫酸浸出—硫酸化焙烧—水浸出工艺从复杂镍钴物料中浸出镍、钴,考察了物料在预处理过程中加酸与不加酸条件下的浸出效果,以及浸出渣焙烧过程中酸料质量比、催化剂用量、焙烧温度、焙烧时间等对镍、钴浸出率的影响。试验结果表明:经硫酸浸出预处理后的硫化镍钴物料,在酸料质量比0.85∶1、硫酸钠用量为物料质量4%、焙烧温度450℃、焙烧时间120min条件下进行焙烧,然后再用水浸出,镍、钴浸出率分别可达98.08%和98.79%,镍、钴浸出效果较好。     

从废旧锂离子电池中回收镍钴锰试验研究

研究了采用H₂SO₄+Na₂SO₃溶液从废旧锂电池正极材料中浸出有价金属镍、钴、锰,然后以共沉淀—固相法从浸出液中回收镍钴锰酸锂,考察了硫酸浓度、亚硫酸钠用量、浸出时间、温度和液固体积质量比对金属浸出率的影响。结果表明：在硫酸浓度2 mol/L、亚硫酸钠用量为理论量1.2倍、温度70℃、浸出时间90 min、液固体积质量比11 mL/1 g条件下,镍、钴、锰浸出率分别为98.21%、97.46%、96.87%;从浸出液中回收的镍钴锰酸锂结晶性良好,金属元素分布均匀,可用于制备电池正极。     

氨浸工艺从废旧锂电池中选择性回收有价金属

研究了碳酸氢铵-还原剂体系选择性浸出废旧三元锂电池中锂、镍、钴的过程。考察了浸出温度、碳酸氢铵浓度、还原剂的种类和浓度、固液比及浸出时间等对有价金属浸出率的影响,并通过XRD、SEM-EDS和FT-IR等表征方法对选择性浸出机理进行了初步探明。结果表明：在浸出温度80 ℃、浸出时间2.5 h、碳酸氢铵浓度2.5 mol/L、固液比50 g/L、还原剂亚硫酸钠浓度0.6 mol/L的条件下,锂、镍、钴的浸出率分别为96.86%、96.36%、93.43%,而锰几乎不被浸出。碳酸氢铵-亚硫酸钠还原浸出体系可以实现从废旧三元锂电池材料中高效、选择性回收锂、镍和钴。     

用硫酸-亚硫酸钠从废旧三元锂离子电池材料中浸出镍钴锰锂

研究了用焙烧、破碎、筛分方法从废旧三元锂离子电池材料中分离电池钢壳、集流体与活性物质,然后用H_2SO_4-Na_2SO_3溶液从活性物质中浸出镍钴锰锂,考察了硫酸用量、亚硫酸钠用量、温度、反应时间和液固体积质量比对钴、镍、锰、锂浸出率的影响。结果表明:对于50g废电池活性物质,在浓硫酸用量65mL,亚硫酸钠用量50g、反应时间1.5h、温度70℃、液固体积质量比10∶1条件下,钴、镍、锰、锂浸出率分别为99.02%、98.56%、97.87%、99.13%,浸出效果较好。     

用硫酸盐化焙烧东湘桥锰矿石的探讨

在小型石英反应管中用模拟的黄铁矿焙烧气和有色冶炼厂含二氧化硫废气对东湘桥氧化锰矿石进行了硫酸盐化焙烧条件实验。考察了焙烧温度、焙烧时间、磨矿细度、添加剂种类和用量,二氧化硫浓度等条件对矿石中有价元素锰、钴和镍浸出率的影响。实验结果发现,焙烧的温度制度、磨矿细度和添加剂对各元素的浸出率有显著的影响,其它条件影响不大。可以推荐下列工艺制度:矿石细磨添加2-3%硫酸钠造粒,在400℃和700℃左右用含SO₂废气进行两段硫酸盐化焙烧,而后浸出。由此可得锰浸出率一般大于90%,最高可达97%;钴浸出率大于80%,最高亦达97%。在利用含SO₂废气时,可以利用废气余热一段加热,只要废气温度高于400℃,矿石充分磨细,也可以得到较满意的结果。     

褐铁型红土镍矿活化预处理后选择性浸出镍钴

以褐铁型红土镍矿为原料,研究了其活化预处理后镍、钴和铁的选择性浸出。考察了温度、时间、液固比、搅拌转速及氟化钠加入量对金属浸出效果的影响,得出最佳工艺条件为:温度85℃、浸出时间3h、液固比5∶1(mL/g)、搅拌速度400r/min及NaF添加量4%,镍、钴浸出率高达85.62%和94.26%,铁以黄钠铁矾的形式进入渣相,浸出率低至2.43%。活化预处理可以实现褐铁型红土镍矿中镍、钴和铁的选择性浸出。     

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.