硫砷铜矿化学浸出动力学研究

模拟生物堆浸工艺条件,在硫酸铁酸性介质体系下,进行硫砷铜矿化学浸出动力学实验研究。硫砷铜矿化学性质稳定,在初始Fe3+浓度31 g·L-1,Fe2+浓度0.02 g·L-1,初始p H=1.00±0.05,氧化还原电位恒定在(900±5)m V,30℃条件下浸出96 h,硫砷铜矿的浸出率仅有2.49%。不同电位对硫砷铜矿浸出的影响结果表明,硫砷铜矿的浸出率与电位呈弱正相关,30,45,60,75℃时硫砷铜矿的浸出率与电位的关联指数分别为0.0037,0.0053,0.0062,0.0120。低温下电位对溶解速率影响很小,高温下较显著。研究了温度对硫砷铜矿浸出的影响,氧化还原电位在800 m V时,温度在30~75℃范围,硫砷铜矿硫酸铁酸性化学浸出的表观活化能Ea=57.87 k J·mol-1。实验结果表明,硫酸铁酸性浸出硫砷铜矿符合典型的缩核模型,速率受表面化学反应控制,而非扩散。结合低品位次生硫化铜矿生物堆浸生产实际,为生产实践提出了工艺优化措施。     

不同初始条件对细菌浸出电子线路板中铜的影响

利用筛选的氧化亚铁硫杆菌,研究了初始pH、Fe2+质量浓度以及氧化亚铁硫杆菌的驯化对电子线路板中金属铜浸出的影响。结果表明:酸性条件有利于保持铁离子浓度,从而提高浸出速度,浸出最佳pH为1.5;初始Fe2+质量浓度越高,越有利于铜的浸出,最佳Fe2+质量浓度为9.0 g/L;氧化亚铁硫杆菌驯化与否对铜的浸出影响不大。     

铁离子对土状铜矿中铜浸出影响研究

考察Fe3+浓度、Fe3+/Fe2+对土状铜矿中铜浸出率的影响,分析了酸浸过程中铁离子提高铜浸出率的机理。结果表明,在矿浆浓度30%、酸浓度36.8g/L、12.0g/L硫酸铁溶液浸出土状矿48h后,铜浸出率为62.4%,与无铁时铜浸出率相比提高了10个百分点。其中有92.6%游离氧化铜、70.3%结合氧化铜、35.6%次生硫化铜和11.8%原生硫化铜被浸出,除原生硫化铜外,均比无铁时有明显提高。并且随着Fe2+/Fe3+的降低,铜浸出率逐渐增加。增加Fe3+浓度提高了溶液电位,从而提高铜浸出率。     

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。     

高冰镍浸出渣还原浸出工艺研究

以湿法冶炼高冰镍过程中产生的高冰镍浸出渣为研究对象,采用二氧化硫对高冰镍渣加压还原浸出,考察了初始硫酸浓度、液固比、通气方式、浸出温度和浸出时间对高冰镍渣还原浸出过程铜、铁行为的影响;对还原浸出液采用置换沉淀和冷冻结晶的方法,对还原浸出中铜和铁进行分离回收。结果表明：在初始硫酸浓度100 g/L、液固比6 mL/g、反应时间3 h、反应温度90℃、二氧化硫分压0.15 MPa的条件下,铁和铜的浸出率分别为99.35%、77.46%,浸出液中铁几乎全部为亚铁离子;在硫酸含量20～30 g/L、温度70℃、铁粉加入量5.7 g/L、反应时间40 min的条件下,对还原浸出液进行置换沉铜,沉铜率达到了99.70%,渣含铜为67.91%。在温度—10℃、保温时间20～30 min、初始硫酸浓度100 g/L的条件下,对沉铜后液进行冷冻结晶制备硫酸亚铁,铁沉淀率达到了72.6%,七水硫酸亚铁纯度达到了92.93%。     

氧化浸出法从黑铜泥中分离回收铜砷试验研究

研究了采用氧化浸出法从黑铜泥中综合回收铜砷,考察了酸度、双氧水用量、温度、浸出时间、液固体积质量比对铜和砷浸出率的影响。结果表明：在酸度200 g/L、双氧水用量30%、温度80℃、浸出时间2.0 h、液固体积质量比9∶1条件下,铜、砷浸出率达99.53%和98.24%;氧化酸浸液按n(NaHS)/n(Cu)=1.1加入硫氢化钠进行沉铜,铜砷分离后液中铜质量浓度低于0.01 g/L,砷质量浓度大于40 g/L,铜砷得到有效分离;富砷液通入二氧化硫还原,可得到三氧化二砷和还原后液,还原后液可返回氧化浸出。     

难浸金矿硫脲浸出试验研究

在有氧化剂存在的条件下,采用硫脲酸性浸出难浸金矿中的金,并考察了各种影响金浸出率的因素。结果表明,最佳浸金条件是:硫酸初始浓度1.3mol/L、硫脲浓度14g/L、硫酸铁浓度24g/L、液固比10∶1、浸出时间10h,金浸出率可达80%左右。     

活性炭催化低品位原生硫化铜矿石酸浸研究

根据电化学原理,研究了活性炭催化低品位原生硫化铜矿石酸浸效果。结果表明,添加活性碳可以大大加快铜的浸出速度并提高铜浸出率;初始活性碳质量浓度为5.0g/L,最有利于铜的浸出;浸出240h后,铜浸出率升高到83%,比不添加活性炭时提高了近80%。活性碳加快浸铜速度并提高铜浸出率的原因是活性碳与黄铜矿之间形成了原电池。当有活性碳存在时,低品位原生硫化铜矿石在低氧化还原电位下比高氧化还原电位下更有利于浸出。     

响应曲面法优化氧化亚铁硫杆菌氧化Fe2+工艺条件试验研究

在单因素试验基础上,研究了响应曲面法优化氧化亚铁硫杆菌氧化Fe2+的工艺条件。结果表明,初始ρ(Fe2+)、初始pH值、培养温度、接种量与响应值Fe2+氧化速率有显著相关性。典型性分析得到氧化亚铁硫杆菌氧化Fe2+的最佳工艺条件为:初始ρ(Fe2+)为8.44 g/L,溶液初始pH值为2.1,培养温度为33℃,接种量为12%。在此条件下,Fe2+氧化速率理论值达到0.217 g/(L.h),验证试验条件下实际最大氧化速率为0.215 g/(L.h)。     

铜电解含砷废物加压氧化浸出工艺及浸出动力学

考察铜电解含砷废物加压酸性氧化浸出铜、砷的可能性,对浸出过程进行动力学分析,考察温度、压力、酸度等工艺参数对浸出效率的影响,确定生产的最佳工艺条件。铜、砷浸出过程遵守界面化学反应控制的收缩核模型,反应的表观活化能分别为80.23和73.29 kJ/mol。铜电解含砷废物加压氧化浸出最优工艺条件为：L/S=6～10、初始硫酸浓度80～120 g/L、氧分压0.3～0.4 MPa、温度120～130℃、氧化时间1～1.5 h,铜、砷浸出率均大于98%。     

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.