微生物浸出低品位铜矿的研究

进行了微生物浸出低品位铜矿的研究。用从矿山分离的对Fe2+和元素硫氧化活性高的细菌浸出低品位黄铜矿,摇瓶浸出21d,矿石中铜的浸出率为26.8%;柱式渗滤浸出32d,矿石中铜的浸出率为14.5%。     

云南某低品位硫化铜镍矿细菌浸出试验研究

从研究云南省某地硫化铜镍矿的矿物的组成及工艺矿物学特征入手，进行了细菌浸出试验研究。细菌浸出在实验室中常温条件下静态浸出150d，镍的浸出率在杯浸中为33．67％。47．43％，柱浸中为36．87％，柱浸铜的浸出率为24．22％。探讨了采用细菌浸出进一步回收低品位硫化铜镍矿的可行性。     

矿石粒度对活性炭催化低品位原生硫化铜矿石细菌氧化的影响

通过摇瓶试验,研究了矿石粒度对活性炭催化原生硫化铜矿石细菌氧化浸出的影响。结果表明：在活性炭催化低品位原生硫化铜矿石细菌浸出过程中,矿石粒度对铜的浸出率有较大影响。矿石粒度小于0．1mm最有利于铜的浸出,浸出240h,铜浸出率达83％;矿石粒度过细,溶液中三价铁含量升高,产生的铁沉淀物会直接影响铜的浸出。     

低品位氧化铜矿及空区残矿可浸性试验

针对武山铜矿的低品位氧化铜矿及含矿围岩进行了小型浸出试验。试验表明武山铜矿该类型矿石的浸出较复杂，但在优化的工艺条件下，即溶浸剂浓度3％，氧化剂用量0．25％，强化剂用量2．5％，浸出时间为1h，浸出率可达60％～75％。由于矿石的氧化率约为30％，仅靠单一酸浸，其浸出率难有较大的提高，应进一步开展强化浸出的试验研究工作。     

含砷低品位硫化铜矿生物柱浸实验

介绍了含砷低品位硫化铜矿柱浸实验研究方法、装置和结果.实验在八根有机玻璃柱浸系统中进行,考察了细菌种类、矿石粒度、供氧条件及浸出周期等参数对浸出率的影响.结果表明,在-12mm粒度下,采用Z08090-O菌株浸出,浸出167d,铜浸出率为80.75%.对含大量黄铁矿且耗酸脉石少的矿石,酸的累积降低了采用普通驯化浸矿菌的铜浸出率,但采用激光诱变获得的耐低pH值浸矿菌,能够保持高效的铜浸出率.     

低品位次生硫化铜矿生物堆浸工艺优化研究

针对低品位次生硫化铜矿生物堆浸生产中浸出周期长的问题,进行了不同矿石粒度、不同堆高对铜、铁浸出影响的实验室试验和现场柱浸工业试验,优化了生物堆浸工艺,缩短浸出周期,提高了铜浸出率。结果表明,矿石粒度的降低可显著提高铜的浸出率,且不提高铁的溶出。相同粒度条件下,堆高提高有利于堆内温度保持,铜浸出率随之升高。-40mm工业柱浸出194d,铜的浸出率为62.67%,比-80mm高出10个百分点。     

某混合铜矿生物浸出铜的试验研究

研究了采用细菌氧化-硫酸浸出法从某低品位混合铜矿中浸出铜.采用摇瓶浸出、模拟半连续搅拌浸出和柱浸,考察了浸出过程中铁、氮、磷浓度对生物活性的影响.结果表明:摇瓶浸出试验中,矿浆浓度为10％、浸出6d以上条件下,铜浸出率为66.0％以上;铁、氮、磷质量浓度越高,越快被消耗;pH控制在2.0时,铁、氮、磷质量浓度分别降至100、200、5 mg/L,菌液仍保持较高活性.模拟半连续浸出试验中,矿浆浓度为10％时,铜浸出率超过75％,最高达85.3％;柱浸试验中,氧化浸出23周,铜浸出率为71.0％;矿石浸出时消耗磷,应适当补加.     

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。     

含铜金矿生物浸出渣铜品位对氰化提金的影响

对紫金山低品位含铜金矿进行生物浸出—介质转换—氰化提金摇瓶试验,考察不同生物浸出周期铜的浸出率以及生物浸出渣中铜的品位对后续氰化提金的影响。结果表明,生物浸出12d,含铜金矿中73%的铜溶出,浸出渣铜品位降至0.096%。生物浸出渣铜品位对氰化浸出有显著影响,随着铜品位的升高,氰化钠耗量、氰化过程铜的浸出率以及贵液铜浓度均升高。为降低铜对氰化提金的影响,生物浸出渣中铜的品位应降至0.1%以下。     

某中硫含铜金矿石的细菌预氧化——堆浸提金试验研究

河北某金矿矿石属中硫含铜难浸金矿石，其中包裹金含量达28.77%。该矿石常规全泥氰化金浸出率仅为51.78%。本试验在堆浸前对矿石进行了细菌氧化预处理，试验结果表明：0－5mm粒级矿石经45d氧化后，Fe的氧化率为28．16％，S的氧化率为25．43％，Cu的氧化率为44．62％，氰化堆浸金的浸出率可达80.35%。     

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.