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国家自然科学基金(51374066)

作品数:7 被引量:31H指数:3
相关作者:杨洪英刘媛媛陈国宝佟琳琳金哲男更多>>
相关机构:东北大学黄金集团更多>>
发文基金:国家自然科学基金国家科技支撑计划国家高技术研究发展计划更多>>
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Function of microorganism and reaction pathway for carrollite dissolution during bioleaching被引量:1
2015年
The function of microorganism and dissolution reaction pathway of carrollite in the bioleaching process were investigated. The results showed that both indirect and contact mechanisms influenced the leaching process. The dissolution of carrollite was significantly accelerated when bacteria were adsorbed on the mineral surface, indicating that the contact mechanism significantly affected the dissolution of carrollite. During bioleaching, the sequence of oxidation state of the sulfur moiety of carrollite was as follows: S?2→S0→S+4→S+6. Elemental sulfur precipitated on the mineral surface, indicating that the dissolution of carrollite occurred via the polysulfide pathway. The surface of carrollite was selectively corroded by bacteria, and oxidation pits with different sizes were observed at various sites. Elemental sulfur, sulfate and sulfite were present on the surface of carrollite during the leaching process, and may have formed a passivation layer on mineral surface.
杨洪英刘伟陈国宝刘媛媛佟琳琳金哲男刘子龙
关键词:BIOLEACHINGMICROORGANISM
DDY3与硫化钠分离某铜钼混合精矿效果比较被引量:1
2014年
内蒙古某铜钼混合精矿铜品位为26.14%、钼品位为0.93%,由于受磨矿、混浮过程中产生的铜离子活化,导致铜钼分离困难。现场采用15 kg/t的硫化钠抑铜浮钼,不仅铜钼分离效果不好,而且会造成尾矿库及选矿厂周边环境污染。为解决上述问题,东北大学相关课题组分别对硫化钠和自制的DDY3用量进行了研究,并对比了DDY3和硫化钠对矿浆浓度、pH值变化的适应性,以及DDY3和硫化钠药液失效时间。结果表明:1DDY3的用量远低于硫化钠,DDY3对矿浆浓度、pH值变化的适应能力明显强于硫化钠,且DDY3的失效缓慢程度远胜于硫化钠。2在矿浆浓度均为25%、pH值均为10.5情况下,选用15 kg/t的现用现配硫化钠为抑制剂,钼精矿钼品位为9.65%、钼回收率为16.23%,铜精矿铜回收率为98.96%;选用1 kg/t的现用现配DDY3为抑制剂,钼精矿钼品位达10.80%、钼回收率达61.33%,铜精矿铜回收率为94.39%。DDY3替代硫化钠用于该铜钼混合精矿的分离,具有高效、环保特征。
王鑫杨洪英陈国宝郭键柄刘子龙
关键词:铜钼分离抑制剂硫化钠
提高复杂铜钴矿石浸出率的试验研究被引量:5
2014年
本文对某复杂铜钴矿石进行了提高浸出率的试验研究。试验通过硫酸浸出的方法浸矿,研究了各因素对铜钴矿浸出效果的影响,并获得了最优浸出条件。与现有工艺相比,本试验中铜、钴的浸出率得到明显提高。
刘媛媛杨洪英熊柳刘伟鑫
关键词:铜钴矿硫酸浸出铜回收浸出率
碱熔试样-原子吸收光谱法测定铜阳极泥预处理渣料中的Sb被引量:3
2017年
铜阳极泥是一种重要的冶金工业副产品,因其中含有多种贵金属和有价金属元素,铜阳极泥的综合回收利用日益受到关注。铜阳极泥预处理富集渣中富含的Sb难以用常规方法溶解,有必要建立一种准确、简便的测试方法实现Sb的定量分析。采用X射线荧光光谱、X射线衍射光谱和场发射扫描电镜能谱分析等多种光谱学分析手段对富集渣的化学成分、物相和微观结构做了全面分析,结果表明,富集渣的化学组成和物理结构复杂,组分化学性质稳定且共生紧密。Sb以高锑酸金属化合物的形式存在,结构稳定化学惰性强。采用Na_2O_2熔融法消解试样,合成标准样品做标准系列,用火焰原子吸收光谱法测定了富集渣中Sb的含量值为8.23%,相对标准偏差为0.97%。该方法的检出限为0.072%,加标回收率为94.9%~99.2%。本方法溶样彻底,不需贵重试剂和仪器,方法简单易行。采用与样品基体相近的合成标准样品,消除了样品化学成分复杂所造成的共存物质干扰。通过标准样品测试验证和其他仪器方法比对,证明本方法灵敏度高,准确性好,可用于铜阳极泥预处理渣料中Sb的定量测定。
董再蒸董再蒸李雪娇童晓旻王琳杨洪英
关键词:铜阳极泥光谱学性质
In situ characterization of natural pyrite bioleaching using electrochemical noise technique被引量:1
2016年
An in situ characterization technique called electrochemical noise(ECN) was used to investigate the bioleaching of natural pyrite.ECN experiments were conducted in four active systems(sulfuric acid,ferric-ion,9k culture medium,and bioleaching solutions).The ECN data were analyzed in both the time and frequency domains.Spectral noise impedance spectra obtained from power spectral density(PSD)plots for different systems were compared.A reaction mechanism was also proposed on the basis of the experimental data analysis.The bioleaching system exhibits the lowest noise resistance of 0.101 MΩ The bioleaching of natural pyrite is considered to be a bio-battery reaction,which distinguishes it from chemical oxidation reactions in ferric-ion and culture-medium(9k) solutions.The corrosion of pyrite becomes more severe over time after the long-term testing of bioleaching.
Guo-bao ChenHong-ying YangHai-jun Li
Leaching kinetics of selenium from copper anode slimes by nitric acid-sulfuric acid mixture被引量:11
2018年
The leaching kinetics of selenium from copper anode slimes was studied in a nitric acid?sulfuric acid mixture.The effects of main parameters on selenium leaching showed that the leaching rate of selenium was practically independent of stirring speed,while dependent on temperature and the concentrations of HNO3and H2SO4.The leaching of selenium includes two stages.The activation energy in the first stage is103.5kJ/mol,and the chemical reaction is the rate controlling step.It was almost independent of H2SO4concentration and dependent on HNO3concentration since the empirical reaction order with respect to HNO3concentration is0.5613.In the second stage,the activation energy is30.6kJ/mol,and the process is controlled by a mixture of diffusion and chemical reaction.The leaching of selenium was almost independent of HNO3concentration.
Hong-ying YANGXue-jiao LILin-lin TONGZhe-nan JINLu YINGuo-bao CHEN
关键词:SELENIUMKINETICS
赞比亚某复杂氧化铜钴矿石的工艺矿物学研究被引量:9
2016年
铜钴矿中含有大量的战略金属钴,从铜钴矿中回收钴和铜金属具有重要经济价值和环保意义。本文研究了某复杂氧化铜钴矿的化学成分、物相组成、嵌布特征、机械和物理性质,为氧化铜钴矿的提取工艺提供理论依据。工艺矿物学研究结果表明,氧化铜钴矿石分为硬岩矿和软岩矿,软岩矿和硬岩矿中假孔雀石的比例都在20%以上,被褐铁矿包裹的铜和存在于黑云母的铜都在60%以上,并且铜钴矿中的铜、钴含量均较低,其中铜含量为1%左右,钴含量为0.05%左右,导致该矿难于处理。根据矿石特点和当地的具体条件,硬岩矿破碎后的块状样部分适合堆浸;硬岩矿破碎后的粉样部分及软岩矿适合搅拌浸出。
刘媛媛杨洪英陈国宝佟琳琳金哲男肖发新
关键词:铜钴矿工艺矿物学氧化矿
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