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《有色冶金设计与研究》2017,(1)
在对钴湿法冶炼工艺分析的基础上,总结和探讨了钴湿法冶炼工艺废水来源,并根据产生废水的工序分别介绍了钴湿法冶炼工艺废水产生量的估算方法,以及钴湿法冶炼工艺废水水质的推测方法。此废水水量水质估算方法同样适合于镍湿法冶炼工艺,也可作为铜、锌、稀土金属等湿法冶金工艺废水水量水质的估算参考。 相似文献
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高砷硫化铜精矿冶炼工艺研究 总被引:3,自引:0,他引:3
研究了单独处理含As05%以上硫化铜精矿的冶炼工艺,阐明了火法和湿法冶炼工艺处理此类精矿的可能性及存在问题。试验结果表明,湿法冶炼工艺处理高砷硫化铜精矿工艺本身是畅通的,能有效控制砷、硫有害气体对环境的污染,但存在着铜浸出率低和浸出渣有价金属回收困难等问题;火法冶炼工艺处理此类精矿,选择合理工艺参数能产出合格电铜和硫酸等冶炼产品,可有效控制砷对环境的污染,是工业处理高砷硫化铜精矿的可选工艺方案。 相似文献
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《中国有色冶金》2018,(6)
高炉粉尘中含有锌、铅等有价金属元素,其中锌以氧化锌形式存在,并且含量较大,具有回收价值。氧化锌回收包括火法冶炼和湿法冶炼:火法回收锌的方法包括回转窑法、转底炉法;湿法回收锌的方法有酸处理法、碱处理法和氨处理法。火法冶炼过程工艺成熟、应用广泛、处理能力强,但生产过程耗能大、碳排放高。三种湿法冶炼工艺均可实现较高的锌浸出率。酸法过程中,高浓度硫酸条件下处理效果较好,但经济性差;盐酸处理生成含有氯离子废液,浪费资源、污染环境。碱法浸出过程中由于加入硫化物除杂,引起有害气体排放,污染环境。氨法浸出会产生氨气外放及对铁酸锌等夹杂无法处理问题,降低了浸出效率。湿法回收锌的工艺前景广阔,但还有待完善,其中氨法回收具有较大潜力,应在提高回收效率的同时,注重工艺过程中氨气的回收,以及铁酸锌等不溶物的回收,以提升经济效益。 相似文献
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铜硫矿石中有用成分为铜、硫、金、银等矿物。铜、硫是以硫化矿状态存在 ,金、银矿物多呈包裹体状态存在于铜矿物中。混合浮选再磨分离流程强化了铜硫矿物的分离 ,可有效地提高铜回收率及伴生金银回收率。 相似文献
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根据锡电尘的性质和特点,提出Tz.段酸性浸出、P204萃取、盐酸反萃提铟新工艺,并进行了全流程的试验研究,明确了各工序的工艺技术条件。整个流程铟总回收率达到80%以上,其中锡电尘中铟的浸出率达85%,铟萃取过程中,得到品位在98%的粗铟。采用酸洗、草酸再生和定期碱洗等方法,解决了萃铟有机相老化问题。 相似文献
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在烟气制酸过程中,吸收塔入塔酸温过低在吸收过程中会生成酸雾,影响吸收效果,降低吸收率。通过对吸收塔泵槽出口管道进行改造,使制酸系统在单台炉窑作业烟气量小、SO2浓度低等条件吸收酸温度仍可控制在正常范围,保证吸收塔有较高吸收率。 相似文献
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丁华 《有色金属(冶炼部分)》2017,(3):49-53
对低气速填料塔,分酸均匀尤其重要。碟式分酸器的显著优点是分酸均匀、调节范围宽。以400kt/a烟气制酸装置为例,介绍了冷却塔和干吸塔碟式分酸器的设计参数和调节性能,冷却塔在于稀酸雾粒的均匀长大,减少喷淋密度对干燥和吸收效率均有利,细小雾粒的蒸发是干燥效率的控制步骤。减小塔底气液温差可相应减少吸收塔内化学酸雾。 相似文献
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低浓度二氧化硫烟气一直是困绕钼冶炼烟气治理的技术难题。通过对治理低浓度二氧化硫生产工艺实践与理论分析,以碳酸氢铵作为吸收剂,采用了亚铵法生产工艺流程并进行一系列改造,可实现生产过程连续稳定运行,尾气二氧化硫排放浓度能达到国家环保排放要求。 相似文献
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In this paper we report the cloning, sequencing and expression of the superoxide dismutase (sod) gene from Mycobacterium fortuitum. A single gene was found to code for superoxide dismutase activity with its identity being confirmed by expression in M. aurum. The amino acid sequence was found to be similar to that of superoxide dismutases of several other origins. A region downstream of the sod gene also showed similarities to the corresponding sequences of the two main mycobacterial pathogens: M. leprae and M. tuberculosis. Analysis of enzymatic activity showed this enzyme in M. fortuitum required manganese as cofactor. 相似文献
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富氧密闭鼓风炉加转炉炼铜烟气采用二转二吸制酸工艺,可解决-转-吸制酸存在的转化率低、尾气不能达标、需配套尾气吸收工序、制酸成本高等问题,但富氧炼铜烟气具有烟气量及SO2、CO浓度波动幅度大等特点,给二转二吸的顺利实现带来了困难.文章对富氧炼铜烟气采用二转二吸制酸工艺的可行性及若干技术问题作了探讨,提出了相应的对策. 相似文献
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It has been suggested that catalase-peroxidase plays an important role in several aspects of mycobacterial metabolism and is a virulence factor in the main pathogenic mycobacteria. In this investigation, we studied genes encoding for this protein in the fast-growing opportunistic pathogen Mycobacterium fortuitum. Nucleotide sequences of two different catalase-peroxidase genes (katGI and katGII) of M. fortuitum are described. They show only 64% homology at the nucleotide level and 55% identity at the amino acid level, and they are more similar to catalases-peroxidases from different bacteria, including mycobacteria, than to each other. Both proteins were found to be expressed in actively growing M. fortuitum, and both could also be expressed when transformed into Escherichia coli and M. aurum. We detected the presence of a copy of IS6100 in the neighboring region of a katG gene in the M. fortuitum strain in which this element was identified (strain FC1). The influence of each katG gene on isoniazid (isonicotinic acid hydrazide; INH) susceptibility of mycobacteria was checked by using the INH-sensitive M. aurum as the host. Resistance to INH was induced when katGI was transformed into INH-sensitive M. aurum, suggesting that this enzyme contributes to the natural resistance of M. fortuitum to the drug. This is the first report showing two different genes encoding same enzyme activity which are actively expressed within the same mycobacterial strain. 相似文献