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Nanosize-effect on the distribution of heavy metals in copper smelting dust:Based on sophisticated dust sorting approach

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Nano Research 2024年第1期17卷 312-320页

作者： Ken Li Zuwu Liao Hengdi Ye Qingzhu Li fenghua shen Qian Li Hui Liu Qingwei Wang Xu Yan Zhang Lin Liyuan Chai School of Metallurgy and Environment Central South UniversityChangsha 410083China Chinese National Engineering Research Center for Control&Treatment of Heavy Metal Pollution Changsha 410083China National Engineering Research Center of Sintering and Pelletizing Equipment System Zhongye Changtian International Engineering Co.LtdChangsha 410205China

Dust particles emitted from smelters can be hazardous to ecosystems and humans,as they are often enriched in metallic ***,we combined multi-method mineralogical analysis with a sophisticated size sorting approach for copper smelting dust to study the nanosize-effect on heavy metal distribution,which has hitherto been *** types of dust were collected from a copper flash smelter and then size-sorted using a Dekati low-pressure *** showed that all three samples could easily sort out nanoscale dust particles(<1μm,grades 10–2)and even those smaller than 100 nm(grades 5–2).Especially for electrostatic precipitators dust,the mass fraction of nanoscale dust(<1μm)could reach 10.71%.The presence of heavy metals(Pb,Zn,Cu,and As)and their mineral species in dust was examined at various particle *** was discovered that different heavy metals are enriched on nanoparticles in specific *** micron-sized particles,heavy metals are generally found in discrete phases(e.g.,CuSO_(4),PbSO_(4),and As_(2)O_(3)).In nanoscale particles,the dominant phase is Fe_(3)O_(4),while heavy metals are mostly found in lattice substitution(e.g.,CuFe_(2)O_(4)and ZnFe_(2)O_(4)).Two distinct nano-dust morphologies were found:One with irregular mesh or chain structures consisting of particles of a few nanometers,and the other with polygonal crystals in larger sizes of hundreds of *** enrichment of heavy metals in the latter morphology is more pronounced,possibly because lattice substitution of heavy metals is more likely to occur when polycrystalline particles are formed.

关键词： copper flue dust size-sorted heavy metal distribution morphology nano-sized effects

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Formation of sulfur oxide groups by SO_(2) and their roles in mercury adsorption on carbon-based materials

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Journal of Environmental Sciences 2022年第9期34卷 44-49页

作者： fenghua shen Shudan He Junyuan Li Cao Liu Kaisong Xiang Hui Liu School of Metallurgy and Environment Central South UniversityChangsha 410083China Chinese National Engineering Research Center for Control&Treatment of Heavy Metal Pollution Changsha 410083China School of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China

The presence of SO_(2) display significant effect on the mercury(Hg) adsorption ability of carbon-based sorbent. Yet the adsorption and oxidation of SO_(2) on carbon with oxygen group, as well as the roles of different sulfur oxide groups in Hg adsorption have heretofore been unclear. The formation of sulfur oxide groups by SO_(2) and their effects on Hg adsorption on carbon was detailed examined by the density functional theory. The results show that SO_(2) can be oxidized into SO_(2) by oxygen group on carbon surface. Both C-SO_(2) and C-SO_(2)can improve Hg adsorption on carbon site, while the promotive effect of C-SO_(2) is stronger than C-SO_(2). Electron density difference analyses reveal that sulfur oxide groups enhance the charge transfer ability of surface unsaturated carbon atom, thereby improving Hg adsorption. The experimental results confirm that surface active groups formed by SO_(2) adsorption is more active for Hg adsorption than the groups generated by SO_(2).

关键词： Sulfur dioxide Mercury Carbon sorbent Adsorption mechanism

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Systematic control technologies for gaseous pollutants from non-ferrous metallurgy

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Journal of Environmental Sciences 2023年第1期123卷 65-82页

作者： Hui Liu fenghua shen Qingzhu Li Minneng Wen Hongliang Zhang Linhua Jiang Chenghang Zheng Yan Liu Tao Liu Liyuan Chai School of Metallurgy and Environment Central South UniversityChangsha 410083China Chinese National Engineering Research Center for Control&Treatment of Heavy Metal Pollution Changsha 410083China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China College of Environmental Science and Engineering Tongji UniversityShanghai 200092China State Key Lab of Clean Energy Utilization State Environmental Protection Engineering Center for Coal-Fired Air Pollution ControlZhejiang UniversityHangzhou 310027China Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Ministry of Education School of MetallurgyNortheastern UniversityShenyang 110819China School of Resource and Environmental Engineering Wuhan University of Science and TechnologyWuhan 430081China

Air pollutant emissions represent a critical challenge in the green development of the non-ferrous metallurgy *** work studied the emission characteristics,formation mechanisms,phase transformation and separation of typical air pollutants,such as heavy metal particles,mercury,sulfur oxides and fluoride,during non-ferrous smelting.A series of purification technologies,including optimization of the furnace throat and hightemperature discharge,were developed to collaboratively control and recover fine particles from the flue gas of heavy metal smelting processes,including copper,lead and *** improvements have been realized in wet scrubbing technology for removing mercury,fluoride and SO_(2)from flue ***-liquid sulfidation technology by applying H_(2)S was invented to recycle the acid scrubbing wastewater more efficiently and in an eco-friendly *** on digital technology,a source reduction method was designed for sulfur and fluoride control during the whole aluminum electrolysis *** desulfurization technologies were developed for catalytic reduction of the sulfur content in petroleum coke at low temperature and catalytic reduction of SO_(2)to elemental *** work has established the technology for coupling multi-pollutant control and resource recovery from the flue gas from non-ferrous metallurgy,which provides the scientific theoretical basis and application technology for the treatment of air pollutants in the non-ferrous metallurgy industry.

关键词： Non-ferrous smelting Gaseous pollutant Flue gas purification Acid wastewater Heavy metal

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仿生微扑翼飞行器机翼结构力学特性分析

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兵器装备工程学报 2018年第10期39卷 54-57页

作者：沈锋华于纪言南京理工大学智能弹药国防重点学科实验室南京210094

基于蝙蝠的翼手结构,借鉴了对鸟类飞行的研究成果,建立了仿蝙蝠微扑翼飞行器机翼的折叠扑动模型。采用ansys软件对不同折叠角,翼展比,机翼厚度三种机翼参数的机翼模型进行了模态分析,然后对模态特性较好的一种机翼模型进行静力学特性分... 详细信息

基于蝙蝠的翼手结构,借鉴了对鸟类飞行的研究成果,建立了仿蝙蝠微扑翼飞行器机翼的折叠扑动模型。采用ansys软件对不同折叠角,翼展比,机翼厚度三种机翼参数的机翼模型进行了模态分析,然后对模态特性较好的一种机翼模型进行静力学特性分析及优化设计。

关键词：微扑翼飞行器仿生蝙蝠模态分析静力学特性分析

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中国大学生英语书面语中认识立场表达特征

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科教文汇 2014年第26期 102-103页

作者：申风华河南科技大学外国语学院河南洛阳471023

认识立场表达受认知、文化等因素的影响。由于认知、文化的差异以及英语知识的不足,中国学生在议论文写作中高频使用直接、显性的立场表达手段表达作者的认识与看法,而较少使用间接、隐性的表达手段,这构成了中国学习者英语书面语中认... 详细信息

认识立场表达受认知、文化等因素的影响。由于认知、文化的差异以及英语知识的不足,中国学生在议论文写作中高频使用直接、显性的立场表达手段表达作者的认识与看法,而较少使用间接、隐性的表达手段,这构成了中国学习者英语书面语中认识立场表达的重要特征。

关键词：认识立场隐性手段显性手段

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谷氨酰胺与L-肉碱对低温下肉仔鸡血液生化指标的影响

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中国动物检疫 2008年第3期25卷 35-36页

作者：申凤华李士泽黑龙江八一农垦大学动物科技学院大庆163319

本研究采用L16(45)正交试验设计,将480只9日龄AA肉仔鸡,随机分为16组,每组3个重复,探讨谷氨酰胺与L-肉碱对低温下肉仔鸡血液生化指标的影响。谷氨酰胺添加水平分别为0%、0.4%、0.6%、0.8%,L-肉碱添加水平分别为0mg/Kg、50mg/Kg、75mg/Kg... 详细信息

本研究采用L16(45)正交试验设计,将480只9日龄AA肉仔鸡,随机分为16组,每组3个重复,探讨谷氨酰胺与L-肉碱对低温下肉仔鸡血液生化指标的影响。谷氨酰胺添加水平分别为0%、0.4%、0.6%、0.8%,L-肉碱添加水平分别为0mg/Kg、50mg/Kg、75mg/Kg、100mg/Kg,试验期14d。试验结果表明:较正常饲养温度低4～5℃条件下,添加0.4%谷氨酰胺和100mg/KgL-肉碱显著提高低温暴露后第一周血清总蛋白含量(P<0.05),且显著降低低温暴露后第二周血清尿素氮含量(P<0.05),分别单独添加谷氨酰胺和肉碱对AA肉仔鸡血液生化指标没有显著影响。试验结果证实同时添加谷氨酰胺和肉碱可有效缓解低温应激对肉仔鸡的损害。0.4%谷氨酰胺和100mg/KgL-肉碱的效果最好。

关键词：谷氨酰胺 L-肉碱生化指标冷暴露

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硫化氢对碳基吸附汞的影响机理研究

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燃烧科学与技术 2014年第5期20卷 440-444页

作者：沈锋华刘晶屈文麒郑楚光华中科技大学煤燃烧国家重点实验室武汉430074

应用密度泛函理论B3PW91方法,计算了H2S在碳基固体表面的吸附结构和吸附能,并研究了单质汞在含硫碳基表面的吸附和HgS在碳基表面的吸附.研究结果表明,H2S倾向于解离吸附在碳基表面,属于较强的化学吸附.解离吸附形成的AC—S和AC—SH不直... 详细信息

应用密度泛函理论B3PW91方法,计算了H2S在碳基固体表面的吸附结构和吸附能,并研究了单质汞在含硫碳基表面的吸附和HgS在碳基表面的吸附.研究结果表明,H2S倾向于解离吸附在碳基表面,属于较强的化学吸附.解离吸附形成的AC—S和AC—SH不直接与单质汞反应,但碳基表面S的存在会增加邻近吸附位的吸附活性,从而增强了碳基对汞的吸附能力,使其更倾向于化学吸附.HgS在碳基表面的吸附形式有解离吸附和非解离吸附,其中平行位解离吸附是主要的吸附形式.

关键词：汞碳基吸附剂硫化氢吸附密度泛函理论

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煤气化过程砷释放的在线监测及动力学特性

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燃烧科学与技术 2018年第2期24卷 165-169页

作者：沈锋华张保华刘晶张振张志潮华中科技大学煤燃烧国家重点实验室武汉430074 广东韶能集团股份有限公司韶关512026

采用烟气痕量元素在线监测方法研究了煤气化过程中砷的释放动力学特性.该方法基于ICP-OES技术,用于连续定量测量烟气中痕量元素的瞬时质量浓度.烟气中砷的质量浓度随反应温度的改变发生明显变化,表明温度对砷的迁移转化有显著影响.根据... 详细信息

采用烟气痕量元素在线监测方法研究了煤气化过程中砷的释放动力学特性.该方法基于ICP-OES技术,用于连续定量测量烟气中痕量元素的瞬时质量浓度.烟气中砷的质量浓度随反应温度的改变发生明显变化,表明温度对砷的迁移转化有显著影响.根据在线监测结果求取砷的释放速率,建立煤气化过程中砷释放的动力学方程,并包含温度的影响.采用热力学方法研究了煤气化过程中砷的形态和分布,砷可与飞灰中的CaO反应生成Ca(AsO_2)_2,使砷由气相迁移到固相中.

关键词：砷释放动力学在线监测煤气化

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