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硫的发展与应用
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作者 范巧玲 姜雪峰 《化学教育(中英文)》 CAS 北大核心 2019年第1期2-6,共5页
硫是一种非金属元素,属于氧族元素(ⅥA族)。硫的发现和使用具有悠久的历史,现代化学中含硫生命分子、含硫药物、含硫材料、精细化学品等都十分普遍。从硫元素的发展历史出发,逐步介绍硫化学在人类生活中的重要用途。重点介绍当代硫化学... 硫是一种非金属元素,属于氧族元素(ⅥA族)。硫的发现和使用具有悠久的历史,现代化学中含硫生命分子、含硫药物、含硫材料、精细化学品等都十分普遍。从硫元素的发展历史出发,逐步介绍硫化学在人类生活中的重要用途。重点介绍当代硫化学在生命功能、药物作用、食品和有机光电材料中的重要用途,尤其是生活中常见的含硫药物、含硫食品和含硫材料的主要成分以及它们独特性质的化学本源。 展开更多
关键词 硫元素 含硫分子 含硫药物 含硫材料
冶金焦炭硫形态及其对高炉煤气硫的影响 预览
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作者 张文成 张小勇 郑明东 《冶金能源》 2019年第2期55-59,共5页
通过对10种冶金焦炭的分析,探讨焦炭全硫分、焦炭不同形态硫分和焦炭表面吸附硫分对高炉煤气含硫的影响。试验结果表明10种冶金焦炭的全硫为0.66%~0.81%,焦炭全硫与高炉煤气含硫没有明显的关系;冶金焦炭中包括无机硫和有机硫,有机硫又... 通过对10种冶金焦炭的分析,探讨焦炭全硫分、焦炭不同形态硫分和焦炭表面吸附硫分对高炉煤气含硫的影响。试验结果表明10种冶金焦炭的全硫为0.66%~0.81%,焦炭全硫与高炉煤气含硫没有明显的关系;冶金焦炭中包括无机硫和有机硫,有机硫又分为噻吩、砜和亚砜,噻吩类硫占比为20.05%~53.84%;亚砜类15.28%~26.14%;砜类2.91%~34.92%;无机硫10.1%~34.66%。焦炭中噻吩、砜和亚砜等有机硫、焦炭无机硫与高炉煤气含硫关系不明显。随着焦炭中噻吩硫增加,无机硫下降,高炉煤气含硫增加。焦炭的表面附着硫大部分都集中在0.008%~0.015%之间。理论计算表明0.01%的焦炭表面附着硫相当于高炉煤气中硫量增加23.91mg/m^3。高炉生产实践表明0.01%的硫对高炉煤气的影响在20~30mg/m^3。要控制高炉煤气的硫在87mg/m^3,焦炭吸附硫以小于0.01%为宜。 展开更多
关键词 焦炭 硫分 有机硫 无机硫 高炉煤气
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Graphene/RuO2 nanocrystal composites as sulfur host for lithium-sulfur batteries 预览
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作者 Jian-Qiu Huang Jiaqiang Huang +4 位作者 Woon Gie Chong Jiang Cui Shanshan Yao Baoling Huang Jang-Kyo Kim 《能源化学:英文版》 SCIE EI CAS CSCD 2019年第8期204-211,I0007共9页
An optimized graphene/RuO2/S composite is prepared by hydrothermal growth of RuO2 particles on graphene oxide sheets as the positive electrode for rechargeable lithium-sulfur batteries. The electrode with 6.1 wt% RuO2... An optimized graphene/RuO2/S composite is prepared by hydrothermal growth of RuO2 particles on graphene oxide sheets as the positive electrode for rechargeable lithium-sulfur batteries. The electrode with 6.1 wt% RuO2 nanocrystals and a high sulfur content of 79.0 wt% delivers an optimal electrochemical performance with high residual capacities of 508 mAh g-1 after 200 cycles and 389 m Ah g-1 after800 cycles at 1 C with a low capacity decay of 0.054%. The RuO2 nanocrystals promote the redox reaction kinetics and facilitate the transformation of sulfur chemistry, leading to large improvements in reversibility and rate capability of the composite electrode. The density functional theory calculations signify the formation of Li–O and Ru–S bonds through chemical interactions between RuO2 and Li polysulfides while the adsorption energies between graphene and polysulfide species are much higher in the presence of RuO2 than that of the neat graphene acting alone. These discoveries support the efficient entrapment of polysulfides by the composite electrode to the benefit of enhanced cyclic stability of the battery. 展开更多
关键词 Enhanced redox reaction kinetics POLYSULFIDE adsorption Density functional theory LITHIUM SULFUR BATTERIES High SULFUR content
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新疆准东煤田硫分分布特征 预览
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作者 周剑 张熙 《煤质技术》 2019年第1期54-57,共4页
为了更好地开发与利用准东煤田的煤炭资源,采集准东煤田5个矿区的31个样品并测定其全硫和各种形态的硫含量,研究不同矿区、不同埋藏深度、不同岩相中的硫分布特征,并通过筛分和浮沉试验以分析硫分在各粒度级的分布特征及浮选特性。研究... 为了更好地开发与利用准东煤田的煤炭资源,采集准东煤田5个矿区的31个样品并测定其全硫和各种形态的硫含量,研究不同矿区、不同埋藏深度、不同岩相中的硫分布特征,并通过筛分和浮沉试验以分析硫分在各粒度级的分布特征及浮选特性。研究结果表明,准东煤田主采煤层的硫分以硫化铁硫为主,硫化物矿物主要存在于惰质组中,硫分随煤粒度逐渐变小而增大;硫分不能通过洗选而有效降低,独立或析出的硫化物矿物易分离。 展开更多
关键词 准东煤田 硫分 分布特征 硫化铁硫 岩相 惰质组 粒度 硫化物矿物
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硒硫互作对烤烟生理指标影响的研究进展 预览
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作者 朱金峰 王发展 熊亚南 《安徽农业科学》 CAS 2019年第3期19-21,共3页
硒元素是人体生长发育中所必需的微量元素,因此人们多通过农作措施生产富硒农产品,从而增加人体对硒的摄入。综述了近年来硒硫互作对烤烟矿质元素吸收积累以及叶绿素含量的影响,以期为富硒烟叶生产、合理地调控硫元素含量以及工业上高... 硒元素是人体生长发育中所必需的微量元素,因此人们多通过农作措施生产富硒农产品,从而增加人体对硒的摄入。综述了近年来硒硫互作对烤烟矿质元素吸收积累以及叶绿素含量的影响,以期为富硒烟叶生产、合理地调控硫元素含量以及工业上高品质、高安全性的卷烟生产提供参考依据。 展开更多
关键词 硒元素 硫元素 硒硫互作 富硒烟叶
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硅对高频燃烧红外吸收法测定高硅样品中碳和硫的影响 预览
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作者 任维萍 《冶金分析》 CAS 北大核心 2019年第3期21-25,共5页
利用扫描电镜(SEM)和能谱仪(EDS)观测了经高频感应炉燃烧后高硅样品熔体中硅的存在形态和组成,从不同角度考察了样品中硅对熔融效果产生的影响,以及对高频感燃烧红外吸收法测定碳和硫结果的影响。结果显示:仅使用纯钨做助熔剂时,含硅样... 利用扫描电镜(SEM)和能谱仪(EDS)观测了经高频感应炉燃烧后高硅样品熔体中硅的存在形态和组成,从不同角度考察了样品中硅对熔融效果产生的影响,以及对高频感燃烧红外吸收法测定碳和硫结果的影响。结果显示:仅使用纯钨做助熔剂时,含硅样品熔体中的硅主要以球状的二氧化硅颗粒镶嵌于氧化钨和氧化铁等基体中,硅的存在使得高频燃烧红外吸收法测定碳和硫的准确度变差,且随着样品中硅含量的增加,这种影响的程度逐步增大。通过对影响机理进行分析认为:生成的二氧化硅使得熔体的流动性变差,且接受电磁感应形成感应电流的能力也同时减弱,从而对测定结果的精密度和正确度造成影响。实验在使用钨助熔剂的基础上,进行了添加纯锡或纯铁助熔剂的试验,结果表明:添加一定量纯锡或纯铁助熔剂,可以降低样品熔点,提高熔池温度,大大改善熔融效果,从而提高碳和硫测定的精密度和正确度。 展开更多
关键词 高频燃烧红外吸收法 扫描电镜 能谱仪
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Simultaneous removal of hydrogen sulfide and volatile organic sulfur compounds in off-gas mixture from a wastewater treatment plant using a two-stage bio-trickling filter system
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作者 Shihao Sun Tipei Jia +2 位作者 Kaiqi Chen Yongzhen Peng Liang Zhang 《环境科学与工程前沿(英文)》 SCIE EI CAS CSCD 2019年第4期153-165,共13页
Simultaneous removal of hydrogen sulfide (H2S) and volatile organic sulfur compounds (VOSCs) in off-gas mixture from a wastewater treatment plant (WWTP) is difficult due to the occasional inhibitory effects of H2S on ... Simultaneous removal of hydrogen sulfide (H2S) and volatile organic sulfur compounds (VOSCs) in off-gas mixture from a wastewater treatment plant (WWTP) is difficult due to the occasional inhibitory effects of H2S on VOSC degradation. In this study, a two-stage bio-trickling filter (BTF) system was developed to treat off-gas mixture from a real WWTP facility. At an empty bed retention time of 40 s, removal efficiencies of H2S, methanethiol, dimethyl sulfide, and dimethyl disulfide were 90.1, 88.4, 85.8 and 61.8%, respectively. Furthermore, the effect of lifting load shock on system performance was investigated and results indicated that removal of both H2S and VOSCs was slightly affected. Illumina Miseq sequencing revealed that the microbial community of first-stage BTF contained high abundance of H2S-affinity genera including Acidithiobacillus (51.43%), Metallibacterium (25.35%), and Thionomas (8.08%). Analysis of mechanism demonstrated that first stage of BTF removed 86.1% of H2S, mitigating the suppression on VOSC degradation in second stage of BTF. Overall, the twostage BTF system, an innovative bioprocess, can simultaneously remove H2S and VOSC. 展开更多
关键词 Odor TWO-STAGE bio-trickling FILTER process Bio-trickling FILTER Hydrogen sulfide VOLATILE organic sulfur compound
电感耦合等离子体原子发射光谱法(ICP-OES)测定粗硒中的硫量 预览
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作者 万双 吕广颖 +1 位作者 兰福荫 李先和 《山东化工》 CAS 2019年第18期74-75,79共3页
粗硒样品经盐酸、硝酸消解,在硫标准溶液中加入硒溶液做基体匹配建立工作曲线,采用电感耦合等离子体原子发射光谱法(ICP-OES)测定粗硒中的硫量。通过实验选择了硫的最佳分析谱线及仪器工作参数,并对基体干扰影响进行了实验。在选定的实... 粗硒样品经盐酸、硝酸消解,在硫标准溶液中加入硒溶液做基体匹配建立工作曲线,采用电感耦合等离子体原子发射光谱法(ICP-OES)测定粗硒中的硫量。通过实验选择了硫的最佳分析谱线及仪器工作参数,并对基体干扰影响进行了实验。在选定的实验条件下,硫的方法检出限为0.0215μg/mL,测定下限为0.086μg/mL。方法的加标回收率在97.8%~103.5%之间,精密度(RSD)小于1.334%。完全满足粗硒生产工艺指标控制以及贸易结算的要求。 展开更多
关键词 电感耦合等离子体发射光谱法(ICP-OES) 粗硒
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Sulfur distribution in preparation of high titanium ferroalloy by thermite method with different CaO additions
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作者 Chu Cheng Zhi-He Dou +4 位作者 Ting-An Zhang Jian-Ming Su Hui-Jie Zhang Yan Liu Li-Ping Niu 《稀有金属:英文版》 SCIE EI CAS CSCD 2019年第8期793-799,共7页
Ferrotitanium is used as a deoxidizer and alloying agent during steelmaking process,which has a high demand for sulfur control.Sulfur was introduced from raw materials in the process of producing ferrotitanium by ther... Ferrotitanium is used as a deoxidizer and alloying agent during steelmaking process,which has a high demand for sulfur control.Sulfur was introduced from raw materials in the process of producing ferrotitanium by thermite method,where CaO was used as fluxing agent.At the same time,CaO has a great desulfurization capability.Effects of CaO addition on the distribution of sulfur in high titanium ferroalloy prepared by thermite method were studied in this work.The equilibrium diagram of Ti-AlFe-S system was calculated by FactSage 6.4 software package with FactPS and FTmisc database.The alloy and slag samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),inductively coupled plasma atomic emission spectrometer(ICP-AES),X-ray fluorescence(XRF)and high-frequency infrared ray carbon sulfur analyzer.The result indicates that the sulfur in the alloy firstly exists in the form of liquid FeS,thereafter TiS(s)and eventually Ti2 S(s)during cooling.The sulfur is mainly distributed in the alloy,and only a small amount of sulfur remains in the slag.Moreover,it is noted that the sulfur in the alloy does not distribute homogeneously,and it exists in the form of solid solution phase,(Ti,Al,Fe)S.S content in the slag,the sulfur capacity of the slag and the sulfur distribution ratio(LS)all increase with the increment of CaO addition,while S content in alloys decreases. 展开更多
关键词 DESULFURIZATION Sulfur partition ratio Optical BASICITY High titanium FERROALLOY THERMITE METHOD
A direct H2O2 production based on hollow porous carbon sphere-sulfur nanocrystal composites by confinement effect as oxygen reduction electrocatalysts
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作者 Guanyu Chen Jiwei Liu +5 位作者 Qingqing Li Pengfei Guan Xuefeng Yu Linshen Xing Jie Zhang Renchao Che 《纳米研究:英文版》 SCIE EI CAS CSCD 2019年第10期2614-2622,共9页
Carbon-sulfur composites have draw n in creasing interest in various fields including electrocatalysis because of their unique structures.However,carb on-sulfur composite with tiny sulfur nano crystals has still recei... Carbon-sulfur composites have draw n in creasing interest in various fields including electrocatalysis because of their unique structures.However,carb on-sulfur composite with tiny sulfur nano crystals has still received little attention.Herein,hollow porous carb on sphere-sulfur composite(HPCS-S)which possesses excellent electrochemical performance towards H2O2 has been prepared for the first time via a simple silica template method.The 2-5 nm sulfur nan ocrystals being restricted in the cha nnel of the hollow porous carb on spheres are un der a strong compressive stress,which was further con firmed by high-resoluti on tran smissi on electr on microscopy(HRTEM)and GPA.The HPCS-S nano crystals show better con ductivity tha n amorphous sulfur clusters because of the reducti on of the steric hindrance which efficie ntly promotes the electron transportation.Consequently,the higher activity and selectivity towards the 2e~oxygen reduction reaction(ORR)to H2O2 in alkaline solution was obtained.The H2O2 selectivity rises from 20%to over 70%after the sulfur addition and the H2O2 production rate achieves 183.99 mmol-gcataiyst-1 with the Faradaic efficiency of 70%.Furthermore,performance enhancement mechanism was also investigated using the den sity functional theory(DFT)calculatio ns.After the in troduci ng of sulfur nano crystals,the appeara nee of S-S bond greatly decreases the overpotential compared with S-doping,which results in significant enhancement of the electrocatalytic property.Consequently,the HPCS-S can be an efficient H2O2 production electrocatalyst in alkaline solution. 展开更多
关键词 SULFUR nanocrystal hydrogen PEROXIDE PRODUCTION carbon SPHERE oxygen reduction reaction
Timing and Source of the Hermyingyi W-Sn Deposit in Southern Myanmar, SE Asia: Evidence from Molybdenite Re-Os Age and Sulfur Isotopic Composition
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作者 Hai Jiang Shao-Yong Jiang +1 位作者 Wenqian Li Kuidong Zhao 《地球科学学刊:英文版》 SCIE CAS CSCD 2019年第1期70-79,共10页
The Hermyingyi W-Sn deposit, situated in southern Myanmar, SE Asia, is a typical quartz-vein type W-Sn deposit. The ore-bearing quartz veins are mainly hosted by the Hermyingyi monzogranite which intruded into the Car... The Hermyingyi W-Sn deposit, situated in southern Myanmar, SE Asia, is a typical quartz-vein type W-Sn deposit. The ore-bearing quartz veins are mainly hosted by the Hermyingyi monzogranite which intruded into the Carboniferous metasedimentary rocks of Mergui Series. According to mineral assemblages and crosscutting relationships, four ore-forming stages are recognized:(1) silicate-oxide stage;(2) quartz-sulfide stage;(3) barren quartz vein stage;(4) supergene stage. Five molybdenite samples from the deposit yield Re-Os model ages ranging from 67.8±1.6 to 69.2±1.6 Ma(weighted mean age of 68.7±1.2 Ma), and a well-defined isochron age of 68.4±2.5 Ma(MSWD=0.18, 2σ). This Re-Os age is consistent with the previously published zircon U-Pb age of the Hermyingyi monzogranite(70.0±0.4 Ma)(MSWD=0.9, 2σ) within errors, which indicates a genetic link between the monzogranitic magmatism and W-Sn mineralization. The new high-precision geochronological data reveal that the granitic magmatism and associated W-Sn mineralization in southern Myanmar took place during the Late Cretaceous(70–68 Ma). The extremely low Re contents(22.9 ppb to 299 ppb) in molybdenite, coupled with sulfide δ34S values in the range of +1.9‰ to +5.6‰ suggest that ore-forming metals were predominately sourced from the crustal-derived granitic magma. 展开更多
关键词 Hermyingyi W-Sn deposit MOLYBDENITE RE-OS DATING sulfur ISOTOPES Myanmar SE Asia
The Principle of Detect SO2 Concentration by Using the Electrochemical Method in Ionic Liquid
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作者 HUANG Qing HU Yang +2 位作者 WANG Jiakai JIANG Kai WU Tian 《武汉大学学报:自然科学英文版》 CAS CSCD 2019年第5期400-404,共5页
The reduction of SO2 with different concentrations at a platinum microelectrode was investigated by cyclic voltammetry(CV) in 1-(butyl)-3-methylimidazolium hexafluorophosphate([Bmim]PF6). We speculated that the reacti... The reduction of SO2 with different concentrations at a platinum microelectrode was investigated by cyclic voltammetry(CV) in 1-(butyl)-3-methylimidazolium hexafluorophosphate([Bmim]PF6). We speculated that the reaction mechanism of reduction may form a macromolecular complex, and the higher the concentration of SO2, the larger the molecular weight of the complex. The higher the concentration of SO2, the greater the diffusion coefficient of SO2 in [Bmim]PF6. There is a good quadratic function relationship between the reduction peak current and SO2 concentrations in the range from 2% to 100%, which promises a kind of ionic liquid electrolyte for the detection of SO2 gas with a wide range of concentrations. 展开更多
关键词 IONIC liquids SULFUR dioxide cyclic VOLTAMMETRY chronoamperometric
Study of neutron production and moderation for sulfur neutron capture therapy 预览
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作者 Meng Peng Guo-Zhu He +3 位作者 Qi-Wei Zhang Bin Shi Hong-Qing Tang Zu-Ying Zhou 《核技术:英文版》 SCIE CAS CSCD 2019年第1期59-66,共8页
Neutron capture therapy with Sulfur-33, similar to boron neutron capture therapy with Boron-10, is effective in treating some types of tumors including ocular melanoma. The key point in sulfur neutron capture therapy ... Neutron capture therapy with Sulfur-33, similar to boron neutron capture therapy with Boron-10, is effective in treating some types of tumors including ocular melanoma. The key point in sulfur neutron capture therapy is whether the neutron beam flux and the resonance capture cross section of 33S(n;α)30 Si reaction at 13.5 keV can achieve the requirements of radiotherapy. In this research,the authors investigated the production of 13.5 keV neutron production and moderation based on an accelerator neutron source. A lithium glass detector was used to measure the neutron flux produced via near threshold7 Li(p,n)7 Be reaction using the time-of-flight method. Furthermore, the moderation effects of different kinds of materials were investigated using Monte Carlo simulation. 展开更多
关键词 SULFUR NEUTRON CAPTURE THERAPY BORON NEUTRON CAPTURE THERAPY 33S(n α)3 Si resonance reaction 7Li(p n)^7 Be NEUTRON source
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闽江口互花米草淤积作用对其自身和短叶茳芏残体分解及硫养分释放的影响 预览
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作者 王杰 孙志高 +3 位作者 何涛 高会 王华 李晓 《生态学报》 CAS CSCD 北大核心 2019年第10期3631-3642,共12页
2016—2017年,以闽江口鳝鱼滩西北部互花米草(SA)入侵初期与短叶茳芏(CM)形成的典型交错带植物残体为研究对象,基于野外原位分解试验,通过设定无淤积强度(S0,0cm/a)、当前淤积强度(S5,5cm/a)和未来淤积增强(S10,10cm/a)3种处理,模拟互... 2016—2017年,以闽江口鳝鱼滩西北部互花米草(SA)入侵初期与短叶茳芏(CM)形成的典型交错带植物残体为研究对象,基于野外原位分解试验,通过设定无淤积强度(S0,0cm/a)、当前淤积强度(S5,5cm/a)和未来淤积增强(S10,10cm/a)3种处理,模拟互花米草入侵初期导致的淤积作用对其自身以及短叶茳芏残体分解及硫养分释放的影响。结果表明,随着互花米草入侵导致的淤积强度的增加,互花米草和短叶茳芏残体的分解速率均明显降低;与S0相比,二者在S5与S10处理下的分解速率分别降低49.09%(SA)、35.14%(CM)和56.36%(SA)、44.59%(CM)。随着淤积强度的增加,互花米草和短叶茳芏残体分解过程中的TS含量整体均呈增加趋势,且其对短叶茳芏TS含量变化的影响较为明显;互花米草和短叶茳芏残体在分解过程中均表现为不同程度的硫释放,但随淤积强度的增加,二者硫释放量均呈降低趋势,且在相同淤积强度下,前者的硫释放量要高于后者。不同淤积强度下残体分解速率及硫养分释放强度的差异不仅与分解环境中的EC密切相关,且与残体残留率、初始基质质量(C/N和C/S)以及淤积导致养分条件改变而对分解过程中残体基质质量的影响有关。研究发现,随着淤积强度的增加,两种残体的分解速率及硫释放强度均降低;但在相同淤积强度下,短叶茳芏残体的分解速率和硫释放量均大于互花米草。 展开更多
关键词 残体分解 淤积作用 潮滩湿地 闽江河口
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硫对镍基合金825(100)电子结构影响的密度泛函研究 预览
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作者 范舟 黄泰愚 刘建仪 《材料导报》 EI CAS CSCD 北大核心 2019年第A01期332-336,共5页
由于硫在镍基合金表面易产生点蚀,基于密度泛函理论,利用软件对镍基合金825表面吸附元素硫进行了计算,研究了硫对合金表面电子结构及耐蚀性的影响。研究表明,S在合金825面心立方晶胞(100)Ni/Fe终止面上的H位吸附能达到-6.51eV,相互作用... 由于硫在镍基合金表面易产生点蚀,基于密度泛函理论,利用软件对镍基合金825表面吸附元素硫进行了计算,研究了硫对合金表面电子结构及耐蚀性的影响。研究表明,S在合金825面心立方晶胞(100)Ni/Fe终止面上的H位吸附能达到-6.51eV,相互作用较强且稳定吸附;S在合金(100)面的吸附主要是由S-3p轨道与Fe-3d轨道以及第二层Cr-3d轨道杂化引起;综合分析电子态密度、电荷布居、差分电荷密度,硫在合金(100)面吸附后电子态呈扩散趋势,活性增加,带负电,Ni-S间的弱耦合作用阻碍了Fe-S成键,Ni的存在提高了合金的耐蚀性;当S覆盖度从0.25ML升高到1.0ML时,在0.5ML附近S与合金的相互作用达到极大,在1.0ML附近时相邻S原子间的耦合和杂化阻碍了S在(100)面上的吸附。 展开更多
关键词 镍基合金 吸附 电子结构 DFT
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影响煤炭发热量测量的常见因素分析 预览
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作者 郝飞 《煤质技术》 2019年第5期61-64,共4页
分析水分、碳含量、灰分和硫分对煤炭发热量测定的影响,并制备煤样开展试验分析。通过试验测定不同影响因素对煤炭发热量的影响程度,收集和分析试验数据并绘制影响曲线,分别拟合水分含量、碳含量、灰分和硫分与发热量的线性关系。由分... 分析水分、碳含量、灰分和硫分对煤炭发热量测定的影响,并制备煤样开展试验分析。通过试验测定不同影响因素对煤炭发热量的影响程度,收集和分析试验数据并绘制影响曲线,分别拟合水分含量、碳含量、灰分和硫分与发热量的线性关系。由分析可知:煤炭发热量随着水分和灰分比例的增加而降低;碳含量对煤炭发热量的影响最大,前期随着碳含量增加则发热量不断增加,但碳含量超过一定范围(70%~80%)则发热量反而降低;硫分对煤炭发热量测定的影响相对较小。 展开更多
关键词 煤炭 发热量 影响因素 硫分 灰分 线性关系
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施硫对甜荞生长发育和产量及籽粒总黄酮含量的影响 预览
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作者 宋丽芳 杨晨波 +4 位作者 郭琪 史晓倩 王子轩 郝爽楠 宋晓彦 《山西农业科学》 2019年第8期1371-1374,共4页
为了研究施硫对甜荞生长发育和产量及籽粒总黄酮含量的影响,通过盆栽试验对甜荞基施5个质量分数(0,20,40,80,160mg/kg)的硫酸钠,分析甜荞在分枝期、开花初期、开花盛期和成熟期的地上干生物量、SPAD值及成熟期千粒质量、籽粒产量和籽粒... 为了研究施硫对甜荞生长发育和产量及籽粒总黄酮含量的影响,通过盆栽试验对甜荞基施5个质量分数(0,20,40,80,160mg/kg)的硫酸钠,分析甜荞在分枝期、开花初期、开花盛期和成熟期的地上干生物量、SPAD值及成熟期千粒质量、籽粒产量和籽粒总黄酮含量。结果表明,甜荞的地上干生物量、SPAD值、千粒质量及籽粒产量在S2(40mg/kg)处理下达到最大值;籽粒总黄酮含量在S3(80mg/kg)处理下达到最大值,S2处理次之。综合所有指标可知,基施40mg/kg硫酸钠既可以促进甜荞生长、提高千粒质量及产量,也可以提高籽粒总黄酮含量。 展开更多
关键词 甜荞 籽粒产量 籽粒总黄酮含量
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Genesis of the Bianjiadayuan PbeZn polymetallic deposit,Inner Mongolia,China: Constraints from in-situ sulfur isotope and trace element geochemistry of pyrite 预览
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作者 Kai-Rui Song Li Tang +7 位作者 Shou-Ting Zhang M. Santosh Christopher J. Spencer Yu Zhao Hao-Xing Li Liang Wang An-Li Zhang Yin-Qiang Sun 《地学前缘:英文版》 CAS CSCD 2019年第5期1863-1877,共15页
The Southern Great Xing’an Range (SGXR) which forms part of the eastern segment of the Central Asian Orogenic Belt (CAOB) is known as one of the most important Cu-Mo-Pb-Zn-Ag-Au metallogenic belts in China,hosting a ... The Southern Great Xing’an Range (SGXR) which forms part of the eastern segment of the Central Asian Orogenic Belt (CAOB) is known as one of the most important Cu-Mo-Pb-Zn-Ag-Au metallogenic belts in China,hosting a number of porphyry Mo (Cu),skarn Fe (Sn),epithermal Au-Ag,and hydrothermal veintype Ag-Pb-Zn ore deposits.Here we investigate the Bianjiadayuan hydrothermal vein-type Ag-Pb-Zn ore deposit in the southern part of the SGXR.Porphyry Sn ±Cu ± Mo mineralization is also developed to the west of the Ag-Pb-Zn veins in the ore field.We identify a five-stage mineralization process based on field and petrologic studies including (i) the early porphyry mineralization stage,(ii) main porphyry mineralization stage,(iii) transition mineralization stage,(iv) vein-type mineralization stage and (v) late mineralization stage.Pyrite is the predominant sulfide mineral in all stages except in the late mineralization stage,and we identify corresponding four types of pyrites: Py1 is medium-grained subhedral to euhedral occurring in the early barren quartz vein;Py2 is medium- to fine-grained euhedral pyrite mainly coexisting with molybdenite,chalcopyrite,minor sphalerite and galena;Py3 is fine-grained,subhedral to irregular pyrite and displays cataclastic textures with micro-fractures;Py4 occurs as euhedral microcrystals and forms irregularly shaped aggregate with sphalerite and galena.LA-ICP-MS trace element analyses of pyrite show that Cu,Pb,Zn,Ag,Sn,Cd and Sb are partitioned into pyrite as structurally bound metals or mineral micro/nano-inclusions,whereas Co,Ni,As and Se enter the lattice via isomorphism in all types of pyrite.The Cu,Zn,Ag,Cd concentrations gradually increase from Py1 to Py4,which we correlate with cooling and mixing of ore-forming fluid with meteoric water.Py2 contains the highest contents of Co,Ni,Se,Te and Bi,suggesting high temperature conditions for the porphyry mineralization stage.Ratios of Co/Ni (0.03-10.79,average 2.13) and sulphur isotope composition of sulfide indicate typical hydrothermal o 展开更多
关键词 Trace elements IN-SITU sulfur ISOTOPE PYRITE Bianjiadayuan deposit SOUTHERN Great Xing'an range
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10MWth高硫石油焦化学链气化制合成气耦合硫磺回收新系统模拟研究 预览
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作者 王璐璐 宋涛 +2 位作者 张将 段媛媛 沈来宏 《化工学报》 EI CAS CSCD 北大核心 2019年第6期2279-2288,F0002共11页
基于化学链气化技术依靠气固反应定向调控气化产物中H2S和SO2摩尔比为2的优势,将化学链气化与Claus工艺中的催化转化单元相结合,提出了高硫石油焦化学链气化制合成气和回收硫磺的新系统。针对系统核心单元,即化学链气化过程,基于Aspen P... 基于化学链气化技术依靠气固反应定向调控气化产物中H2S和SO2摩尔比为2的优势,将化学链气化与Claus工艺中的催化转化单元相结合,提出了高硫石油焦化学链气化制合成气和回收硫磺的新系统。针对系统核心单元,即化学链气化过程,基于Aspen Plus,开展热输入10 MWth的高硫石油焦化学链气化过程模拟,以赤铁矿石为载氧体,水蒸气为气化介质,重点考察了氧碳比、气化温度对化学链气化过程及硫转化过程的影响。结果发现,氧碳比的增大导致合成气产率显著降低,但系统从需要外部提供能量逐渐转变为对外部放热,在氧碳比0.8669~0.9535区间内,系统可以达到热量自平衡。同时,气化温度的提高对合成气产率是有利的,在975℃时达到2.15 m^3/kg,主要是由于CO体积分数随气化温度增加而增加。氧碳比和气化温度的提高都会导致H2S浓度的降低和SO2浓度的提高。并且研究了当H2S和SO2摩尔比为2的最佳工况时,氧碳比和气化温度为反相关,其中氧碳比为0.8669,气化温度为900℃时,冷煤气效率为64.09%。 展开更多
关键词 载氧体 化学链气化 石油焦 硫磺 模拟
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高频燃烧红外吸收法测定氧化铁皮中的硫含量 预览
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作者 张庆建 张晓敏 +4 位作者 管嵩 丁仕兵 赵祖亮 刘俊 萧达辉 《冶金能源》 2019年第4期51-53,共3页
采用高频感应炉燃烧红外吸收碳硫仪,建立了氧化铁皮中硫含量的测定方法。实验确定了氧化铁皮中硫含量测定的最佳条件:最大板极电流175mA,助熔剂的选择及加入方式为纯铁+试样+钨锡助熔剂,称样量为0.5g;比较水平为2.0%;最短分析时间为40s... 采用高频感应炉燃烧红外吸收碳硫仪,建立了氧化铁皮中硫含量的测定方法。实验确定了氧化铁皮中硫含量测定的最佳条件:最大板极电流175mA,助熔剂的选择及加入方式为纯铁+试样+钨锡助熔剂,称样量为0.5g;比较水平为2.0%;最短分析时间为40s。用2个磁铁矿标准物质对准确性进行验证,分析值和标准值没有显著性差异。对5个氧化铁皮样品分别测定7次,相对标准偏差为0.97%~2.09%,能够满足氧化铁皮中硫含量的检测需求。 展开更多
关键词 氧化铁皮 高频燃烧红外吸收法
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