检索结果-南通市图书馆

Journal of central South University 2014年第8期21卷 3233-3240页

作者：左勇刚张利波彭金辉 c.srinivasakannan 刘秉国马爱元 Yunnan Provincial Key Laboratory of Intensification Metallurgy(Kunming University of Science and Technology) Key Laboratory of Unconventional Metallurgy Ministry of Education(Kunming University of Science and Technology) Faculty of Metallurgy and Energy Engineering Kunming University of Science and Technology chemical Engineering Program The Petroleum InstituteP.O.Box 2533Abu DhabiUnited Arab Emirates

The technology that waste activated carbon after extracting gold is regenerated with steam under microwave heating was studied. The influence of the activation temperature, activation duration and steam flow rate on iodine adsorption value and regeneration yield of activated carbon was investigated. The response surface methodology （RSM） technique was utilized to optimize the process conditions. The optimum conditions for the preparation of activated carbon are identified to be activation temperature of 831 ℃, activation duration of 40 min and steam flow rate of 2.67 mL/min. The optimum conditions result in an activated carbon with an iodine number of 1048 mg/g and a yield of 40%, and the BET surface area evaluated using nitrogen adsorption isotherm is 1493 m2/g, with total pore volume of 1.242 cm3/g. And the pore structure of activated carbon regenerated is mainly composed of micropores and a small amount of mesopores.

关键词： microwave heating steam waste activated carbon extracting response surface methodology

Preparation of microsized hematite powder from ferrous sulfate via microwave calcination

在线全文

学校读者我要写书评

暂无评论

Journal of central South University 2017年第8期24卷 1720-1726页

作者：刘秉国余延涛彭金辉 c.srinivasakannan 张利波郭胜惠 Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming 650093China State Key Laboratory of complex Nonferrous Metal Resources clean Utilization in Yunnan Province Kunming 650093China Key Laboratory of Unconventional Metallurgy of Ministry of Education Kunming University of Science and TechnologyKunming 650093China chemical Engineering Department the Petroleum InstituteAbu DhabiUAE

The preparation of microsized hematite powder from ferrous sulfate using microwave calcination was investigated based on the TG/DTG curves. The decomposition of industrial ferrous sulfate under air atmosphere was divided into three stages, and a ferrous sulfate sample added with 15% Fe_2O_3 could strongly absorb microwave energy. Therefore, preparing hematite powder from ferrous sulfate using microwave calcination was feasible. Hematite was obtained under the following optimized conditions: calcination temperature, 850 °c; microwave power, 650 W; and sample amount, 40 g. The obtained hematite satisfied the first-grade quality requirements. The total ferrum value was more than 58%, and the total sulfur and phosphorus contents were less than 0.5% and 0.2%, respectively. X-ray powder diffraction and scanning electron microscopy were used to characterize the structure and morphology of microsized hematite powder. The particles were non-spherical in shape, and the average particle size distribution was 10.45 μm. This work provides new potential applications for waste ferrous sulfate.

关键词： hematite microwave calcination ferrous sulfate heating behavior microsize

Process optimization for treatment of methyltin mercaptide effluents using modified semi-coke

在线全文

学校读者我要写书评

暂无评论

Journal of central South University 2013年第12期20卷 3633-3640页

作者：王欣 c.srinivasakannan 曲雯雯彭金辉张利波段昕辉卢帅丹 Key Laboratory of Unconventional Metallurgy of Ministry of Education (Faculty of Metallurgy and Energy Engineering Kunming University of Science and Technology) Engineering Laboratory of Microwave Application and Equipment Technology chemical Engineering Program The Petroleum Institute

The central composite process optimization was performed by response surface methodology technique using a design for the treatment of methyltin mercaptide with modified semi-coke. The semi-coke from the coal industry was suitably modified by treating it with phosphoric acid, with a thermal activation process. The objective of the process optimization is to reduce the chemical oxygen demand （cOD） and NH4＋-N in the methyltin mercaptide industrial effluent. The process variables considered for process optimization are the semi-coke dosage, adsorption time and effluent pH. The optimized process conditions are identified to be a semi-coke dosage of 80 g/L, adsorption time of 90 min and a pH value of 8.34. The ANOVA results indicate that the adsorbent dosage and pH are the significant parameters, while the adsorption time is insignificant, possibly owing to the large range of adsorption time chosen. The textural characteristics of modified semi-coke were analyzed using scanning electron microscopy and nitrogen adsorption isotherm. The average BET surface area of modified semi-coke is estimated to be 915 mE/g, with the average pore volume of 0.71 cm3/g and a average pore diameter of 3.09 nm, with micropore volume contributing to 52.36%.

关键词： modified semi-coke semi-coke optimization water treatment chemical oxygen demand (cOD) NH4+-N

海枣核cO_2活化和磷酸活化制备活性炭及其结构、吸附性能(英文)

在线全文

学校读者我要写书评

暂无评论

新型炭材料 2012年第5期27卷 344-351页

作者： K. Suresh Kumar Reddy Ahmed Al Shoaibi c. srinivasakannan chemical Engineering Department The Petroleum Institute P.O. Box 2533 Abu Dhabi UAE

由于具有很大的吸附容量,多孔炭材料是优良的吸附剂。笔者试图比较海枣核分别经cO2活化和磷酸活化所制活性炭的结构和吸附性能。活化过程和工艺条件对炭的物理化学性质影响较大,根据文献报道的结果选取了优化的工艺参数。基于氮气吸附... 详细信息

由于具有很大的吸附容量,多孔炭材料是优良的吸附剂。笔者试图比较海枣核分别经cO2活化和磷酸活化所制活性炭的结构和吸附性能。活化过程和工艺条件对炭的物理化学性质影响较大,根据文献报道的结果选取了优化的工艺参数。基于氮气吸附等温线、SEM、FT-IR等分析结果,评估了活性炭的结构特征,吸附性能则由亚甲蓝吸附值表示。cO2活化得到了微孔活性炭,产率为44%、BET比表面积是666 m2·g-1;磷酸活化得到了产率为14.8%的中孔活性炭,BET比表面积为725 m2·g-1。cO2活化活性炭的平均孔径是1.51 nm,磷酸活化活性炭的则为2.91 nm。活性炭的亚甲蓝吸附等温线分别用Langmuir等温线和Freundlich等温线进行了验证,在优化工艺条件下制备的cO2活化炭和磷酸活化炭的亚甲蓝w单分子吸附容量分别为110 mg·g-1和345 mg·g-1。然而,磷酸活化产生的亚甲蓝吸附值最高达455 mg·g-1。

关键词：活性炭物理活化化学活化 Langmuir等温线 Freundlich等温线

Removal of cadmium from aqueous solutions using red mud granulated with cement

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of china 2012年第12期22卷 3140-3146页

作者：巨少华卢帅丹彭金辉张利波 c.srinivasakannan 郭胜惠李玮云南省复杂有色金属资源清洁利用国家重点实验室昆明650093 昆明理工大学非常规冶金教育部重点实验室昆明650093 昆明理工大学冶金与能源工程学院昆明650093 chemical Engineering Department The Petroleum Institute P.O.Box 2533 Abu Dhabi United Arab Emirates

A novel adsorbent was prepared from granular red mud mixed with cement and its potential to be a suitable adsorbent for the removal of cadmium ions from aqueous solutions was evaluated. The wet red mud was directly mixed up with cement at different mass fractions of 2%-8% and their properties were investigated. Based on the textural characteristics and strength, the granular red mud with 2% addition of cement maintaining for 6 d is identified to have better properties. The batch adsorption experiments for adsorption of cd2+ ions from solution were performed at 30, 40 and 50 °c at different initial concentrations under the condition of constant pH of 6.5. The equilibrium adsorption was found to increase with the increase of temperature during the adsorption process. Langmuir adsorption isotherm model was found to match the experimental adsorption isotherm better. The kinetics of adsorption was modeled using a pseudo second order kinetic model and the model parameters were estimated.

关键词： granular red mud cadmium waste water processing adsorption aqueous solutions cement

Influence of carbon coating prepared by microwave pyrolysis on properties of LiNi_(1/3) Mn_(1/3) co_(1/3) O_2

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of china 2013年第10期23卷 2971-2976页

作者：韩亚梅张正富张利波彭金辉傅梦笔 c.srinivasakannan 杜江昆明理工大学材料科学与工程学院昆明650093 昆明理工大学微波工程应用及装备技术国家地方联合工程实验室昆明650093 昆明理工大学非常规冶金教育部重点实验室昆明650093 chemical Engineering Department The Petroleum Institute

A novel synthesis method of carbon-coated LiNil/3Mnl/3cOl/302 cathode material for lithium-ion battery was reported. The carbon coating was produced from a precursor, glucose, by microwave-pyrolysis method. The prepared powders were characterized by scanning electron microscopy （SEM）, X-ray diffraction （XRD）, X-ray fluorescence （XRF） and charge/discharge tests. XRD results indicate that the carbon coating does not change the phase structure of LiNil/3Mnl/3c01/302 material. SEM results show that the surface of spherical carbon-coated material becomes rough. Electrochemical performance results show that the carbon coating can improve the cycling performance of LiNii/3Mnl/3c01/302. The specific discharge capacity retention of the carbon-coated LiNi1/3Mnt/3col/30z reached 85.0%-96.0% at the 50th cycle at 0.2c rate, and the specific discharge capacity retention is improved at a high rate.

关键词： lithium-ion battery cathode material carbon coating microwave pyrolysis method electrochemical performance

Preparation of sodium molybdate from molybdenum concentrate by microwave roasting and alkali leaching

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 91-105页

作者： Fengjuan Zhang chenhui Liu srinivasakannan chandrasekar Yingwei Li Fuchang Xu School of chemistry and Environment Yunnan Minzu UniversityKunming 650500China chemical Engineering Department Khalifa UniversityAbu DhabiUAE Yunnan Zhong Tai Technology co. Ltd.Kunming 650500China Yunnan Yongchang Silicon Industry co. Ltd.Baoshan 678000China

The preparation process of sodium molybdate has the disadvantages of high energy consumption,low thermal efficiency,and high raw material requirement of molybdenum trioxide,in order to realize the green and efficient development of molybdenum concentrate resources,this paper proposes a new process for efficient recovery of molybdenum from molybdenum concentrate and preparation of sodium molybdate by microwave-enhanced roasting and alkali *** analysis indicated the feasibility of oxidation roasting of molybdenum *** effects of roasting temperature,holding time,and power-to-mass ratio on the oxidation product and leaching product sodium molybdate (Na_(2)MoO_(4)·2H_(2)O) were *** the optimal process conditions:roasting temperature of 700℃,holding time of 110 min,and power-to-mass ratio of 110 W/g,the molybdenum state of existence was converted from MoS_(2) to Mo *** process of preparing sodium molybdate by alkali leaching of molybdenum calcine was investigated,the optimal leaching conditions include a solution concentration of 2.5 mol/L,a liquid-to-solid ratio of 2 mL/g,a leaching temperature of 60℃,and leaching solution termination at pH *** optimum conditions result in a leaching rate of sodium molybdate of 96.24%.Meanwhile,the content of sodium molybdate reaches 94.08wt%after leaching and removing *** and aluminum impurities can be effectively separated by adjusting the pH of the leaching solution with sodium carbonate *** research avoids the shortcomings of the traditional process and utilizes the advantages of microwave metallurgy to prepare high-quality sodium molybdate,which provides a new idea for the highvalue utilization of molybdenum concentrate.

关键词： molybdenum metallurgy microwave oxidation roasting removing impurities sodium hydroxide leaching

Microwave absorbing characteristics and temperature increasing behavior of basic cobalt carbonate in microwave field

在线全文

学校读者我要写书评

暂无评论

Journal of central South University 2010年第6期17卷 1211-1215页

作者：刘秉国彭金辉张利波 srinivasakannan c 黄铭张泽彪郭胜惠 Faculty of Materials and Metallurgical Engineering Kunming University of Science and Technology Key Laboratory of Unconventional Metallurgy Ministry of EducationKunming University of Science and Technology School of Engineering Monash UniversitySunway Campus46150Petaling JayaSelangorMalaysia School of Information Science and Engineerin g Yunnan University

The microwave absorbing characteristics of basic cobalt carbonate,cobalt oxide(co3O4),and the mixture of basic cobalt carbonate and cobalt oxide were investigated by means of microwave cavity perturbation,their temperature increasing curves were measured,and their ability to absorb microwave energy was also assessed based on the temperature increasing behavior of the material exposed to microwave *** of spectrum attenuation and relative frequency shift show that basic cobalt carbonate has weak capability to absorb microwave energy,while cobalt oxide has very strong capability to absorb microwave *** is feasible to thermally decompose basic cobalt carbonate though addition of small amount of cobalt oxide in microwave *** capability to absorb microwave energy of sample increases with an increase in mixing ratio of co3O4.

关键词： basic cobalt carbonate cobalt oxide (co3O4) microwave temperature increasing behavior absorption

Application of Microwave Melting for the Recovery of Tin Powder

在线全文

学校读者我要写书评

暂无评论

Engineering 2017年第3期3卷 423-427页

作者： Lei Xu Jinhui Peng Hailong Bai c. srinivasakannan Libo Zhang Qingtian wu Zhaohui Han Shenghui Guo Shaohua Ju Li Yang Faculty of MetaUurgical and Energy Engineering Kunming University of Science and Technology Kunming 650093 China State Key Laboratory of complex Nonferrous Metal Resources clean Utilization Kunming University of Science and Technology Kunming 650093 China Yunnan Tin croup (Holding) company Limited Gejiu Yunnan 661000 China chemical Engineering Program The Petroleum Institute P.O. Box 2533 Abu Dhabi United Arab Emirates

The present work explores the application of microwave heating for the melting of powdered tin. The mor- phology and particle size of powdered tin prepared by the centrifugal atomization method were charac- terized. The tin particles were uniform and spherical in shape, with 90% of the particles in the size range of 38-75μm. The microwave absorption characteristic of the tin powder was assessed by an estimation of the dielectric properties. Microwave penetration was found to have good volumetric heating on powdered tin. conduction losses were the main loss mechanisms for powdered tin by microwave heating at temperatures above 150 ℃. A 20 kW commercial-scale microwave tin-melting unit was designed, developed, and utilized for production. This unit achieved a heating rate that was at least 10 times higher than those of conventional methods, as well as a far shorter melting duration. The results suggest that microwave heating accelerates the heating rate and shortens the melting time. Tin recovery rate was 97.79%, with a slag ratio of only 1.65% and other losses accounting for less than 0.56%. The unit energy consumption was only 0.17 （kW·h）·kg-1- far lower than the energy required by conventional melting methods. Thus, the microwave melting process improved heating efficiency and reduced energy consumption.

关键词： Microwave heating Melting Tin powder Microwave equipment Recovery

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

电凝聚降低造纸工业废水的cOD浓度并脱色

中华纸业 2009年第7期30卷 101-107页

作者： K S Parama Kalyani N Balasubramanian c.srinivasakannan 赵芳

电凝聚是一种有效地处理制浆造纸工业废水的技术。对于处理制浆造纸工业废水的一些影响因素如电解时间、应用的电流密度、电解pH值及有利于提高电解效率的因素一直都研究着。从现在的实验结果可以看到,使用电凝聚处理废水的效果非常显... 详细信息

电凝聚是一种有效地处理制浆造纸工业废水的技术。对于处理制浆造纸工业废水的一些影响因素如电解时间、应用的电流密度、电解pH值及有利于提高电解效率的因素一直都研究着。从现在的实验结果可以看到,使用电凝聚处理废水的效果非常显著。有记录显示的低碳钢电极和铝电极最大的脱色率分别达到92%和84%,cOD去除率分别为95%和89%。实验也指出用序列间歇反应器[Sequential Batch Reactor(SBR)]与电凝聚联合能增加生物降解能力,从而提高生物化学处理效率。电凝聚是用吸附等温线形式模拟,实验发现与朗缪尔(Langmuir)和雷德克-普劳斯尼茨(Radke-Prausnitz)预测的等温线模型完全匹配。

关键词：制浆造纸废水化学需氧量去除率生物降解能力指数脱色等温线反应动力学