Kinetics of Uranium Extraction from Uranium Tailings by Oxidative Leaching
作者：
Zhang, Biao;Li, Mi* ;Zhang, Xiaowen;Huang, Jing
期刊：
JOM ,2016年68(7):1990-2001 ISSN：1047-4838
通讯作者：
Li, Mi
作者机构：
[Zhang, Biao; Li, Mi; Huang, Jing; Zhang, Xiaowen] Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Peoples R China.;[Li, Mi; Zhang, Xiaowen] Univ South China, Key Lab Radioact Waste Treatment & Disposal, Hengyang 421001, Peoples R China.
通讯机构：
[Li, Mi] U;Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Peoples R China.;Univ South China, Key Lab Radioact Waste Treatment & Disposal, Hengyang 421001, Peoples R China.
关键词：
Uranium;Sulfuric Acid Solution;Uranium Concentration;Uranium Oxide;Shrink Core Model
摘要：
Extraction of uranium from uranium tailings by oxidative leaching with hydrogen peroxide (H<inf>2</inf>O<inf>2</inf>) was studied. The effects of various extraction factors were investigated to optimize the dissolution conditions, as well as to determine the leaching kinetic parameters. The behavior of H<inf>2</inf>O<inf>2</inf>in the leaching process was determined through scanning electron microscopy-energy dispersive x-ray spectroscopy (SEM-EDX) and x-ray diffraction analysis of leaching residues. Results suggest that H<inf>2</inf>O<inf>2</inf>can significantly improve uranium extraction by decomposing the complex gangue structures in uranium tailings and by enhancing the reaction rate between uranium phases and the leaching agent. The extraction kinetics expression was changed from 1 − 3(1 − α)<sup>2/3</sup> + 2(1 − α) = K<inf>0</inf>(H<inf>2</inf>SO<inf>4</inf>)<sup>−0.14903</sup>(S/L)<sup>−1.80435</sup>(R<inf>o</inf>)<sup>0.20023</sup>e<sup>−1670.93/T</sup>t (t ≥ 5) to 1 − 3(1 − α)<sup>2/3</sup> + 2(1 − α) = K<inf>0</inf>(H<inf>2</inf>SO<inf>4</inf>)<sup>0.01382</sup>(S/L)<sup>−1.83275</sup>(R<inf>o</inf>)<sup>0.25763</sup>e<sup>−1654.59/T</sup>t (t ≥ 5) by the addition of H<inf>2</inf>O<inf>2</inf>in the leaching process. The use of H<inf>2</inf>O<inf>2</inf>in uranium leaching may help in extracting uranium more efficiently and rapidly from low-uranium-containing ores or tailings. ©2016, The Minerals, Metals & Materials Society.
语种：
英文
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采用HF和HClO_4从铀尾矿中浸出铀的试验研究
作者：
李密;黄婧;戴士祥;张晓文;张彪;...
期刊：
中国矿业大学学报 ,2016年45(3):639-645 ISSN：1000-1964
通讯作者：
Li, Mi(enemy_1983@163.com)
作者机构：
[李密; 戴士祥; 黄婧; 张晓文; 张彪] School of Environment Protection and Safety Engineering, University of South China, Hengyang, Hunan, 421001, China;[丁德馨] Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, Hunan, 421001, China;[李密; 张晓文] Key Laboratory of Radioactive Waste Treatment and Disposal, University of South China, Hengyang, Hunan, 421001, China
通讯机构：
School of Environment Protection and Safety Engineering, University of South China, Hengyang, Hunan, China
关键词：
铀尾矿;浸出;强化机理;脉石
摘要：
为了从低品位铀尾矿中回收铀资源,在详细分析了铀尾矿工艺矿物学性质的基础上,提出了以硫酸为浸出剂,HF和HClO_4为强化剂的氧化强化浸铀工艺,研究了工艺参数对铀浸出的影响,并通过X射线衍射仪、激光粒度仪及扫描电镜等手段分析铀尾矿浸出过程中的物相、粒度及形貌特征变化,揭示了HF和HClO_4对铀尾矿浸出的强化作用机理.研究结果表明:HF可分解硅酸盐类矿物结构,而HClO_4可对脉石颗粒表面造成"溶蚀",二者均可促进脉石颗粒与铀的解离,但HClO_4的作用效果低于HF.当浸出温度为50 ℃,硫酸浓度为1.5 mol/L,浸出时间为80 min,液固质量比为12时,HF和HClO_4对铀的浸出率分别为96%和78%.
语种：
中文
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Investigation of gamma ray shielding efficiency and mechanical performances of concrete shields containing bismuth oxide as an environmentally friendly additive
作者：
Yao, Ya;Zhang, Xiaowen* ;Li, Mi;Yang, Rong;Jiang, Tianjiao;...
期刊：
Radiation Physics and Chemistry ,2016年127:188-193 ISSN：0969-806X
通讯作者：
Zhang, Xiaowen
作者机构：
[Yao, Ya; Yang, Rong; Jiang, Tianjiao] Univ South China, Sch Environm Protect & Safety Engn, Hengyang 42100, Peoples R China.;[Li, Mi; Lv, Junwen; Zhang, Xiaowen] Univ South China, Key Lab Radioact Waste Treatment & Disposal, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Zhang, Xiaowen] U;Univ South China, Key Lab Radioact Waste Treatment & Disposal, Hengyang 421001, Hunan, Peoples R China.
关键词：
Bismuth oxide;Compressive strength;Concrete;Lead oxide;Linear attenuation coefficient
摘要：
Concrete has a proven ability to attenuate gamma rays and neutrons without compromising structural property;therefore, it is widely used as the primary shielding material in many nuclear facilities. Recently, there is a tendency toward using various additives to enhance the shielding properties of these concrete mixtures. However, most of these additives being used either pose hygiene hazards or require special handling processes. It would be ideal if environmentally friendly additives were available for use. The bismuth oxide (Bi<inf>2</inf>O<inf>3</inf>) additive shows promise in various shielding applications due to its proven radiation attenuation ability and environmentally friendly nature. To the best of our knowledge, however, Bi<inf>2</inf>O<inf>3</inf>has never been used in concrete mixtures. Therefore, for this research, we fabricated the Bi<inf>2</inf>O<inf>3</inf>-based concrete mixtures by adding Bi<inf>2</inf>O<inf>3</inf>powder in the ordinary concrete mixture. Concrete mixtures with lead oxide (PbO) additives were used for comparison. Radiation shielding parameters like the linear attenuation coefficients (LAC) of all these concrete mixtures showing the effects of the Bi<inf>2</inf>O<inf>3</inf>additions are presented. The mechanical performances of concrete mixtures incorporated with Bi<inf>2</inf>O<inf>3</inf>additive were also investigated. It suggested that the concrete mixture containing 25% Bi<inf>2</inf>O<inf>3</inf>powder (B5 in this study) provided the best shielding capacity and mechanical performance among other mixes. It has a significant potential for application as a structural concrete where radiological protection capability is required. ©2016 Elsevier Ltd
语种：
英文
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Remediation of Heavy Metal Contaminated Soil by Leaching with Na(2)EDTA and STPP
作者：
Zhang Xiaowen* ;Yang Rong;Li Mi;Liu Lifen;Yao Ya;...
作者机构：
[Li Mi; Zhang Xiaowen; Yang Rong; Yao Ya; Peng Ying] Univ South China, Key Lab Radioact Waste Treatment & Disposal, Hengyang 421001, Peoples R China.;[Zhang Xiaowen; Liu Lifen] Univ South China, Coll Urban Construct, Hengyang 421001, Peoples R China.
会议名称：
International Conference on Civil, Transportation and Environment (ICCTE)
会议时间：
JAN 30-31, 2016
会议地点：
Guangzhou, PEOPLES R CHINA
会议主办单位：
[Zhang Xiaowen;Yang Rong;Li Mi;Yao Ya;Peng Ying] Univ South China, Key Lab Radioact Waste Treatment & Disposal, Hengyang 421001, Peoples R China.^[Liu Lifen] Univ South China, Coll Urban Construct, Hengyang 421001, Peoples R China.
会议论文集名称：
AER-Advances in Engineering Research
关键词：
STPP;Na(2)EDTA;Lead;Cadmium;Copper;Composite leaching
摘要：
The contamination of soils with heavy metals has become a major environmental concern. Extractive-decontamination of the toxic metals (Pb, Cd and Cu) from the contaminated soil using N(2)EDTA and STPP was evaluated by batch extraction. The influences of mixed liquid concentrations, oscillating time, pH of solutions on leaching efficiency were investigated. Pb, Cd and Cu fractions characteristics were compared before and after leaching to reveal the leaching of them. The extraction efficiencies increased in the order of Pb > Cd > Cu for Na(2)EDTA, and Cd > Pb > Cu for STPP. Na2EDTA and STPP can coordinate with metal ions in the soil, but the complexing ability of STPP is relatively weak. Synergistic effects on metal leaching with contaminated soil were observed in low solution. However, antagonistic effects on metal leaching were found at higher than 0.01 mol/L. The heavy metal removal efficiency from soil increases with concentrations of mixed solutions and leching time. Metal fractionation analysis showed that the leaching metal was mainly from acid exchangeable, reduction state, oxidation state, while residual state metals were almost unchanged.
语种：
英文
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CMOS相机液体闪烁体衰减长度自动测量装置的研制
作者：
王续琨;张晓文;俞伯祥;周莉;孙丽君
期刊：
核电子学与探测技术 ,2015年35(12):1251-1254and1262 ISSN：0258-0934
通讯作者：
Zhang, X.-W.
作者机构：
南华大学放射性三废处理与处置重点实验室;[俞伯祥; 周莉; 孙丽君] 核探测与核电子学国家重点实验室;中国科学院高能物理研究所;[张晓文; 王续琨] 南华大学
通讯机构：
Key Laboratory of Radioactive Waste Treatment and Disposal, University of South China, Hengyang, China
关键词：
衰减长度;CMOS相机;液体闪烁体
摘要：
江门中微子实验是测定中微子的质量顺序和精确测量中微子混合参数的实验,为此需要建造一个直径约34.5 m的球形液体闪烁体探测器.为了保证在闪烁体中产生的光子可以传输到球面上布置的光电倍增管而不被自身吸收,这就对液体闪烁体的衰减长度及其测量方法提出了很高的要求.本项目经过对算法、相机本底等方面的研究,实现了用CMOS相机取代光电倍增管测量衰减长度,并且重新搭建结构和编写程序.最终精简了整个系统,使调试更加方便,在保证测量准确度的前提下实现全自动测量,在节省时间和人力的同时,也减少了误差.
语种：
中文
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Study on the removal technology of fluorescent permeating agent emulsifying wastewater
作者：
Li, Juan* ;Zhang, Xiaowen;Wang, Wenxian
期刊：
ENVIRONMENTAL TECHNOLOGY AND RESOURCE UTILIZATION II ,2014年675-677:583-586 ISSN：1662-7482
通讯作者：
Li, Juan
作者机构：
[Zhang, Xiaowen; Wang, Wenxian; Li, Juan] Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Li, Juan] U;Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Peoples R China.
会议名称：
International Conference on Renewable Energy and Environmental Technology
会议时间：
2014-08-19
会议地点：
Dalian
会议主办单位：
[Li, Juan;Zhang, Xiaowen;Wang, Wenxian] Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Peoples R China.
会议论文集名称：
Environmental technology and resource utilization II: Selected, peer reviewed papers from the 2014 2nd International Conference on Renewable Energy and Environmental Technology (REET 2014), August 19-20, 2014, Dalian, China
关键词：
fluorescent permeating agent;emulsified wastewater;demulsification;coagulation;Fenton
摘要：
The experimental treatment of emulsifying wastewater containing fluo rescent permeating agent is conducted using demulsification, flocculation, sedimentation and Fenton processes. The experimental results show that, under the appropriate conditions, the COD, oil and chromaticity can be removed efficiently. The pH, COD, oil and chromaticity of the outwater can reach the national standards.
语种：
英文
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Transformation behaviors of U(VI) on irons hydroxide colloids
作者：
Tan, Yanpeng* ;Zhang, Xiaowen;Lv, Junwen;Tang, Dongshan;Su, Qin
期刊：
Advanced Materials Research ,2013年734-737:2563-2567 ISSN：1022-6680
通讯作者：
Tan, Yanpeng
作者机构：
[Tan, Yanpeng; Su, Qin] Univ South China, Sch Urban Construct, Hengyang 421001, Hunan, Peoples R China.;[Lv, Junwen; Zhang, Xiaowen; Tang, Dongshan] Univ South China, Sch Environm Protect & Safety Engn, Hengyang, Hunan, Peoples R China.
通讯机构：
[Tan, Yanpeng] U;Univ South China, Sch Urban Construct, Hengyang 421001, Hunan, Peoples R China.
会议名称：
2nd International Conference on Energy and Environmental Protection (ICEEP 2013)
会议时间：
APR 19-21, 2013
会议地点：
Guilin, PEOPLES R CHINA
会议主办单位：
[Tan, Yanpeng;Su, Qin] Univ South China, Sch Urban Construct, Hengyang 421001, Hunan, Peoples R China.^[Zhang, Xiaowen;Lv, Junwen;Tang, Dongshan] Univ South China, Sch Environm Protect & Safety Engn, Hengyang, Hunan, Peoples R China.
会议论文集名称：
Advanced Materials Research
关键词：
Adsorption;Iron hydroxide colloids;Uranium
摘要：
The presence of the colloid will affect uranium heap leaching. The objective of this study was the examination of the ability of colloid retardation to uranium by irons hydroxide colloids simulated heap leaching process. Batch studies have been carried by observing the effects of pH, contact time, uranium concentration. Iron hydroxide colloids can exist stably at pH 1.5-3.0. The size of the colloid samples is between 20 nm and 1000 nm. The sorption equilibrium was attained at 24 h. The load uranium capacity on iron hydroxide colloids are between 2.43×10-3 and 3.84×10-3 mmol/mol. The colloid morphology of before and after loaded uranium were identified using S-4800 scanning electron microscopy (SEM/EDS). The load uranium capacity on iron hydroxide colloids is least at pH=2, it implies that the appropriate pH of uranium heap leach is 2.0 on the point of retardation of colloid to uranium migration. © (2013) Trans Tech Publications, Switzerland.
语种：
英文
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6-Phenyl-6,7-dihydro-dibenzo[c,f][1,5]aza-bis-mocin-12(5H)-yl perchlorate
作者：
Zhang, Xiao-Wen* ;Fan, Ting
期刊：
ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY ,2011年67(7):M875-U578 ISSN：2053-2296
通讯作者：
Zhang, Xiao-Wen
作者机构：
[Zhang, Xiao-Wen] Univ S China, Coll Environm Protect & Safety Engn, Hengyang 421001, Peoples R China.;[Fan, Ting] Univ S China, Key Lab Pollut Control & Resource Use Hunan Prov, Hengyang 421001, Peoples R China.
通讯机构：
[Zhang, Xiao-Wen] U;Univ S China, Coll Environm Protect & Safety Engn, Hengyang 421001, Peoples R China.
摘要：
In the title compound, [Bi(C 20H 17N)(ClO 4)] or C 20H 17BiClNO 4, the Bi III ion assumes a distorted trigonal-bipyramidal geometry, with two C atoms and the electron lone pair of the Bi atom at the equatorial positions and an amine N atom and a perchlorate O atom at the apical positions. Weak inter-molecular C - H⋯O hydrogen bonding is present in the crystal structure. © Zhang and Fan 2011.
语种：
英文
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6-Cyclohexyl-6,7-dihydrodibenzo[c,f][1,5]azabismocin-12(5H)-yl(N→Bi) trifluoromethanesulfonate
作者：
Tan, Nianyuan* ;Zhang, Xiaowen
期刊：
ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY ,2011年67(2):M252-U1460 ISSN：2053-2296
通讯作者：
Tan, Nianyuan
作者机构：
[Tan, Nianyuan] Hunan Inst Engn, Coll Chem & Chem Engn, Xiangtan 411104, Peoples R China.;[Zhang, Xiaowen] Univ S China, Key Lab Pollut Control & Resource Use Hunan Prov, Hengyang 421001, Peoples R China.
通讯机构：
[Tan, Nianyuan] H;Hunan Inst Engn, Coll Chem & Chem Engn, Xiangtan 411104, Peoples R China.
摘要：
In the title compound, [Bi(C20H23N)(CF 3SO3)], the BiIII ion shows a distorted pseudo-trigonal-bipyramidal geometry, with two C atoms and a lone electron pair of the Bi atom in equatorial positions and the N and O atoms at the apical positions. The cyclohexyl group is disordered over two orientations with site-occupancy factors of 0.600 (14) and 0.400 (14).
语种：
英文
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Case of Climate Warming, Running Uranium Exhaust Port Impact on the Surrounding Ecological Environmen
作者：
Zhou, YaoHui* ;Liu, Jiang;Zhang, XiaoWen;Xie, SuiBo
作者机构：
[Xie, SuiBo; Liu, Jiang; Zhang, XiaoWen; Zhou, YaoHui] Univ South China, Sch Urban Construct, Hengyang, Hunan, Peoples R China.
会议名称：
International Conference on Bioinformatics and Biomedical Engineering (iCBBE 2010)
会议时间：
2010-01-01
会议地点：
Chengdu, China
会议主办单位：
[Zhou, YaoHui;Liu, Jiang;Zhang, XiaoWen;Xie, SuiBo] Univ South China, Sch Urban Construct, Hengyang, Hunan, Peoples R China.
会议论文集名称：
2010 4th International Conference on Bioinformatics and Biomedical Engineering. [v.1.1]
关键词：
Climate Warming;Uranium mine air vents;Ecology Environment;Impact
摘要：
According to two uranium mine air vents when the normal operation of the monitoring data, It was been projected the distribution of radioactive nuclide effluents, emissions, its main mechanism of radionuclide migration and the end result was discussed and studied uranium mine air vents on the surface run-time Ecology (atmosphere, soil, vegetation, etc.) environmental impact, it shows: With climate warming, the operation of uranium air vents impact on the surrounding ecological environment will gradually increase. Control of uranium effluent emissions from air vents is to improve the ecological environment near the exhaust port an important measure, we recommend the establishment of controlled areas and supervised the mouth ventilation in the installation of exhaust purification equipment.
语种：
英文
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Air-stable hypervalent organobismuth(III) tetrafluoroborate as effective and reusable catalyst for the allylation of aldehyde with tetraallyltin
作者：
Zhang, Xiamen;Qiu, Renhua;Tan, Nianyuan;Yin, Shuangfeng* ;Xia, Jun;...
期刊：
Tetrahedron Letters ,2010年51(1):153-156 ISSN：0040-4039
通讯作者：
Yin, Shuangfeng
作者机构：
[Tan, Nianyuan; Au, Chak-Tong; Zhang, Xiamen; Qiu, Renhua; Xia, Jun; Luo, Shenglian; Yin, Shuangfeng] Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Hunan, Peoples R China.;[Zhang, Xiamen] Univ S China, Key Lab Pollut Control & Resource Use Hunan Prov, Hengyang 421001, Peoples R China.;[Au, Chak-Tong] Hong Kong Baptist Univ, Dept Chem, Kowloon, Hong Kong, Peoples R China.
通讯机构：
[Yin, Shuangfeng] H;Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Hunan, Peoples R China.
关键词：
Organobismuth;Tetrafluoroborate;Lewis acid;Catalysis;Allylation
摘要：
Air-stable hypervalent organobismuth(III) tetrafluoroborate (C6H11N(CH2C6H4)2BiBF4) was synthesized and characterized by spectroscopic and X-ray crystallographic techniques. The compound shows good catalytic efficiency in the allylation reaction of different aldehydes with tetraallyltin in a medium of aqueous methanol, giving the corresponding homoallylic alcohols in excellent chemoselectivity and yields.
语种：
英文
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Synthesis, structure, and in vitro antiproliferative activity of cyclic hypervalent organobismuth(III) chlorides and their triphenylgermylpropionate derivatives
作者：
Zhang, Xiao-Wen;Xia, Jun;Yan, Hui-Wen;Luo, Sheng-Lian;Yin, Shuang-Feng* ;...
期刊：
Journal of Organometallic Chemistry ,2009年694(18):3019-3026 ISSN：0022-328X
通讯作者：
Yin, Shuang-Feng
作者机构：
[Au, Chak-Tong; Yin, Shuang-Feng; Zhang, Xiao-Wen; Xia, Jun; Luo, Sheng-Lian] Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Peoples R China.;[Zhang, Xiao-Wen] Univ S China, Key Lab Pollut Control & Resource Use Hunan Prov, Hengyang 421001, Peoples R China.;[Yan, Hui-Wen] Cent S Univ, Cell Biol Biosci & Technol Acad, Changsha 410013, Peoples R China.;[Au, Chak-Tong; Wong, Wai-Yeung] Hong Kong Baptist Univ, Dept Chem, Kowloon Tong, Hong Kong, Peoples R China.;[Wong, Wai-Yeung] Hong Kong Baptist Univ, Ctr Adv Luminescene Mat, Kowloon Tong, Hong Kong, Peoples R China.
通讯机构：
[Yin, Shuang-Feng] H;Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Peoples R China.
关键词：
Bismuth;Germanium;Hypervalent;Antiproliferative activity
摘要：
Six compounds of cyclic hypervalent organobismuth(III) chlorides and triphenylgermylpropionates bearing a nitrogen or sulfur atom as intramolecular coordination atom have been synthesized and characterized. The results of single-crystal X-ray analysis reveal that the eight-membered tetrahydroazabismocine rings are highly flexible. The Bi-S or Bi-N bond lengths in the thiabismocine or azabismocine derivatives are dependent on how the substituted groups are acting on the Bi, S or N atom. The replacement of the chlorine atom in azabismocine and thiabismocine with the triphenylgermylpropionic group (Ph<inf>3</inf>GeCH<inf>2</inf>CH<inf>2</inf>COO{single bond}) leads to the lengthening of Bi-N and Bi-S bond. The substituents connected with the nitrogen atom also have an effect on the Bi-N bond length of azabismocine. For example, a cyclohexyl group has electron-donating ability higher than a phenyl group;the replacement of the former by the latter would lead to the decline of Bi-N bond length and increase of C<inf>Ar</inf>-Bi-C<inf>Ar</inf> angle in the eight-membered ring. The in vitro antiproliferative activities of the fabricated materials were compared on gastric carcinoma cells by means of the 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl tetrazolium bromide (MTT) method. It was found that the compounds show antiproliferative activity on gastric carcinoma cells (MGC-803) much higher than that of cisplatin. Moreover, there is enhancement of antiproliferative activity when the chlorine atom of the bismocine compounds is replaced by the triphenylgermylpropionic group, giving a low IC<inf>50</inf> value of 0.7 μM for thiabismocine triphenylgermylpropionate. ©2009 Elsevier B.V. All rights reserved.
语种：
英文
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Synthesis and structure of an air-stable hypervalent organobismuth (III) perfluorooctanesulfonate and its use as high-efficiency catalyst for Mannich-type reactions in water
作者：
Zhang, Xiaowen;Yin, Shuangfeng* ;Qiu, Renhua;Xia, Jun;Dai, Weili;...
期刊：
Journal of Organometallic Chemistry ,2009年694(22):3559-3564 ISSN：0022-328X
通讯作者：
Yin, Shuangfeng
作者机构：
[Au, Chak-Tong; Qiu, Renhua; Yu, Zhenying; Zhang, Xiaowen; Xia, Jun; Yin, Shuangfeng; Dai, Weili] Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Peoples R China.;[Zhang, Xiaowen] Univ S China, Key Lab Pollut Control & Resource Use Hunan Prov, Hengyang 421001, Peoples R China.;[Au, Chak-Tong; Wong, Wai-Yeung] Hong Kong Baptist Univ, Dept Chem, Kowloon Tong, Hong Kong, Peoples R China.;[Wong, Wai-Yeung] Hong Kong Baptist Univ, Ctr Adv Luminescence Mat, Kowloon Tong, Hong Kong, Peoples R China.
通讯机构：
[Yin, Shuangfeng] H;Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Peoples R China.
关键词：
Crystal structure;Mannich;Three-component reaction;Organobismuth;Perfluorooctanesulfonate
摘要：
An air-stable hypervalent organobismuth (III) perfluorooctanesulfonate was synthesized and characterized by spectroscopic and X-ray crystallographic techniques, and found to exhibit high catalytic efficiency towards one-pot Mannich-type reaction of ketones with aromatic aldehydes and aromatic amines in water. This catalyst also shows good recyclability and reusability. This catalytic system would provide a simple, efficient and 'green' avenue towards the synthesis of beta-amino ketones. (C) 2009 Published by Elsevier B.V.
语种：
英文
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有机铋化学近十年的研究进展
作者：
Zhang Xiaowen* ;Yin Shuangfeng;Wu Shuisheng;Dai Weili;Li Wensheng;...
期刊：
化学进展 ,2008年20(6):878-886 ISSN：1005-281X
通讯作者：
Zhang Xiaowen
作者机构：
[Zhang Xiaowen; Yin Shuangfeng; Li Wensheng; Wu Shuisheng; Dai Weili; Zhou Xiaoping] Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Hunan, Peoples R China.;[Zhang Xiaowen] Nanhua Univ, Coll City Construct, Hengyang 421001, Peoples R China.
通讯机构：
[Zhang Xiaowen] H;Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Hunan, Peoples R China.
关键词：
有机铋化合物;交联偶合;芳基化;催化剂
摘要：
铋及其化合物具有相对价廉、低毒性和低放射性等特点,已应用于医药、催化、化妆品和电子技术等领域.本文回顾了近10多年来有机铋化学的研究状况,主要从以下4个方面进行综述:(1)新型有机铋化合物的合成途径与结构特征;(2)有机铋化合物作为交联偶合、氧化、芳基化和其它反应的试剂;(3)作为催化剂;(4)作为生物医药用于溃疡、肿瘤和放射治疗等.文中着重从分子水平阐述了新型有机铋化合物的结构与其化学和生物活性之间的关系.此外,还介绍了有机铋化学研究领域的不足和今后的发展趋势.
语种：
中文
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硫酸铀酰印迹离子交换树脂的合成及识别特性研究
作者：
刘耀驰;张晓文;刘慧君;徐伟箭
期刊：
高校化学工程学报 ,2006年20(4):510-514 ISSN：1003-9015
通讯作者：
Liu, Y.-C.
作者机构：
[张晓文; 刘慧君] College of Architecture Engineering and Resource Environment, Nanhua University, Hengyang 421001, China;[徐伟箭] College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China;[刘耀驰] College of Architecture Engineering and Resource Environment, Nanhua University, Hengyang 421001, China<&wdkj&>College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
通讯机构：
[Liu, Y.-C.] C;College of Architecture Engineering and Resource Environment, Nanhua University, China
关键词：
分子印迹技术;离子交换树脂;硫酸铀酰离子;二乙基烯丙基胺
摘要：
为进行稀溶液中铀的浓缩，以硫酸铀酰为模板、二乙基烯丙基胺为功能单体，在水中采用自组装分子印迹技术制备了硫酸铀酰印迹离子交换树脂。对树脂合成条件进行了优化，研究了pH值对吸附量的影响、分子印迹聚合物MIPs-4的等温吸附与吸附动力学、柱内吸附与淋洗曲线等树脂识别性能。结果表明：印迹树脂对硫酸铀酰的吸附性能比非印迹树脂好，可以在pH=1-6范围内应用，并在pH为2左右时吸附能力最强。MIPs-4树脂的吸附等温线为“优吸”型，吸附在约3h达到平衡。当Co=0、125mg·mL^-1时，Kd=0、249L·g^-1。吸附液p（U）=1．0mg·mL^-1、接触时间4min进行的柱内试验得出MIPs-4的穿透体积、穿透容量和饱和容量分别为柱内树脂的床体积（BV）的22倍、21．6mg·mL^-1和36．2mg·mL^-1。以0．05mol·L^-1 H2SO4＋1.0mol·L^-1 NaCl为淋洗液时，淋洗体积仅4BV，流出液中最大铀浓度达到17.6mg·mL^-1。印迹树脂的吸附和解吸性能好，可应用于低浓度铀的浓缩及含铀废水的处理。
语种：
中文
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泥灰岩——白云石型铀矿石的浸出
作者：
张晓文;徐伟箭;黄晓乃;熊运钦
期刊：
中国矿业 ,2006年15(4):58-61 ISSN：1004-4051
作者机构：
湖南大学化学化工学院·长沙,410082;南华大学建筑工程与资源环境学院·衡阳,421001;[熊运钦; 徐伟箭; 张晓文] 湖南大学;[黄晓乃] 南华大学
关键词：
泥灰岩;白云石;铀矿石;浸出
摘要：
对泥灰岩-白云石型铀矿石的浸出性能进行了研究,采用硫酸浸出时酸耗高达816kg/t,虽浸出率在90%以上,但在技术和经济上有困难,不推荐采用酸法.通过不同的条件实验,认为45g/L Na2CO3+15g/L NaHCO3是最好的配方.在常温下,采用碱法浸出铀的提取率只有60%左右,加入氧化剂对浸出率影响不大.加温浸出时,铀的提取率与常温相比增加10%,可达70%以上.为了获取更高的提取率,需做进一步的工艺研究.
语种：
中文
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我国铀矿山原地破碎浸出与环境保护
作者：
李秦;谢国森;张晓文;黄伟
期刊：
中国矿业 ,2004年13(3):29-32 ISSN：1004-4051
作者机构：
南华大学建筑资源环境学院,衡阳,421001;[张晓文; 黄伟; 谢国森; 李秦] 南华大学
关键词：
铀矿山;原地破碎浸出采铀;“三废”治理;环境保护
摘要：
本文通过对原地破碎浸出采铀特点的论述,说明原地破碎浸出采铀方法与常规采矿方法相比具有效率高、效益好、废料少,且废渣量减少70%～80%左右,从而大大减少了"三废"对环境的影响.因此探讨原地破碎浸出采铀对环境的影响和对"三废"的治理是十分必要的.
语种：
中文
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某铀矿床矿石堆浸粒度浅析
作者：
唐泉;汪德莲;张晓文;周耀辉
期刊：
中国矿业 ,2004年13(11):72-74 ISSN：1004-4051
作者机构：
南华大学核科学与技术学院·衡阳,421001;湖南环境生物职业技术学院·衡阳,421001;南华大学建筑工程与资源环境学院·衡阳,421001
关键词：
矿石;堆浸;粒度;矿山;矿堆;浸出率;铀矿床;浸出性能
摘要：
粒度是矿石堆浸的重要参数之一.本文从浸出率,钼的浸出浓度等方面对该矿山四种不同粒度的矿石浸出性能进行了探讨,通过不同粒度浸出试验,得出该铀矿床矿石有堆浸的经济粒度.为该矿堆浸工业生产提供参考依据.
语种：
中文
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工程项目的施工成本控制方法
作者：
谢国森;李秦;张晓文;黄伟
期刊：
工程管理学报 ,2003年(4):30-33 ISSN：1674-8859
作者机构：
南华大学建筑资源环境学院;[张晓文; 黄伟; 谢国森; 李秦] 南华大学
关键词：
工程项目;施工成本控制;项目目标;建筑业;成本管理;施工图预算控制法
摘要：
通过对工程项目施工成本控制的主要工作、控制对象、控制方法等方面的论述,说明工程项目在实施过程中如果不进行控制,会造成项目目标的偏离.随着偏离的增大,最终可能导致项目的失败.因此实施控制是必要的,成本趋向预测也很重要.对成本超支的原因进行了分析,提出了降低成本的措施.
语种：
中文
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原地爆破浸出采铀矿石块度分布的优化
作者：
钟永明;李秦;谢国森;张晓文;黄伟
期刊：
中国矿业 ,2003年12(12):47-48 ISSN：1004-4051
作者机构：
南华大学建筑学院溶浸采矿研究所·衡阳,421001;[钟永明; 张晓文; 黄伟; 谢国森; 李秦] 南华大学
关键词：
原地爆破;矿石块度分布;矿石品位;浸出率;酸耗
摘要：
本文根据原地爆破浸出采铀的工艺特点,以矿石品位、浸出率和酸耗与爆破矿石块度的关系、Rosin-Rammler爆破块度分布预测模型,探讨实现以利润最大化为目标的爆破矿石块度分布优化的方法.
语种：
中文
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