作者：
Wang Qing-liang*;Ding De-xin;Hu E-ming;Yu Run-lan;Qiu Guan-zhou
期刊：
Transactions of Nonferrous Metals Society of China,2008年18(6):1529-1532 ISSN：1003-6326
通讯作者：
Wang Qing-liang
作者机构：
[Wang Qing-liang; Yu Run-lan; Qiu Guan-zhou] Cent S Univ, Sch Minerals Proc & Bioengn, Changsha 410083, Peoples R China.;[Ding De-xin; Wang Qing-liang; Hu E-ming] Univ S China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.
通讯机构：
[Wang Qing-liang] Cent S Univ, Sch Minerals Proc & Bioengn, Changsha 410083, Peoples R China.
会议名称：
24th International Mineral Processing Congress (IMPC)
会议时间：
SEP 24-28, 2008
会议地点：
Beijing, PEOPLES R CHINA
会议主办单位：
[Wang Qing-liang;Yu Run-lan;Qiu Guan-zhou] Cent S Univ, Sch Minerals Proc & Bioengn, Changsha 410083, Peoples R China.^[Wang Qing-liang;Ding De-xin;Hu E-ming] Univ S China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.
关键词：
sulfate reducing bacteria;in-situ leaching of uranium;radioactively contaminated groundwater;bioremediation
摘要：
In the case of in-situ leaching of uranium, the primitive geochemical environment for groundwater is changed since leachant is injected into the water bearing uranium deposit. This increases the concentration of SO_4~(2-), uranium and other heavy metal ions and results in the groundwater contamination. The effects of pH values of the simulated solution on the reduction of SO_4~(2-) and the removal of uranium and other heavy metal ions by sulfate reducing bacteria(SRB) were studied. The results show that, when the pH value of the simulated solution is about 8, the reduction rate of SO_4~(2-) by SRB and the removal rate of uranium, Mn~(2+), Zn~(2+), Pb~(2+) and Fe~(2+) will reach their highest values. A bioremediation technique for remediation of groundwater in in-situ leaching uranium mine can be developed.
会议主办单位：
[Huang, Tao;Liu, Longfei;Wu, Shilu] Changshu Inst Technol, Sch Chem & Mat Engn, Changshu 215500, Jiangsu, Peoples R China.^[Zhang, Shuwen] Univ South China, Nucl Resources Engn Coll, Hengyang 421001, Hunan, Peoples R China.^[Huang, Tao] Chongqing Univ, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China.^[Huang, Tao] Chongqing Univ, Sch Resource & Environm Sci, Chongqing 400044, Peoples R China.
关键词：
Municipal solid waste incineration fly ash<&wdkj&>Heavy metals<&wdkj&>pH control<&wdkj&>Electrokinetic remediation<&wdkj&>Enhancement
摘要：
The high leachability of heavy metals and toxic organic components has severely discouraged the broader resource recycling of municipal solid waste incineration fly ashes. In this study, a recycling system combining water washing treatment, cationic buffer solution recovery, and electrokinetic remediation was designed based on pH controls and comprehensively explored in terms of strengthening the removal of heavy metals from samples and reducing the risk of environmental leaching of heavy metals in fly ashes. The water washing pretreatment removed a considerable amount of soluble minerals from the fly ash and lowered the initial pH of the electrochemical system to below 10. The dosing of buffer cations decreased the thickness of the diffuse double layer and ameliorated the mobility of the heavy metal species in the pore fluid. Cu was most sensitive to the changes in the operating factors during electrokinetics. The effects of the remediation times and voltage gradients were more significant on heavy metal removal than those of the nitric acid concentration in the electrokinetic optimization system. The leaching toxicities of zinc, lead, copper, and cadmium were reduced by 82.59%, 73.64%, 67.07%, and 93.13%, respectively. Generally, the recovery of the water washing leachate not only enhanced the performance of the electrokinetic remediation for the municipal solid waste incineration fly ash but also avoided downstream disposal of the effluent.
期刊：
International Conference on Nuclear Engineering, Proceedings, ICONE,2010年133(8):84502-1-84502-3 ISSN：0742-4795
通讯作者：
Wang, Jing-song
作者机构：
[Wang, Jing-song; Bao, Zheng-lei; Chen, Si-guang] Univ South China, Hunan Key Lab Pollut Control & Resource Reuse, Sch Urban Construct, Hengyang 421001, Hunan, Peoples R China.;[Yang, Jin-hui] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Wang, Jing-song] Univ South China, Hunan Key Lab Pollut Control & Resource Reuse, Sch Urban Construct, Hengyang 421001, Hunan, Peoples R China.
会议名称：
18th International Conference on Nuclear Engineering (ICONE-18)
会议时间：
MAY 17-21, 2010
会议地点：
Xian, PEOPLES R CHINA
会议主办单位：
[Wang, Jing-song;Bao, Zheng-lei;Chen, Si-guang] Univ South China, Hunan Key Lab Pollut Control & Resource Reuse, Sch Urban Construct, Hengyang 421001, Hunan, Peoples R China.^[Yang, Jin-hui] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.
关键词：
uranium;aqueous;chitosan;ferrous;discharge standard
摘要：
This study focuses on developing a new method to remove uranium from aqueous solution. Chitosan and ferrous ions were used together to remove uranium ions from aqueous solution. Through two-step pH adjustment, the uptake behavior of chitosan and ferrous ions toward uranium in aqueous solution using batch systems was studied in different experimental conditions. The experimental results indicated that the removal of uranium by the synergetic effect of chitosan and ferrous ions was more effective than the way of adsorbing uranium ions by chitosan alone. Under the given experimental conditions, the concentration of the residual uranium in the effluent after the chitosan and ferrous ion treatment could meet the discharge standard (< 0.05 mg l(-1)) when the initial concentration of uranium ions was 10 mg l(-1) or 100 mg l(-1). The synergetic effect of chitosan and ferrous ions, including adsorption, coacervation, and coprecipitation, was responsible for the high removal rate of uranium. [DOI: 10.1115/1.4002817]
摘要：
The effects of dosage, initial solution pH, adsorption time, initial U(VI)concentration and other factors on U(VI) removal rate by modified environmental protection activated carbon were studied. When the absorbent is 0.3g/L, the original U(VI) concentration is 10mg/L at pH 6, the equilibrium time of 120 min, The adsorption experimental results show the adsorption capability of modified environmental protection activated carbon is best, the adsorption removal rate reaches 97.61%, the adsorption capacity come to 32.54 mg/g.
摘要：
A uranium mill tailings, located in Guangdong, was selected for spatial distribution of the radon exhalation rates measured by local static method. The two-dimension surface of radon exhalation rates was established by Surfer using the data of spatial distribution of radon exhalation rates measured at August 14, 2007 to 19 and 21, which was analyzed by fractal method of projective covering. The results show that the two-dimension surface of radon exhalation rates is of fractal structure. The fractal dimension of surface of radon exhalation rates from August 14, 2007 to 19 and 21 are 2.0535, 2.0173, 2.0029, 2.0084, 2.0079, 2.0057 and 2.0034, respectively, which indicates that the complexity of spatial distribution of the radon exhalation rates at 14 and 15 are larger than that of the other days. The phenomenon results from the change of precipitation and temperature, as well as the features of uranium mill tailings, including mineral composition, particle size, radium content, porosity and pore connectivity, etc.
会议名称：
International Mining Forum 2010: Mine Safety and Efficient Exploitation Facing Challenge of the 21st Century
会议时间：
SEP 19-22, 2010
会议地点：
Huainan, PEOPLES R CHINA
会议主办单位：
[Zeng Sheng;Tan Kai-xuan;Qu Hui-qiong] Univ S China, Sch Nucl Resources & Nucl Fuel Engn, Hengyang 421001, Peoples R China.
关键词：
in situ leaching uranium;green mining of ore deposits;structure of ore rock;fractal feature
摘要：
The in situ leaching uranium is environmentally friendly mining technique that contains mining, mineral processing and metallurgical technology, in which the leaching solution is directly injected into underground ore bed and the useful metal or compound is obtained through reaction between solutions and minerals. The ore-bearing strata pore structure feature and ore rock particle distribution directly affect the leaching rate of useful components. In order to study the ore-bearing strata ore rock structure feature and its effect on in situ leaching uranium, based on analysis of mercury penetration test data of a certain uranium deposit with rock samples, several relative parameters are determined including porous radius size and distribution, porosity distribution. Using fractal theory, porous structure characteristics and variation of this ore-bearing and strata was analyzed, fractal characteristics of porous structure was discussed, and pore structure characteristics of this ore-bearing strata was further studied with scanning electron microscope. The results show that fractal characteristics of porous structure is regional, the fractal dimension can quantitatively describe heterogeneity of pore structure, the more the fractal dimension, the stronger the heterogeneity of porosity distribution, the more complicated the pore structure, and the less the porosity of ore rock. This is harmful for uranium leaching.
会议论文集名称：
PROGRESS IN SAFETY SCIENCE AND TECHNOLOGY SERIES
关键词：
uranium mine;dummy driving drift;maximal driving length;ventilation;radon and its progeny
摘要：
For giving some references to improve radiation condition of dummy driving drift in underground uranium mines, this paper expounds the mathematical description of radon concentration and potential alpha energy of its progeny in ventilation airflow, and educes the calculation formula of the maximal driving length of dummy driving drift for exhausting radon and its progeny. Then, this paper studies the relationships between the maximal driving length (L(max)) and air-quantity of ventilation system for dummy driving drift (Q), section area of dummy driving drift (S), radon concentration of intake air (C(0)), potential alpha energy of radon progeny (E(0)) of intake air and radon emanation density of dummy driving drift (D(v)) respectively, and obtains the below conclusions (i) L(max) is decreases with increased C(v), E(0), S and D(v) respectively, on the contrary increases with increased Q, (ii) when D(v)=1.463 Bq/(m(3)s), L(max,Rn)=L(max,alpha); when D(v)<1.463Bq/(m(3)s), L(max,Rn)>L(max,alpha); when D(v)>1.463 Bq/(m(3)s), L(max,Rn)<L(max,alpha). In this paper some optimization measures of reducing radon and its progeny also are given.
关键词：
Supercritical CO2 fluid;leaching of uranium;sandstone uranium ores
摘要：
Uranium is an important fuel for nuclear power, so the mining and milling of uranium is the base for development of nuclear power. Our experiments study is about the supercritical CO2 fluid extraction of uranium in low grade uranium ore, and the influence of aqueous medium, oxidants, chelating agents and other factors on the uranium leaching. In aqueous media, Fe-2 (SO4)(3) as the oxidants, supercritical CO2 fluid extraction of uranium has the best effect, the uranium leaching rate reaches 90.44%, significantly higher than that of the conventional acid and alkaline leaching. In the process of extraction of uranium in supercritical CO2 fluid, the uranium in uranium ore is first oxidized to hexavalent uranium, and then forms high solubility of uranyl carbonate complexes. Supercritical CO2 fluid is expected to be used in in-situ leaching of uranium mining of the low grade sandstone uranium deposits.
期刊：
PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCES IN ENERGY, ENVIRONMENT AND CHEMICAL ENGINEERING,2015年23:573-577 ISSN：2352-5401
通讯作者：
Sun, Bing
作者机构：
[Zhang, Qiuyang; Zhang, Haifeng; Sun, Bing] Univ South China, Inst Urban Construct, Hengyang 421001, Peoples R China.;[Zeng, Sheng] Univ South China, Sch Nucl Resources Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Sun, Bing] Univ South China, Inst Urban Construct, Hengyang 421001, Peoples R China.
会议名称：
International Conference on Advances in Energy, Environment and Chemical Engineering (AEECE)
会议时间：
SEP 26-27, 2015
会议地点：
Changsha, PEOPLES R CHINA
会议主办单位：
[Sun, Bing;Zhang, Haifeng;Zhang, Qiuyang] Univ South China, Inst Urban Construct, Hengyang 421001, Peoples R China.^[Zeng, Sheng] Univ South China, Sch Nucl Resources Engn, Hengyang 421001, Peoples R China.
会议论文集名称：
AER-Advances in Engineering Research
关键词：
rock mechanics;crossover jointed rock;uniaxial compression;numerical simulation
摘要：
The rock structure is extremely complex, it is difficult to reflect the mechanical properties and the relevant failure mechanisms truly under loads whatever by the theoretical analysis or the laboratory test. In order to analyze the damage characteristics of the crossover jointed rock mass from the microscopic point, the discrete method PFC2D was used to simulate the damage mechanism in the assured jointed rock numerically under Axial compression. The results show that when the angle of the main joint is consistent with the direction of the load, the varying angle between the minor joint and the main joint has rarely influence on the stress-strain curve of the rock mass, the stress when the first fine crack comes up and the peak; when the angle between the minor joint and the main joint is not changing, the peak value gradually reduces as the direction angle between the main joint and the load varying from 0 degrees to 90 degrees; when the peak comes up, the direction angle between the main joint and the load is 45 degrees or 90 degrees, the varying angle between the minor joint and the main joint has rarely influence on the development of the number of new fine cracks, while the angle between the main crack and the load is 0 degrees, the impact on the development of the number of new fine cracks is obvious.
关键词：
karsts crevasse;water-penetration and putty-gushing;aquifuge;mortar filling
摘要：
The "338"tin mine located on Baisha Town of Changning City in Hunan Province, the kaists crevasse grit-filled tin deposit, had a serious water-penetration and putty-gushing accident in 2# admission passage of 95m center-section, causing five-person dead on May 22, 2005. By analyzing the ore deposit hydrology geological data, the mining technology and the geologic structure, this paper concludes that the blasting during mining tunneling process destroying the aquifuge of karsts pipeline is the immediate cause of this accident, and the continuous raining increasing the hydrodynamic pressure in karsts pipeline is the important cause of this accident. This article has comprehensively analyzed the mechanism of water-penetration and putty-gushing, and carried on preliminary discussion on the geological forecast technology and the control technology of. the water-penetration and putty-gushing disaster.
摘要：
The effect of a complex surfactant on in situ leaching of low permeable sandstone uranium deposits is discussed, based on an Agitation leaching and a column leaching experiments. The results of the Agitation leaching experiment show that adding different concentrations surfactant into leaching solutions increases significantly the leaching rate of uranium. For a surfactant concentration of 10 mg/l, the leaching rate of uranium reaches maximum 92.6%. The results of the column leaching experiment show that adding 10mg/L surfactant into leaching solutions increases the permeability coefficient of ore-bearing layer 28.8% and the leaching rate of uranium 58.0%, resulting in 85.79%. The results of kinetic analysis show that extraction of uranium is controlled by diffusion with apparent rate constant of 0.0023/d without adding surfactant and by surface chemical reaction with apparent rate constant of 0.0077/d with adding surfactant. Thus, for low permeable sandstone uranium deposit, the in situ leaching mining is of great potential if adding the complex surfactant into leaching solutions.
摘要：
The effects of impurities ions on the quality of the metallic zinc powder in zinc alkaline leaching electrowinning process are researched. The experimental results indicated that the ions of CO32-,SO42-,SiO32-, F- have no influences on zinc Electrowinning and the maximum concentration of the chlorine ion should be controlled under 20g/L, the concentration of the sulfide ion has significant influence on electrowinning process, the quality of zinc decreased by 5% even under the slight amount of sulfide ion condition.
