摘要：
Zinc neutral leaching residue (ZNLR) from hydrometallurgical zinc smelting processing can be determined as hazardous intermediate containing considerable amounts of Cd and Zn which have great threats to the environment. The ZNLR contained approximately 35.99% Zn, 15.93% Fe and 0.26% Cd, and Cd mainly existed as ferrites in the ZNLR in this research. Reductive acid leaching of ZNLR was investigated. The effects of hydrazine sulfate concentration, initial sulfuric acid concentration, temperature, duration and liquid-to-solid ratio on the extraction of Cd, Zn and Fe were examined. The extraction efficiencies of Cd, Zn and Fe reached 90.81%, 95.83% and 94.19%, respectively when the leaching parameters were fixed as follows:hydrazine sulfate concentration, 33.3 g/L; sulfuric acid concentration, 80 g/L; temperature, 95 ℃; duration of leaching, 120 min; liquid-to-solid ratio, 10 mL/g and agitation, 400 r/min. XRD and SEM-EDS analyses of the leaching residue confirmed that lead sulfate (PbSO_4) and hydrazinium zinc sulfate((N_2H_5)_2Zn(SO_4)_2) were the main phases remaining in the reductive leaching residue.
摘要：
In this work, zinc neutral leaching residue was mechanically activated by ball-milling. The subsequent leaching behavior and kinetics of cadmium extraction in a mixed SO2-H2SO4 system were studied. Changes in the crystalline phase, lattice distortion, particle size and morphology, which were induced by mechanical activation, were also investigated. The activated samples showed different physicochemical characteristics, and cadmium extraction was found to be easier than for the un-activated samples. Under the same conditions, mechanical activation contributed to higher cadmium leaching. The cadmium extraction kinetics at 75–95°C was found to fit the shrinking core model. The raw neutral leaching residue, and the samples activated for 60 min and 120 min had a calculated activation energy of 65.02 kJ/mol, 59.45 kJ/mol and 53.46 kJ/mol, respectively. The leaching residue was characterized by ICP, XRD and SEM analysis. According to XRD analysis, the main phases in the residue were lead sulfate (PbSO4), zinc sulfide (ZnS) and cadmium sulfide (CdS).
摘要：
Enhanced reductive leaching of cadmium from zinc neutral leaching residue, along with zinc and iron, was conducted using sulfur dioxide as reductant. Cadmium mainly exists as cadmium-bearing zinc ferrite (CdxZn(1-x)Fe2O4) (x = 0~1). The influence of variables on the extraction rates of cadmium, zinc, and iron was studied. The results showed the maximum extraction of cadmium, zinc, and iron reached 99.11%, 93.43%, and 93.38% under the optimum conditions. The raw and the reductive leaching residue were characterized by XRD, ICP, and SEM-EDX analysis. Lead sulfate, zinc, and cadmium sulfide are the main phases contained in the reductive leaching residue.
作者机构：
[郭际明; 黄长军; 喻小东] School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China;[聂智平; 黄长军] School of Municipal and Surveying Engineering, Hunan City University, Yiyang 413000, China
通讯机构：
School of Geodesy and Geomatics, Wuhan University, China
作者机构：
College of Electrical and Information Engineering, Hunan University, Changsha;410082, China;College of Municipal and Surveying Engineering, Hunan City University, Yiyang;413000, China;[黎灿兵; 王煌; 耿英会; 曹一家; 石海清] College of Electrical and Information Engineering, Hunan University, Changsha
通讯机构：
[Li, C.] C;College of Electrical and Information Engineering, Hunan University, Changsha, China
作者机构：
[郭际明; 袁长征; 喻小东; 黄长军] School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China;[黄长军] School of Municipal and Surveying Engineering, Hunan City University, Yiyang 413000, China
通讯机构：
[Guo, J.] S;School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China
作者机构：
[肖建清] School of Civil Engineering and Architecture, Anyang Normal University, Anyang, Henan 455002, China;[张腊春] College of Municipal and Surveying Engineering, Hunan City University, Yiyang, Hunan 413000, China;[冯夏庭; 肖建清; 邱士利] State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China
通讯机构：
School of Civil Engineering and Architecture, Anyang Normal University, China
作者机构：
[李云; 刘霁] College of Surveying and Mapping Engineering, Hunan City University, Yiyang 413000, China;[刘霁] School of Resource and Safety Engineering, Central South University, Changsha 410083, China
通讯机构：
College of Surveying and Mapping Engineering, Hunan City University, China
作者机构：
[肖建清] School of Civil Engineering and Architecture, Anyang Normal University, Anyang, Henan 455000, China;[张腊春] College of Municipal and Surveying Engineering, Hunan City University, Yiyang, Hunan 413000, China;[冯夏庭; 肖建清; 邱士利] State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China
通讯机构：
School of Civil Engineering and Architecture, Anyang Normal University, China
作者机构：
[郭际明; 黄长军; 陈元洪; 喻小东] School of Geodesy and Geomatics, Wuhan University, 129 Luoyu Road, Wuhan 430079, China;[黄长军] School of Municipal and Surveying Engineering, Hunan City University, 238 West Yiyang Road, Yiyang 413000, China
通讯机构：
School of Geodesy and Geomatics, Wuhan University, 129 Luoyu Road, China
摘要：
Based on the grey system theory, through the analysis of the theory flaw of the GM (1,1) prediction model, taking into the linear trend and the exponential growth trend of the settlement monitoring data series, and using the sequence operator role to enhance the smoothness of the original sequence data, combined with the characteristics of GM (1,1) and the linear regression, this paper presents a new and improved combination forecasting mode. Compared the traditional model, the accuracy of the improved method has been greatly enhanced, and the improved method will better meet the practical requirements.
摘要：
A modified peat was prepared by using nitrate and natural peat from Yiyang city in Hunan Province. The adsorption properties of the nitrifying peat for Methylene blue was investigated in aqueous solution. The effect of the adsorbent dosage, time and the initial concentration of methylene blue on the adsorption capability was discussed. The result showed that time and the adsorbent dosage had greater influence on the adsorption of Methylene blue, the adsorption of Methylene blue by Nitrifying peat was a rapid process, and in 20 min in the adsorption rate reached more and 60%, the adsorption amount was approximately proportional to the initial concentration( 20-100 mg /L). Langmuir and Freundlich isotherms were used to fit the equilibrium data, and it was found that the adsorption isotherm followed the Langmuir model.
作者机构：
[施周; 张骅; 张伟; 张茜; 徐舜开] College of Civil Engineering, Hunan Univ., Changsha, Hunan 410082, China;[施周; 张骅; 张伟; 张茜; 徐舜开] Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Hunan Univ., Changsha, Hunan 410082, China;[张伟] Dept. of Urban Construction, Hunan City Univ., Yiyang, Hunan 413000, China
通讯机构：
College of Civil Engineering, Hunan Univ., China
作者机构：
[李云; 刘霁] School of Surveying and Mapping and Municipal Engineering, Hunan City University, Yiyang 413000, China;[刘霁] School of Resource and Safety Engineering, Central South University, Changsha 410083, China
通讯机构：
School of Surveying and Mapping and Municipal Engineering, Hunan City University, China
期刊：
International Review on Computers and Software,2012年7(6):2880-2885 ISSN：1828-6003
通讯作者：
Huang, C.
作者机构：
[Guo, Jiming; Yuan, Changzheng; Yu, Xiaodong; Huang, Changjun] School of Geodesy and Geomatics, Wuhan University, Wuhan, 430079, China;[Huang, Changjun] School of Municipal and Surveying Engineering, Hunan City University, Yiyang, 413000, China
通讯机构：
School of Geodesy and Geomatics, Wuhan University, China
期刊：
Journal of Computational Information Systems,2012年8(24):10223-10230 ISSN：1553-9105
通讯作者：
Tan, Y.(tanyue7409@163.com)
作者机构：
[Tan, Guanzheng; Tan, Yue] School of Information Science and Engineering, Central South University, Changsha 410083, China;[Tan, Quanyuan] School of Municipal Administration and Mapping Engineering, Hunan City University, Yiyang 413000, China;[Ye, Yong; Yang, Bing; Tan, Yue] School of Communication and Electronic Engineering, Hunan City University, Yiyang 413000, China
通讯机构：
School of Information Science and Engineering, Central South University, China
关键词：
Chaotic local search;Genetic algorithm;Mixed integer programming;Multi-dimension;Single-dimension
摘要：
The dewatering and mineralization of sludge in the constructed reed bed was investigated in this study.The sludge from the secondary sedimentation tank is from in the wastewater treatment plant in Yiyang city,Hunan province.Anaerobic pond and oxidation ditch biological treatment processes is accepted there.The performance of the system was monitored for one year. Total Solids (TS), Volatile Solids(VS), Chemical Oxygen Demand, nutrients (TKN) and Total Phosphorus(TP), heavy metals in the sludge were analysed.The removal rate of COD,NH4-N,and TP of the percolated fluid for the first cycle was also monitored. TS content reached 36.5% for the surface layer and 37.8% for the bottom layer at the end of the examination period.Sludge stabilization in the bed was also observed(VS content decreased to 31.3% and 13.4% respectively for the surface and bottom layer).Concentration of nutrients of the sludge accumulated in the bed also decreased. The heavy metal concentration meets the European Union standards for heavy metals in case of agricultural disposal of the treated sludge.
作者机构：
[吴德华; 吴湘滨; 葛丽萍; 刘江龙; 侯东壮] Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education, Central South University, Changsha 410083, China;[吴德华] Department of Urban Construction, Hunan City University, Yiyang 413000, China;[吴德华; 吴湘滨; 葛丽萍; 刘江龙] School of Geosciences and Info-Physics, Central South University, Changsha 410083, China
通讯机构：
Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education, Central South University, China
作者机构：
[施周; 张骅; 张伟; 徐舜开] College of Civil Engineering, Hunan Univ, Changsha, Hunan 410082, China;[施周; 张骅; 张伟; 徐舜开] Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education, Hunan Univ, Changsha, Hunan 410082, China;[张伟] Dept of Urban Construction, Hunan City Univ, Yiyang, Hunan 413000, China
通讯机构：
College of Civil Engineering, Hunan Univ, China
