Authentication email has already been sent, please check your email box: and activate it as soon as possible.
You can login to My Profile and manage your email alerts.
If you haven’t received the email, please:
|
|
There are 4 papers published in subject: > since this site started. |
Results per page: |
Select Subject |
Select/Unselect all | For Selected Papers |
Saved Papers
Please enter a name for this paper to be shown in your personalized Saved Papers list
|
1. Bioleaching of chalcopyrite and marmatite by moderately thermophilic bacteria: An investigation of their interactions Stepwise bioleaching process | |||
WANG Jun,ZHAO Hongbo,TAO Lang,CAO Pan,QIN Wenqing,QIU Guanzhou | |||
Metallurgical Engineering 07 January 2015 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract: Chalcopyrite and marmatite are associated together most of the time in the raw ores and flotation concentrates. In this work, the interactions between chalcopyrite and marmatite during bioleaching by moderately thermophilic bacteria were investigated mainly by electrochemical measurements and bioleaching experiments. In the initial stage of bioleaching of mixture of chalcopyrite and marmatite, the dissolution of marmatite was preferential, and was significantly accelerated with the addition of chalcopyrite because of the galvanic effect and catalytic effect of Cu2+ ions, while the dissolution of chalcopyrite was inhibited mainly due to the galvanic effect before the accomplishment of dissolution of marmatite. Chalcopyrite dissolved fast when the dissolution of marmatite finished, and small amount of marmatite cannot inhibit the final copper extraction of chalcopyrite if leaching time was long enough. Therefore, stepwise or selective bioleaching was feasible in processing mixture of chalcopyrite and marmatite to avoid complex flotation process in separating chalcopyrite and marmatite. ) | |||
TO cite this article:WANG Jun,ZHAO Hongbo,TAO Lang, et al. Bioleaching of chalcopyrite and marmatite by moderately thermophilic bacteria: An investigation of their interactions Stepwise bioleaching process[OL].[ 7 January 2015] http://en.paper.edu.cn/en_releasepaper/content/4625975 |
2. Isotherm, kinetics and thermodynamic studies of adsorption of Cu2+ from aqueous solutions by Mg2+/K+ type orange peel adsorbents | |||
Guo Xueyi,Liang Sha,Feng Ningchuan,Tian Qinghua | |||
Metallurgical Engineering 03 July 2009 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Orange peel was used as raw material to prepare two novel orange peel adsorbents MgOP and KOP. FTIR and SEM were used to characterize the adsorbents. Effects of pH, solid/liquid ratio, time and metal ion concentration on the Cu2+ adsorption were investigated by these two adsorbents. The equilibrium data were analyzed by using Langmuir, Freudlich, Temkin and Dubinin-Radushkevich models. Langmuir model provides the best correlation for the adsorption of Cu2+ by both MgOP and KOP, and the mono-layer adsorption capacity for Cu2+ removal by MOP and KOP are 40.37 and 59.77mg/g, respectively. The adsorbed amounts of Cu2+ increased with the increase in contact time and reached equilibrium within 20min. Kinetics data were analyzed using four adsorption kinetic models: the pseudo-first and second-order equations, the Elovich equation and intraparticle diffusion equation. The experimental data fit well the pseudo-second-order equation, which indicates the adsorption of Cu2+ by MgOP and KOP may follow a chemisorption mechanism. Thermodynamic studies showed the spontaneous, exothermic nature of the adsorption of Cu2+ by MgOP and KOP. | |||
TO cite this article:Guo Xueyi,Liang Sha,Feng Ningchuan, et al. Isotherm, kinetics and thermodynamic studies of adsorption of Cu2+ from aqueous solutions by Mg2+/K+ type orange peel adsorbents [OL].[ 3 July 2009] http://en.paper.edu.cn/en_releasepaper/content/33622 |
3. Application of orange peel xanthate for the adsorption of Pb2+ from aqueous solutions | |||
Liang Sha,Guo Xueyi,Feng Ningchuan,Tian Qinghua | |||
Metallurgical Engineering 24 January 2009 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Pristine orange peel was chemically modified by introducing sulphur groups with the carbon disulfide treatment in alkaline medium. The presence of sulphur groups on orange peel xanthate were identified by FTIR spectroscopic study. Equilibrium isotherms and kinetics were obtained and the effect of various parameters including equilibrium pH, contact time, temperature and initial ion concentration on adsorption of Pb2+ were studied by batch experiments. The maximum adsorption capacity of orange peel xanthate was 204.50 mg•g-1, which was found to increase by about 150% compared to that of pristine orange peel. The adsorption process can attain equilibrium within 20 min, and kinetics was found to be best-fit pseudo-second order equation. Temperature has little effect on the adsorption capacity of orange peel xanthate. In addition, the adsorption mechanism was proposed. | |||
TO cite this article:Liang Sha,Guo Xueyi,Feng Ningchuan, et al. Application of orange peel xanthate for the adsorption of Pb2+ from aqueous solutions[OL].[24 January 2009] http://en.paper.edu.cn/en_releasepaper/content/28314 |
4. Adsorption of copper and cadmium ions from aqueous solution by chemically modified orange peel | |||
Liang Sha,Guo Xueyi,Feng Ningchuan,Tian Qinghua | |||
Metallurgical Engineering 22 January 2009 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:The present article describes the adsorption behaviors of Cu2+ and Cd2+ on chemically modified waste orange peel. The adsorbents were characterized using scanning electron microscopy and infrared spectrophotometer. The effect of various parameters like solution pH, shaking time, initial metal ion concentration and temperature on adsorption efficiencies of these two metals were studied systematically by batch experiments.. Adsorption isotherms of these two metals on orange peel and chemically modified orange peel were obtained and compared with Langmuir and Freundlich type models. The rate of adsorption of Cu2+ and Cd2+ on chemically modified orange peel at a constant temperature (25 oC) found to follow a pseudo-second order equation, indicating their chemical adsorption. Temperature has a negative impact on Cu2+ adsorption, while Cd2+ adsorption found to be more or less independent of temperature. Maximum adsorption capacities of Cu2+ and Cd2+ on the chemically modified orange peel were found to be 70.67 and 136.05 mg/g, respectively. Adsorption–desorption studies made on chemically modified orange peel showed that, the adsorption capacities remain high until 5th cycle. This study demonstrated that, the waste orange peel after simple chemical treatment could be used as a potential adsorbent for toxic metals such as Cu and Cd. | |||
TO cite this article:Liang Sha,Guo Xueyi,Feng Ningchuan, et al. Adsorption of copper and cadmium ions from aqueous solution by chemically modified orange peel[OL].[22 January 2009] http://en.paper.edu.cn/en_releasepaper/content/28246 |
Select/Unselect all | For Selected Papers |
Saved Papers
Please enter a name for this paper to be shown in your personalized Saved Papers list
|
|
Results per page: |
About Sciencepaper Online | Privacy Policy | Terms & Conditions | Contact Us
© 2003-2012 Sciencepaper Online. unless otherwise stated