Key Laboratory of Ecological and Recycling Metallurgy

Beijing, China

Key Laboratory of Ecological and Recycling Metallurgy

Beijing, China
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Wang J.,Key Laboratory of Ecological and Recycling Metallurgy | Wang J.,University of Science and Technology Beijing | Shen S.,Key Laboratory of Ecological and Recycling Metallurgy | Shen S.,University of Science and Technology Beijing | And 3 more authors.
Process Biochemistry | Year: 2010

Dephosphorization of high-phosphorus iron ore is an unsolved problem worldwide so far. Biotechnology could be a cost-effective and environment-friendly way to solve this problem. A novel method for bioleaching of phosphorus from high-phosphorus iron ores using indigenous sulfur-oxidizing bacteria from municipal wastewaters was first reported in this work. Before bioleaching, the contents of phosphorus and iron from the high-phosphorus iron ore used were 1.04 and 47.89% (w/w), respectively. The effects of ore solid concentration on the phosphorus bioleaching were investigated. It was found most of phosphorus existed in the form of apatite in the iron ore. After bioleaching for 41 days, the final ore slurry pHs at all solid concentrations 10-300. g/L were between 0.09 and 0.63. The average contents of phosphorus and iron in the bioleaching solid residues were 0.21 and 51.7% (w/w), respectively. The average removal percentage of phosphorus and percentage of iron lost were 82.3 and 1.7%, respectively. After bioleaching, the high-phosphorus iron ore was suitable to be used in the manufacture of iron and steel. The optimal ore solid concentration for bioleaching of phosphorus was 250. g/L under the bioleaching conditions. Thus, this bioleaching process seems to be economic and effective. © 2010 Elsevier Ltd.


Shen S.,Key Laboratory of Ecological and Recycling Metallurgy | Shen S.,University of Science and Technology Beijing | Guishen L.,University of Science and Technology Beijing | Pan T.,University of Science and Technology Beijing | And 2 more authors.
Journal of Colloid and Interface Science | Year: 2011

Thermodynamic and kinetics studies for adsorption of Pt ions complexes from the chloride solutions obtained by leaching chlorinated spent automotive catalysts on anionic exchange resin Diaion WA21J were carried out. It was found that only Si, Pt, Rh and Pd from the solution were selectively adsorbed on the resin Diaion WA21J more strongly. The adsorption equilibrium time for Pt ions was about 20h. The isothermal adsorption of Pt ions was found to fit Langmuir, Freundlich and DKR models. The maximum monolayer adsorption capacities Qmax and Xm of Pt ions on the resin based on Langmuir and DKR model were 4.85, 5.36 and 5.69mg/g as well as 5.01, 5.63 and 5.98mg/g for temperatures 18°C, 28°C and 40°C, respectively. The apparent adsorption energy Ead based on DKR model were -11.79, -11.04 and -11.04kJ/mol for the temperatures 18°C, 28°C and 40°C, respectively. Ion exchange was the mechanism involved in the adsorption process. The adsorption of Pt ions on the resin underwent pseudo-first-order kinetic process, and the apparent adsorption activation energy Ea,1 was 12.6kJ/mol. The intraparticle diffusion of Pt ions was a main rate-controlling step in most of time of adsorption process. © 2011 Elsevier Inc.


Shen S.,Key Laboratory of Ecological and Recycling Metallurgy | Shen S.,University of Science and Technology Beijing | Pan T.,Key Laboratory of Ecological and Recycling Metallurgy | Liu X.,Key Laboratory of Ecological and Recycling Metallurgy | And 5 more authors.
Journal of Colloid and Interface Science | Year: 2010

It was found that Rh, Pd and Pt contained in the spent ceramic automotive catalysts could be effectively extracted by dry chlorination with chlorine. In order to concentrate Pd(II) contained in the chloride solution obtained from the dry chlorination process, thermodynamic and kinetics studies for adsorption of Pd(II) complexes from the chloride solutions on anionic exchange resin Diaion WA21J were carried out. It was found that Pd, Pt, Rh, Al, Fe, Si, Zn and Pb from the chloride solution could be adsorbed on the resin. The isothermal adsorption of Pd(II) was found to fit Freundlich, Langmuir and Dubinin-Kaganer-Radushkevich models under the adsorption conditions. The adsorption of Pd(II) on the resin was favorable according to the values of 1/n and RL from Freundlich and Langmuir adsorption isotherms, respectively. The maximum monolayer adsorption capacities Qmax based on Langmuir adsorption isotherms were 5.70, 4.84 and 4.05 mg/g and the corresponding value Xm based on Dubinin-Kaganer-Radushkevich were 5.55, 4.69 and 4.01 mg/g at temperatures 18 °C, 28 °C and 40 °C, respectively. The apparent adsorption energies (Ead) based on Dubinin-Kaganer-Radushkevich isotherm were -15.43, -16.22 and -23.57 kJ/mol for the temperatures 18 °C, 28 °C and 40 °C, respectively. Chemical adsorption was a main mechanism involved in the adsorption process. Pd(II) adsorption on the resin could be accelerated by increasing the adsorption temperature. The adsorption of Pd(II) from the chloride solution on the resin underwent pseudo-first order kinetic process and the apparent adsorption activation energy Ea was 15.0 kJ/mol. The intra-particle diffusion was a main rate controlling step in the Pd(II) adsorption process under the adsorption conditions. © 2010 Elsevier Inc. All rights reserved.


Shen S.,Key Laboratory of Ecological and Recycling Metallurgy | Shen S.,University of Science and Technology Beijing | Pan T.,Key Laboratory of Ecological and Recycling Metallurgy | Liu X.,Key Laboratory of Ecological and Recycling Metallurgy | And 5 more authors.
Journal of Hazardous Materials | Year: 2010

It was found that Rh, Pd and Pt contained in the spent ceramic automotive catalysts could be effectively extracted by dry chlorination with chlorine. In order to concentrate Rh(III) ions contained in the chloride solutions obtained, thermodynamic and kinetics studies for adsorption of Rh(III) complexes from the chloride solutions on an anionic exchange resin Diaion WA21J were carried out. Rh, Pd, Pt, Al, Fe, Si, Zn and Pb from the chloride solution could be adsorbed on the resin. The distribution coefficients (Kd) of Rh(III) decreased with the increase in initial Rh(III) concentration or in adsorption temperature. The isothermal adsorption of Rh(III) was found to fit Langmuir, Freundlich and Dubinin-Kaganer-Radushkevich models under the adsorption conditions. The maximum monolayer adsorption capacities Qmax based on Langmuir adsorption isotherms were 6.39, 6.61 and 5.81mg/g for temperatures 18, 28 and 40°C, respectively. The apparent adsorption energy of Rh was about -7.6kJ/mol and thus Rh(III) adsorption was a physical type. The experimental data obtained could be better simulated by pseudo-first-order kinetic model and the activation energy obtained was 6.54J/mol. The adsorption rate of Rh(III) was controlled by intraparticle diffusion in most of time of adsorption process. © 2010 Elsevier B.V.


PubMed | Key Laboratory of Ecological and Recycling Metallurgy
Type: Journal Article | Journal: Journal of colloid and interface science | Year: 2010

It was found that Rh, Pd and Pt contained in the spent ceramic automotive catalysts could be effectively extracted by dry chlorination with chlorine. In order to concentrate Pd(II) contained in the chloride solution obtained from the dry chlorination process, thermodynamic and kinetics studies for adsorption of Pd(II) complexes from the chloride solutions on anionic exchange resin Diaion WA21J were carried out. It was found that Pd, Pt, Rh, Al, Fe, Si, Zn and Pb from the chloride solution could be adsorbed on the resin. The isothermal adsorption of Pd(II) was found to fit Freundlich, Langmuir and Dubinin-Kaganer-Radushkevich models under the adsorption conditions. The adsorption of Pd(II) on the resin was favorable according to the values of 1/n and R(L) from Freundlich and Langmuir adsorption isotherms, respectively. The maximum monolayer adsorption capacities Q(max) based on Langmuir adsorption isotherms were 5.70, 4.84 and 4.05 mg/g and the corresponding value X(m) based on Dubinin-Kaganer-Radushkevich were 5.55, 4.69 and 4.01 mg/g at temperatures 18 degrees C, 28 degrees C and 40 degrees C, respectively. The apparent adsorption energies (E(ad)) based on Dubinin-Kaganer-Radushkevich isotherm were -15.43, -16.22 and -23.57 kJ/mol for the temperatures 18 degrees C, 28 degrees C and 40 degrees C, respectively. Chemical adsorption was a main mechanism involved in the adsorption process. Pd(II) adsorption on the resin could be accelerated by increasing the adsorption temperature. The adsorption of Pd(II) from the chloride solution on the resin underwent pseudo-first order kinetic process and the apparent adsorption activation energy E(a) was 15.0 kJ/mol. The intra-particle diffusion was a main rate controlling step in the Pd(II) adsorption process under the adsorption conditions.


PubMed | Key Laboratory of Ecological and Recycling Metallurgy
Type: Journal Article | Journal: Journal of hazardous materials | Year: 2010

It was found that Rh, Pd and Pt contained in the spent ceramic automotive catalysts could be effectively extracted by dry chlorination with chlorine. In order to concentrate Rh(III) ions contained in the chloride solutions obtained, thermodynamic and kinetics studies for adsorption of Rh(III) complexes from the chloride solutions on an anionic exchange resin Diaion WA21J were carried out. Rh, Pd, Pt, Al, Fe, Si, Zn and Pb from the chloride solution could be adsorbed on the resin. The distribution coefficients (K(d)) of Rh(III) decreased with the increase in initial Rh(III) concentration or in adsorption temperature. The isothermal adsorption of Rh(III) was found to fit Langmuir, Freundlich and Dubinin-Kaganer-Radushkevich models under the adsorption conditions. The maximum monolayer adsorption capacities Q(max) based on Langmuir adsorption isotherms were 6.39, 6.61 and 5.81 mg/g for temperatures 18, 28 and 40 degrees C, respectively. The apparent adsorption energy of Rh was about -7.6 kJ/mol and thus Rh(III) adsorption was a physical type. The experimental data obtained could be better simulated by pseudo-first-order kinetic model and the activation energy obtained was 6.54 J/mol. The adsorption rate of Rh(III) was controlled by intraparticle diffusion in most of time of adsorption process.


PubMed | Key Laboratory of Ecological and Recycling Metallurgy
Type: Journal Article | Journal: Journal of colloid and interface science | Year: 2011

Thermodynamic and kinetics studies for adsorption of Pt ions complexes from the chloride solutions obtained by leaching chlorinated spent automotive catalysts on anionic exchange resin Diaion WA21J were carried out. It was found that only Si, Pt, Rh and Pd from the solution were selectively adsorbed on the resin Diaion WA21J more strongly. The adsorption equilibrium time for Pt ions was about 20 h. The isothermal adsorption of Pt ions was found to fit Langmuir, Freundlich and DKR models. The maximum monolayer adsorption capacities Q(max) and X(m) of Pt ions on the resin based on Langmuir and DKR model were 4.85, 5.36 and 5.69 mg/g as well as 5.01, 5.63 and 5.98 mg/g for temperatures 18C, 28C and 40C, respectively. The apparent adsorption energy E(ad) based on DKR model were -11.79, -11.04 and -11.04 kJ/mol for the temperatures 18C, 28C and 40C, respectively. Ion exchange was the mechanism involved in the adsorption process. The adsorption of Pt ions on the resin underwent pseudo-first-order kinetic process, and the apparent adsorption activation energy E(a,1) was 12.6 kJ/mol. The intraparticle diffusion of Pt ions was a main rate-controlling step in most of time of adsorption process.

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