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Tehrān, Iran

Abdollahy M.,TarbiatModaresUniversity | Mohseni M.,TarbiatModaresUniversity | Koleini S.M.,TarbiatModaresUniversity
26th International Mineral Processing Congress, IMPC 2012: Innovative Processing for Sustainable Growth - Conference Proceedings | Year: 2012

In this paper, the hydrophobicity of chalcopyrite particles produced with different laboratory mills has been studied; different grinding mechanism in themills made some changes in particles shape, Image Analysis (IA) method was used to determine the shape properties of chalcopyrite particles which are ground by a laboratory ball mill, rod mill and ceramic ball mill. The shape characters are stated in terms of shape factors such as circularity, convexity, roundness and regularity factor. Hallimond tube was used to float chalcopyrite particles followed by determination of critical surface tension of particles, this parameter used as a criterion to study the wetting behavior of chalcopyrite particles. The correlation between shape properties and critical surface tension of chalcopyrite particles showed that the hydrophobicity of chalcopyrite was affected by the shape. Investigations showed that the circular, round and more convex particles that produced with ceramic ball mill had lower hydrophobicity with higher critical surface tension (γc). The results also showed that the hydrophobicity of particles ground by ball and rod mills increased with the decrease of roundness, circularity, convexity and regularity factor of particles.

Rezaee A.,TarbiatModaresUniversity | Valipor F.,TarbiatModaresUniversity | Jonidi-Jafari A.,TarbiatModaresUniversity | Khavanin A.,TarbiatModaresUniversity | And 2 more authors.
Fresenius Environmental Bulletin | Year: 2012

The aim of this research was to study the Pseudomonas aeruginosa adsorption from air by clinoptilolite using response surface method (RSM). The obtained data were employed to assess the effects of clinoptilolite dose (g), air flow rate (L/min) and initial microbe concentration (CFU/mL) on the efficiency of clinoptilolite for Pseudomonas aeruginosa adsorption. The results showed that maximum adsorption efficiency was achieved at the following optimum conditions: an initial microbe concentration of 2000000 (CFU/mL), a clinoptilolite dose of 3 (g) and an airflow rate of 1.5 (L/min). Statistical checks indicated that the model was acceptable for representing the experimental data. The Langmuir, Freundlich and DubininRadushkevick isotherm models were used to describe Pseudomonas aeruginosa adsorption onto clinoptilolite. In accordance with the obtained correlation coefficients, the adsorption data showed that the Freundlich model was the most suitable for modeling Pseudomonas aeruginosa adsorption onto clinoptilolite (R2 = 0.948). The results indicated that the pseudo-second order kinetic model was the best of the kinetic models (R2= 0.999). © by PSP.

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