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Détail de l'auteur
Auteur Mohammad A. Behnajady
Documents disponibles écrits par cet auteur
Affiner la rechercheDetermination of the optimum conditions for the leaching of lead from zinc plant residues in NaCl – H2SO4 – Ca (OH)2 media by the taguchi method / Bahram Behnajady in Industrial & engineering chemistry research, Vol. 51 N° 10 (Mars 2012)
[article]
in Industrial & engineering chemistry research > Vol. 51 N° 10 (Mars 2012) . - pp. 3887–3894
Titre : Determination of the optimum conditions for the leaching of lead from zinc plant residues in NaCl – H2SO4 – Ca (OH)2 media by the taguchi method Type de document : texte imprimé Auteurs : Bahram Behnajady, Auteur ; Javad Moghaddam, Auteur ; Mohammad A. Behnajady, Auteur Année de publication : 2012 Article en page(s) : pp. 3887–3894 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Leaching Taguchi method Résumé : This research is part of a continuing effort to reduce environmental conflicts and occupational hazards of lead-bearing zinc plant residues (ZPRs), and to break through this problem and recover lead of the wastes. The residue with an assay of 14.4% Pb was used in chloride leaching for lead recovery, and sulfate was controlled in the leaching stage by the addition of Ca(OH)2. In this paper, the effects of influential factors on extraction efficiency of Pb from ZPRs were investigated. Taguchi’s method based on orthogonal array design (OAD) has been used to arrange the experimental runs in order to maximize lead extraction from a ZPR. Orthogonal array (OA) L8(27) consisting of seven parameters, each with two levels, was employed to evaluate the effects of NaCl concentration (C = 300 and 400 g/L), stirring speed (R = 500 and 700 rpm), reaction temperature (T = 55 and 65 ◦C), reaction time (t = 1 and 8 h), liquid-to-solid ratio (L/S = 6 and 20), acidic pH (pHa = 2 and 3.5), and neutral pH (pHb = 4 and 5.5) on lead extraction percent. Statistical analysis, ANOVA, was also employed to determine the relationship between experimental conditions and yield levels. The results showed that the pulp density, and NaCl concentration were significant parameters, and increasing pulp density reduced leaching efficiency of lead. However, increasing NaCl concentration promoted the extraction of lead. The obtained optimum conditions from this study were C2, 400 g/L; R2, 700 rpm; T1, 55 °C; t1, 1 h; (L/S)2, 20; (pHa)2, 3.5; and (pHb)1, 4. But only two significant factors (C2, 400 g/L; and (L/S)2, 20) were used to estimate the performance at the optimum conditions. The calculated leaching percent (85.91%) was in reasonable agreement with the experimental results in optimum conditions. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202571x [article] Determination of the optimum conditions for the leaching of lead from zinc plant residues in NaCl – H2SO4 – Ca (OH)2 media by the taguchi method [texte imprimé] / Bahram Behnajady, Auteur ; Javad Moghaddam, Auteur ; Mohammad A. Behnajady, Auteur . - 2012 . - pp. 3887–3894.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 10 (Mars 2012) . - pp. 3887–3894
Mots-clés : Leaching Taguchi method Résumé : This research is part of a continuing effort to reduce environmental conflicts and occupational hazards of lead-bearing zinc plant residues (ZPRs), and to break through this problem and recover lead of the wastes. The residue with an assay of 14.4% Pb was used in chloride leaching for lead recovery, and sulfate was controlled in the leaching stage by the addition of Ca(OH)2. In this paper, the effects of influential factors on extraction efficiency of Pb from ZPRs were investigated. Taguchi’s method based on orthogonal array design (OAD) has been used to arrange the experimental runs in order to maximize lead extraction from a ZPR. Orthogonal array (OA) L8(27) consisting of seven parameters, each with two levels, was employed to evaluate the effects of NaCl concentration (C = 300 and 400 g/L), stirring speed (R = 500 and 700 rpm), reaction temperature (T = 55 and 65 ◦C), reaction time (t = 1 and 8 h), liquid-to-solid ratio (L/S = 6 and 20), acidic pH (pHa = 2 and 3.5), and neutral pH (pHb = 4 and 5.5) on lead extraction percent. Statistical analysis, ANOVA, was also employed to determine the relationship between experimental conditions and yield levels. The results showed that the pulp density, and NaCl concentration were significant parameters, and increasing pulp density reduced leaching efficiency of lead. However, increasing NaCl concentration promoted the extraction of lead. The obtained optimum conditions from this study were C2, 400 g/L; R2, 700 rpm; T1, 55 °C; t1, 1 h; (L/S)2, 20; (pHa)2, 3.5; and (pHb)1, 4. But only two significant factors (C2, 400 g/L; and (L/S)2, 20) were used to estimate the performance at the optimum conditions. The calculated leaching percent (85.91%) was in reasonable agreement with the experimental results in optimum conditions. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202571x Enhancement of Removal rate of an organic pollutant in the presence of immobilized TiO2 nanoparticles with inorganic anions combination / Mohammad A. Behnajady in Industrial & engineering chemistry research, Vol. 51 N° 47 (Novembre 2012)
[article]
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15324–15330
Titre : Enhancement of Removal rate of an organic pollutant in the presence of immobilized TiO2 nanoparticles with inorganic anions combination : Optimization using taguchi approach Type de document : texte imprimé Auteurs : Mohammad A. Behnajady, Auteur ; Mahsa Hajiahmadi, Auteur ; Nasser Modirshahla, Auteur Année de publication : 2013 Article en page(s) : pp. 15324–15330 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Organic pollutant Nanoparticles Optimization Résumé : In this paper, the effect of various inorganic anions, NO3–, HCO3–, SO42–, Cl–, and H2PO4–, in the removal of C.I. Acid Red 17 (AR17), as a model dye pollutant, was investigated in the presence of TiO2 nanoparticles immobilized on a glass plate and optimized using the Taguchi method. Sixteen experiments were required to study the effects of anions in different concentrations. It was found that the nature and concentration of inorganic anions significantly affected the removal rate of AR17 in the presence of immobilized TiO2. The results indicated that high concentrations of NO3– and HCO3– especially in combined mode can improve the AR17 removal rate in the presence of supported TiO2. For the first time, we reported 22 times increase in the AR17 removal rate in the presence of immobilized TiO2 with combined inorganic anions. Among the mentioned anions, NO3– ions had the most contribution in increasing the removal rate and H2PO4– ions had the highest role in decreasing it. Results indicated that this method can be a useful, promising, and cost-effective method for increasing removal rate of organic pollutants in the fixed-bed system. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301521z [article] Enhancement of Removal rate of an organic pollutant in the presence of immobilized TiO2 nanoparticles with inorganic anions combination : Optimization using taguchi approach [texte imprimé] / Mohammad A. Behnajady, Auteur ; Mahsa Hajiahmadi, Auteur ; Nasser Modirshahla, Auteur . - 2013 . - pp. 15324–15330.
Industrial chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 51 N° 47 (Novembre 2012) . - pp. 15324–15330
Mots-clés : Organic pollutant Nanoparticles Optimization Résumé : In this paper, the effect of various inorganic anions, NO3–, HCO3–, SO42–, Cl–, and H2PO4–, in the removal of C.I. Acid Red 17 (AR17), as a model dye pollutant, was investigated in the presence of TiO2 nanoparticles immobilized on a glass plate and optimized using the Taguchi method. Sixteen experiments were required to study the effects of anions in different concentrations. It was found that the nature and concentration of inorganic anions significantly affected the removal rate of AR17 in the presence of immobilized TiO2. The results indicated that high concentrations of NO3– and HCO3– especially in combined mode can improve the AR17 removal rate in the presence of supported TiO2. For the first time, we reported 22 times increase in the AR17 removal rate in the presence of immobilized TiO2 with combined inorganic anions. Among the mentioned anions, NO3– ions had the most contribution in increasing the removal rate and H2PO4– ions had the highest role in decreasing it. Results indicated that this method can be a useful, promising, and cost-effective method for increasing removal rate of organic pollutants in the fixed-bed system. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301521z