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RISS 인기검색어
- 검색키워드
- 저자 : Asghar Azizi (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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Influence of collector dosage and pulp chemistry on copper flotation
Asghar Azizi 한국자원공학회 2014 Geosystem engineering Vol.17 No.6
This study was aimed to examine the influence of collector dosage, pH, solid content and water type of flotation pulp on copper recovery. The results indicated that recovery was strongly affected by these factors and their influence on the best composition of copper grade and recovery was in the order of water type>solid percentage>collector dosage>pulp pH. As the value of collector dosage, pH and solid content increased to a certain value, the copper recovery was enhanced to a peak and thereafter decreased. This may be due to the balance between reagent concentrations with pH and solid percentage. Copper recovery significantly increased with changing the water type from tap water to distilled water. The best combination of grade and recovery obtained was 7.26% and 81.09% in flotation tests with tap water.
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Ahad Zare,Asghar Azizi,Mohammad Karamoozian 한국자원공학회 2020 Geosystem engineering Vol.23 No.1
This study was aimed to increase the floatability of oxide copper from a complex copper sample. For this purpose, sulphidisation processes such as slug and controlled potential sulphidisation (CPS) and hydroxamate and potassium amyl xanthate (Z6) collectors were utilized and their results were compared with real conditions. The results indicated that about 9.46% of the recovery of oxide copper increased using 300g/t ammonium sulphide in the first step, and reached to 77.12%. Also, in this case, the recovery of sulphide copper was significantly improved. In addition, the findings demonstrated that applying 10 g/t of potassium octyl hydroxamate anionic collector, the recovery of oxide copper reached to 74.47% without any negative effect on the recovery of sulphide copper. Meanwhile, the simultaneous use of Z11 and Z6 as collector caused to increase about 3.63% of the recovery of oxide copper (71.29%). It was also found that the highest recovery of oxide copper could be obtained using CPS method and in this case, 10.34% of the oxide copper and 4.48% of the total copper improved and also the dosage of (NH4)2S decreased.
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Rasoul Khosravi,Asghar Azizi,Reza Ghaedrahmati,Vinod Kumar Gupta,Shilpi Agarwal 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.54 No.-
This study investigates the behavior of gold adsorption from cyanide leaching solution onto activated coconut shell carbon. The experimental was designed according to CCD implemented with RSM and a quadratic model was developed for regression analysis. The effects of important parameters including pH, agitation rate, adsorbent concentration and adsorption time were studied to find the best operating conditions, and the optimized value of pH, agitation rate, activated carbon concentration and adsorption time was found to be 11, 40 rpm,1.25 g/L and 3 h, respectively. Under these conditions, the adsorption rate was found to be about 87.11%. Also, the optimal conditions were established on industrial cyanide leaching solution and the results demonstrated that adsorption rate of gold could be obtained about 89.25%. Adsorption behavior was kinetically investigated using pseudo first-order and pseudo secondorder models among which data were mostly correlated to pseudo first-order model. The further analysis of kinetics indicated that intra-particle diffusion was the rate-limiting step. Adsorbate–adsorbent interactions at 298 k was assessed by Langmuir, Freundlich, and Temkin isotherm models from which Freundlich model had the highest consistency with the experimental data.
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Dietary L-Arginine Intakes and the Risk of Metabolic Syndrome
Parvin Mirmiran,Sajjad Khalili Moghadam,Zahra Bahadoran,Asghar Ghasemi,Fereidoun Azizi 한국식품영양과학회 2017 Preventive Nutrition and Food Science Vol.22 No.4
This study was conducted to investigate whether regular dietary intake of L-arginine could affect the occurrence of metabolic syndrome (MetS). Eligible adult men and women (n=1,237), who participated in the Tehran Lipid and Glucose Study, were followed for a median of 6.3 years. Dietary intakes of L-arginine and serum nitrate and nitrite (NOx) concentration were assessed at baseline (2006∼2008), and demographics, anthropometrics, and biochemical variables were evaluated at baseline and follow-up examinations. The occurrence of MetS was assessed in relation to total L-arginine, intakes of L-arginine from animal and plant sources, with adjustment of potential confounding variables. Participants who had higher intake of L-arginine also had higher serum NOx at baseline (35.0 vs. 30.5 μmol/L, P<0.05). After 6 years of follow-up, higher intakes of L-arginine from animal sources were accompanied with increased risk of MetS [odd ratios (OR)=1.49, 95% confidence interval (95% CI)=1.02∼2.18]. Compared to the lowest, the highest intakes of L-arginine from plant sources were related to significantly reduced risk of MetS (OR=0.58, 95% CI=0.32∼0.99). In conclusion, our findings suggest a potentially protective effect of plant derived L-arginine intakes against development of MetS and its phenotypes; moreover, higher intakes of L-arginine from animal sources could be a dietary risk factor for development of metabolic disorders.
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Seyed Mohammad Seyed Alizadeh Ganji,Seied Ziaeddin Shafaei,Nasser Goudarzi,Asghar Azizi 한국자원공학회 2016 Geosystem engineering Vol.19 No.1
This study is aimed at determining the optimum mixing ratio and solvent group to extract REEs from nitric leach solution, and the efficiency was tested using three different kinds of extractants, which were prepared to mix three different solvents of Cyanex272, D2EHPA, and HQ. In order to select the best mixture system, different volumes (ml) of solvent extractions were used under optimum conditions (.05 M concentration and pH of 2). The result indicated that the mixture system of Cyanex272 (8 ml) and D2EHPA (2 ml) had the highest separation factor and enrichment ratio in the separation of rare earth element, especially dysprosium. The degree of performance of mixture systems in separation of the rare earth elements indicated that the best extraction systems were in the order of Cyanex272 (8 ml) and D2EHPA (2 ml) > HQ (2 ml) and D2EHPA (8 ml) > Cyanex272 (8 ml) and HQ (2 ml).
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