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Bioleaching kinetics of copper from copper smelters dust
Fereshteh Bakhtiari,Hossein Atashi,Mortaza Zivdar,Seyedali Seyedbagheri,Mohammad Hassan Fazaelipoor 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.1
The smelting factory of Sarcheshmeh Copper Complex in Iran produces about 50 tons per day of copper dust containing 36% Cu, 22.2% Fe and 12.2% S. The dust is currently recycled to the smelters. Thismethod is not desirable in terms of operation, and energy consumption. A mixed culture of mesophilic bacteria was used to examine the bioleaching of copper from the dust. The effect of various parameters such as pulp density, nutrients, temperature, and the amount of pyrite added to the bioleaching media were examined in the dust bioleaching tests. It was shown that the bacteria contributed effectively in the leaching of copper from the dust. The collected data showed that at pH 1.8 and the pulp density less than 7%, the dissolution of copper followed shrinking core kinetic model and the process was limited by diffusion of lixiviant. With the pulp density of 7%, however, the process showed to be reaction limited.
Zahra Mirghiasi,Fereshteh Bakhtiari,Esmaeel Darezereshki,Esmat Esmaeilzadeh 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.1
CaO is an important material because of its application as catalyst and effective chemisorbents for toxicgases. In this research CaO nanoparticles were prepared via direct thermal decomposition method usingCa(OH)2 as a wet chemically synthesized precursor. Nanocrystalline particles of Ca(OH)2 have beenobtained by adding 1 and 2 M NaOH aqueous solutions to 0.5 M CaCl2ㆍ2H2O aqueous solutions at 80 ℃. The precursor [Ca(OH)2] was calcined in N2 atmosphere at 650 ℃ for 1 h. Samples were characterized byX-ray diffraction (XRD), thermogravimetric analysis (TGA), infrared spectrum (IR), scanning electronmicroscopy (SEM), transmission electron microscopy (TEM) and Brunaure–Emett–Teller (BET). SEMimages showed that CaO nano-particles were nearly spherical in morphology. TEM images illustratedthat produced CaO nano-particles had the mean particle size of 91 and 94 nm for 1 and 2 M NaOHconcentration, respectively. As a result, this method could be used for production of CaO nano-particleson large-scale as a cheap and convenient way, without using any surfactant, organic medium orcomplicated equipment.
Electrodeposition of Cu2O particles on reinforced concrete substrate
Zahra Khadem Modaresi,Fereshteh Bakhtiari,Esmaeel Darezereshki,Seyed Ahmad Ataei 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.24 No.-
Cu2O as an antimicrobial agent was electrodeposited on reinforced concrete with the aim to control microbial corrosion in concrete sewers. Alkalize Cu(II) lactate were used as electrolyte and the concentration of copper sulfate was decreased from 0.6 M to 0.1 M and for lactic acid from 3 M to 0.75 M. The results showed the formation of Cu2O particles on concrete substrate. The investigation of electrodeposition time on the purity of Cu2O was revealed that increasing in the time of electrodeposition and depletion of OH ions close to the substrate caused to co-deposit of Cu or CuO with Cu2O.