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The investigations and possibility of leaching or bioleaching from nickel bearing laterite ores
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Abstracts / Current Opinion in Biotechnology 22S (2011) S15–S152
induced by temperature change. They have important applications in drug delivery, on–off valves, separation processes, molecular recovery, etc. Novel temperature-sensitive cellulose graft copolymers were synthesized and characterized by grafting of N,N-diethylacrylamide (DEAM) onto cellulose using cerium(IV) ammonium nitrate (CAN)-HNO3 as initiator system. The effects of reaction time, monomer concentration, initiator/acid ratio on the properties of copolymers were investigated. The copolymers were purified by washing with distilled water, and dried in vacuum (40◦ C). The copolymers were characterized by FTIR, SEM, DSC, and elemental analysis. Temperature sensitivity and response rate of the copolymers were determined by swelling experiments at different temperatures. The amount of DEAM grafted onto cellulose varied with the reaction parameters, and thermosensitivity of the copolymer increased with its DEAM content. doi:10.1016/j.copbio.2011.05.173
D8 The enrichment potential of magnesite by using some Actinomycetes isolated from caves Derya Yanmis 1 , Fikrettin Sahin 2 , Medine Gulluce 1 , Furkan Orhan 1 , Mehmet Karadayi 1 , Tugba Bal 1 , Ozlem Baris 1
D9 The choice between flotation, leaching or bioleaching from low grade copper bearing domestic ores Boris Kiril Krstev 1 , Blagoj Golomeov 1 , Mirjana Golomeova 1 , Aleksandar Boris Krstev 2 1 Goce Delcev University, Faculty of Technical & Natural Science, Macedonia 2 Goce Delcev University, Faculty of Informatics, Macedonia
E-mail address: [email protected] (B.K. Krstev) Aim: Investigations are directed to the new possibilities of treatment as leaching or micro-organisms leaching. Materials & Methods: The choice between flotation, leaching or bioleaching from low grade copper bearing domestic ores. Results: The average recoveries from flotation process in the copper concentrate were ca. 90% for copper, 55–58% for gold, and 35–40% for silver. The average recoveries from leaching were ca. 92–93% for copper, 75–80% for gold, and 70–75% for silver. The average recoveries from bio-leaching were ca. 93–95% for copper, 75–85% for gold, and 75–85% for silver. Discussion: Bioleaching is most appropriate method. doi:10.1016/j.copbio.2011.05.175
1
Department of Biology, Faculty of Science, Ataturk University 25240 Erzurum, Turkey 2 Department of Genetics and Bioengineering, Faculty of Engineering and Architecture, Yeditepe University 34755 Istanbul, Turkey E-mail address: [email protected] (D. Yanmis) Magnesite used in many application fields throughout world posses a critical importance among ore sources of our country. In parallel with raising demand of magnesite, the price of it increases day by day. One of important problems about magnesite ore of our country is that it consists of high level calcium-carbonate. CaCO3 should be under 1% in magnesite content for its being valuable and applicable. Some magnesite ores in Turkey cannot be used, since the amount of CaCO3 is ≥3% and methods for lowering this value are not practical and economic. In this study, we aimed enrichment of magnesite ore with high content CaCO3 by using biotechnological methods. Magnesite enrichment potential of bacterial isolates was determined according to their CaCO3 dissolving abilities. CaCO3 dissolving rates of bacteria, gave positive results in the preliminary studies, were investigated. 2/64 isolates showed significant positive response in the preliminary studies. The isolates showed also positive response in the further investigations performed with magnesite and pure CaCO3 . It is demonstrated that bacterial strains belong to Actinomycetes isolated from some caves have significant magnesite enrichment potential. doi:10.1016/j.copbio.2011.05.174
D10 The investigations and possibility of leaching or bioleaching from nickel bearing laterite ores Boris Kiril Krstev 1 , Blagoj Golomeov 1 , Mirjana Golomeova 1 , Aleksandar Boris Krstev 2 1 Goce Delcev University, Faculty of Technical & Natural Science, Macedonia 2 Goce Delcev University, Faculty of Informatics, Macedonia
E-mail address: [email protected] (B. Golomeov) Aim: Investigations are directed to the new possibilities of treatment as leaching or micro-organisms leaching. Materials & Methods: The investigations and possibility of leaching or bioleaching from nickel bearing laterite ores Results: The average recoveries from segregation-flotationmagnetic separation ca. 75–85% for nickel, from leaching ca. 85–90% for nickel and the average recoveries from bio-leaching with ca. 90–93% for nickel. Discussion: Bioleaching is most appropriate method. doi:10.1016/j.copbio.2011.05.176
D11 Membrane surface modification for protein separation: amphoteric surfaces by plasma polymerization Nursen Zigal, Ebru Akdogan, Mehmet Mutlu Plasma Aided Bioengineering and Biotechnology 3384 (PABB) Research Group, Beytepe Campus, Hacettepe University, Ankara, Turkey E-mail address: [email protected] (N. Zigal) To produce amphoteric membranes via plasma polymerization technique cellulose nitrate and polyethersulfone membrane surfaces are modified with proper precursors at different plasma parameters such as discharge power (5–100 W) and exposure
Abstracts / Current Opinion in Biotechnology 22S (2011) S15–S152
induced by temperature change. They have important applications in drug delivery, on–off valves, separation processes, molecular recovery, etc. Novel temperature-sensitive cellulose graft copolymers were synthesized and characterized by grafting of N,N-diethylacrylamide (DEAM) onto cellulose using cerium(IV) ammonium nitrate (CAN)-HNO3 as initiator system. The effects of reaction time, monomer concentration, initiator/acid ratio on the properties of copolymers were investigated. The copolymers were purified by washing with distilled water, and dried in vacuum (40◦ C). The copolymers were characterized by FTIR, SEM, DSC, and elemental analysis. Temperature sensitivity and response rate of the copolymers were determined by swelling experiments at different temperatures. The amount of DEAM grafted onto cellulose varied with the reaction parameters, and thermosensitivity of the copolymer increased with its DEAM content. doi:10.1016/j.copbio.2011.05.173
D8 The enrichment potential of magnesite by using some Actinomycetes isolated from caves Derya Yanmis 1 , Fikrettin Sahin 2 , Medine Gulluce 1 , Furkan Orhan 1 , Mehmet Karadayi 1 , Tugba Bal 1 , Ozlem Baris 1
D9 The choice between flotation, leaching or bioleaching from low grade copper bearing domestic ores Boris Kiril Krstev 1 , Blagoj Golomeov 1 , Mirjana Golomeova 1 , Aleksandar Boris Krstev 2 1 Goce Delcev University, Faculty of Technical & Natural Science, Macedonia 2 Goce Delcev University, Faculty of Informatics, Macedonia
E-mail address: [email protected] (B.K. Krstev) Aim: Investigations are directed to the new possibilities of treatment as leaching or micro-organisms leaching. Materials & Methods: The choice between flotation, leaching or bioleaching from low grade copper bearing domestic ores. Results: The average recoveries from flotation process in the copper concentrate were ca. 90% for copper, 55–58% for gold, and 35–40% for silver. The average recoveries from leaching were ca. 92–93% for copper, 75–80% for gold, and 70–75% for silver. The average recoveries from bio-leaching were ca. 93–95% for copper, 75–85% for gold, and 75–85% for silver. Discussion: Bioleaching is most appropriate method. doi:10.1016/j.copbio.2011.05.175
1
Department of Biology, Faculty of Science, Ataturk University 25240 Erzurum, Turkey 2 Department of Genetics and Bioengineering, Faculty of Engineering and Architecture, Yeditepe University 34755 Istanbul, Turkey E-mail address: [email protected] (D. Yanmis) Magnesite used in many application fields throughout world posses a critical importance among ore sources of our country. In parallel with raising demand of magnesite, the price of it increases day by day. One of important problems about magnesite ore of our country is that it consists of high level calcium-carbonate. CaCO3 should be under 1% in magnesite content for its being valuable and applicable. Some magnesite ores in Turkey cannot be used, since the amount of CaCO3 is ≥3% and methods for lowering this value are not practical and economic. In this study, we aimed enrichment of magnesite ore with high content CaCO3 by using biotechnological methods. Magnesite enrichment potential of bacterial isolates was determined according to their CaCO3 dissolving abilities. CaCO3 dissolving rates of bacteria, gave positive results in the preliminary studies, were investigated. 2/64 isolates showed significant positive response in the preliminary studies. The isolates showed also positive response in the further investigations performed with magnesite and pure CaCO3 . It is demonstrated that bacterial strains belong to Actinomycetes isolated from some caves have significant magnesite enrichment potential. doi:10.1016/j.copbio.2011.05.174
D10 The investigations and possibility of leaching or bioleaching from nickel bearing laterite ores Boris Kiril Krstev 1 , Blagoj Golomeov 1 , Mirjana Golomeova 1 , Aleksandar Boris Krstev 2 1 Goce Delcev University, Faculty of Technical & Natural Science, Macedonia 2 Goce Delcev University, Faculty of Informatics, Macedonia
E-mail address: [email protected] (B. Golomeov) Aim: Investigations are directed to the new possibilities of treatment as leaching or micro-organisms leaching. Materials & Methods: The investigations and possibility of leaching or bioleaching from nickel bearing laterite ores Results: The average recoveries from segregation-flotationmagnetic separation ca. 75–85% for nickel, from leaching ca. 85–90% for nickel and the average recoveries from bio-leaching with ca. 90–93% for nickel. Discussion: Bioleaching is most appropriate method. doi:10.1016/j.copbio.2011.05.176
D11 Membrane surface modification for protein separation: amphoteric surfaces by plasma polymerization Nursen Zigal, Ebru Akdogan, Mehmet Mutlu Plasma Aided Bioengineering and Biotechnology 3384 (PABB) Research Group, Beytepe Campus, Hacettepe University, Ankara, Turkey E-mail address: [email protected] (N. Zigal) To produce amphoteric membranes via plasma polymerization technique cellulose nitrate and polyethersulfone membrane surfaces are modified with proper precursors at different plasma parameters such as discharge power (5–100 W) and exposure