Consulta: subjectFacets:"Bioleaching"
Registros recuperados: 5
Data/hora: 13/06/2024 21:55:49

Use of Aspergillus niger in the bioleaching of colemanite for the production of boric acid
Provedor de dados: 69
Autores: Bayat,Oktay; Arslan,Volkan; Bayat,Belgin.
Colemanite is one of the most important underground riches of Turkey, having approximately 60% of the world boron deposits, and it has a large portion in the deposits. In this study, chemical leaching and biological leaching methods were used for production of boric acid from colemanite (2CaO Â· 3B3O3 Â· 5H2O) (Emet-KÃ¼tahya, Turkey). Oxalic acid concentration, temperature, stirring time and solid-to-liquid ratio were taken as parameters in the chemical leaching process. It was found that the dissolution rate increases with increasing oxalic acid concentration and temperature but it decreases at higher solid-to-liquid ratios in the chemical leaching process. Using optimum conditions (d100 = 0.075 mm; 5% solids by weight; 0.55 M oxalic acid; 80 Â± 2ÂºC...
Tipo: Journal article
Palavras-chave: Aspergillus niger; Bioleaching; Boric acid; Chemical leaching; Colemanite; Oxalic acid.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000300007

Properties of realgar bioleaching using an extremely acidophilic bacterium and its antitumor mechanism as an anticancer agent
Provedor de dados: 48
Autores: Chen,Peng; Xu,Ruixiang; Yan,Lei; Wu,Zhengrong; Wei,Yan; Zhao,Wenbin; Wang,Xin; Xie,Qinjian; Li,Hongyu.
Abstract Realgar is a naturally occurring arsenic sulfide (or Xionghuang, in Chinese). It contains over 90% tetra-arsenic tetrasulfide (As4S4). Currently, realgar has been confirmed the antitumor activities, both in vitro and in vivo, of realgar extracted using Acidithiobacillus ferrooxidans (A. ferrooxidans). Bioleaching, a new technology to greatly improve the use rate of arsenic extraction from realgar using bacteria, is a novel methodology that addressed a limitation of the traditional method for realgar preparation. The present systematic review reports on the research progress in realgar bioleaching and its antitumor mechanism as an anticancer agent. A total of 93 research articles that report on the biological activity of extracts from realgar using...
Tipo: Journal article
Palavras-chave: A. ferrooxidans; Anticancer effect; Bioleaching; RBS; Realgar.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602017000100502

A novel acidophilic, thermophilic iron and sulfur-oxidizing archaeon isolated from a hot spring of tengchong, yunnan, China
Provedor de dados: 58
Autores: Ding,Jiannan; Zhang,Ruiyong; Yu,Yizun; Jin,Decai; Liang,Changli; Yi,Yang; Zhu,Wei; Xia,Jinlan.
A novel thermoacidophilic iron and sulfur-oxidizing archaeon, strain YN25, was isolated from an in situ enriched acid hot spring sample collected in Yunnan, China. Cells were irregular cocci, about 0.9-1.02 µm×1.0-1.31 µm in the medium containing elemental sulfur and 1.5-2.22 µm×1.8-2.54 µm in ferrous sulfate medium. The ranges of growth and pH were 50-85 (optimum 65) and pH 1.0-6.0 (optimum 1.5-2.5). The acidophile was able to grow heterotrophically on several organic substrates, including various monosaccharides, alcohols and amino acids, though the growth on single substrate required yeast extract as growth factor. Growth occurred under aerobic conditions or via anaerobic respiration using elemental sulfur as terminal electron acceptor. Results of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Isolation; Identification; Acidianus manzaensis; Bioleaching.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000200016

Bacterial consortium for copper extraction from sulphide ore consisting mainly of chalcopyrite
Provedor de dados: 58
Autores: Romo,E.; Weinacker,D.F.; Zepeda,A.B.; Figueroa,C.A.; Chavez-Crooker,P.; Farias,J.G.
The mining industry is looking forward for bacterial consortia for economic extraction of copper from low-grade ores. The main objective was to determine an optimal bacterial consortium from several bacterial strains to obtain copper from the leach of chalcopyrite. The major native bacterial species involved in the bioleaching of sulphide ore (Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans, Leptospirillum ferrooxidans and Leptospirillum ferriphilum) were isolated and the assays were performed with individual bacteria and in combination with At. thiooxidans. In conclusion, it was found that the consortium integrated by At. ferrooxidans and At. thiooxidans removed 70% of copper in 35 days from the selected ore, showing significant differences...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioleaching; Acidithiobacillus ferrooxidans; Acidithiobacillus thiooxidans.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822013000200032

Bioleaching of gold, copper and nickel from waste cellular phone PCBs and computer goldfinger motherboards by two Aspergillus nigerstrains
Provedor de dados: 58
Autores: Madrigal-Arias,Jorge Enrique; Argumedo-Delira,Rosalba; Alarcón,Alejandro; Mendoza-López,Ma. Remedios; García-Barradas,Oscar; Cruz-Sánchez,Jesús Samuel; Ferrera-Cerrato,Ronald; Jiménez-Fernández,Maribel.
In an effort to develop alternate techniques to recover metals from waste electrical and electronic equipment (WEEE), this research evaluated the bioleaching efficiency of gold (Au), copper (Cu) and nickel (Ni) by two strains of Aspergillus niger in the presence of gold-plated finger integrated circuits found in computer motherboards (GFICMs) and cellular phone printed circuit boards (PCBs). These three metals were analyzed for their commercial value and their diverse applications in the industry. Au-bioleaching ranged from 42 to 1% for Aspergillus niger strain MXPE6; with the combination of Aspergillus niger MXPE6 + Aspergillus niger MX7, the Au-bioleaching was 87 and 28% for PCBs and GFICMs, respectively. In contrast, the bioleaching of Cu by Aspergillus...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioleaching; PCBs; Aspergillus; Gold; WEEE.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000300707