کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10131236 | 1645541 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Improving bio-desilication of a high silica bauxite by two highly effective silica-solubilizing bacteria
ترجمه فارسی عنوان
بهبود زیست سازگاری با بوکسیت سیلیکا بالا توسط دو باکتری بسیار موثر سیلیس-محلول سازی شده
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
چکیده انگلیسی
Bacteria play an important role in bio-desilication of high silica bauxites. However, low bio-desilication efficiency and unknown mechanisms limit the use of bacteria in bio-desilication of bauxite. In this study, two highly effective Si-solubilizing bacteria (Arthrobacter pascens H19 and Burkholderia anthina G21) were obtained and characterized for their impact on Si and Al release from a high-silica (18.1%) bauxite and the mechanisms involved. Dissolved Si and Al concentrations in the culture medium were 3.3-13.9â¯mM and 0.04-0.41â¯mM, and total Si and Al released from the bauxite were 2.76-11.64â¯mg and 0.03-0.39â¯mg, respectively, in the presence of these strains. Strain G21 released more Si from the bauxite than strain H19 at the end of the experiment. These strains produced malic (791-1700â¯ÂµM), citric (94-447â¯ÂµM), and succinic (228-494â¯ÂµM) acids, and expolyssaccharides (EPS) (39-420â¯mgâ¯Lâ1) during the bio-desilication processes. Furthermore, strain G21 produced more organic acids (19-65%) than strain H19, while strain H19 produced more EPS (1.7-4.9-fold) than strain G21. The metabolites (fermentation broth, organic acids, and EPS) of these strains also significantly increased dissolved Si concentration compared to the control. Notably, the ratios of Al2O3 to SiO2 in the bauxite treated with strains H19 and G21 were 9.14 and 9.64, respectively, which met the requirement in the Bayer process for alumina production. The results showed distinct and high bio-desilication effectiveness of these strains and suggested that the highly effective Si-solubilizing bacterial strains increased bio-desilication efficiency through the production of organic acids and EPS.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Minerals Engineering - Volume 128, November 2018, Pages 179-186
Journal: Minerals Engineering - Volume 128, November 2018, Pages 179-186
نویسندگان
Qi Wang, Xia-Fang Sheng, Lin-Yan He, Yu Shan,