Bioleaching of low-grade copper sulfide ores by Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans

2014 ◽  
Vol 21 (2) ◽  
pp. 728-734 ◽  
Author(s):  
Jun Wang ◽  
Shan Zhu ◽  
Yan-sheng Zhang ◽  
Hong-bo Zhao ◽  
Ming-hao Hu ◽  
...  
Keyword(s):  
Acidithiobacillus Ferrooxidans ◽  
Copper Sulfide ◽  
Low Grade ◽  
Acidithiobacillus Thiooxidans ◽  
Sulfide Ores

Effect of Bio-Leaching Process on the Pore Structure of Packed Particle Bed via 3D Imaging and Analysis

2013 ◽  
Vol 825 ◽  
pp. 344-347 ◽  
Author(s):  
Ai Xiang Wu ◽  
Bao Hua Yang ◽  
Jin Zhi Liu ◽  
Xiu Xiu Miao
Keyword(s):  
Pore Structure ◽  
Copper Sulfide ◽  
3D Imaging ◽  
Heap Leaching ◽  
Low Grade ◽  
Sulfide Ores ◽  
Ct Scanner ◽  
Packed Particle ◽  
Leaching Process ◽  
Particle Beds

Heap bio-leaching technology is extensively applied to recover metals from low-grade complex ores in the mining industry, particularly the copper sulfide ores. Understanding the effect of bio-leaching process on the pore structure of packed particle beds is important to enhance the percolation and leaching performances with respect to design and operation of heap leaching system. The porosity, pore size distribution and degree of pore connectivity are the three most important features correlated with fluid flow in heap leaching operation. In this study, a spiral X-ray CT scanner, combined with 3D imaging and analysis, was used to characterize the complex pore structure of the packed ore particle beds before and after bioleaching copper sulfide ores. The results indicate that the pore structure has temporal and spatial variations during bio-leaching process.

Analysis of Microbial Community in Heap Bioleaching of Low-Grade Copper Sulfide Ores

2018 ◽  
Vol 777 ◽  
pp. 277-281
Author(s):  
He Shang ◽  
Biao Wu ◽  
Jian Kang Wen ◽  
Xing Lan Cui
Keyword(s):  
Microbial Community ◽  
Acidithiobacillus Ferrooxidans ◽  
Copper Sulfide ◽  
Heterotrophic Bacteria ◽  
Low Grade ◽  
Sequencing Technology ◽  
Leptospirillum Ferriphilum ◽  
Acidithiobacillus Caldus ◽  
Sulfobacillus Thermosulfidooxidans ◽  
Number Of Microorganisms

High-throughput sequencing technology also known as "next generation" sequencing technology, compared with the traditional sequencing method has the characteristics of fast speed, high flux, low cost. In recent years the technology in the detection of microbial diversity has been fully applied. In this study, the microbial community of ore heap in different area and different depth was studied by using this method. The results showed the bio - heap leaching of low - grade secondary copper sulfide ore in Zijinshan from China could effectively recover the copper in the ore. The number of microorganisms in the center was significantly larger than that on the edge of ore heap, and as the depth increases in the heap, the number of microorganisms decreases. The dominant bacteria in the ore heap center was Acidithiobacillus ferrooxidans, in addition there were also some Sulfobacillus thermosulfidooxidans, Ferroplasma cupricumulans, Acidithiobacillus caldus and a small amount of Leptospirillum ferriphilum in the center of the ore heap. Unlike the ore heap center, Sulfobacillus thermosulfidooxidans was the main species on the edge of the ore heap, moreover Acidithiobacillus ferrooxidans, Ferroplasma cupricumulans, Acidithiobacillus caldus and a small amount of Leptospirillum ferriphilum were found on the edge of the ore heap. In addition, some heterotrophic bacteria such as Pseudomonas, Serratia, Sediminibacterium, Stenotrophomonas, Brevundimonas and Variovorax were found both in the center and the edge of the sample, these heterotrophic bacteria may be beneficial for the leaching of valuable metals.

The Impact of Heap Self-Heating on Microbial Activity during the Bioleaching of Low-Grade Copper Sulfide Ores

2017 ◽  
Vol 262 ◽  
pp. 233-236 ◽  
Author(s):  
Denis W. Shiers ◽  
David M. Collinson ◽  
Helen R. Watling
Keyword(s):  
Biological Activity ◽  
Copper Sulfide ◽  
Temperature Increase ◽  
Low Grade ◽  
Sulfide Ores ◽  
Moderately Thermophilic ◽  
Cell Numbers ◽  
Self Heating ◽  
Rapid Temperature ◽  
The Impact

In this study, a dynamically-controlled column was used to evaluate two ores known to cause heap overheating. This enabled the simulation of heap self-heating under controlled conditions. The lixiviant was inoculated with a consortia of mesophilic and moderately thermophilic microorgaisms, and the impact of rapid temperature increases on biological activity and cell numbers was evaluated. During the leaching of ore sample A, the temperature lagged for 29 days before increasing rapidly from 26 to 88 °C. Cell numbers and solution potential increased concomitantly, before both were reduced as the temperature increased past maximum microbial tolerances. Cell numbers began increasing again within 10 days of reaching temperatures that would facilitate mesophilic growth being restored. During the leaching of ore B, the temperature lagged for 4 days before exhibiting a rapid increase in temperature, increasing from 30 to 76 °C over a six-day period. Cell numbers were reduced with the sudden temperature increase, and did not recover over the remainder of the experiment.

Bioleaching of Phosphorus from Low Grade Ores and Concentrates with Acidophilic Iron- and Sulphur-Oxidizing Bacteria

2013 ◽  
Vol 825 ◽  
pp. 266-269 ◽  
Author(s):  
Tuija H. Sarlin ◽  
Outi K. Priha ◽  
Mona E. Arnold ◽  
Päivi Kinnunen
Keyword(s):  
Energy Source ◽  
Acidithiobacillus Ferrooxidans ◽  
Elemental Sulphur ◽  
Phosphorus Leaching ◽  
Low Grade ◽  
Sulphide Minerals ◽  
Bacterial Cultures ◽  
Acid Generation ◽  
Phosphorus Extraction ◽  
Shake Flasks

Bioleaching experiments of phosphorus from low grade fluorapatite ore containing 8.2% P2O5 and from fluorapatite concentrate containing 29.8% P2O5 were carried out in shake flasks. Elemental sulphur was supplemented as an energy source for acid generation. Mixed and pure acidophilic bacterial cultures consisting of iron-and/or sulphur-oxidizing bacteria Acidithiobacillus ferrooxidans, A. thiooxidans and Leptospirillum ferrooxidans were used in the experiments. These acidophiles are commonly used in bioleaching of sulphide minerals, but their application on phosphorus bioleaching has been limited. Phosphorus leaching was shown to be a pH-dependant phenomenon. Phosphorus leaching yields of up to 97% and 28% were obtained in 3 weeks for low grade fluorapatite ore and concentrate, respectively. These results indicate a potential for applying bioleaching for phosphorus extraction from low grade materials.

scholarly journals Efecto de la cisteína en un proceso de biodepiritización de carbones en lecho empacado

2016 ◽  
Vol 18 (1) ◽  
Author(s):  
Gerardo Andrés Caicedo Pineda ◽  
Marco Antonio Márquez Godoy
Keyword(s):  
Acidithiobacillus Ferrooxidans ◽  
Acidithiobacillus Thiooxidans

<p>Se llevaron a cabo procesos de biodesulfurización de dos carbones colombianos ricos en azufre (“Mina Vieja” y “Vampiro”), en reactores de lecho empacado a nivel de erlenmeyer, utilizando un consorcio de Acidithiobacillus ferrooxidans (ATCC 23270) y Acidithiobacillus thiooxidans (ATCC 15494), evaluando la adición de cisteína a la solución lixiviante. Los ensayos fueron monitoreados por medidas de hierro en solución, pH y potencial redox. Adicionalmente, se hicieron análisis mineralógicos por difracción de rayos X (DRX) antes y después de los experimentos. Los ensayos sin adición de cisteína alcanzaron una oxidación de pirita de 45.3% y 57.9% para “Mina Vieja” y “Vampiro” respectivamente. Cuando se adicionó cisteína, la oxidación aumentó en 14.9% para “Mina Vieja” y 6.4% para “Vampiro”. Por otra parte, todos los ensayos evidenciaron remoción de caolinita, debido a su interacción con el ácido sulfúrico del medio. Con base en los resultados obtenidos, los componentes del carbón influenciaron tanto crecimiento bacteriano como la eficiencia de la cisteína sobre el grado de pirita oxidada.</p>

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