scholarly journals Fluidized Roasting of Low Grade Sulfide Ores

1960 ◽  
Vol 63 (6) ◽  
pp. 912-918
Author(s):  
Kazutoyo Hirose ◽  
Isamu Yano ◽  
Shogo Mikami
Keyword(s):  
Low Grade ◽  
Sulfide Ores

Biomining Microorganisms' Molecular Aspects and Applications in Biotechnology and Bioremediation

2018 ◽  
pp. 1-18
Author(s):  
Jyoti Srivastava ◽  
Pradeep Srivastava
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Low Grade ◽  
Sulfide Ores ◽  
Genomics And Proteomics ◽  
Industrial Operations ◽  
Biotechnological Processes ◽  
Acidic Environments ◽  
Molecular Aspects ◽  
Extraction Of Metals

The effective dissolution of metals is widely known with the help of microorganisms called bioleaching or biomining used for the extraction of metals from their ores. Usually the microorganisms involved in biomining are chemolithoautotrophic and extremophilic in nature, since they are living in highly acidic environments (pH 1-3.0) containing heavy concentrations of metals. The commonly found genera of archea are Sulfolobus, Acidianus, Metallosphaera, and Sulfurisphaera. Throughput microbial genomics and proteomics analysis provides novel insights of metabolism mechanisms of bioleaching microbes. These microbes are having significant impact on the bioremediation of acid mine drainage (AMD) resulted from many industrial operations. Using these microbes, various metals including Ni, Cd, Cu, Fe, As, Pb, Hg, Cr, Mn, Zn, etc. are removed from the environment. Biomining microorganisms are having significant applications in the biotechnological processes including extraction of gold from ores, extraction of nickel from low-grade sulfide ores, extraction of copper from chalcopyrite, etc.

Bioleaching of zinc from low-grade complex sulfide ores in an airlift by isolated Leptospirillum ferrooxidans

2007 ◽  
Vol 89 (1-2) ◽  
pp. 117-126 ◽  
Author(s):  
A. Giaveno ◽  
L. Lavalle ◽  
P. Chiacchiarini ◽  
E. Donati
Keyword(s):  
Low Grade ◽  
Sulfide Ores ◽  
Leptospirillum Ferrooxidans ◽  
Complex Sulfide

Nickel Bioleaching at Elevated pH: Research and Application

2017 ◽  
Vol 262 ◽  
pp. 197-201 ◽  
Author(s):  
Jian Zhi Sun ◽  
Bo Wei Chen ◽  
Jian Kang Wen ◽  
Biao Wu
Keyword(s):  
Nickel Sulfide ◽  
Industrial Applications ◽  
Low Grade ◽  
Sulfide Ores ◽  
Leaching Rate ◽  
Sulfide Deposits ◽  
Acid Consumption ◽  
Sulfide Ore ◽  
The Cost ◽  
Experimental Researches

Biohydrometallurgy has broad application prospect in the treatment of low-grade nickel sulfide ore. However, quite a number of nickel sulfide deposits are associated with basic gangue minerals such as contain olivine, serpentine. The high basic gangue minerals will lead to a higher acid consumption and make it difficult to bioleach at pH below 2.5. It is crucial to improve processes and adapt bacteria with this kind of ore. This paper reviews the experimental researches and industrial applications for bioleaching of the high acid consumption nickel sulfide ores. It is suggested that bioleaching at elevated pH will have similar leaching rate compared with pH below 2.5, meanwhile the cost will be decreased remarkably due to a lower acid consumption and less dissolved impurity ions.

Recovery of silver and zinc by acid pressure oxidative leaching of silver-bearing low-grade complex sulfide ores

2008 ◽  
Vol 89 (1-4) ◽  
pp. 60-64 ◽  
Author(s):  
Liang Duoqiang ◽  
Wang Jikun ◽  
Wang Yunhua ◽  
Jiang Jibo ◽  
Wang Fan
Keyword(s):  
Low Grade ◽  
Sulfide Ores ◽  
Complex Sulfide ◽  
Oxidative Leaching

scholarly journals Processing of Sulfide Copper-Nickel Ores from the Deposits in Murmansk Region by Heap Leaching

Minerals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 820
Author(s):  
Elena Yanishevskya ◽  
Nadezhda Fokina ◽  
Ekaterina Selivanova ◽  
Alena Kompanchenko ◽  
Dmitriy Makarov ◽  
...  
Keyword(s):  
Solid Phase ◽  
Copper Ions ◽  
Low Grade ◽  
Sulfide Ores ◽  
Acidophilic Microorganisms ◽  
X Ray ◽  
Copper Nickel ◽  
Murmansk Region ◽  
Nickel Ores ◽  
Iron Nickel

The feasibility of processing low-grade copper-nickel ores by heap bioleaching was investigated. It was found that an iron-oxidizing strain of acidophilic microorganisms, Acidithiobacillus ferrivorans, is effective in the leaching of sulfide ores from the deposits in Russia’s Murmansk region. Sulfide mineralization of the studied mineral feeds was described using the methods of X-ray phase analysis and optical microscopy. In the process of leaching, the pH and Eh values and the concentrations of ferric and ferrous iron, nickel, and copper ions were monitored. By the end of the experiment, 16.5% of nickel and 7.5% of copper was recovered from the ore of the Allarechensk technogenic deposit, while 22.5% of nickel and 12.7% copper were recovered from the ore of the Nud II deposit. By silicate analysis of the solid phase, patterns of ore chemistry change were described during the process of bioleaching.

Microbial Leaching of Copper from Tailings of Low Grade Sulphide Ores in Zambia

2015 ◽  
Vol 1130 ◽  
pp. 473-476
Author(s):  
Yi Li Liang ◽  
Hua Qun Yin ◽  
Yun Hua Xiao ◽  
Min Tang ◽  
Xue Feng ◽  
...  
Keyword(s):  
Acid Leaching ◽  
Xrd Analysis ◽  
Sulfide Mineral ◽  
Low Grade ◽  
Sulfide Ores ◽  
Sulphide Ores ◽  
The World ◽  
Microbial Leaching ◽  
Sulfur Oxidizing ◽  
Copper Ores

Demand for copper is growing in the world,which makes it increasingly necessary to process low-grade ores and tailings that used to be considered as wastes. The development and application of bioleaching by acidophilic chemolithotrophic microorganisms, which obtain energy from the oxidation of sulfide minerals and use carbon dioxide for constructive metabolism, has been a major approach for processing the low-grade copper ores. In this study, mixed culture consisted of six iron and sulfur oxidizing microorganisms were used in leaching of flotation and acid-leaching tailings obtained from Zambia sulfide ores. The result showed that 62.7% and 61.7% copper were dissolved by bioleaching, while 53.8% and 57.4% by acid leaching in flotation and acid leaching tailings, respectively. In addition, mineralogical forms of copper were quite noteworthy since copper sulfide mineral extraction was significantly improved in bioleaching. XRD analysis showed wollastonite and diopside in acid tailing were undetectable after 23 days while others were difficult to be dissolved. No jarosite or sulphur was detected by XRD in residues.

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