• Bioleaching of copper ore (chalcopyrite) is widely used in many countries. ... This can be done by using the organism Thiobacillus ferrooxidans which can precipitate iron under aerobic conditions.Bioleaching is also useful for the removal of …
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Bioleaching was used to dissolve zinc, phosphorus, potassium and calcium oxide found in iron concentrates using acidophilic microorganisms to enhance the iron yield. Rheological properties of the mineral pulps revealed a maximum in the zero
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Microbially Induced Mineral Beneficiation. K.A. Natarajan, in Biotechnology of Metals, 2018 Abstract. As different from bioleaching, the use of microorganisms in mineral beneficiation is illustrated with examples from iron ore, bauxite, clay, and sulfide mineral beneficiation for selective removal of undesirable impurities.
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A typical of the high sulfur iron ore from Inner Mongolia, China, iron grade of 53.06% and sulfur content is 2.76%, the main metal mineral in the ore is magnetite, followed by magnetic pyrite ...
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This chapter discusses the potential exploitation of microorganisms and their metabolites for the bioleaching of phosphorus from iron ore and as bioreagents for the …
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A novel isolated strain Acidithiobacillus ferrooxidans BMSNITK17 has been investigated for its bioleaching potential from lateritic soil and the results are presented. System conditions like pH, feed mineral particle size, pulp density, temperature, rotor speed influences bioleaching potential of Acidithiobcillus ferrooxidans BMSNITK17 in leaching out iron from …
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Below are a few approaches to bioleaching: Direct v. Indirect Bioleaching. Direct bioleaching uses minerals that are easily receptive to oxidation to create a direct enzymatic strike using the microorganisms to separate the metal and the ore. In indirect bioleaching, microorganisms are not in direct contact with minerals during the process.
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Biobeneficiation presents a long-term, environmentally friendly and sustainable alternative to traditional iron ore processing methods. Bioleaching, bioflotation and bioflocculation have proved effective in increasing iron ore content in off-grade iron ores through the activity of …
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Bioleaching of Iron, Copper, Lead, and Zinc from the Sludge Mining Sediment at Different Particle Sizes, pH, and Pulp Density Using Acidithiobacillus ferrooxidans November 2020 Minerals 10(11):1013
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Bioleaching offers a low-input method of extracting valuable metals from sulfide minerals, which works by exploiting the sulfur and iron metabolisms of microorganisms to break down the ore ...
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In the two-stage bioleaching (or indirect bioleaching) the generation of bioleach solutions (acidic ferric iron-based lixiviants) is separated from contact with the ore. The biological oxidation of Fe 2+ and the regeneration of Fe 3+ in sulfuric acid-containing solutions requires the supply of dissolved O 2 and CO 2 for the microbes.
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The bacteria, particularly T. ferrooxidans, do not directly attack the uranium ore but instead assist in the production of ferric iron (Fe³⁺), which acts as an oxidant. The process is optimized at a pH of 1.5-3.5 and a temperature of …
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1. Introduction. Bioleaching is the extraction of metals from ores using the principal components water, air and microorganism [].It is the extraction or mobilization of valuable (target) metal from the ore, can also be defined as a process of recovering metals from low grade ore [2, 3], with regard to solubility, bioleaching can be defined as a process of recovering soluble one …
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When scaling up the bioleaching process in iron ore-packed columns, we found that cell density and air supply are critical process parameters for attaining high sulfur removal across the entire column with minimal iron loss (Figure 3). The feed solution is …
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This review paper explores the potential of bioleaching as a sustainable alternative for recovering metals from solid matrices. With over 12 billion tons of solid waste annually worldwide, bioleaching provides a …
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Bioleaching is considered as environmental-friendly and economic alternative, and the technical feasibility of stirred tank reactor (STR) bioleaching of copper ore concentrates using acidophilic ...
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Iron ore is essential in steel making; however, high-grade ores have diminished, making low-grade ores inevitable. These low-grade iron ores need further beneficiation to upgrade the iron content. Currently, traditional physical and chemical methods are utilized and are not environmentally friendly. Bio-beneficiation techniques have emerged as a sustainable …
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Iron and sulfur are major energy sources for microorganisms in copper ore bioleaching system, and bioleaching process always companied with transformation of Fe&S compounds.
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In the bioleaching process, bacterial cells have been established as being able to convert metals from solid to liquid phase. However, the most important parameters of bioleaching are particle size, pH, and pulp density, …
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Bioleaching and bio-oxidation processes are alternatives to conventional smelting processes, which discharge large amounts of carbon dioxide, sulfur dioxide, and various toxic materials such as arsenic. ... Furthermore, in the second stage, the chemical attack of the ferric iron to sulfide ore can be performed at higher temperatures to enhance ...
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In contrast to heap or tank bioleaching or biooxidation, where sufficient molecular oxygen is supplied for acidophilic ferrous iron and sulfur compound-oxidizing bacteria and archaea via active aeration, the availability of molecular oxygen in subsurface ore bodies is low.
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Although NaCl addition inhibited iron oxidation activity and bioleaching of FeS2, the presence of 0.2M seemed to enhance bacterial attachment of S. thermosulfidooxidans on pyrite surfaces in ...
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The effects of ultrasound on bioleaching efficiency are related to the type of bioleaching process including: one-step bioleaching (the ore/solid waste is added to inoculum at the beginning of inoculation), two-step bioleaching (a high cell count or metabolite concentration is obtained first and then ore/solid waste is added), and spent medium ...
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This is in conformity with Chime et al., (2011) who reported that iron ore bioleaching follows the normal bacteria growth kinetics. Metals and their compound interact with microbes in various ways depending on the type of metal, organism and …
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shown are bioleaching, iron, heavy metals, Acidithiobacillus. ferrooxidans, bacteria, extraction, and copper and are thus ... on ore samples of Brazilian nickel iron ore using a Bacillus. subtilis ...
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The bioleaching medium consists of a colloidal suspension, where in the continuous phase contains the necessary nutrients for the survival of microorganisms while the discontinuous phase is composed of rigid solid particles of variable shape and size, besides the bacteria (Tributsch, 2000).The rheological properties of mineral pulps change with the bioleaching …
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The success of commercial bioleaching operations and the deeply researched area of bioflotation reagents for sulfide ores inspired research into the applicability of bioleaching and bioflotation for oxide ores (Selim and Rostom, 2018; Kim et al., 2017), particularly iron ore as high-grade reserves become scarce.It is estimated that in 20–40 years, the world's high quality iron …
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For instance thousand tons of uranium ore must be handled in other than bioleaching processes, to obtain one ton of uranium. This is an indirect leaching process since the microbial attack is not on uranium ore directly but on the Iron oxidant. Ferric sulphate and sulfuric acid can be produced by T.ferrooxidans from the pyrite within the ...
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Iron ore tailings (IOTs), specifically those generated from iron ore beneficiation plants, present notable challenges to both the environment and economic sustainability. ... Bioleaching is generally divided into two processes: bioleaching, where the target metals (e.g., copper, nickel, and zinc) are dissolved due to mineral dissolution, ...
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After 6 days of bioleaching process, no abrupt change was observed in redox potential. FTIR analysis Further, the effect of bioleaching on ore body in the presence of indigenous iron-oxidizing bacterial consortia utilizing very sensitive instrumental analysis for the assessment of spectral patterns using FTIR is shown in Fig. 4.
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Iron ore mining represents the topmost metal extraction activity worldwide, only comparable to the crude petroleum extractive industry. According to the British Geological …
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Particle size of the ore is very important for the rate of oxidation of bacteria. The rate decreases with enhancement in size of the ore and vice versa. 13.8.3 Mineral Composition. Rate of bioleaching is also affected by the composition of ore such as concentration of sulfides, amount of mineral present, and the extent of contamination. 13.8.4 pH
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