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Microbial Leaching01:27

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Microbial leaching, also known as bioleaching, is an environmentally favorable method for extracting metals from low-grade ores using specific microorganisms. This biotechnological approach is particularly valuable for mining operations targeting copper, gold, and uranium, where traditional extraction methods may be economically or environmentally impractical.Copper Leaching and Microbial CatalysisIn copper bioleaching, crushed ore is arranged into heaps and irrigated with a dilute sulfuric...
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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...
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Solubility equilibria are established when the dissolution and precipitation of a solute species occur at equal rates. These equilibria underlie many natural and technological processes, ranging from tooth decay to water purification. An understanding of the factors affecting compound solubility is, therefore, essential to the effective management of these processes. This section applies previously introduced equilibrium concepts and tools to systems involving dissolution and precipitation.
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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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When a substance such as sodium chloride is added to water, it dissolves, forming an aqueous solution. The extent of dissolution is called solubility. The process of dissolution can exist in equilibrium, just like other chemical processes. Solubility equilibria are also called precipitation equilibria because the process of solubility can be reversible. The reverse of the solubility process is called precipitation.
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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:

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Simultaneous leaching and carbon sequestration in constrained aqueous solutions.

Ji-Won Moon1, Kyu-Seong Cho, James G Moberly

  • 1Biosciences Division, Oak Ridge National Laboratory, TN 37831, USA.

Environmental Geochemistry and Health
|January 20, 2011
PubMed
Summary

Metal-rich fly ash (FA) shows potential for carbon sequestration, with Ca-rich FA capturing significant CO2. However, simultaneous heavy metal immobilization during this process remains a challenge.

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Microbiology

Background:

  • Metal-rich fly ash (FA) is a byproduct with potential applications in carbon sequestration and metal immobilization.
  • Understanding the behavior of metal ions and mineral precipitation in FA is crucial for evaluating its environmental impact.
  • Microbial impacts on these processes are not fully understood, particularly in different aquatic environments.

Purpose of the Study:

  • To investigate metal ion leaching and mineral precipitation in metal-rich fly ash.
  • To evaluate the impact of microbial activity on carbon sequestration and metal immobilization.
  • To compare the behavior of fly ash in different leaching solutions: deionized water (DW) and artificial eutrophic water (AEW).

Main Methods:

  • Analysis of metal-rich fly ash (FA) composition, including Fe- and Ca-rich types.
  • Leaching experiments using aerobic deionized water (DW) and anaerobic, organic- and mineral-rich artificial eutrophic water (AEW).
  • Monitoring of metal ion leaching and precipitated mineral phases over 86 days.

Main Results:

  • Ca-rich FA demonstrated significant carbon sequestration efficiency (up to 32.3 g CO2/kg FA).
  • Fe and Ca leached from FA, while other elements showed increasing or steady trends.
  • Calcite precipitation increased significantly in AEW, but heavy metal immobilization was not achieved simultaneously.

Conclusions:

  • Fly ash properties and leaching solution type influence CO2 capture efficiency.
  • While Ca-rich FA shows promise for carbon sequestration, it does not guarantee simultaneous immobilization of heavy metals.
  • Further research is needed to optimize FA utilization for combined carbon sequestration and metal remediation.