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Biological methods for extracting metals

Using resources • Earth's resources and potable water

Key concepts

What you'll likely be quizzed about

  • Bioleaching uses microorganisms, typically bacteria, to oxidize minerals and release metal ions into solution.
  • Bacterial metabolism triggers chemical changes; for example, sulfur-oxidizing bacteria convert sulfide minerals to sulfuric acid, dissolving metal sulfides and liberating metal ions.
  • Bioleaching mobilizes metals without requiring high-temperature processing.
  • The resulting metal-rich solutions undergo further chemical or electrochemical recovery.
  • Key limiting factors include temperature, pH, oxygen supply, presence of toxic compounds, and the growth rate of bacteria.

Flashcards

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What follows biomass harvest in phytomining?

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Incineration of biomass produces metal-rich ash for further chemical or electrochemical recovery.

Key notes

Important points to keep in mind

Bioleaching uses microbes to oxidize minerals; phytomining uses plants to concentrate metals.

Comparing yield, time, cost, energy use, and environmental risk is essential for evaluation.

Microbial kinetics, pH, and oxygen levels critically limit bioleaching effectiveness.

Plant growth rate, metal uptake capacity, and soil characteristics limit phytomining.

Acid production and contaminated leachate pose risks if unmanaged.

Incinerating biomass concentrates metals but generates ash requiring safe handling.

Biological methods are ideal for low-grade ores and remediation instead of fast, high-throughput extraction.

Gathering quantitative data on metal concentrations and costs is crucial for justified evaluations.

Site-specific conditions dictate the preferred biological extraction method.

Effective containment, monitoring, and processing steps are key to environmental safety and overall viability.

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