Biological Methods of Extracting Metals: Pros and Cons

The video discusses traditional and biological methods of metal extraction. Traditional methods involve chemical reactions or electrolysis, while biological methods use plants and bacteria to extract metals from low-grade ores. Bioleaching uses bacteria to form copper ions in a solution, while phytoextraction involves growing plants that absorb metals. Biological methods are environmentally friendly but slower and less profitable than conventional techniques. As high-grade ores deplete, biological methods may become more viable.

What is a common method used to extract metals that are less reactive than carbon?

• Biological methods

• Heating with carbon

• Using acids

• Electrolysis

Which of the following is a key advantage of bioleaching?

• It is suitable for high-grade ores

• It has a high extraction yield

• It is faster than conventional methods

• It produces no waste

What is the main disadvantage of bioleaching?

• It is only applicable to gold

• It is very expensive

• It requires high temperatures

• It produces a highly acidic leachate

How does phytoextraction help in cleaning contaminated soils?

• By using bacteria to break down metals

• By growing plants that absorb metals

• By applying heat to the soil

• By using chemical solvents

What is a limitation of phytoextraction?

• It is more profitable than conventional methods

• It can only be used in tropical climates

• It is less profitable for high-grade ores

• It requires a lot of water

Why might biological methods become more relevant in the future?

• They are faster than conventional methods

• They are more profitable for high-grade ores

• Conventional methods will become less profitable as ore grades decline

• They require less technology

What is a major environmental benefit of using biological methods over conventional mining?

• They are more energy-intensive

• They use lower-grade ores, reducing environmental disruption

• They require more land

• They produce more sulfur dioxide