Extraction Methods - Bioleaching & Phytomining

Copper is a valuable metal used in various applications. It is mostly found in ores, which can be high or low grade. Due to extensive mining, copper availability is decreasing, necessitating efficient extraction methods. Bioleaching uses bacteria to extract copper, offering energy efficiency but is slow. Phytomining involves plants absorbing copper from soil, which is then extracted by burning the plants. This method is useful for contaminated lands but requires further purification.

What is the main reason for the decreasing availability of copper metal?

• Copper being used in new technologies

• Extensive mining of copper ores

• Copper ores becoming more concentrated

• Increased demand for copper products

Which of the following is a key advantage of bioleaching?

• It produces pure copper directly

• It is a fast process

• It requires no energy

• It is very energy efficient

What role do bacteria play in the bioleaching process?

• They convert copper into a liquid form

• They speed up the extraction process

• They break weak copper sulfur bonds

• They purify copper ores

How do plants contribute to the phytomining process?

• They store copper in their roots

• They convert copper into a gaseous form

• They absorb copper from the soil

• They release copper into the air

What is a disadvantage of the phytomining process?

• It requires a lot of water

• It is harmful to the environment

• The copper produced is not pure

• It is a very slow process