Phytomining and bioleaching

What method uses bacteria to help extract copper from low-grade copper ores?

• Phytomining

• Bioleaching

• Electrolysis

• Reduction by carbon

What type of plants does phytomining depend on?

• Plants that can detoxify copper ions

• Plants that can release copper ions into soil

• Plants that can make copper ions during photosynthesis

• Plants that can absorb copper ions from soil

Which of these do bioleaching and phytomining have in common?

• Slow process

• Done by bacteria

• Done by plants

• Involves burning

What is an advantage of phytomining?

• Costly

• Slow process

• Conserves limited supplies of high-grade ores

• Increases amount of waste rock that must be disposed of after traditional mining

In bioleaching, bacteria are mixed with the ___________ ore. They carry out chemical reactions to produce a solution called ________

What two methods can be used to extract copper from a solution of copper sulfate produced by bioleaching or phytomining?

• Neutralisation or displacement

• Electrolysis or displacement

• Neutralisation or reduction by carbon

• Electrolysis or thermal decomposition

Which type of copper ore contains a low percentage of copper?

• Copper-rich ore

• Low-grade copper ore

Which of the following is not an advantage of bioleaching and phytomining over the traditional methods of extracting copper from high-grade ores?

• Does not require mining

• Removes toxic copper from soil

• More energy efficient

• Very fast methods

Which acid is the ash mixed with in phytomining to form a solution?

• Nitric acid

• Hydrochloric acid

• Sulphuric acid

• Acetic acid

'involves combustion and displacement reactions are involved' - this statement is about phytomining or bioleaching?

• phytomining

• bioleaching