Extraction methods Flashcards

1
Q

When is electrolysis used to extract metals

A

metals above carbon in reactivity series

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2
Q

When is heating carbon used to extract metals

A

metals below carbon

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3
Q

What are silver and gold found as

A

uncombined elements

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4
Q

What is the definition of an ore

A

rock contains enough compound to extract a metal for profit

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5
Q

What element are biological extractions mainly used for

A

copper

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6
Q

What are 2 biological ways to extract copper

A

-Bioleaching
-Phytoextraction

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7
Q

describe bioleaching

A

bacteria grow in low grade ore, produces leachate. then displace copper w scrap iron or electrolysis

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8
Q

describe phytoextraction

A

grow plants that absorb metal, burned, extract metal

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9
Q

What are advantages of bioleaching

A

no harmful gases, conserve higher grade ores, no high temps

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10
Q

What are disadvantages og bioleaching

A

very slow, toxic substances which damage enviornment

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11
Q

Advantages of phytoextraction

A

no harmful gases, conserve higher grade ores, can do in contaminated soils

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12
Q

Disadvantages of phytoextraction

A

expensive, depends on weeather

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