mining phosphate - NPK fertilisers

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5 Terms

1
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what is the problem with phosphate salts in rocks?

  • insoluble

    • plants can’t use for nutrients

2
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how can soluble phosphates be produced?

reacting phosphate with different acids

3
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phosphate + nitric acid →

phosphoric acid + calcium nitrate

4
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phosphate + sulfuric acid →

  • single superphosphate

    • calcium sulfate

    • calcium phosphate

5
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phosphate + phosphoric acid →

  • triple superphosphate

    • calcium phosphate