Story: Superphosphate

Superphosphate manufacture

Superphosphate manufacture

The basic ingredients of superphosphate are rock phosphate and sulfuric acid. Sulfuric acid is made by converting elemental sulfur to sulfur trioxide, which, with added water, is dissolved in sulfuric acid to produce more acid. Finely ground rock phosphate and sulfuric acid are mixed in a den to produce superphosphate, which is then granulated and dried. Other nutrients may be added at this stage.

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How to cite this page:

Arthur Duncan, 'Superphosphate - Making superphosphate', Te Ara - the Encyclopedia of New Zealand, (accessed 27 June 2022)

Story by Arthur Duncan, published 24 Nov 2008