Monocalcium phosphate#Fertilizer

As Superphosphate various phosphates used as fertilizers are referred to, which differ in their phosphate content and water-insoluble minor components.

Superphosphate

For the production of superphosphate existing, insoluble calcium phosphate with the aid of sulfuric acid is decomposed in nature:

Thus, water-soluble calcium dihydrogen phosphate is obtained water-insoluble calcium sulfate in addition to about 60%. In this mixture is (converted ) 16-22 wt - include % P2O5.

The process for the manufacture of superphosphate was developed by the British agricultural chemist John Bennet Lawes. In 1843 he began the production of artificial fertilizers.

Double superphosphate

In contrast to the superphosphate falls in the production of double superphosphate at no insoluble calcium sulfate. To this end, insoluble calcium phosphate, associated in nature with calcium carbonate which occurs reacted with phosphoric acid technical:

The resulting double superphosphate contains the equivalent of 35 wt - % P2O5.

Triple superphosphate

As triple superphosphate (also triple superphosphate ) a Calciumdihydrogenphosphathaltiger fertilizer is called, the equivalent of a content of over 46 wt - % P2O5 has. This can be achieved, for example, if, phosphoric acid is used instead of a higher purity of technical grade phosphoric acid, which is used for the production of double superphosphate.