Atomistry » Phosphorus » Phosphatic Fertilisers » Potassium Phosphates
Atomistry »
  Phosphorus »
    Phosphatic Fertilisers »
      Potassium Phosphates »

Potassium Phosphates

Basic or neutral phosphates (Rhenania phosphates) may be made directly from rock phosphate by mixing it with potassium chloride, some form of carbon and soda, and heating to over 1000° C. in an electric furnace. One of these products has the composition Ca2KNaP2O8, with some silica. Such products may contain 23 to 31 per cent, of soluble phosphoric acid. Potassium superphosphate has been made by mixing potassium sulphate and calcium carbonate with concentrated phosphoric acid in a lead-lined vessel. The CaSO4.2H2O is separated and the filter-pressed solution is evaporated to dryness by steam heat. The residue may be treated with more phosphoric acid and again evaporated. The reaction is expressed by the equation

K2SO4 + 2H3PO4 + CaCO3 = 2KH2PO4 + CaSO4 + CO2 + H2O

Last articles

Zn in 7VD8
Zn in 7V1R
Zn in 7V1Q
Zn in 7VPF
Zn in 7T85
Zn in 7T5F
Zn in 7NF9
Zn in 7M4M
Zn in 7M4O
Zn in 7M4N
© Copyright 2008-2020 by atomistry.com
Home   |    Site Map   |    Copyright   |    Contact us   |    Privacy