#### Psychlone

I stumbled across a formula which reads:
3Ca(Po3)2 + 10C

The paper was written in mid 19xx, in the paper it is described how that is a way to "extract" Phosphorus.

This is slightly confusing as there must be a misprint (the "o" should be capital O for Oxygen, if we assume that, does that make the first reactant to be Calcium Phosphite?

#### topsquark

Forum Staff
I stumbled across a formula which reads:
3Ca(Po3)2 + 10C

The paper was written in mid 19xx, in the paper it is described how that is a way to "extract" Phosphorus.

This is slightly confusing as there must be a misprint (the "o" should be capital O for Oxygen, if we assume that, does that make the first reactant to be Calcium Phosphite?

Ca(PO3)2 is called metacalcium phosphate. (It took a while to find it on the internet.) Did you possibly mean Ca3(PO4)2? Calcium phosphate seems to have the formula Ca3(PO4)2 but there is a "mono" and "di" calcium phosphate as well. This one is properly called tricalcium phosphate. To further confuse matters calcium phosphite is Ca3(PO3)2.

I couldn't find anything on extracting phosphorus from metacalcium phosphate. Given the similarity between the two compound nomenclatures is it possible that you are actually talking about calcium phosphate? I couldn't find the specific reaction but there are many articles about extracting phosphorus from calcium phosphate.

-Dan

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#### Maryna22

For initial calcium phosphate can be only 1 formula due to ions charges.
Ca3 (PO4)2.
I found they way to extract P is to react with sand and pure carbon at Hight temp.
I can offer to start equation like that:
Ca3 (PO4)2 + SiO2 + C --> CaSiO3 + CO + P4

Note P is not diatomic.