Ron Roy on wed 12 nov 97
Can someone out there explain the difference between Tri-Calcium phosphate
and Bi-Calcium phosphate.
I know (and thanks to all those who answered my question about Tri- calcium
phos.) the Tri is a reasonable sub for bone ash - do I assume that Bi has
less calcium in relation to phosphate - are there any other differences?
Anybody have an analysis for the Bi?
Ron Roy
93 Pegasus Trail
Scarborough,Canada
M1G 3N8
Evenings, call 416 439 2621
Fax, 416 438 7849
Studio: 416-752-7862.
Email ronroy@astral.magic.ca
Home page http://digitalfire.com/education/people/ronroy.htm
Tom Buck on thu 13 nov 97
Ron Roy: As I noted in the tricalcium phosphate discussion, nowadays most
of this material comes from reacting phosphoric acid with calcium
hydroxide (lime water, or milk of lime). So does calcium phosphate dibasic
or bi-calcium phosphate as you and others sometimes call it. To make the
dibasic salt (and not the tribasic salt), one alters the proportions of
the two reactants. The essential difference is shown thusly:
dibasic - CaHPO4 (or the duo hydrated form, CaHPO4.2H2O)
tribasic - Ca5OH(PO4)3
The mole weight of dibasic is 136 whereas the mole wt of tribasic is
502.4 and the corresponding PO4 (phosphate) percentage is 70% for dibasic
and 56.7% for tribasic.
When 1 mole of CaHPO4 is fired it yields 1 mole of CaO and 0.5
mole of P2O5
When 1 mole of tribasic is fired it yields 5 moles of CaO and 1.5 moles
of P2O5.
Tom Buck ) tel: 905-389-2339
& snailmail: 373 East 43rd St. Hamilton ON L8T 3E1 Canada
(westend Lake Ontario, province of Ontario, Canada).
On Wed, 12 Nov 1997, Ron Roy wrote:
> ----------------------------Original message----------------------------
> Can someone out there explain the difference between Tri-Calcium phosphate
> and Bi-Calcium phosphate.
>
> I know (and thanks to all those who answered my question about Tri- calcium
> phos.) the Tri is a reasonable sub for bone ash - do I assume that Bi has
> less calcium in relation to phosphate - are there any other differences?
> Anybody have an analysis for the Bi?
>
>
> Ron Roy
> 93 Pegasus Trail
> Scarborough,Canada
> M1G 3N8
> Evenings, call 416 439 2621
> Fax, 416 438 7849
> Studio: 416-752-7862.
> Email ronroy@astral.magic.ca
> Home page http://digitalfire.com/education/people/ronroy.htm
>
Rafael Velasquez Duarte on thu 13 nov 97
Hi Ron Roy
Tricalcium phosphate has a formula Ca3(PO4)2 with 38.76 % of Ca and dicalcium
ortophosphate CaHPO4 with 29.46 % of Ca. Monocalcium phosphate is
CaH4O8P2 or Ca(H2PO4)2.
I think this help you
Rafael Velasquez
Ron Roy wrote:
> ----------------------------Original message----------------------------
> Can someone out there explain the difference between Tri-Calcium phosphate
> and Bi-Calcium phosphate.
>
> I know (and thanks to all those who answered my question about Tri- calcium
> phos.) the Tri is a reasonable sub for bone ash - do I assume that Bi has
> less calcium in relation to phosphate - are there any other differences?
> Anybody have an analysis for the Bi?
>
> Ron Roy
> 93 Pegasus Trail
> Scarborough,Canada
> M1G 3N8
> Evenings, call 416 439 2621
> Fax, 416 438 7849
> Studio: 416-752-7862.
> Email ronroy@astral.magic.ca
> Home page http://digitalfire.com/education/people/ronroy.htm
ZALT@aol.com on sat 15 nov 97
Ron;
I don't believe there is anything called Bi-calcium phosphate. I just
checked my Ceramics Industry Materials Handbook, Jan 97 issue and there is
no memntion of a Bi-calcium phosphate.
Terrance
St Hubert, Quebec, Canada!!!!!!!!!!!!!!
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