[H.sub.2]O), potassium hydrate phosphate ([K.sub.2]HP[O.sub.4]), rankinite
([Ca.sub.3]Si2[O.sub.7]) and sodium formate (HCOONa) (Stanjek and Hausler 2004).
After setting, calcium silicate (rankinite, Ca3Si2O7), tricalcium silicate oxide ([Ca.sub.3](Si[O.sub.4])O; card number: 01-070-1846), calcium hydroxide phosphate (monetite, CaHP[O.sub.4]; card number: 01-070-0359), calcium sulfate (Ca[S.sub.3][O.sub.10]; card number: 00-021-0166), and calcium phosphate (catena Ca(P[O.sub.3])2, card number: 01-079-0700 and Whitelockite [beta]-TCP, [Ca.sub.3][(P[O.sub.4]).sub.2]; card number: 00-055-0898) phases were detected (Figure 2(b)).
In XRD of MTA Angelus, calcium silicate (rankinite, [Ca.sub.3][Si.sub.2][O.sub.7]) and tricalcium silicate oxide ([Ca.sub.3](Si[O.sub.4])O) have been detected.
The recorded spectrograms of analysed samples of slag point to the possibility of calcium ferrite Ca[Fe.sub.2][O.sub.4] (CF) and rankinite
[Ca.sub.3][Si.sub.2][O.sub.7] ([C.sub.3][S.sub.2]) stages as well.
The Ca-silicate composition of the ashes produced at the Eesti TPP, however, includes also C3S ([Ca.sub.3]Si[O.sub.5]) and rankinite ([Ca.sub.3][Si.sub.2][O.sub.7]) type phases.
In the Balti TPP secondary Ca-silicates are represented mainly by [beta]-C2S (belite), merwinite and wollastonite; while in the Eesti TPP also C3S, rankinite, as well as C4AF and akermanite are found.
The associate species for the modeling of the liquid phase include CaSi[O.sub.3] (wollastonite) which is stable between 298 to 1398 K, CaSi[O.sub.3] (pseudowollastonite) which is stable at 1398 to 1817 K, [Ca.sub.2]Si[O.sub.4] (calcium othosilicate), [Ca.sub.3]Si[O.sub.5] which is stable in the temperature range from 1523 to 2343 K and Ca3Si2O7 (rankinite
) which is stable up to 1737 K .