Table 3 Mineral reaction parameters (20 ℃).

From: Numerical simulation of hydrochemical evolution of deep pore thermal reservoirs in shallow groundwater recharge of Yancheng uplift

Reaction

Log_k

∆H(kcal)

CaCO3 = CO3 −2 + Ca+2

8.48

2.297

CaMg(CO3)2 = Ca+2 + Mg + 2 + 2 CO3 −2

17.09

9.436

KAl3Si3O10(OH)2 + 10 H+ = K+ + 3Al+3 + 3H4SiO4

12.99

59.34

Mg5Al2Si3O10(OH)8 + 16 H+ = 5Mg+2 + 2Al+3 + 3H4SiO4 + 6H2O

68.38

151.494

NaAlSi3O8 + 8 H2O = Na + + Al(OH)4− + 3 H4SiO4

18.002

25.896

Al2Si2O5(OH)4 + 6 H+ = H2O + 2 H4SiO4 + 2 Al+3

7.435

35.300

K0.6Mg0.25Al2.3Si3.5O10(OH)2 + 11.2H2O = 0.6 K+ + 0.25Mg+2 + 2.3Al(OH)4- + 3.5H4SiO4 + 1.2 H+

40.267

54.684

SiO2 + 2 H2O = H4SiO4

3.98

5.990

KAlSi3O8 + 8 H2O = K+ + Al(OH)4− + 3 H4SiO4

20.573

30.820

Back to article page