Table 1 Saturation index (SI) values simulated at the final concentration factor (CF) obtained in MAC tests performed at different temperatures for the synthetic hypersaline solution before (Syn) and after (BT) the basic treatment (numbers in bold are referred to the species that were actually detected in the solid precipitate by PXRD analysis)

Huntite

CaMg₃(CO₃)₄

6.40

–

6.98

–

7.26

–

Gorgeyite

K₂Ca₅(SO₄)₆·H₂O

4.69

–

3.74

–

4.54

–

Dolomite

CaMg(CO₃)₂

3.98

–

4.17

–

4.24

–

Magnesite

MgCO₃

1.91

1.93

1.84

1.86

1.84

1.86

Calcite

CaCO₃

1.15

–

1.20

–

1.19

–

Aragonite

CaCO₃

0.95

–

0.97

–

0.94

–

Anhydrite

CaSO₄

0.26

–

0.33

–

0.56

–

Gypsum

CaSO₄·2H₂O

0.23

–

0.15

–

0.28

–

Halite

NaCl

0.11

0.20

0.08

0.17

0.26

0.37

Sylvite

KCl

−0.37

−0.29

−0.48

−0.40

−0.37

−0.29

Glauberite

Na₂Ca(SO₄)₂

−0.37

–

−0.35

–

0.07

–

Artinite

Mg₂CO₃(OH)₂·3H₂O

−1.04

−1.18

−0.44

−0.59

−0.55

−0.74

Thenardite

Na₂SO₄

–

−1.23

-–

−1.20

–

−0.96

Polyhalite

K₂MgCa₂(SO₄)₄·2H₂O

−1.31

–

−1.70

–

−1.12

–

Epsomite

MgSO₄·7H₂O

–

−1.86

–

−2.07

–

−2.05

Hexahydrite

MgSO₄·6H₂O

–

−1.91

–

−2.02

–

−1.93

Arcanite

K₂SO₄

−2.11

−2.00

−2.25

−2.14

−2.19

−2.07

Pentahydrite

MgSO₄·5H₂O

−2.18

−2.05

−2.32

−2.19

−2.23

−2.08

Kainite

KMgClSO₄·3H₂O

−2.37

−2.14

−2.51

−2.28

−2.23

−1.97

Kieserite

MgSO₄·H₂O

−2.48

−2.29

−2.36

−2.18

−2.06

−1.85

Bloedite

Na₂Mg(SO₄)₂·4H₂O

−2.68

−2.37

−2.85

−2.56

−2.54

−2.21