In:
Acta Geologica Sinica - English Edition, Wiley, Vol. 87, No. 6 ( 2013-12), p. 1668-1673
Abstract:
According to the compositions of the underground gasfield brines in the west of Sichuan Basin, the phase equilibria in the ternary systems KBr–K 2 B 4 O 7 –H 2 O and KCl–K 2 B 4 O 7 –H 2 O at 373 K were studied using the isothermal dissolution equilibrium method. The solubilities of salts and the densities of saturated solutions in these ternary systems were determined. Using the experimental data, phase diagrams and density‐composition diagrams were constructed. The two phase diagrams were simple co‐saturation type, each having an invariant point, two univariant curves and two crystallization regions. The equilibrium solid phases in the ternary system KBr–K 2 B 4 O 7 –H 2 O are potassium bromide (KBr) and potassium tetraborate tetrahydrate (K 2 B 4 O 7 ·4H 2 O), and those in the ternary system KCl–K 2 B 4 O 7 –H 2 O are potassium chloride (KCl) and potassium tetraborate tetrahydrate (K 2 B 4 O 7 ·4H 2 O). Comparisons of the phase diagrams of the two systems at different temperatures show that there is no change in the crystallization phases, but there are changes in the size of the crystallization regions. As temperature increases, the solubility of K 2 B 4 O 7 ·4H 2 O increases rapidly, so the crystallization field of K 2 B 4 O 7 ·4H 2 O becomes smaller.
Type of Medium:
Online Resource
ISSN:
1000-9515
,
1755-6724
DOI:
10.1111/acgs.2013.87.issue-6
DOI:
10.1111/1755-6724.12167
Language:
English
Publisher:
Wiley
Publication Date:
2013
detail.hit.zdb_id:
2420386-5
SSG:
6,25
