Morphology, Mineralogy, and Solid–Liquid Phase Separation Characteristics of Cu and Zn Precipitates Produced with Biogenic Sulfide

2013 ◽  
Vol 48 (1) ◽  
pp. 664-673 ◽  
Author(s):  
D. K. Villa-Gomez ◽  
E. D. van Hullebusch ◽  
R. Maestro ◽  
F. Farges ◽  
S. Nikitenko ◽  
...  
Keyword(s):  
Phase Separation ◽  
Liquid Phase ◽  
Liquid Phase Separation ◽  
Solid Liquid ◽  
Cu And Zn

The Pressure Dependence of the Phase Diagram t-Butanol/Water

1985 ◽  
Vol 40 (7) ◽  
pp. 693-698 ◽  
Author(s):  
M. Woznyj ◽  
H.-D. Lüdemann
Keyword(s):  
Phase Diagram ◽  
Phase Separation ◽  
Liquid Phase ◽  
Pressure Dependence ◽  
Liquid Phase Separation ◽  
Temperature Range ◽  
Solid Liquid ◽  
Rich Side ◽  
Liquid Liquid Phase Separation

The phase diagram t-butanol/water is studied in the temperature range between 200 and 450 K at pressures up to 200 MPa. No liquid/liquid phase separation is observed in this range. The solid/liquid phase diagram reveals the presence of a stable t-butanol/dihydrate at all pressures. At the t-butanol rich side of the diagram solid mixtures with compositions t-butanol/water ~ 5 :1 and ~ 6 : 1 are observed.

Realistic coagulation mechanisms in the use of aluminium and iron(III) salts

1997 ◽  
Vol 36 (4) ◽  
pp. 103-110 ◽  
Author(s):  
István Licskó
Keyword(s):  
Phase Separation ◽  
Liquid Phase ◽  
Suspended Solids ◽  
Liquid Phase Separation ◽  
Metal Hydroxide ◽  
Water Soluble ◽  
Short Period ◽  
Rapid Hydrolysis ◽  
Solid Liquid ◽  
Hydrolysis Of

The processes leading from coagulant feed to the development of flocs suited to solid-liquid phase separation are examined and analyzed in the light of available information and experimental data. It is concluded that at the relatively high buffering capacity (HCO3− concentration above 1.8 meg/L) and close to neutral pH values (7.0<pH<8.4) typically found in the surface waters of Hungary, flocs suited to solid-liquid phase separation develop from the coagulant added within a very short period of time (10-20 seconds). These flocs are not capable of changing the charge of the particles on the colloidal, quasi-colloidal, or destabilizing the dispersion. Between the hydrolysis of the coagulant and the development of large flocs, “short-lived” water soluble aluminium and iron(III) hydroxide complexes, metal hydroxide sols are formed, which also carry a positive charge. These latter two metal hydroxide types (which also exist for a brief period - a few seconds - only) are the ones capable of destabilizing the dispersion. The bond between the suspended solids to be removed and the metal hydroxide sols and water soluble metal hydroxide complexes must be established within this short period. Rapid mixing of the coagulant will ensure rapid hydrolysis of the coagulant, contact between the sols and the suspended solids and will retard the development of large flocs which are inactive in destabilizing the dispersion.

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