๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

Nucleation and crystal growth of calcium sulfite hemihydrate

โœ Scribed by Gleason, Cynthia L. ;Rochelle, Gary T.

Publisher
American Institute of Chemical Engineers
Year
1991
Tongue
English
Weight
834 KB
Volume
10
Category
Article
ISSN
0278-4491

No coin nor oath required. For personal study only.

โœฆ Synopsis

In slurry scrubbing processes for flue gas desulfurization the precipitation rate of calcium sulfite affects scrubber solution composition, SOz absorption, sulfite oxidation, and limestone utilization. Sludge quality and disposal costs are also a function of precipitation kinetics. The nucleation and crystal growth rates of calcium sulfite hemihydrate were measured in a continuous flow crystallizer at conditions that produced agglomerate crystals. At 28 and 55' C, the nucleation rate, B", varied from 0.25 to 23 x I @ #/m3-sec and was given at p H 5.5 by the correlation:

The suspension density, MT, was varied from 7 to 90 kg/m3. The linear growth rate, G (rn/sec), varied from 0.5 to 9 x 10-m/s as residence time was varied from 42 to 360 minutes. The nucleation rate constant had a maximum near p H 5.5 and was about 50% lower at p H 4.2 and pH 6.5. Gypsum saturation in solution caused both the nucleation and growth rates to decrease.

๐Ÿ“œ SIMILAR VOLUMES

Calcium sulfite hemihydrate: Crystal gro
Calcium sulfite hemihydrate: Crystal growth rate and crystal habit
โœ Tseng, Philip C. ;Rochelle, Gary T. ๐Ÿ“‚ Article ๐Ÿ“… 1986 ๐Ÿ› American Institute of Chemical Engineers ๐ŸŒ English โš– 848 KB

The crystal growth rate of CaS03 \* V2H20 was measured by a pH-stat method in aqueous solution with pH 3.5 to 6.5, 1 to 25 mM dissolved sulfite, 0.01 to 0.3 M Ca", and 0 to 25 mM sulfate. The growth rate was a strong function of relative supersaturation and was strongly inhibited by dissolved sulfat

Kinetics of Nucleation and Crystal Growt
Kinetics of Nucleation and Crystal Growth
โœ R. Lacmann; A. Herden; Ch. Mayer ๐Ÿ“‚ Article ๐Ÿ“… 1999 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 849 KB

This paper deals with homogeneous and heterogeneous primary nucleation and the atomistic model of heterogeneous primary and secondary nucleation. Three aspects of crystal growth mechanisms will be taken into account: growth by two-dimensional nucleation, the so-called birth and spread model, spiral

Cadmium Incorporation in the Crystalliza
Cadmium Incorporation in the Crystallization of Calcium Sulfate Hemihydrate from Phosphoric Acid
โœ T. T. Tjioe; H. Der Van Woude; J. Verbiest; P. F. M. Durville; G. M. van Rosmale ๐Ÿ“‚ Article ๐Ÿ“… 1986 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 691 KB

Semi-batch crystallization experiments of CaSO, -1/2 H,O (HH) wcre performed in concentratcd phosphoric acid at various H,SO, contents in the absence and presence of additives. The influence of the operating conditions and additives on the cadmium and phosphate incorporation in the HH lattice were