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Sulfate Separation by Selective Crystallization with a Bis-iminoguanidinium Ligand
Published on: September 8, 2016
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Effect of Solution Stoichiometry on BaSO4 Crystallization from Turbidity Measurements and Modeling
V F D Peters1, A Baken2,3, S Y M H Seepma1
1Department of Earth Sciences, Utrecht University, Princetonlaan 8A, 3584 CB Utrecht, The Netherlands.
Industrial & Engineering Chemistry Research
|January 15, 2024
Summary
Solution stoichiometry significantly impacts barium sulfate (BaSO4) crystallization. Excess ions inhibit nucleation and growth, but a small excess of Ba2+ enhances growth, influencing crystallization models.
Area of Science:
- Geochemistry
- Materials Science
- Chemical Engineering
Background:
- Barium sulfate (BaSO4) precipitation is crucial in various industrial and environmental processes.
- Understanding the factors controlling BaSO4 nucleation and growth is essential for process optimization and scale control.
Purpose of the Study:
- To investigate the influence of solution stoichiometry on barium sulfate (BaSO4) nucleation and growth kinetics.
- To develop a semiempirical model capturing the relationship between ion concentrations, supersaturation, and crystallization rates.
Main Methods:
- Solution transmittance measurements were employed to monitor BaSO4 crystallization.
- Crystallization modeling was used to fit the transmittance data and determine nucleation and growth parameters.
- The study systematically varied the concentrations of Ba2+ and SO42- ions.
Main Results:
- A large excess of either Ba2+ or SO42- ions was found to inhibit both nucleation and growth of BaSO4.
- A small excess of Ba2+ ions demonstrated an enhancement in the growth rate of BaSO4.
- A semiempirical rate model successfully described the observed dependencies of nucleation and growth on supersaturation and stoichiometry.
Conclusions:
- Solution stoichiometry is a critical parameter that must be considered in studies of BaSO4 crystallization.
- The findings suggest that similar investigations into other mineral crystallization processes could yield valuable insights.
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