Abstract
The morphology of calcium sulfate phases precipitated from sea water over the temperature range 125–150°C has been investigated and the effect of chemical additives on morphology is discussed. Effective additives appear to adsorb on nuclei in the liquid to slow crystal growth by displacing SO = 4 and attaching to Ca ++. The effectiveness of PO 3H - and CO 2H suggests that adsorption may involve OH - bonding to calcium ions on the growth face.
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