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The Structure and Interactions of Species in Supersaturated Caustic Aluminate Solutions
Author(s) -
AddaiMensah Jonas,
Li Jun,
Prestidge Clive A.
Publication year - 2002
Publication title -
developments in chemical engineering and mineral processing
Language(s) - English
Resource type - Journals
eISSN - 1932-2143
pISSN - 0969-1855
DOI - 10.1002/apj.5500100608
Subject(s) - sodium aluminate , chemistry , supersaturation , aluminate , sodium , potassium , inorganic chemistry , molar mass , viscosity , solvent , ion , ionic strength , deuterium , hydrogen , organic chemistry , thermodynamics , materials science , aqueous solution , aluminium , cement , metallurgy , polymer , physics , quantum mechanics
The influence of akali metal ions (Na + and K + ), hydrogen isotope (H and D) and temperature on apparent hydrodynamic molar volumes, structure and interactions of species in synthetic, supersaturated caustic aluminate solutions (Bayer liquors) has been investigated. A strong dependency of structure, size and species interactions (ion‐ion and ion‐solvent) on the three primary variables was revealed. Sodium and deuterium‐based liquors displayed higher viscosities, reflected in greater attractive interactions, higher activation energies and entropies of viscous flow, than potassium and hydrogen‐based liquors. The apparent, hydrodynamic molar volumes of the viscosity modifying species were larger in sodium and hydrogenated than in potassium and deuterated aluminate liquors, and decreased with increasing temperature. Ionic strength‐independent average molar mass of Al(III)‐containing species close to 100 g mol 1 and corresponding to monomeric, tetrahydroxo aluminate (Al(OH) 4 − ) species was observed.