Wet melting

There are inherent complications in partition studies. The presence of at least three components implies many possibilities for interactions. More important is the effect of the mutual solubilities of the two solvent phases. No two solvents are perfectly immiscible, and hence the data always refer to the partition of one component between two binary liquids. The effect of the usually small amount of dissolved solvent can be large. For example, a useful test for distinguishing m/ramolecular and intermolecular H bonding is the determination of the dry and wet melting points. The small amount of water that dissolves in the liquid phase has a pronounced effect on the melting point of intermolecularly H bonded substances. See Section 5.3.4 and Table 5-1V for examples and discussion of this effect. 

Chazot G., Menzies M. A., and Harte B. (1996) Determination of partition coefficients between apatite, clinopyroxene, amphibole and melt in natural spinel Uierzolites from Yemen implications for wet melting of the lithospheric mantle. Geochim. Cosmochim. Acta 60, 423-437. 

Permeability varies over wide ranges even with a single type of product, more than other properties. However, its determination may provide information on the degree and character of sintering of the ware it is closely related to the resistance to wetting melts. 

The steam produced is removed from the molten ammonium nitrate (m.p. 170°C) via the vortex finder of a cyclone separator, and the 99+% molten salt proceeds to either a cooled stainless steel belt to produce a flaked product (Fig. 11.10), or to a 30-m-high prilling tower where droplets of melt fall through a countercurrent dry air stream to produce shot-sized prills (beads) of ammonium nitrate. A hot concentrated solution of ammonium nitrate is explosively sensitized by traces of acid so care is taken to add sufficient ammonia to the wet melt to keep the pH above about 5. 

Fig. 1.19. Viscosity as function of temperature of a dry and water containing soda lime silicate glass [448] dry melted in N2-enriched atmosphere wet melted in H2O vapour enriched atmosphere...

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