Abstract
Studies were carried out on the anti-caking mechanism of sodium chloride through the use of anti-caking agents which had been proved to beeffectual even in small amount in the previous report. The results obtained were as follows:
(1) It was found out that the effect of inhibiting the growth of crystal by such agents as complexes and heavy metals was good and satisfactory. It was considered, therefore, that the anti-caking effects, were dueto the effect of inhibition of crystal growth of thesalt by these agents adsorbed on the crystals when the salt was being dried, and were also due to the effect of prevention of bridging to be made between the salt particles by the agents.
(2) The existence of a correlation was observed between the effect of inhibition of crystal growth and the effect of anti-caking in the case of ferric ammonium citrate used as an anti-caking agent.
(3) The adsorptive mechanism of potassium ferrocyanide was discussed by using the lattice distance of crystals and the ionic charge of the anti-caking agent.
(4) As the results of determination of adsorbed amounts of potassium ferrocyanide and ferric ammonium citrate, it was found that both of these agents were adsorbed in the higher concentration than that calculated from the lattice vacancies, and that, in the process of adsorption, theseagents entered into the lattice of crystals, because of those characteristics of the structure and the large ionic charges.
(5) For anti-caking of salt by using ferric ammonium citrate, the addition of 5-10 ppm was most suitable.
