Synthesis and characterization of high-purity micro-spherical (NH4)2RuCl6 particles using chemical separation combined with spray dried techniques.

(NH 4 ) 2 RuCl 6 is one of the most important precursors for the preparation of Ru powder with high-purity requirement. In this study, high-purity (> 99.999 wt%) micro-spherical (from 2.3 to 10.4 μm) (NH 4 ) 2 RuCl 6 particles with controllable surface were synthesized by chemical separation method combined with spray drying process. After the chemical separation, high-purity (NH 4 ) 2 RuCl 6 precipitation was achieved, while the morphology, size and surface of (NH 4 ) 2 RuCl 6 particles were controlled by the spray drying process. The detailed influencing mechanisms of spray drying process, including gas/liquid rate, drying temperature and solution concentration, were investigated. Both gas/liquid rate and drying temperature influence the morphology and size of spray dried particles, while solution concentration is directly proportional to size of spray dried particles. It should be noted that the powder technology in this study could be applied to synthesize other high-purity spherical particles. [ABSTRACT FROM AUTHOR]