Development of processes and technologies for obtaining powders and granules of microelements by spray drying and pelletizing on a plate granulator

Abstract

Experimental data on the powders obtaining from solutions of microelements in chelate form on a spray dryer and the regime parameters of its operation are given. The spray dryer design is considered. The technological parameters of the drying process were determined for various combinations of liquid and drying agent consumption. The research results of the structure and granulometric composition of powders are obtained, and the conditions for the preservation of microelements in a complex form are determined. The transition mechanism of a solution drop into a hollow sphere during drying is presented. The process features of obtaining granular microelements in chelated form on mineral carriers are considered. Aqueous solution of copper chelate, mineral carriers (limestone, magnesium hydroxide and phosphate rock) were chosen as subject of research. The plate granulator design is given. It has been established that it is better to carry out granulation in dynamic mode on a plate granulator. The resulting granules have high strength, do not cake, and retain the complex of chelates during long-term storage.