UREA-PRILL ANTI-CAKING PROCESS

摘要

Hot urea prills can be made to resist caking by cooling them quickly under quiescent conditions. To accomplish this, the hot prills are collected in a cooling chamber and a flow of air at a temperature not exceeding about 130 DEG F is directed through the prills so that the prill temperature is quickly reduced. Throughout the cooling step the prills are maintained in a quiescent state so that a glassy surface is maintained on each prill. Such surface helps reduce subsequent caking.