Abstract: Animal feed grade phosphates such as mono-calcium phosphate, di-calcium phosphate or mixtures thereof are produced by direct reaction between phosphoric acid and Ca-containing materials. A finely ground, preheated calcium carbonate suspension is brought to react with a suitable quantity of preheated phosphoric acid by introducing the reactants into a short, tubular reaction zone, open at one end, whereby development of gas and intensive mixing of the reactants in the reaction zone take place. The gas formed by the reaction expels or ejects the foaming reaction mixture from the tube-like reaction zone, the reaction being substantially completed while the individual particles of the mixture are freely suspended in air or gas, whereafter the reacted mixture is collected in the form of a free-flowing granulate having improved handling properties, without any further quenching treatment of the granules.

Abstract: The invention provides an improved pan granulation process for the production of low-water or substantially anhydrous nitrogenous compounds. Hot nitrogenous melt and cooled particulate solids are fed to a rotating pan to form a cresent-shaped bed of rolling or tumbling particles, the thickness or depth of the bed increasing in the direction towards the periphery of the pan and its overflow sector, i.e. position 2 o'clock to position 6 o'clock when the pan surface is regarded as a clock face and the rotation of the pan is counter-clockwise. The cooled solid particles are fed to the pan at a point where the depth of existing material is small, desirably substantially zero, preferably in position 7 to 8 o'clock, if need be by feeding the particles through a tube or the like which extends into the tumbling material on the pan to the proximity of the surface of the pan itself. Subsequently, the cooled particles will then be covered by and with warmer particles tumbling over them.