C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
99/31, 23/69
C01B 25/32 (2006.01) A23K 1/175 (2006.01) B01J 19/24 (2006.01)
Patent
CA 1060631
Abstract of the Disclosure The invention provides a method of producing animal feed grade phosphates such as mono-calcium phosphate, di-calcium phosphate or mixtures of same by direct reaction between phosphoric acid and Ca-containing material, in which a finely ground, preheated calcium carbonate suspension is brought to react with a suitable quantity of preheated phos- phoric 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 expelling or ejecting the foaming reaction mixture from the tube-like reaction zone, the reaction being substantially completed while the individual particles of the reacted mixture are freely suspended in air or gas, whereafter the reacted mixture is collected in the form of a free-flowing granulate having improved hand- ling properties. The invention also provides an apparatus for carrying out the process comprising a reaction chamber connected with separate feed lines for calcium carbonate suspension and phosphoric acid, respectively, and means for collecting and further processing the resultant reaction product in which the reaction chamber has the form of a tube reactor having an open end portion which forms a discharge means, which means is arranged for cooperation with a suspension chamber and a collecting device arranged at the lower end of the chamber.
222335
Isaksen Jan B.
Skauli Oyvind
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