| 摘要 |
1. Process for making a granulated animal feed phosphate consisting of the phosphates of sodium, magnesium and calcium by introducing phosphoric acid, dolomite and sodium hydroxide solution into an elongated reaction zone, wherein the dolomite consisting of particles with a size of less than 0.1 mm and phosphoric acid are introduced into the head portion of the reaction zone and sodium hydroxide solution is added to said mixture at a point in the reaction zone the mixture of dolomite and phosphoric acid reaches after 0.5-3 minutes, and wherein the dolomite, phosphoric acid and sodium hydroxide solution are passed through the reaction zone with continuous agitation, and reacted, characterized in that a) the phosphoric acid presents a concentration of 50 to 70 weight% P2 O5 and the sodium hydroxide solution presents a concentration of 50 to 80 weight% NaOH, b) the phosphoric acid is introduced into the reaction zone at a temperature of 50 to 120 degrees C and the sodium hydroxide solution is introduced there into at a temperature of 60 to 140 degrees C, c) the sodium hydroxide solution is added to the mixture of dolomite and phosphoric acid along a path of at most 5% the length of the reaction zone, and d) granules with a particle size of 0.5 to 2.5 mm are sieved off. |
