Method for producing calcium phosphates
    2.
    发明授权
    Method for producing calcium phosphates 失效
    磷酸钙生产方法

    公开(公告)号:US4166839A

    公开(公告)日:1979-09-04

    申请号:US816869

    申请日:1977-07-18

    摘要: 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. An apparatus for carrying out the process includes 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. The reaction chamber has the form of a tube reactor having an open end portion which forms a discharge which is arranged for cooperation with a suspension chamber and a collecting device arranged at the lower end of the chamber.

    摘要翻译: 通过磷酸和含Ca材料之间的直接反应制备动物饲料级磷酸盐,例如单磷酸钙,二磷酸钙或其混合物。 将精细研磨的预热的碳酸钙悬浮液与合适量的预热的磷酸反应,将反应物引入短的管状反应区,在一端开放,由此产生气体并在反应中强烈混合反应物 区域发生。 通过反应形成的气体从管状反应区排出或喷出发泡反应混合物,反应基本上完成,同时混合物的各个颗粒自由地悬浮在空气或气体中,然后以形式收集反应的混合物 的具有改善的处理性能的自由流动的颗粒,而不进行任何进一步的颗粒处理。 用于执行该方法的装置包括分别与用于碳酸钙悬浮液和磷酸的单独进料管线连接的反应室,以及用于收集和进一步处理所得反应产物的装置。 反应室具有管式反应器的形式,该管式反应器具有敞开的端部,该开口端部形成排放物,该排出口布置成与悬浮室配合,以及布置在室的下端的收集装置。