This invention relates to a method and apparatus for producing calcium phosphates from phosphoric acid and mineral calcium compounds. More particularly, the invention relates to a method for manufacturing animal feed grade phosphates, mono-calcium phosphate (MCP) and di-calcium phosphate (DCP) or a mixture thereof containing P and Ca in a specified ratio and in a form in which the phosphorus component can be readily absorbed by the animal organism. Such mineral feed additives must comply with certain standards of purity with respect to content of fluorine, arsenic and heavy metals. To facilitate handling and use it is important that these feed grade phosphates are in the form of strong and free-flowing granulates of appropriate liter weight and grain size, and that they possess good storage properties.