NOVELTY - Incinerated ash containing phosphorus and aluminum is mixed with alkaline reaction liquid. Phosphorus and aluminum are extracted (S1) to obtain mixture of aluminum-containing phosphorus extract and alkali-treated ash. The mixture is solid-liquid separated (S2), the separated aluminum-containing phosphorus extract is mixed with a silicon solution, and aluminum is deposited as aluminosilicate. The mixture is solid-liquid separated (S5), phosphorus-containing liquid is mixed with a calcium compound, and phosphorus is deposited (S6) as calcium phosphate.    USE - Manufacture of calcium phosphate from incinerated ash e.g. incinerated ash of sludge from sewage works, useful as raw material of calcium superphosphate used in fertilizers.    ADVANTAGE - The method provides calcium phosphate which enables manufacture of calcium superphosphate stable in usage amount of sulfuric acid.    DETAILED DESCRIPTION - Incinerated ash containing phosphorus and aluminum, and an alkaline reaction liquid are mixed. Phosphorus and aluminum in the ash are extracted in the alkaline reaction liquid, to obtain a mixture of aluminum-containing phosphorus extract and alkali-treated ashes. The mixture is solid-liquid separated, and the separated aluminum-containing phosphorus extract is mixed with a silicon-containing solution. Aluminum in the aluminum-containing phosphorus extract is deposited as aluminosilicate to obtain (S3) a mixture of aluminosilicate and phosphorus-containing liquid. The mixture is solid-liquid separated, the separated phosphorus-containing liquid is mixed with a calcium compound, and phosphorus in the phosphorus-containing liquid is deposited as calcium phosphate. An INDEPENDENT CLAIM is included for calcium-phosphate manufacturing apparatus consisting of an alkaline-reaction-liquid supplier, a phosphorus extraction tank, solid-liquid separator (I), a silicon-containing-solution supplier, an aluminosilicate-salting-out tank, solid-liquid separator (II), a calcium-compound supplier, and a calcium-phosphate precipitation tank.    DESCRIPTION OF DRAWING(S) - The drawing shows an operational flow diagram of the manufacturing method of calcium phosphate. (Drawing includes non-English language text)    Phosphorus extraction process (S1,S8)    Solid-liquid separation processes (S2,S5)    Aluminosilicate salting-out process (S3)    Silicon-containing solution preparation process (S4)    Calcium-phosphate precipitation process (S6)