CaS->CaO->Ca(OH)2->Ca3(PO4)2

Question

CaS->CaO->Ca(OH)2->Ca3(PO4)2

Answer 1

2 CaS+3 O2=2 CaO+2 SO2

CaO+H2O=Ca(OH)2

3 Ca(OH)2+2 H3PO4=Ca3(PO4)2+6 H2O