Production method for preparing ammonium molybdate by calcium molybdate raw material ammonium phosphate mixed solution transformation method

The invention discloses a production method for preparing ammonium molybdate by a calcium molybdate raw material ammonium phosphate mixed solution transformation method, which comprises the followingsteps: S1, mixing a calcium molybdate raw material and a transformation mother solution containing ammonium phosphate to obtain primary transformation slag and a primary transformation mother solution, S2, treating the primary transformation slag with an ammonium phosphate solution multiple times to obtain a transformation mother liquor containing ammonium phosphate and final transformation slag,wherein the transformation mother liquor is used as a raw material for mixing the transformation slag and/or a calcium molybdate raw material, S3, mixing the primary transformation mother liquor and ammonium sulfide, and then filtering the transformation mother liquor, S4, adding cations which generate precipitates together with phosphate ions into the transformation mother liquor, and filtering the transformation mother l