The following methods is for calcium tungstate manufacturing process:
1.Mix sodium tungstate and sodium sulfide and dissolve into water, then add zinc chloride aqueous solution. After filtration, treat filtrate with calcium chloride, and then we can get calcium tungstate.
2.Calcium oxide/calcium hydroxide reacts with tungsten oxide/tungsten tetrahydroxide in alkali hydroxide/carbonate solution, and then calcium tungstate is obtained.
3.Burning tungsten trioxide and calcium carbonate in 1070℃ or treatment between sodium tungstate solution and calcium chloride solution or processing scheelite.