Calcium tungstate is a white crystalline with tetragonal system. It decomposes in hot hydrochloric acid. Also, it is slightly soluble in water and ammonium chloride solution. Its relative density is 6.062g/cm3, chemical formula is CaWO4, where W has a valence of +6.
Producing Processes
1. Processed from natural scheelite.
2. Adopt tungsten trioxide and calcium carbonate as raw materials, and burn at the temperature of 1070°C.
3. Made by the reaction of calcium oxide/calcium hydroxide and tungsten oxide/tungsten hydroxide in alkali metal hydroxide/carbonate solution.
4. Mix sodium tungstate and sodium sulfide, and dissolve in water; Pour zinc chloride solution; Filter; Use pure calcium chloride to handle filtrate; Then, the CaWO4 is prepared.
Applications
1. Raw materials of tungsten chemical series.
2. For the production of ammonium tungstate, tungsten trioxide, tungsten iron, tungsten carbide, tungsten wire and other tungsten alloy products.
2. For fluorescent coatings and X-ray screen, etc.
Storage Notes
Keep in tightly closed container. Keep container sealed. And store in a cool, dry place.
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