Calcium tungstate

Calcium tungstate (CAS 7790-75-2), also referenced commercially as C.I. 77250, is an inorganic calcium salt of tungsten used as a functional material in specialized industrial and electronic applications.

It occurs naturally as the mineral scheelite and serves as a primary source mineral for tungsten extraction in mining operations. In mining and metallurgy, calcium tungstate ore concentrates are processed.

These concentrates are used to recover tungsten metal and intermediate compounds used in hard alloy and tooling production. The compound is also used in scintillation applications for industrial imaging.

Its luminescent response to X-ray and gamma radiation makes it a material of interest for detector components and imaging screens. In electronics, it is evaluated as a substrate or functional material.

It is utilized in thin-film and optical device manufacturing. Pigment applications under C.I. 77250 also exist in specialty coatings where controlled luminescence or whiteness is required for the finish.

Calcium tungstate is available as a white crystalline powder in varying particle size distributions to suit processing requirements. Technical and high-purity grades are the most commonly supplied.

Purity levels are typically specified at 99% or above for electronic and scintillation uses. Synthetic grades are distinguished from natural scheelite concentrates, which are supplied as ore fractions.