Cobalt tungstate is also called cobalt tungsten oxide, or cobaltous tungstate. Like sodium tungstate and calcium tungstate, cobalt tungstate is also a typical compound of transition metal tungsten. It is an intermediate product of tungsten. A tungstate composed of cobalt ion (Co2+) and tungstate ion [(WO4)2-], the English name is Cobalt(Ⅱ) Tungstate, the chemical formula is CoWO4, the molar mass is 306.77 g/mol, and the CAS number is 12640-47 -0.
From the perspective of physical and chemical properties, the appearance of CoWO4 is a blue powder with a wolframite structure and a density of 7.8g/cm3. It can exist stably in a neutral solution and is easily decomposed by carbonates. Note: wolframite has two kinds of monoclinic crystal system and orthorhombic columnar crystal system, the crystal form is plate or column, and the aggregates are mostly plate.
From the perspective of preparation methods, the production methods of CoWO4 include low-temperature molten salt method, precipitation method, hydrothermal method, spray pyrolysis method, etc. Among them, the low-temperature molten salt method has a better prospect for industrial application. It is not only simple to operate, but also has low technical requirements for equipment, which is conducive to large-scale production. The steps for producing cobalt tungstate by the low-temperature molten salt method are: 1) firstly configure the mixed molten salt of lithium nitrate and sodium tungstate according to the mass ratio of 1.17:1; 2) slowly add the sodium tungstate solution into the cobalt chloride solution, and Mix well; 3) Filter the mixture in step 2), wash and dry to obtain the cobalt tungstate precursor; 4) Mix the mixed molten salt in step 1) with the CoWO4 precursor, then heat, keep warm, and cool to room temperature That’s it.
From the point of view of application, cobalt tungstate can be used as antiknock additive, pigment additive, catalyst, microwave dielectric ceramic and photoanode material, etc. Extended information: Microwave dielectric ceramics are used as resonators, filters, dielectric antennas, etc., and are widely used in microwave technology fields such as mobile phones, TV satellite receivers, radars, and radio remote controls. Photoanode materials are mainly used in the field of photoelectrochemical catalysis, which can directly convert solar energy into chemical energy.
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