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Sodium Tungstate Processing

Tungsten trioxide reaction with sodium hydroxide, or using tungsten concentrates pressure cooking with sodium hydroxide, sodium tungstate solution is generated by refining, filtration, ion exchange processes, separating impurities, then evaporated to a crystallization product of sodium tungstate.

Sodium tungstate is created by reacting a hard and soft mixture of tungsten carbide with a mixture of sodium nitrate and sodium hydroxide in a fusion process which overcomes the high exothermicity of the reaction involved.

The dihydrate is produced by dissolving tungsten trioxide or the ground ore in a caustic soda solution, then concentrating and crystallization of the solution.

MnWO₄FeWO₄+4NaOH→2Na₂WO₄•2H₂O+Fe(OH)₂·Mn(OH)₂

Na₂WO₄•2H₂O+CaCl2→CaWO₄+2NaCl

CaWO₄+2HCl→CaCl2+H₂WO₄

H₂WO₄+2NaOH→Na₂WO₄•2H₂O