Tungstic Acid Producing Method
Common seen tungstic acid producing method is tungsten concentrate soda sintering method, tungsten concentrate soda solution pressure digestion and sodium hydroxide solution decomposition method.
Tungsten concentrate soda sintering method
Grind tungsten concentrate to pass 180mesh sieving, add soda, niter in a certain ratio and put into sintering furnace. Calcinating under 800~900℃, smelting for 2~3h, froze, crush and heat in leaching extracter. After leaching, filter by cask filter. The filtration is dealed by purification, concentration, crystallization, dehydration to obtain tungstic acid.
Tungsten concentrate soda solution pressure digestion
Grinding tungsten concentrate and add in water to make sizing agent, put into digester and add in soda solution. Heat to 200-225℃ with stirring. After decomposition, leaching, filtering, The filtration is then dealed by purification, concentration, crystallization to obtain tungstic acid.
Sodium hydroxide solution decomposition method
Grinding the calcinated tungsten concentrate to pass through 320mesh, soda boiling and add water and mix, add NaOH solution, boiling, filter. The filtration is then dealed by purification, concentration, crystallization to obtain tungstic acid.
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