After wolframite is pulverized and reacted with sodium hydroxide to generate sodium tungstate, the solution is filtered and purified, and then undergoes metathesis reaction with calcium chloride solution to obtain calcium tungstate, which is then treated with hydrochloric acid, and the generated tungstic acid is washed, Dry and pulverize to obtain the finished tungstic acid. Calcium tungstate-hydrochloric acid decomposition reaction equation of tungstic acid is:
MnWO4•FeWO4+ 4NaOH → 2Na2WO4 + Fe(OH)2•Mn(OH)2
Na2WO4+ CaCl2→ CaWO4+ 2NaCl
CaWO4+ 2HCl → H2WO4+CaCl2
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