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. The generated tungstic acid is washed, Dry and pulverize to obtain the finished tungstic acid.
The reaction equation of CTIA GROUP LTD® for the production of calcium tungstate-hydrochloric acid decomposition method with tungstic acid is as follows:
MnWO4•FeWO4+ 4NaOH → 2Na2WO4 + Fe(OH)2•Mn(OH)2
Na2WO4+ CaCl2→ CaWO4+ 2NaCl
CaWO4+ 2HCl → H2WO4+CaCl2
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