Weldon process
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The Weldon process is a process for recovering Manganese dioxide in chlorine manufacturing. It was developed in 1870 by Walter Weldon.
After reacting Hydrochloric acid with Manganese dioxide (and related oxides), the waste Manganese(II) chloride solution is treated with lime, steam and oxygen, producing Calcium manganite (IV):
2MnCl2 + 3Ca(OH)2 + O2 → CaO·2MnO2 + H2O + 2CaCl2
The resulting calcium manganite can be reacted with HCl as in related processes:
CaO·2MnO2 + 10HCl → CaCl2 + 2MnCl2 + 2Cl2 + 5H2O
The MnCl2 can be recycled, while the CaCl2 is a waste byproduct.
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