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Weldon process

The Weldon process is a process developed in 1870 by Walter Weldon for recovering manganese dioxide for re-use in chlorine manufacture.

Additional recommended knowledge

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 + 3H2O + 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.

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Weldon_process". A list of authors is available in Wikipedia.
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