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Deferrisation / Demanganisation (catalytic):
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Catalytic deferrisation/demanganisation by pyrolusite
For years we have successfully used pyrolusite for the catalytic deferrisation and demanganisation of ground and process water. The granular pyrolusite can be used both in pressurised and unpressurised systems. It works as an insoluble catalyst and speeds up the reaction between dissolved oxygen and iron compounds that can be found in many different types of water. In most groundwaters, iron is found as iron bicarbonate - which can be traced back to excess carbon dioxide. In this state it cannot be removed by filtration because the carbonate remains soluble even at a pH of greater than 6.5.
Pyrolusite acts as a catalyst between oxygen and soluble iron compounds and produces iron hydroxide which precipitates out and is easily filtered. Because of its physical properties Pyrolusite is an excellent filter material that simply needs to be cleaned by periodically back-flushing the unit. After the material has been flushed it is once again ready to use.
Because pyrolusite is not used up during the deferrisation it offers an economic advantage compared to other deferrisation-materials. Further advantages are that there is very little material lost due to abrasion, use in a wide temperature range and also that no chemicals are required to regenerate it.
Pyrolusite can be used as a filter material for demanganisation with the same confidence as it is for deferrisation. |
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