Products


Chlor-Alkali | Chlorate


NMT® Electrodes is a leading manufacturer and supplier of Mixed Metal Oxide and Platinised Titanium Anodes for use in the production of Sodium Chlorate and Potassium Chlorate, both of which are used extensively in the pulp and paper manufacturing industry as an environmentally friendly alternative to conventional bleaching processes.

 

NMT® Electrodes continuously strives to improve on all of our current anode coatings and is committed to the development of newer anode coatings that are able increase the efficiency of chlorate production, reduce the operating costs, are able to operate at significantly higher current densities and exhibit longer design lives.

 

Our numerous years of experience in the Electrochemical industry allows us to provide our customers with tremendous expertise on the best anode coating formulations and coating loadings to ensure our anodes are suited directly to the design life and application specifications required.

 

Our coatings have lower oxygen evolving properties which mean that they exhibit higher current efficiencies, resist impurity build-up on the anodes themselves, hereby giving our anodes a longer design life.

 

 

Background on Sodium Chlorate Production

 

Sodium chlorate is a salt that is primarily used in the manufacture of chlorine dioxide, an environmentally friendly bleaching agent that is used in the pulp and paper bleaching process. Chlorine dioxide (ClO2) is used as a substitute for Cl2, which reduces the amount of chlorinated organic compounds in bleaching effluents, hence the reason it has been dubbed “environmentally friendly”. The production of sodium chlorate has turned into a major chemical industry with more than 2-3 million tons being produced worldwide per year, the vast majority of which, ≈ 90%, is used to produce chlorine dioxide for the pulp and paper bleaching industry.

 

The anodic and cathodic reactions are the same in chlorate production as in hypochlorite (bleach) production. Room temperature, basic (alkaline), dilute hydroxide solutions yield mostly hypochlorite, and hence the hydroxide that is used must be hot, concentrated and more acidic when chlorine gas is bubbled through it for the production of chlorates of a higher oxidation state.

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