Creating strength.

Selenium Free

What is Selenium?

The element Selenium is a member of the sulfur family and resembles sulfur both in its various forms and in its compounds. It is found in association with tellurium in a few rare minerals. Most of the world’s selenium is recovered from the anode muds from electrolytic copper refineries. Selenium finds its most important applications in the photocopying, glass making and pigments industries; it is also a component of rectifiers and photocells. Another application of selenium is as an additive in the production of electrolytic manganese metal.

The electrowinning of manganese metal results in a relatively low current efficiency due to the low reduction potential of the element manganese and the subsequent high potential for the evolution of hydrogen. In order to suppress the hydrogen evolution reaction selenium can be added to the electrolyte. The improvement in current efficiency increases yields and results in a substantial saving in production costs. Unfortunately, the majority of the selenium added to the electrolyte will report to the cathode product thus contaminating the manganese.

Why we choose Selenium free

MMC chooses to employ a selenium free process. Selenium free manganese (99.9% Mn) is purer, safer and more environmentally friendly than selenium containing manganese (99.7% Mn).
Selenium is unique among trace elements in that toxicity can occur at concentrations only slightly higher that those required for normal metabolism.
The use of selenium in manganese production has the following detrimental effects:

Selenium free manganese is purer
The selenium contamination of electrolytic manganese results in a product with a metal purity of 99.7% Mn, whereas selenium free manganese has a metal purity of 99.9% Mn. The selenium content in manganese metal produced using the selenium technology can be as high as 0.15%.
Hydrogen selenide and other selenium compounds are toxic
Selenium compounds are hazardous to the environment

Download: Selenium MSDS

15 Heyneke Street, Industrial Area, Mbombela
PO Box 323, Mbombela, 1200, South Africa

Tel: +27 (0)13 759 4600
Fax: +27 (0)13 752 7657

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