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Information @ a Glance

Introduction

  • Selenium  is a chemical element with the atomic number 34, represented by the chemical symbol Se.
  • Selenium is a trace mineral found in soil, water, and some foods. It is an essential element in several metabolic pathways.
  • Selenium is a component of glutathione peroxidase, which possesses antioxidantactivity and demonstrates antioxidant properties in humans.
  • Selenium exists in several allotropic forms, although three are generally recognized.

Extraction Process

  • Selenium is most commonly produced from selenide in many sulfide ores, such as those of copper, silver, or lead.
  • It is obtained as a byproduct of the processing of these ores, from the anode mud of copper refineries and the mud from the lead chambers of sulfuric acid plants.
  • Steps involved in the extraction of Selenium are : Soda Ash Roasting, Sulfation Roasting, Wet Chlorination, Copper-Lead Slimes Treatment.

Market

  • Growth in selenium consumption was historically driven by steady development of new uses, including applications in rubber compounding, steel alloying, and selenium rectifiers.
  • The main drivers for increased selenium usage are considered to be the continued expansion of the glass industry, fertilizers and usage in the health industry.
  • The outlook for selenium is positive, and with its substitution difficult in most applications.
  • The principal markets for selenium are in electronics (30%), glass manufacturing (20%), pigments (19%), metallurgical additives (14%) and agricultural/biological applications (6%).

Uses

  • Selenium is used in Xerography for reproducing and copying documents, letters, etc.
  • Selenium is used to decolorize the green tint caused by iron impurities in glass containers and other soda-lime silica glass.
  • The major market areas for selenium are glass manufacture and pigments.
  • The major use of selenium in electronics is in the form of arsenic triselenide, which is used as a photoreceptor in xerography.
  • Selenium is widely used in cadmium sulfoselenide pigments.

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