Industrial Utilization of Selenium and Tellurium

Abstract

SeleniumScrubber Solutions SELENIUM is widely distributed over the world's surface, but the total amount has been calculated to be equal only to that of gold or bromine. The availability of tellurium is less than half that of selenium, and both of these elements are usually classed among the rarer elements. However, they are not rare in the sense of being unavailable to commerce, since nearly 1,000,000 pounds of selenium are recovered yearly in peacetime. World production of tellurium is about 200,000 pounds yearly.Selenium and tellurium are readily available because they are concentrated in small amounts in most of the important sulfide ores of copper, silver, gold, and nickel-copper which are mined in the United States, Canada, Mexico,

Selenium Dioxide: Preparation, Properties, and Use as Oxidizing Agent.

“…In an earlier review relating to the industrial uses of selenium and tellurium (252), it was pointed out that selenium dioxide and selenic acid are less stable than corresponding sulfur and tellurium compounds, as shown by the following heats of formation expressed in kilogram-calories: This marked difference in the heats and free energies of formation may explain why selenium dioxide, selenites, and selenates have outstanding oxidizing properties in comparison to their tellurium and sulfur analogues; that is, oxygenated selenium compounds are able to give up their oxygen more readily to reducing agents. Fisher and Eisner (77) find that tellurium dioxide, for example, is far less satisfactory than selenium dioxide as an oxidant for organic compounds.…”

Nonlinear Band Gap Tunability in Selenium–Tellurium Alloys and Its Utilization in Solar Cells

“…Selenium (Se) was the first solid material to show photovoltaic properties and was used for the production of the first solar cell more than 100 years ago. − As so, Se was laying the foundation for the research of semiconductors and the understanding of their unique properties. Se was extensively studied and used as a semiconductor for various applications along those early years . Upon the emergence of silicon (Si), which allowed better control of the material properties, the use and research of Se as a semiconductor for photovoltaic applications slowly declined. − One field in which Se is still widely used today as a semiconductor is for X-ray detection.…”

“…Se was extensively studied and used as a semiconductor for various applications along those early years. 4 Upon the emergence of silicon (Si), which allowed better control of the material properties, the use and research of Se as a semiconductor for photovoltaic applications slowly declined. 5−7 One field in which Se is still widely used today as a semiconductor is for X-ray detection.…”

Отравление Селеном И Его Соединениями В Промышленности И Быту

“…Отруєння характеризується змінами зі сторони серцево-судинної системи з можливим розвитком тяжкої гіпотензії, яка виникає в результаті зниженої скоротливості кардіоміоцитів внаслідок токсичної кардіоміопатії і надмірно низького опору периферичних судин [3, 10,15]. Об'єктивно відмічається глухість серцевих тонів.…”