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- Name : Indium
- Symbol : In
- Atomic # : 49
- Atom weight: 114.82
- Melting P. : 156.61
- Boiling P. : 2080
- Oxidation : +3
- Pronounced : IN-di-em
- From : Latin indicum, the color indigo
- Identified : Ferdinand Reich and Theodor Richter in 1863
- Appearance : Very soft, silvery-white metal
- Note : Used to make low-melting point compounds
-
- [Properties]
-
- Indium is characterized as a soft and malleable, silver-white metal. It
- looks a lot like aluminum, but feels more like tin. Like tin, pure indium
- emits a squealing sound when it is bent.
- This metal is so soft that you can wipe it onto other objects in much
- the same way as you can wipe graphite or pencil lead. Pure indium can be
- highly polished, and it will retain the shine because it is corrosion
- resistant.
- The low melting point contributes to its commercial value as an alloying
- agent for soldering material. Indium is a member of the carbon group of
- elements, Group IIIA, on the periodic table.
- Over a thousand kilograms of indium are recovered each year from the flue
- dust of zinc refineries. Concentrations from this source are typically on
- the order of 1 part per 1000. An acid leaching process allows the indium
- to be recovered as indium sulfate from other flue metals such as
- aluminum, arsenic, cadmium, and zinc.
- The indium that is recovered from the flue dusts can be purified by
- means of an electrolysis procedure. The electrolyte in this case is
- aqueous indium sulfate.
-