Poland (metallurgy)

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Poland is called a special metallurgical cleaning process for molten metals . The molten metal is cleaned by introducing oil or natural gas (including methane ) by reducing unwanted oxides and eliminating foreign gases through mixing. Furthermore, a place refining instead, d. H. Foreign matter is deposited on the surface of the melt. In the past, instead of oil or natural gas, fresh wood was added to the melt, which produced pole gases (water vapor, hydrogen, carbon monoxide , gaseous hydrocarbons and other decomposition products of the wood).

There are reduction processes through hydrogen , carbon monoxide and methane and oxidation processes through the atmospheric oxygen.

In copper refining , a distinction is made between sealing poles (removal of sulfur dioxide SO 2 ) and tough poles (reduction of copper (I) oxide Cu 2 O ).

See also

Individual evidence

  1. ↑ Entry on copper. In: Römpp Online . Georg Thieme Verlag, accessed on July 1, 2014.
  2. ↑ Entry on tin. In: Römpp Online . Georg Thieme Verlag, accessed on July 1, 2014.