Jisho

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せいれん 精錬
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Noun, Suru verb, Transitive verb
1. refining; refinement; smelting​
Noun, Suru verb, Transitive verb
2. training​Only applies to 精錬, Only applies to 精煉, See also 精練
Place
3. Seiren​
Wikipedia definition
4. Refining (metallurgy)​Refining (as in non-metallurgical uses) consists of purifying an impure material, in this case a metal. It is to be distinguished from other processes such as smelting and calcining in that those two involve a chemical change to the raw material, whereas in refining, the final material is usually identical chemically to the original one, only it is purer. The processes used are of many types, including pyrometallurgical and hydrometallurgical techniques.
Read “Refining (metallurgy)” on English Wikipedia
Read “精錬” on Japanese Wikipedia
Read “Refining (metallurgy)” on DBpedia
Other forms
製錬 【せいれん】、精煉 【せいれん】
Notes
精煉: Rarely-used kanji form.

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