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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Betterton–Kroll process ： ウィキペディア英語版 Betterton–Kroll process The Betterton–Kroll process is an industrial process for removing bismuth from lead. The process was developed by William Justin Kroll and patented in 1922. Further improvements were developed by Jesse Oatman Betterton in the 1930s. Calcium and magnesium are added to a molten lead-bismuth bath. The resulting bismuth compounds have higher melting points and lower densities than the lead, and can be removed as dross. The compounds are treated with chlorine to free up the bismuth. Temperature used in the process is about 380–500 °C(572–932 °F) . The other major processes for separating the two metals are by fractional crystallization and by the Betts electrolytic process.〔Samans, Carl H. ''Engineering Metals and their Alloys'', 1949 MacMillan〕 ==See also== *Lead smelter 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Betterton–Kroll process」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.