Debismuthizing of Lead with Alkaline and alkaline Earth Elements

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Gheysari, Masoud | 2011

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 42693 (07)
University: Sharif University of Technology
Department: Materials Science and Engineering
Advisor(s): Yoozbashizadeh, Hossein; kaflou, Ali
Abstract:
Lead produced by pyrometallurgy method has a number of impurities. Most of these eimpurities can easily be removed, but this property does not apply in the case of bismuth. Since chemical properties of bismuth are close to the lead, refining of bismuth below 250 ppm is difficult and expensive. Because of problems related to electrochemical discussion of the batteries, bismuth it is possible to reduce below than 20 ppm. Jollivet and Dittmer process is capable of reducing bismuth below 20 ppm. As the main goal of this project is to reduce bismuth to small amounts, Jollivet process was used. Potassium needed for Jollivet process, produced by electrolysis of Potassium chloride salt. Debismuthizing by Jollivet process is done in three different ways, low temperature (370-380oC), adding bismuth and high temperature (580-600oC). In high temperature test, with the addition of 0.3wt% potassium as Lead-Potassium master alloy and 0.6wt% magnesium as pure, in three stages,The bismuth content decreased from the baseline value of 80 ppm to 10 ppm
Keywords:
Lead ; Potassium ; Magnesium ; Debismuthizing ; Jollivet Process

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