Dissertation > Industrial Technology > General industrial technology > Materials science and engineering > Non-metallic materials > Non-organic materials

Research in the Urification of Aphianitic Graphite

Author LiuJianPing
Tutor ZhangQingZuo
School Central South University
Course Materials Science
Keywords aphianitic graphite purification soda melting acid leaching chemical dynamics.
Type Master's thesis
Year 2004
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Being an important nonmetal mineral with widely applying field, more and more natural graphite is needed to drive the society moving ahead when the quality of available squama-liked graphite resource keep atrophying. Tor efficient the exploitation of aphianitic graphite resource, research aiming to purify aphianitic graphite mined in China have been carried out, which has a carbon content 84.18%.Production method though which graphite with the carbon content 99.75% can be produced has been tackled down with the following parameters: 15 grams of soda, melting temperature from 450 C to 550 C, 5 hours of melting time in soda melting process and the additional of hydrochloric acid and hydrofluoric acid are 30ml and 50ml respectively the leaching temperatures is 70 C. After a three-hours long leaching process, graphite with CGD%99.75%, V%=0.1%,Si%=0.08%, Al%<0.03%,Fe<0.03% can be produced.Phase in purifying process have been researched though technical XRD and analytical chemistry methods. When the chemical dynamics research of silicon in graphite was carried out, chemical process was found to be the restraining process, the chemical dynamics formula was confirmed asand the essential constants have been made sure to beFinally, the chemical beheave of sicilon and aluminum in acid leaching process have been studied though comparison method.

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