Preparation of expanded kish graphite and its use in the adsorption of diesel

Abstract

In the steelmaking process the carbon element in the blast furnace molten iron precipitate kish graphite due to supersaturation when the temperature is getting lower so the blast furnace by-products contain a certain amount of kish graphite Kish graphite is a potential graphite resource that has not been widely developed yet In order to expand the application and value of kish graphite this study prepare graphite intercalation compounds (GICs) by chemical oxidation-intercalation reaction and then forms expanded kish graphite through heat treatment Expanded kish graphite could be used as adsorbent due to low density well-developed network pores and specific surface In this study diesel adsorption experiment is used to evaluate the ability of expanded kish graphite to treat oil pollution In addition this study also use desorption method to regenerate the expanded kish graphite to evaluate its reusability This study concluded that the expanded volume of expanded kish graphite was 79 0 mL/g under the conditions of reaction temperature = 70 ℃ HNO3:H2SO4 = 6:24 L/S = 30 mL/g reaction time = 20 min and heat treatment temperature = 1000 ℃ Subsequent adsorption experiment is discussed under this condition After the adsorption of diesel and desorption experiment adsorption capacity of expanded kish graphite is 339 1 kg-diesel/m3-EG (26 8 g-diesel/g-EG) and it has good stability after five cycles The result shows that expanded kish graphite can be used as a reusable material and achieve the concepts of sustainability and circular economy

Date of Award	2020
Original language	English
Supervisor	Juu-En Chang (Supervisor)