Fundamental Study on Removal of Carbon from Fly ash by Flotation

摘要

Removal of carbon from fly ash to a higher level has been attempted using flotation with kerosene oil as collector. Following pre-treatment was found to be effective in lowering the carbon content: (1) pH adjustment of pulp to the value around 7. (2) Emulsification of oil into aqueous phase before contacting with feed. (3) Modest pregrinding for liberation of organic component. It was also found that kerosene could be replaced by heavy oil A, cheaper and perhaps rather effective due to its surface-active impurities. However, addition of these collector oils required for flotation was still large; this problem should be solved by further improvement of above pretreatments. The purified material is now planned to be subjected to hydrothermal treatment for synthesis of alumino-silicate minerals as kaolinite.