Abstract
This study deals with flotation as a method for removing impurities, such as ceramic brick and unreacted graphite, from synthesized diamond. Firstly, a series of flotation tests was conducted on raw synthesized diamond in order to determine the optimum conditions for removing ceramic brick. When kerosene was used as a collector, it was found that the grade of diamond recovered in the froth was high within a pH range of 2 to 4. The recovery and grade of diamond concentrate were about 90% and 95%, respectively. Secondly, to assess the effectiveness of separating unreacted graphite from raw synthesized diamond, a series of tests was carried out using hydrocarbons of C6 to C8, such as cyclohexane, xylene, benzene and n-decane. It was recognized that any hydrocarbon reagent was effective in separating unreacted graphite from raw synthesized diamond in an alkaline region of around pH 11.
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