This study analyzed the amount of carbon dioxide reduction and economic benefits of detailed processes of CO 2 6,000 tons plant facilities with mineral carbonation technology using carbon dioxide and coal materials emitted from domestic circulating fluidized bed combustion power plants. Coal ash reacted with carbon dioxide through carbon mineralization facilities is produced as a complex carbonate and used as a construction material, accompanied by a greenhouse gas reduction. In addition, it is possible to generate profits from the sales of complex carbonates and carbon credits produced in the process. The actual carbon dioxide reduction per ton of complex carbonate production was calculated as 45.8 kgCO 2 eq, and the annual carbon dioxide reduction was calculated as 805.3 tonCO 2 , and the benefit-cost ratio (B/C Ratio) is 1.04, the internal rate return (IRR) is 10.65 % and the net present value (NPV) is KRW 24,713,465 won, which is considered economical. Carbon mineralization technology is one of the best solutions to reduce carbon dioxide considering future carbon dioxide reduction and economic potential.

Despite the continuous decrease in coal consumption in developed countries, research on coal flotation processes for pretreatment is ongoing due to the deterioration of coal quality and the expansion of small-and medium-sized coal mines. This study attempts to investigate the possibility of applying the flotation process as pretreatment for low-rank and low-grade coal in Indonesia. Three types of collectors, three types of frothers, and one conditioner were used; the separation characteristics according to the coal particle size were also tested. As a result, in the experiment using fine coal with K-L reagent and α-terpineol, suitable separation effects were observed. However, the difference in ash content between floating and sinking products was not significant and the mass recovery rate was relatively low. This implies that it is very difficult to improve coal quality by applying a conventional flotation process.