Utilization of CO₂ from flue gases for Waste ONP and OCC Papers

In this paper we reported the utilization of CO₂ instead of storage existing from coal power plants. The typical flue gas composition of coal combustion flue gases are of O₂, CO₂, N2, SO₂ gases. CO₂ is the major flue gas emitted from coal power plants. This CO₂ could be directly neutralized using fly ash particles because flue gas is acidic and fly ash is alkaline. We investigated the effect of accelerated carbonation for the power plant real flue gases and fly ash particles and we demonstrated the feasibility of direct mineralization of flue gas CO₂ without separation. Accelerated carbonation is simple, novel, economical and ecofriendly process and this process can help sustain the coal and power industry by producing clean energy. It can also protect the air quality from coal-fired power plants. Finally, the accelerated carbonation process is applicable not only to coal-fired power plants, but also to processes that produce flue gas and ash particles. In the present work, we report a novel microstructure of synthesized scalenohedral PCC (precipitated calcium carbonate) without any additives by a simple and ecofriendly carbonation process carried out in a liquid-gas system on the crystal growth of the scalenohedral calcite phase. Especially, the process parameters of Ca(OH)2 concentration and CO₂ flow rates were investigated to enhance the sensitivity of the process. The highest average length of the scalenohedral calcite was obtained at pH 6.0, temperature 45°C, Ca(OH)2 concentration 0.2M, CO₂ flow rate 80mL/min, and total volume 1L. The utilization of flue gas-derived CO₂ from coal fired power plants could be a form of carbon capture and storage using carbonation reaction with scalenohedral PCC. Finally, the synthesized scalenohedral PCC was used as a filer for ONP recycling. We demonstrated all these experiemnts at semi pilot plant scale. This precipitated calcium carbonates used as a filer for ONP/OCC recycling.