<![CDATA[The acetylene gas industry generates substantial carbide lime waste (Ca(OH)2, which poses environmental challenges but offers potential as a calcium source for precipitated calcium carbonate (PCC) production. This study synthesized PCC from carbide lime waste using a Bubble Column Reactor (BCR) and optimized the carbonation process using Response Surface Methodology (RSM). The effects of Ca(OH)2 concentration (3–7%) and CO2 flow rate (3–7 L/min) on PCC purity, product mass, and yield were evaluated. The products were characterized using acid–base titration, SEM–EDX, and X-ray diffraction (XRD). SEM–EDX analysis showed that the carbide lime waste contained 44.64 wt% calcium, confirming its suitability as a calcium source. Both Ca(OH)2 concentration and CO2 flow rate significantly influenced PCC production. The optimum condition was achieved at 7% Ca(OH)2 and a CO2 flow rate of 5 L/min, producing PCC with 99.88% purity and 82.85% yield, meeting the purity requirement for paper-grade filler. These findings demonstrate the potential of carbide lime waste valorization as a sustainable waste-to-resource strategy integrating industrial waste reduction, value-added material production, and CO2 utilization. Contribution to Sustainable Development Goals (SDGs):SDG 9 — Industry, Innovation and InfrastructureSDG 12 — Responsible Consumption and ProductionSDG 13 — Climate Action]]>
Copyrights © 2026
