OPTIMIZATION OF CALCIUM OXIDE EXTRACTION FROM CARBIDE LIME VIA ACID LEACHING: A RESPONSE SURFACE METHODOLOGY ANALYSIS; [(Pengoptimuman Pengekstrakan Kalsium Oksida Daripada Kapur Karbida Melalui Pencucian Asid: Analisis Kaedah Tindak Balas Permukaan)]

• Published in: Malaysian Journal of Analytical Sciences
• Main Author: Mansor M.J.A.; Hieng K.W.P.; Rosli S.N.A.; Othman N.H.; Yusoff M.H.M.; Abidin S.Z.
• Format: Article
• Language: English
• Published: Malaysian Society of Analytical Sciences 2024
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85210258458&partnerID=40&md5=81a777e35fc9e094f14e82066d1d926b

Calcium oxide (CaO) is one of the inorganic compounds that is widely used in industry. CaO is typically obtained through the thermal decomposition of calcite (calcium carbonate). However, with the growing need for CaO, an eco-friendly approach has emerged that focuses on deriving calcium oxide from calcium waste, especially carbide lime. The escalation in carbide lime waste is linked to the surging demand for acetylene gas, significantly contributing to the production of this by-product. The objective of this paper is to extract CaO from carbide lime by studying the interaction of each condition affects the extraction process. By using Response Surface Methodology (RSM) and Central Composite Design (CCD) with Design Expert® software, the study aims to find the best conditions for extracting CaO from carbide lime. It focuses on factors like acid concentration, leaching temperature, and solid-to-liquid ratio as independent variables. Based on RSM results, the solid-liquid ratio (S/L ratio) has a strong effect on the purity of extracted CaO, while the acid concentration and leaching temperature have the most significant effect on the yield. The best conditions to achieve the maximum yield and purity of CaO include a 2 M acetic acid concentration, a leaching temperature of 58.32 °C, and a solid-to-liquid ratio of 9.72 g/100 mL. Based on the optimum condition of the experiment, it has resulted in a yield of 64.20% and a purity of 98.63%. © 2024, Malaysian Society of Analytical Sciences. All rights reserved.