Efficiency of Shell Waste as a Source of Calcium Carbonate to Produce Calcium Oxide through Calcination Process

Aims: The aim of this research is to examine the efficiency of batik shellfish shells as a source of calcium carbonate to produce calcium oxide compounds. Study Design:  The type of research is Experimental. Place and Duration of Study: Sample: Department of Physics Education, Kristen Indonesia University, Jakarta, between June 2023 and December 2023. Methodology: There are two stages in the research process, namely the first stage is the preparation and sterilization of batik shellfish shells. The second stage is the calcination of batik shellfish shells to produce CaO Clean the batik shellfish shells using distilled water. Then crush them using a hammer until they become small fragments. Next, dry the small fragments of batik shellfish shells by air-drying them in a closed room. Then, the sample inside the container will undergo calcination process using a furnace/heating furnace with temperature variations of 800°C and 900°C for 8 hours. Results: The results obtained show the formation of CaO compounds with the characteristic white color of CaO powder and small or fine particle size. The average efficiency of CaO compounds resulting from the calcination of batik shellfish shells at a temperature of 800°C is 61.85%. Meanwhile, the average efficiency of CaO compounds resulting from the calcination of batik shellfish shells at a temperature of 900°C is 55.64%. Conclusion: The average efficiency of CaO compounds resulting from the calcination of batik shellfish shells at 800°C is greater than the average efficiency of CaO compounds obtained at a calcination temperature of 900°C. This is because the higher the temperature, the purer the CaO compounds produced will be. Therefore, the CaO compound produced from calcination at a temperature of 900°C can be utilized as a source of calcium in various fields.