In order to support clean production in small carbide welding workshops, this study investigates the recycling of solid carbide welding waste as a raw material for gypsum (CaSO₄) manufacture. Solid waste from welding workshops, primarily in the form of Ca(OH)₂ slurry with a high CaO content (71.58%), was first calcined to obtain CaO and then reacted with sulfuric acid (H₂SO₄) under varying conditions. Experiments were conducted using 2 g of CaO and 100 ml of H₂SO₄ solution at different acid concentrations (9–12 N), reaction temperatures (30–60 °C), and reaction times (20–60 minutes), with stirring at 100 rpm. The study found that waste-derived CaO can be converted into gypsum, and the highest conversion value of 34.98% was achieved using 12 N H₂SO₄ at 50 °C for 40 minutes. This approach offers a practical method for reducing hazardous solid waste from welding workshops while contributing an alternative raw material source for the growing industrial demand for gypsum.
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year={2026},
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