Abstract: To enhance and utilization silicon and aluminum components in blast furnace slag, zeolite molecular sieves were synthesized through a hydrothermal method. This approach employed acetic acid-leaching blast furnace slag as the source of silicon and aluminum. By integrating X-ray diffraction and scanning electron microscopy with energy dispersive spectroscopy, the effects of the silicon-to-aluminum molar ratio, crystallization duration and crystallization temperature on zeolite synthesis were investigated. The results indicate that A-type zeolite can be synthesized in a regular cubic shape following crystallization at 100 ℃ for 8 hours, provided that the n(Si)/n(Al) is maintained between 0.50 and 1.25. Suppose the crystallization time is excessively prolonged or the crystallization temperature is elevated beyond optimal levels. In that case, it may lead to the coarsening of zeolite grains, thereby diminishing their adsorption and catalytic efficacy. When n(Si)/n(Al) is 1.00, and both crystallization time and crystallization temperature are maintained at 8 h and 100 ℃, respectively, the synthesized A-type zeolite exhibits optimal adsorption performance. Through Brunauer-Emmett-Teller and nitrogen adsorption tests, as well as Cu²⁺adsorption experiments, it is confirmed that the A-type zeolite synthesized under these conditions exhibits a larger specific surface area, enhanced nitrogen adsorption performance, and optimal Cu²⁺ adsorption capacity in solution. This further substantiates the optimal synthesis conditions for A-type zeolite. When the dosage of zeolite is set at 8 g/L, the adsorption rate for Cu²⁺reaches 81.82%. Furthermore, if the crystallization temperature is maintained at 90 ℃, it is necessary to extend the crystallization time to 10 h in order to synthesize A-type zeolite with comparable properties.