电石渣湿法脱硫中结晶产物的影响因素研究

电石渣湿法脱硫中结晶产物的品质直接影响后续脱硫石膏的资源化利用。基于此，系统研究了pH、氧化时间和电石渣粒径对电石渣湿法脱硫中结晶产物含水率、亚硫酸盐含量、矿相组成和微观形貌的影响。结果表明，较高pH会限制亚硫酸钙与溶解氧的接触，当pH在4.00~4.50时亚硫酸钙的氧化效果较好；初始阶段氧化速率受时间影响显著，6 h后氧化速率趋于平稳；电石渣粒径过大会导致比表面积减小，降低亚硫酸钙与溶解氧的接触面积，粒径过小则在生成亚硫酸钙时容易发生静电团聚现象，导致粒径增大、氧化率降低。因此，当电石渣粒径为75.00~93.75 μm、pH为4.0、氧化时间为6 h时，结晶产物（二水合硫酸钙）的结晶效果最好。

Influencing factors of crystallization products in wet desulfurization of carbide slag

The quality of crystalline products in the wet desulfurization of carbide slag directly affects the subsequent resource utilization of desulfurization gypsum.In this work，the effects of pH，oxidation time and calcium carbide slag particle size on the water content，sulfite content，mineral phase composition，and microscopic morphology of crystalline products in calcium carbide slag wet desulfurization were systematically investigated.The results showed that high pH limited the contact between CaSO₃ and dissolved oxygen.The pH was 4.00~4.50，the oxidation effect of CaSO₃ was the best.In the initial stage，the oxidation rate was significantly influenced by time and the oxidation rate was leveled after 6 h.Too large particle size of calcium carbide slag was led to the surface area decreased，which reduced the contact area between CaSO₃ and dissolved oxygen，and too small particle size was prone to electrostatic agglomeration when generating CaSO₃，resulting in larger particle size and lower oxidation rate.Therefore，when the particle size of carbide slag is 75.00~93.75 μm，the pH is 4.0 and the oxidation time is 6 h，the crystallization effect of the product（calcium sulfate dihydrate） is the best.