湿法再生技术在铸造粘土废砂资源化中的应用

The Application of Wet Recycling Technology in the Resource Utilization of Foundry Clay Waste Sand

摘要: 针对铸造粘土废砂传统处置方式导致的土地侵占、资源浪费及环境污染问题，本研究提出以湿法再生技术为核心，结合“机械–热法–湿法”三级工艺耦合的创新路径。通过开发选粉脱膜机、复式焙烧炉及强力擦洗机等核心装备，突破传统再生技术瓶颈；在湿法环节创新采用梯度压力旋流分离、SDBS-聚醚改性硅氧烷复配药剂及闭式水循环系统，显著提升再生砂洁净度与稳定性。工业化应用表明，本技术实现再生砂含泥量小于0.3%、角形系数接近新砂，可替代新砂用于高端铸件生产，为铸造业绿色转型提供技术支撑。

Abstract: In response to the problems of land occupation, resource waste and environmental pollution caused by traditional disposal methods of foundry clay waste sand, this study proposes an innovative path with wet recycling technology as the core, combined with the “mechanical-thermal-wet” three-stage process coupling. By developing core equipment such as powder selection and film removal machines, compound roasting furnaces and powerful scrubbing machines, the bottlenecks of traditional recycling technologies are broken through. In the wet process, innovative adoption of gradient pressure cyclone separation, SDBS-polyether modified siloxane compound reagents and a closed water circulation system significantly improves the cleanliness and stability of recycled sand. Industrial application shows that this technology enables the recycled sand to have a mud content of less than 0.3% and an angular coefficient close to that of new sand, which can replace new sand in the production of high-end castings, providing technical support for the green transformation of the foundry industry.