磷酸盐粘结剂旧砂热法再生的研究  

Study on Recycling of Phosphate Binder Used Sand by Thermal Method

作　　者：王辛 张友寿 夏露 王超 骆志鹏 WANG Xin;ZHANG You-shou;XIA Lu;WANG Chao;LUO Zhi-peng(School of Materials and Chemical Engineering,Hubei University of Technology,Wuhan 430068,Hubei,China;Hubei Provincial Key Laboratory of Green Light Industrial Materials,Ltd.,Wuhan 430068,Hubei,China)

机构地区：[1]湖北工业大学材料与化学工程学院,湖北武汉430068 [2]绿色轻工材料湖北省重点实验室,湖北武汉430068

出　　处：《铸造》2022年第7期883-887,共5页Foundry

摘　　要：通过加热结合机械摩擦的方法对磷酸盐无机粘结剂自硬砂进行再生回用研究,探究再生砂使用时型砂脱模时间、砂型强度、存放稳定性等综合性能。结果表明,不同温度处理再生砂在回用过程中的固化速度均快于全新砂,但温度不同,硬化速度有所不同;不同温度处理再生砂砂样的抗拉强度差距较小且与新砂相当,但抗压强度差距较明显,而且明显高于全新砂;再生砂制备的砂型在常湿环境和高湿环境的存放稳定性均优于全新砂制备的砂型;经过循环使用再生砂发现,随着循环次数的增加,型砂性能并未出现恶化,依然具有较好的回用性,分析认为再生砂的上述这些性能与旧砂中的残留粘结产物和后续粘结剂之间发生反应形成更稳定结构具有密切关系。The regeneration and reuse of phosphate inorganic binder self-hardening sand was studied by heating combined with mechanical friction,and the comprehensive properties of sand stripping time,sand strength and storage stability were explored when recycled sand was used.The results showed that the curing rate of the recycled sand treated at different temperatures was faster than that of new sand in the recycling process,but the hardening rate varied with different temperatures.The tensile strength difference of the recycled sand at different temperatures was small and similar to that of new sand,but the compressive strength difference was obvious,which was significantly higher than that of the new sand.The storage stability of sand mold prepared with the recycled sand in the normal humidity environment and high humidity environment was better than that of the sand mold prepared with the new sand;it is found that with the increase of the number of cycles,the performance of the molding sand did not deteriorate,and it still had good reusability.The analysis showed that these properties of the recycled sand were closely were related to the reaction between the residual bond products in the old sand and the subsequent binders to form a more stable structure.

关 键 词：磷酸盐无机粘结剂 再生回用 固化速度 砂型强度 存放稳定性 

分 类 号：TG221[金属学及工艺—铸造]