铸造旧砂再生新方法、新进展及新期待

New method, progress and expectation of reclaiming used foundry sand

概述了现有旧砂再生方法的特点及其适用性,重点介绍了近年来国内外旧砂再生技术研究及应用的新方法、新进展,对这些新方法及特点进行了综合评价。未来铸造旧砂再生技术的发展趋势应该是:适于各类旧砂或混合旧砂的低成本再生回用工艺方法及设备的开发,以实现所有旧砂的合理再生和综合利用;干法(机械)再生相对简单,要重视热法、湿法、尤其是多种方法复合再生技术及装备的研发,应根据不同旧砂的性能特点采用不同的再生方法;热法再生的余热回用、水玻璃旧砂(碱酚醛树脂旧砂)再生的碱性物质回用、生物再生、超声波湿法再生、微波再生等新技术及应用,值得关注与期待。

The characteristics and applicability of the current reclamation method for used foundry sandhave been overviewed in the text. The new method and progress based on the research and applicationof reclaiming used foundry sand at home and abroad in recent years have been highlighted. These newmethods and characteristics have been comprehensively evaluated. The future development trend of usedfoundry sand reclamation technology should include： the development of low-cost reclamation and reusemethod and its equipment can be suitable for all kinds of used foundry sand or mixed used foundrysand in order to achieve reasonable reclamation and comprehensive utilization of all kinds of used sand;as the dry （mechanical） reclamation method is relatively simple, the research and development of thermalmethod, wet method, and the multiple composite reclamation method as well as the equipment should bepaid more attention; different reclamation method should be adopted according to the performance char-acteristics of different used sand; the new technologies and applications should be paid attention andexpectation, which include the reuse of waste heat from thermal reclamation process, alkaline materialsfrom reclaiming used sodium silicate sand or alkaline phenolic resin sand, biological reclamation method,ultrasonic wet reclamation method, and microwave reclamation method.