有机物对铸造粘土废旧砂再生质量的影响研究

Study on the Influence of Organic Matter on the Reclamation Quality of Waste Clay-Bonded Sand

铸造粘土废旧砂通常采用高温焙烧结合机械摩擦方法进行再生回用,为了得到高质量的再生砂,废旧砂再生过程中要求焙烧温度相对精确和稳定,但粘土废旧砂中存在的煤粉及有机树脂砂壳芯混入的有机物使焙烧温度出现巨大波动,特别是细颗粒废旧砂中的有机物,影响再生砂质量和再生效率。本文首先将粘土废旧砂进行100目筛分分级,研究100目筛上和100目筛下两种粒级废旧砂中有机物对燃烧速率的影响,然后确立废旧砂中有机物燃值贡献的计算公式,并通过实际生产测试,获得有机物燃值贡献阀值和废旧砂的再生最优投入量,为粘土废旧砂的高效率和高质量再生提供理论参考。

High-temperature calcination combined with mechanical grinding method was usually adopted for recycling the foundry waste clay-bonded sand.In order to obtain high-quality reclaimed sand,the calcination temperature is required to be relatively accurate and stable in the reclamation process of waste sand.However,the calcination temperature fluctuates greatly due to the existence of organic matter,such as pulverized coal in the waste clay-bonded sand,especially the organic matter in the fine particle waste sand,which affects the quality and efficiency of the reclaimed sand.In this paper,the waste clay-bonded sand was firstly screened and graded with 100 mesh to investigate the influence of the organic matter in two types of the waste sand on the combustion rate,and then the calculation formula for the contribution of the organic matter in the waste sand was established.According to the actual production test,the contribution threshold of the fuel value of the organic matter and the optimal input of reclamation of the waste sand were obtained,which can provide a theoretical reference for the high-efficiency and high-quality reclamation of the waste clay-bonded sand.