脆化温度对粘土再生砂微粉去除率的影响

Effect of Brittle Temperature on Micro Powder Removal Ratio of Reclaimed Green Sand

对粘土砂再生前的脆化温度进行了试验研究,发现在相同的再生机和负压流化床工作参数下,对粘土砂进行烘干后再生所获再生砂的微粉去除率最低,经高温脆化后再生所获再生砂的微粉去除率最高。采用700℃高温脆化时,随保温时间的延长,再生砂的微粉去除率提高,当保温10min,然后再进行机械再生及去除微粉操作时,可以获得泥分含量低于同种新砂的再生砂,并且再生粘土砂的微粉去除率随再生次数的增加而提高。

Brittle temperature of green sand before reclamation was studied. When the work conditions of the reclaimer and vacuum fluidized bed are identical, the removal ratio of micro powder for the reclaimed sand by drying is the lowest and that by high temperature embrittlement is the highest. When embrittling at 700 ℃, the longer the holding time, the higher the removal ratio of micro powder of the reclaimed sand. With 10 min holding time, mechanically reclaiming and removing micro powder by vacuum fluidized bed, micro powder content of the reclaimed sand is lower than the new sand. The removal ratio of micro powder of the reclaimed sand increases with increasing reclamation times.