Furan Sand Reclamation Recipe
呋喃树脂砂旧砂再生与回用配方
标签：旧砂再生, 呋喃树脂, 灼减量, 成本
呋喃树脂砂旧砂经「机械再生（脱膜率 85%）+ 风选除微粉」后可回用 90% 以上。控制指标：灼减量 <3%、微粉 (<0.075 mm) 含量 <0.5%、酸耗值 <5 mL；超标时补充 10–20% 新砂并在混砂时将树脂加入量从 1.2% 降到 0.9% 试验适配。再生砂型抗拉强度比新砂低 5–8%，大件浇注前需延长硬化时间 20–30 min。吨铸件砂耗成本可降 60%。
Furan sand is 90% reclaimable after mechanical attrition (85% coating removal) plus air classification. Control: LOI <3%, fines (<0.075 mm) <0.5%, acid demand <5 mL; if exceeded, blend 10–20% new sand and trial resin at 0.9% instead of 1.2%. Reclaimed sand strength runs 5–8% lower—extend hardening 20–30 min for heavy castings. Sand cost per tonne of castings drops about 60%. ---