铸造混合型旧砂的复合再生工艺研究  

Research on the Composite Reclamation Technology of Clay Resin Mixed Foundry Waste Sands

作　　者：韩海涛 韩继磊 王大威 刘宁 李宝娥 师春生[2,4] 李海鹏 HAN Hai-tao;HAN Ji-lei;WANG Da-wei;LIU Ning;LI Bao-e;SHI Chun-sheng;LI Hai-peng(Chengde Beiyan New Material Technology Co.,Ltd.,Chengde 068451,Hebei,China;Technology Innovation Center of Silica Sand of Hebei Province,Chengde 068451,Hebei,China;School of Material Science and Engineering,Hebei University of Technology,Tianjin 300130,China;School of Material Science and Engineering,Tianjin University,Tianjin 300350,China)

机构地区：[1]承德北雁新材料科技有限公司,河北承德068451 [2]河北省硅砂材料技术创新中心,河北承德068451 [3]河北工业大学材料科学与工程学院,天津300130 [4]天津大学材料科学与工程学院,天津300350

出　　处：《铸造》2024年第6期799-803,共5页Foundry

基　　金：河北省铸造废砂再生循环利用创新团队项目(225A7601D)。

摘　　要：对含不同类型树脂芯砂的粘土混合旧砂进行再生试验研究,对比了湿法再生、化学再生和复合再生等对再生砂表面形貌和性能的影响。结果表明:单一再生方法无法同时满足对含泥量、灼减量、酸耗值等要求。“水洗+碱/酸处理+高温焙烧”工艺能充分发挥不同工艺优势,获得理想结果,适宜的工艺参数为在400 r/min的转速下水洗6次,每次5 min,砂水比约为1.7∶1,并在水洗初期和水洗后每100 g旧砂依次加入0.1 mol/L的氢氧化钠溶液4 mL和草酸溶液6 mL,最后将水洗后的砂子在700℃焙烧15 min。再生砂含泥量、酸耗值、灼减量分别达到0.18%,2.61 mL和0.08%,均超过行业标准和企业生产要求。In this paper,the reclamation of different clay resin mixed waste sands were investigated.A composite reclamation method was proposed to reclaim these sands,as compared to water scrubbing reclamation method.The surface morphology and properties of the reclaimed sands were studied.The results show that the process route of“water scrubbing+alkali liquor soaking/acid liquor soaking+roasting”was appropriate,which could combine the advantages of different methods and lead to an ideal result.In details,the waste sands have been water washing six times with a speed of 400 r/min,and each duration time is 5 min.At the initial scrubbing,4 ml alkali liquor was added with concentration of 0.1 mol/L,while 6 ml acid with the same concentration was added when after scrubbing.Finally,the modified sands were roasted at 700℃ for 15 min and cooled to room temperature.The mud content,acid consumption value,loss on ignition are 0.18%,2.61 mL and 0.08%,respectively,which meet the industry standard and customer requirements.

关 键 词：粘土混合旧砂 复合再生 微观形貌 工艺性能 

分 类 号：TG221[金属学及工艺—铸造]