共查询到17条相似文献,搜索用时 171 毫秒
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阐述了USR-Ⅱ强力摩擦砂处理再生机的结构特点和工作原理,利用改造后的砂处理系统对酯硬化碱性酚醛树脂旧砂进行处理,检测分析了再生砂性能。结果表明,运用USR-Ⅱ强力摩擦砂处理再生机的系统,可有效解决酯硬化碱性酚醛树脂砂的再生难题。 相似文献
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通过对酯硬化碱性酚醛树脂旧砂的模拟再生试验,分析了再生前后砂样的灼烧减量、发气量等性能的变化,以及对型砂强度的影响因素。结果表明:采用模拟再生工艺可使再生砂回收率达到95%左右;在再生砂中加入质量分数10%~20%的新砂,可明显提高再生砂的黏结强度,为更好运用酯硬化碱性酚醛树脂砂生产高强度钢种的铸件提供旧砂再生工艺方案。 相似文献
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根据铸钢件造型生产工艺的特点,通过合理的比较研究,提出以碱性酚醛树脂砂作为面砂、酯硬化水玻璃砂作为背砂的复合造型工艺,并在实际生产中取得成功,针对复合造型工艺设计的旧砂再生系统较好地解决了旧砂再生的难题. 相似文献
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酯硬化碱酚醛树脂砂旧砂多级再生技术探讨 总被引:1,自引:0,他引:1
根据酯硬化碱酚醛树脂砂旧砂的特点,在旧砂再生线上,采用了多级机械撞击再生,结果表明:L.O.I(灼烧碱量)达到1.3%左右,再生效果明显,与一般的再生设备(如气流冲击再生设备)比较,多级再生成套设备可靠、实用、经济。旧砂回用率高达85%,其再生成本远比新砂成本低的多。因此,经济上有较大效益,在环保方面和技术进步方面都具有前瞻性。 相似文献
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酯硬化水玻璃旧砂再生工艺方法的选择 总被引:4,自引:2,他引:2
根据酯硬化水玻璃旧砂的特征。本文介绍了该类旧砂干法再生和湿法再生的特点及工艺流程,阐述了它们的优,缺点,对酯硬化水玻璃旧砂再生工艺方法的选择阐述了作者的观点。 相似文献
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针对CO2水玻璃砂溃散性差、旧砂回收难,铸件清砂困难等问题,论述了改善CO2水玻璃砂溃散性和再生性的机理,从而研制了一种能够提高CO2水玻璃砂溃散性和再生性的添加剂.介绍了这种添加剂的基本材料、工艺、特点、对水玻璃砂的改性作用以及这种工艺在生产厂的应用情况. 相似文献
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该旧砂湿法再生系统将酯硬化水玻璃旧砂经落砂、磁选和破碎后,进行一、二级回转振动研磨湿法再生机,尔后经脱水、烘干、冷却处理获得再生砂.污水再生循环系统将旧砂再生系统产生的污水在搅拌泥浆泵中通过加入酸、混凝剂和絮凝剂等处理后,循环回用,分离出的污泥由压滤机处理成泥饼. 相似文献
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A lot of mixed clay-resin waste sand from large-scale iron foundries is discharged every day; so mixed waste sand reclamation in low cost and high quality has a great realistic significance. In the study to investigate the possibility of reusing two types of waste foundry sands, resin bonded sand and clay bonded sand which came from a Chinese casting factory, a new low-cost reclamation method of the mixed foundry waste sand based on the wet-thermal composite reclamation was proposed. The waste resin bonded sand was first reclaimed by a thermal method and the waste clay bonded sand was reclaimed by a wet method. Then, hot thermal reclaimed sand and the dehydrated wet reclaimed sand were mixed in certain proportions so that the hot thermal reclaimed sand dried the wet reclaimed sand leaving some water. The thermal reclamation efficiency of the waste resin bonded sand was researched at different heat levels. The optimized wet reclamation process of the waste clay bonded sand was achieved by investigating the effects of wet reclamation times, sand-water ratio and pH value on the reclaimed sand characteristics. The composite reclamation cost also was calculated. The research results showed that the properties of the mixed reclaimed sand can satisfy the application requirements of foundries; in which the temperature of the thermal reclamation waste resin bonded sand needs to be about 800 oC, the number of cycles of wet reclamation waste clay bonded sand should reach four to five, the optimal sand-water ratio of wet reclamation is around 1:1.5, and the pH value should be adjusted by adding acid. The mass ratio of hot thermal reclaimed sand to dehydrated wet reclaimed sand is about 1:2.5, and the composite reclaimed sand cost is around 100 yuan RMB per ton. 相似文献