湿型砂鲕化率检测方法的研究  

Study on Oolitization Rate Test Method of Used Sand

作　　者：殷亚军[1] 万鹏[1] 吴海军 刘睦坤 林鹏飞 计效园[1] 李远才[1] 周建新[1] YIN Ya-jun;WAN Peng;WU Hai-jun;LIU Mu-kun;LIN Peng-fei;JI Xiao-yuan;LI Yuan-cai;ZHOU Jian-xin(State Key Laboratory of Materials Processing and Die&Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,China;Huangshi Dongbei Casting Co.,Ltd.,Huangshi 435106,China)

机构地区：[1]华中科技大学材料成形与模具技术国家重点试验室,湖北武汉430074 [2]黄石东贝铸造有限公司,湖北黄石435106

出　　处：《现代铸铁》2023年第1期50-54,共5页Modern Cast Iron

基　　金：“两机”重大专项基础研究(2017-Ⅶ-0008-0102);国家重点研发计划“网络协同制造和智能工厂”(2020YFB1710100);国家自然科学基金(51905188);国家自然科学基金(51775205)。

摘　　要：采用磷酸法和盐酸-氢氧化钾法对湿型砂鲕化率进行了测量试验,并对其中的关键步骤进行了改进。试验结果表明:将加热方式改为随炉加热,可以避免试样表面出现焦炭膜;将煮沸工艺改为煮沸+搅拌工艺,可以使鲕化层去除更完全;将盐酸-磷酸法中的盐酸取消,简化为磷酸法,可以减小金属元素损失,使测量值更准确;将盐酸-氢氧化钾法的反应时间从25 min延长至30 min,可以解决砂粒未洗净的问题;使用少量盐酸滴入到沉淀与砂粒混合的溶液中,沉淀可以被有效去除,解决两者难以分离的问题。The oolitization rate of green molding sand was measured with phosphoric acid method and hydrochloric acid-potassium hydroxide method,and the their key steps was improved.The test results indicated that:the heating method being changed to the furnace heating,could avoid the coke film on the surface of the sample,changing the boiling process to the boiling+stirring process could make the oolitization layer removal more completely,simplifying the hydrochloric acid in the hydrochloric acid-phosphoric acid method to the phosphoric acid method could reduce the loss of metal elements and make the measurement value more accurate,extending the reaction time of the hydrochloric acid-potassium hydroxide method from 25 min to 30 min could solve the problem of sand grain being not washed.Adding a small amount of hydrochloric acid drops into the solution of the precipitate mixed with the sand particles,the precipitate could be effectively removed,solving the problem of difficult separation between the two.

关 键 词：湿型旧砂 鲕化率 磷酸法 盐酸-氢氧化钾法 

分 类 号：TG221[金属学及工艺—铸造]