摘要
在CO2硬化水玻璃砂的化学再生试验中,使用了从同一车间不同时间取回的两种旧砂。将NaOH水溶液与旧砂混匀并密封,在室温下放置不同的时间进行制样,并测试性能。立即制样时,砂子发散,性能很差;放置一段时间,碱液慢慢渗入废旧水玻璃膜,使旧砂粘结性能得以恢复,即得到再生。放置2天左右时,再生砂性能较好,即时强度与新水玻璃砂相当,24h强度可恢复至新水玻璃砂的50%～60%,表面稳定性达80%～90%。另外,两次旧砂再生时需加入的NaOH量相差很多,主要是由于生产中吹气操作的不同使水玻璃反应率不同,从而使旧砂中可恢复的Na2O不同所致。所以,生产中使用化学再生时,再生方案不能根据水玻璃旧砂原始参数进行简单估算,而应根据生产情况随时进行调整。
Chemical reclamation of CO2 silicate sodium sand was studied through an experiment. After NaOH and water of moderate amount were added for two days, the old CO2 silicate sodium sand could be reclaimed. Immediate strength of reclaimed sand is commensurate to some new sand＇s, strength of 24 hours was about 50 to 60 percent of the new sand＇s, and surface stability could attain 80 to 90 percent. Two kinds of old sand which were got from the same workshop at different time needed different NaOH amount when they were reclaimed. The difference of two kinds of old sand was only that blowing operation was different. It is indicated that blowing operation affects the reclamation project directly and the project should be adjusted according to blowing operation at any time in production.
出处
《铸造》
EI
CAS
CSCD
北大核心
2006年第4期405-407,共3页
Foundry
关键词
水玻璃砂
二氧化碳
化学再生
silicate sodium sand
carbon dioxide
chemical reclamation
