酯硬化水玻璃砂的特征与除尘系统设计

Characterization of Ester Cured Sodium Silicates Sand and Design of Dust Removal System

针对酯硬化水玻璃砂混砂造型工序中,水玻璃(Na2O.mSiO2.nH2O)与有机酯固化剂(R-COOR')作用,生成有机酸钠(R-COONa)、有机醇(R'-OH)、硅溶胶(mSiO2.nH2O),进而在浇铸及焙烧过程中,大部分分解为氧化钠(Na2O)和石英(SiO2)残留在旧砂中,非常容易引起滤袋堵塞,对除尘系统的运行及运行效果产生一些不利的影响。采取了一系列对策措施,并经一些项目除尘系统的运行及运行效果验证,这些对策与措施能满足实际应用的要求。

The sodium silicate （N2O· mSiO2 · nH2O） reacts with organic ester hardener （R- COOR ＇） and produces organic sodium （ R - COONa）, organic alcohol （ R＇- OH ）, and sol - silicate （ mSi02 ~ nH2O） in the ester cured sodium silicate sand modeling process. Then in the casting and the roasting process, most of the decomposition of sodium oxide （ Na2O） and quartz （ SiO2 ） left in the sand. The bag is very prone to dogging and has some negative effects to the removal operation of the system and operating results. To this end, using a series of countermeasures, the dust removal system was identified by a number of projects running and operating results of the validation of these measures and found that the measures could meet the requirements of practical application.