NaY母液回收与利用技术探讨

The Recovery and Utilization Technology of NaY Mother Liquid

主要介绍了利用NaY(或NaX)母液和硫酸铝反应制备出硅铝胶,并用于合成NaY分子筛的原理及工业生产应用。考察分析了硅铝胶制备过程中的几个重要影响因素,重点研究了硅铝胶加入量及母液和硅铝胶的放置时间对NaY质量的影响。研究结果表明:硅铝胶反应pH值不同,凝胶速度不同,原料的利用率也不同;硅铝胶加入量在15%～45%之间时,对NaY质量影响不大,进一步提高硅铝胶的比例时,因硅铝胶中含有的铝已经超过了NaY成胶配方中所需的铝量,无法使用;母液放置时间较长时,由于形成其他晶型,回收利用后对NaY质量影响严重。

This paper mainly introduced the theory and application in industrial production using NaY （ or NaX ） mother liquor and aluminum sulfate reaction for the preparation of a silica gel, which is used in the synthesis of NaY molecular. It analysed several important influence factors of the silica gel preparati on process , and focused on the silica gel dosage and the mother liquor and silica gel placement time effect on quality of NaY. Research results showed that： when the silica gel reaction pH value was different, gel speed was different , and the utilization rate of the raw material was also different; when silica gel contents of 15 % - 45% , it had little effect on NaY quality , further improving the silica alumina ratio, it couldnt be used because the silica gel containing aluminum had surpassed NaY gel formulation for the aluminum amount ; the mother liquor, which placed a long time,would have serious influence on NaY quality after recycling, duing to the formation of other polymorphs.