用蒙脱土酸处理法制备洗用4A沸石过程中石英问题的探讨

目前我国洗涤剂用４Ａ沸石实现半工业化的是采用以水玻璃、氢氧化铝为起始原料的全合成法1]，以该法生产沸石的产品质量较稳定，但生产成本较高。而以蒙脱土为原料的合成４Ａ沸石，生产成本可以大大降低［２－４］，但是蒙脱土中往往含有石英杂质，如果不设法去除，必将影响产品的纯度，使其质量指标（白度、粒度、钙离子交换量）难以达到洗涤剂行业标准［５］，而且洗衣粉中含有石英也会磨损衣物。 本文将重点讨论石英这一问题，包括如何测定石英杂质含量和如何在用蒙脱土生产洗涤剂用４Ａ沸石过程中去除石英杂质。１实验部分１．１实验样…

The Discussing of Quartz Problem in the Synthesis of Detergent-Used Zeolite 4A from Montmorillonite

Zeolite 4A is the main substitute builders for sodium tripolyphosphate in non-phosphated detergent. It can be manufactured from savageness clay and the cost may greatly be reduced by this method. In the manufacturing process of detergent-used zeolite 4A from montmorillonite, it is important to remove quartz from clay or zeolite, otherwise the product will not qualified for detergent additive. This article provides two methods, the calibration curve method of quartz content by XRD and the calibration curve method of aluminium ion concentration in synthetic system, to determine the quartz content. Then three methods of removing quartz were studied on, including the methods of whirlwind during the mill run, filtration after alkalinization of silicic acid gel and sedimentation of zeolite.