工业用硅酸钠和硅酸钾 沸腾水中难溶物的溶液制备和水不溶物的含量的测定

[中文适用范围]： 本方法适用于通式M2O对应的产品。 xSiO2，其中对于硅酸钠，x 值介于 1,5 和 3,5 之间；对于硅酸钾，x 值介于 1,9 和 3,9 之间。 由于溶解这些产品的细颗粒遇到困难，因此首先对样品进行筛分以除去这些细颗粒。 该程序包括通过高压釜处理将测试部分溶解在不含二氧化碳的水中。 在称皮重的过滤坩埚上过滤并称重不溶物。 将滤液稀释至给定体积，从中取出等分样品以进行不同的测定。 [外文原描述]： The method is applicable to products corresponding to the general formula M2O . xSiO2, where the values of x lie between 1,5 and 3,5 in the case of sodium silicates and 1,9 and 3,9 in the case of potassium silicates. Because of the difficulty ancountered in dissolving fine particles of these products, the sample is first sieved to remove these fines. The procedure consists in dissolution of the test portion in carbon dioxide-free water, by treatment in an autoclave. Filtration and weighing of the insoluble matter on a tared filter crucible. Dilution of the filtrate to a given volume, from which aliquot samples are taken in order to carry out the different determinations.