Dried silicate solutions metasilicates

A solution of about 1% sodium silicate is prepared and, after filtering, precipitated by adding 2% BaClg solution with stirring the BaCls should be in 10% excess. The precipitate is dried by suction and then on a water bath. This yields the disilicate. The metasilicate is formed if NaOH is added to the silicate solution before precipitation so that there are fifteen moles of base to one mole of SiOg. This is dried in the same manner as above. 

Drying a solution of metasilicate in a special drum granulator drier is commonly used in industry (see Table 22.1) [15,79,80]. The aqueous sodium silicate solution is prepared from alkaline sodium silicate liquor and caustic soda (see Figure 22.9). 

Data per 1 t of Product Sodium Silicate Furnace Lumps Sodium Silicate Furnace Liquor Hydrothermal Sodium Silicate Solution Spray-Dried Sodium Silicate Powder" Sodium Metasilicate Pentahydrate Layered Sodium Disilicate ... 

The monohydrate of the metasilicate, LiaSiC HjO, is obtained as an almost insoluble, white, granular precipitate by the interaction at 80° to 90° C. of a solution of sodium metasilicate and the equivalent amount of lithium chloride in presence of normal lithium hydroxide. It is also produced by dissolving silicic acid dried below 100° C. in twice the theoretical proportion of twice-normal lithium hydroxide at the ordinary temperature, and subsequently heating the solution to 80° C. A readily soluble modification has also been prepared.1... 

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