Silicotungstic Acid Producing Processes

Producing processes of silicotungstic acid are as follows:
1. Making 1000g hydrated sodium tungstate dissolved in 2000mL water.
2. Adding 75g water glass into the solution and the solution was stirred violently with a motor stirrer and heated to boil. At the same time, using a separatory funnel adds 600mL concentrated hydrochloric acid with dropwise.
3. Filtered off a small amount precipitate of silicic acid and cool the mixture. Then add 400mLconcentrated hydrochloric acid and cool the solution.
4. Extract by little excess ether which is washed with dilute sodium hydroxide solution. First, putting ether complex into a suction flask, washed air drawn into this mixture to blown off ether quickly, at the same time the mixture was heated on a hot pan. Continue this process until the upper edge liquid appears crystals. Then, the solution was left to be slowly crystallized, or the solution was evaporated to dryness. The complex was re-dissolved in water and then evaporated to dryness. Continue to repeat this operation until the product had no odor of volatile acids.
5. When fully dried, pulverized acid in a mortar and drying to constant weight at 70℃.

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