The tungsten acid method in the production of ammonium metatungstate smelting is a specific production process, mainly used to prepare ammonium metatungstate. The following is a detailed explanation of the tungsten acid method:
Raw materials and steps
Main raw materials: tungstic acid and ammonia water.
Steps: First, dissolve tungstic acid with ammonia water, and then add it to boiling deionized water. Heat the ammonia under stirring to make the pH value of the solution reach 8.
Reaction process
When the solution is boiling, add acetic acid, and then adjust the pH value to 2-4 with dilute nitric acid.
Continue to heat and concentrate to a relative density of 1.5-2, then stop heating.
Subsequent treatment
Cool and filter to obtain a filtrate.
Add ethanol to the filtrate and stir it thoroughly, filter it after sedimentation.
Dry and crush the obtained crystals at 80°C to obtain ammonium metatungstate products.
Features
The tungsten acid method is a method for preparing ammonium metatungstate by directly reacting tungstic acid and ammonia water.
This method is relatively simple, but requires precise control of pH value and heating conditions to ensure the purity and quality of the product.
In summary, the tungstic acid method in the smelting production of ammonium metatungstate is a method for preparing ammonium metatungstate by reacting tungstic acid and ammonia water, heating, adjusting pH value, concentrating, filtering and drying.
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