The reagent requirements for the preparation of Ammonium Metatungstate mainly include the following aspects:
Main reagents
Ammonium paratungstate (APT)
As the main raw material for the preparation of ammonium metatungstate, its purity and quality have a direct impact on the quality of the final product. Therefore, ammonium paratungstate with high purity and low impurity should be selected.
Nitric acid
As the key reagent in the neutralization method, it is used to convert ammonium paratungstate into ammonium metatungstate. The concentration and quality of nitric acid have important influence on the reaction speed and the purity of the product. Usually dilute nitric acid is used, and the specific concentration should be determined according to the production process and equipment conditions.
Auxiliary reagents
Deionized water
Used for preparing slurry and washing products to remove impurities and unreacted raw materials. The deionized water should be pure to avoid the introduction of new impurities.
Ammonium Citrate
Used as a co-solvent to adjust the viscosity and stability of the slurry. The amount of ammonium citrate added should be determined according to specific process conditions.
Reagent requirements
Purity requirements
The purity of the main reagents and auxiliary reagents should be as high as possible to reduce the impact of impurities on product quality. Especially the main raw material, ammonium paratungstate, its purity should meet the requirements of industrial production.
Quality stability
The reagents should have good quality stability to avoid deterioration or pollution during storage and use.
Safety
The reagent should comply with the relevant safety standards to avoid harming the human body and the environment. In the process of use, safety operation procedures should be strictly observed to ensure the safety of personnel and equipment.
Specific values and information
Nitric acid concentration
Usually 3%～5% dilute nitric acid is used for neutralization reaction. The specific concentration needs to be determined according to the production process and equipment conditions.
Slurry concentration
The concentration of WO₃ in the slurry should be controlled in the range of 12% to 30% to ensure the smooth progress of the reaction and the purity of the product.
Solid-liquid ratio
The solid-liquid ratio should be controlled within the range of 1: (3～4) to ensure the uniformity of the reaction and the purity of the product.
Reaction temperature and time
The reaction temperature is usually controlled at 80～90℃ and the reaction time is about 4 hours. The specific temperature and time need to be adjusted according to the production process and equipment conditions.
In summary, the reagent requirements for the preparation of ammonium metatungstate include selecting raw materials and auxiliary reagents with high purity and stable quality, ensuring the safety of the reagents, and following the specific process conditions for operation.
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