To avoid precipitation of ammonium metatungstate dispersion, it can be controlled and optimized in the following aspects:
- Control the pH value of material liquid
Select the appropriate pH range
Experiments show that in the range of pH1.0~2.4, with the increase of material liquid pH, the more stable the material liquid is. Therefore, when preparing ammonium metatungstate dispersion, a suitable pH value, such as pH1.6, should be selected to ensure its stability.
Stabilization of pH value
During preparation and use, the pH value of the solution should be continuously monitored and adjusted to prevent it from fluctuating too much. Especially when the volume of the solution decreases due to evaporation, the pH should be adjusted in time with an alkaline solution such as ammonia to keep it stable.
- Control temperature
Avoid too high or too low temperature
Temperature is an important factor affecting the stability of ammonium metatungstate. Exposure of the dispersion to too high or too low temperature should be avoided to prevent it from crystallization or other unfavorable changes to the stability.
Maintaining a constant temperature
During preparation and use, the temperature should be kept as constant as possible to avoid temperature fluctuations that adversely affect the stability of the dispersion.
- Stirring and mixing
Adequate mixing
During preparation and use, the dispersion should be stirred thoroughly to ensure its homogeneity and stability. Stirring can prevent the local concentration from being too high or too low, thus reducing the generation of precipitation.
Homogeneous mixing
When adding other chemicals or solvents, make sure they are well mixed with ammonium metatungstate to avoid local reaction or precipitation.
- Storage conditions
Sealed storage
Store ammonium metatungstate dispersion in well-closed containers to prevent it from absorbing moisture in the air or being otherwise contaminated.
Protect from light and heat
Place the dispersion in a cool, dry and light-proof place to avoid direct sunlight and high-temperature environments that may adversely affect its stability.
- Monitoring and Testing
Regular testing
Regularly test the ammonium metatungstate dispersion, including its pH value, concentration, stability and other indexes, in order to find out the problems and take measures to solve them.
Observation of precipitation
In the process of use, the dispersing solution should be closely observed whether precipitation occurs. Once precipitation is found, stop using it immediately and find out the reason.
- Other Precautions
Avoid coexistence with other chemicals
In the process of preparation and use, coexistence of ammonium metatungstate dispersion with chemical substances that may react with it should be avoided to prevent the production of precipitation or other substances unfavorable to stability.
Optimization of preparation process
The stability and quality of ammonium metatungstate dispersion can be improved by optimizing the preparation process and conditions, such as choosing suitable solvents, controlling the reaction temperature and time.
In summary, avoiding the precipitation of ammonium metatungstate dispersion needs to be comprehensively controlled and optimized from many aspects. The stability and quality of ammonium metatungstate dispersion can be effectively improved by controlling the pH value, temperature, stirring and mixing, storage conditions, and monitoring and testing.
More details of ammonium metatungstate product, please visit website: http://ammonium-metatungstate.com/
Please contact CHINATUNGSTEN for inquiry and order of ammonium metatungstate:
Email: sales@chinatungsten.com
Tel.: 86 592 5129595
