Pellet quality is a critical aspect of many industrial processes, especially in laboratory settings where accuracy and consistency are paramount.
5 Key Factors to Consider
1. Particle Size
The particle size of the sample is critical for pellet quality.
Ideally, the sample should be ground to a size of less than 50µm.
Smaller particles ensure better compression and binding, reducing heterogeneity in the sample.
Heterogeneities can affect the accuracy of elemental analysis, especially for elements with shallow sampling depths like sodium.
2. Moisture Content
The moisture content of the feedstock must be within an optimal range specific to the material being processed.
Incorrect moisture levels may require drying or additional processing to achieve the desired pellet quality.
3. Uniformity of Feedstock
Uniformity in particle size distribution and moisture content is essential for producing high-quality pellets.
While a slight variance in particle size can be beneficial for pellet strength, significant variations can lead to inconsistencies in the final product.
4. Binder Choice
The choice of binder is crucial in the pelletizing process.
A suitable binder, such as a cellulose/wax mixture, helps in binding the powders together, preventing contamination and ensuring accurate spectrometer results.
5. Process Variables
Variables such as binder spray rate, feed rate, disc speed, disc angle, and plow/scraper positioning can be adjusted to refine product characteristics and increase yield.
These adjustments must be made systematically to avoid undesirable effects on the product.
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