# Effective way of slurry sampling

• Rachit
In summary, the agitator is not effectively reaching the bottom of the reactor which is causing significant analysis deviations in the two samples taken. There is no way to get a representative sample due to safety concerns. The original mass of pure water is known and there is no correlation or formula to check if the sample is representative of the slurry mass.
Rachit
I have ~50% slurry mass in a reactor with (4 PBT + 4PBT) agitator. Agitator is rotating at 94 RPM.
To analyze reaction mass we are sending two samples at a time from bottom of the reactor. There is significant analysis deviations in these two samples. I feel that the sample is not representative of the reaction mass.
Is there any way to get representative sample in slurry mass or any advanced sampling technique that can help?
Also is there any calculation/ relations to check if sample is representative of the slurry mass or not?

Welcome, Rachit!

Are the agitators effectively reaching and moving the whole volume contained in the tank?
If not reaching the bottom, could you stop the rotating parts and take samples from a higher and mid-radius point?
Can you precisely calculate the original mass of pure water in the mix?

Just a few ideas.

Rachit
Lnewqban said:
Welcome, Rachit!

Are the agitators effectively reaching and moving the whole volume contained in the tank?
If not reaching the bottom, could you stop the rotating parts and take samples from a higher and mid-radius point?
Can you precisely calculate the original mass of pure water in the mix?

Just a few ideas.
You can say that the agitator reaches upto 96% of the reactor height( or depth).

Sampling from different points of the mix is not possible due to safety concerns.

The original mass of pure water is known (precisely).

Now, is there any correlation or formula to check settling velocity in a pipe placed at an angle from vertical

There are so many variables involved in slurry settling that formulas are impractical. For example, precipitated calcium carbonate settles completely differently than ground calcium carbonate with the same particle size. A lesson that a certain agitator manufacturer learned the hard (expensive) way.

An agitator sized for complete mixing is more powerful than an agitator sized for off bottom suspension. If your agitation system (agitator, impeller, tank shape, baffles) is sized for anything less than complete mixing, there will be variations in concentration. Those variations would show as concentration differences between successive samples.

Does your sample system allow the slurry to settle in the pipe immediately before the sample valve? If so, are you letting it flow before capturing the sample?

Rachit, Astronuc, Lnewqban and 1 other person

## 1. What is slurry sampling and why is it important in scientific research?

Slurry sampling is a technique used to collect and analyze samples of a mixture of solid particles and liquid. It is important in scientific research because it allows for the accurate and representative analysis of heterogeneous samples, which is crucial for understanding complex systems and processes.

## 2. What are the key factors that determine the effectiveness of slurry sampling?

The effectiveness of slurry sampling depends on several factors, including the composition and properties of the slurry, the sampling method used, and the equipment and techniques employed for sample collection and analysis.

## 3. How can one ensure the accuracy and reliability of slurry sampling results?

To ensure accurate and reliable results, it is important to carefully select and prepare the sampling equipment, follow standardized sampling protocols, and properly analyze the collected samples using appropriate techniques and quality control measures.

## 4. Are there any limitations or challenges associated with slurry sampling?

Yes, there are some limitations and challenges associated with slurry sampling, such as the potential for sample heterogeneity, difficulties in sample preservation and storage, and the need for specialized equipment and expertise.

## 5. What are some common applications of slurry sampling in scientific research?

Slurry sampling is commonly used in various fields of scientific research, including environmental monitoring, mineral processing, pharmaceutical development, and food and beverage analysis. It is also widely used in industrial processes for quality control and process optimization.

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