Powder fluidity test - powder properties analysis solution - Database & Sql Blog Articles

Powder fluidity test

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Powder characterization solution

First, the characteristics of powder representation

The intelligent powder tester is a comprehensive instrument used to analyze the physical properties of powders. It helps address common issues that occur during processing, storage, transportation, and in silos within the powder industry. Understanding these characteristics is essential for optimizing performance and preventing operational problems.

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The structure of the rat hole; if the compression arch is subjected to the pressure of the silo, the consolidation strength increases to cause arching; the arch-shaped materials interlock at the orifice bridge; the adhesive adheres to the arch moisture, and electrostatic adsorption enhances the adhesion between the powder and the silo wall, leading to arching; air pressure balance arch: if the unloading device is not well sealed, air leaks from the bottom into the chamber, balancing the upper and lower air pressure of the material layer; friction between the material and the solid walls occurs in the storage and delivery system of the powder material; in the design of the hopper, factors such as the size of the discharge opening, the inclination angle of the hopper wall, and the pressure of the powder on the hopper wall can lead to significant challenges if not properly designed.

The different industry properties of the second powder

In the production process of metallurgical and non-metallic bulk materials like powder metallurgy, food, pharmaceuticals, metals, chemicals, and agriculture, the flow of particulate matter is widely involved. This includes silo unloading, transport, mixing, fluidization, and solidification.

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Gas separation, among other processes, makes it crucial to analyze the flow characteristics of particulate materials to prevent clogging and ensure the uniformity and consistency of the components.

Third, the analysis methods commonly used in powder flow characterization

There are various analytical methods for characterizing powder flow. Based on commonly used generalized approaches, we can classify them into four categories: traditional quantitative methods, shear methods, tumbling methods, and yield stress methods. Each method has its own features and applications, which will be discussed in detail below:

3.1. Traditional quantitative methods

This method is currently the most widely used and one of the simplest and most intuitive measurement techniques. It primarily evaluates powder using the Karl index, with measurement items including tap density, bulk density, angle of repose (item angle), wiper angle (flat plate angle), collapse angle, difference angle, mass flow rate, volume flow rate, dispersion, void ratio, and more. These metrics help comprehensively assess the flow condition of the material through the Karl index and Hausnaby index.

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However, these test items do not provide an accurate analysis of the intrinsic properties of the powder. The results can vary significantly depending on the testing conditions, making them less reliable for in-depth analysis. That said, they are suitable for quick assessments and quality checks in certain departments, where the data obtained is limited but still useful for initial evaluations.

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