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MPS stands for Mean Particle Size and it's a crucial parameter for iron ore pellets. It refers to the average diameter of the pellets in a sample. The unit for MPS can vary depending on the context, but the most common ones are:
Millimeters (mm): This is the most common unit used in international trade and technical specifications. A typical MPS range for iron ore pellets is 5-20 mm.
Inches (in): Used in some regions like the United States. To convert from millimeters to inches, multiply by 0.03937.
Microns (μm): Mainly used for very fine powders. To convert from millimeters to microns, multiply by 1000.
The MPS of iron ore pellets is important for several reasons:
Packing density: Larger MPS pellets have a lower packing density, which allows for better air flow in blast furnaces and direct reduction processes.
Porosity: Larger MPS pellets tend to be more porous, which improves their reducibility (converting iron oxide to metallic iron).
Strength: Smaller MPS pellets can be weaker and more prone to breakage during handling and transportation.
PMD & MPS Difference
PMD stands for Pellet Size Distribution. It's a measure of the range of sizes present in a sample of iron ore pellets. While MPS provides an average, PMD describes the entire distribution of pellet sizes. PMD is typically expressed as a standard deviation (SD) around the MPS. For example, an MPS of 10 mm with a PMD of 2 mm would indicate that most pellets are between 8 mm and 12 mm in diameter.
The key difference between MPS and PMD is:
MPS: Average diameter of the pellets in a sample.
PMD: Range of sizes present in a sample.
A good MPS and PMD range depends on the specific application of the iron ore pellets. For example, blast furnaces may prefer larger MPS pellets with moderate PMD, while direct reduction processes may favor smaller MPS pellets with tighter PMD control.
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