Particle size terminology in solids handling When a particulate specification states “80% passing 200-mesh (about 74 μm)”, the material is commonly termed as what?

Introduction / Context:In mineral processing, powder technology, and process engineering, size descriptors are linked to standardized sieves (mesh) or micrometre ranges. Correct terminology helps in specifying feeders, classifiers, filters, and dust-control equipment.

Given Data / Assumptions:

• 200-mesh corresponds to about 74 micrometres opening.
• “80% passing” means the cumulative undersize is 80% at that cut.
• Application is in solids handling or milling specifications.

Concept / Approach:Material that is largely finer than 200-mesh is routinely referred to as a “powder.” Terms like “grit” and “aggregate” align with coarser fractions (sand, gravel, stone). “Smoke” refers to very fine aerosols/combustion particulates in air, not bulk solids passing sieves.

Step-by-Step Solution:

Verification / Alternative check:Industrial datasheets classify many milled products (cement, pigments, mineral fillers) as powders at similar or finer d50/d90 values, consistent with 80% passing 200-mesh.

Why Other Options Are Wrong:

• Smoke: airborne combustion aerosol; not a bulk solid sieve designation.
• Grit: coarser, often millimetre-scale particles.
• Aggregates: coarse construction materials (sand to gravel), far larger than 74 μm.

Common Pitfalls:Equating “dust” or “smoke” (airborne) with “powder” (bulk solid capable of being sieved).

Final Answer:Powder