
The benchmark 62% iron ore futures chart sourced from the COMEX showed prices have slumped about 34% year-to-date to trade below $80 per tonne, as of 1 November 2022. It was just over a year ago that iron ore prices had surged to an all-time high of about $220 per tonne in July 2021 on the back of a commodity supercycle narrative.

This document specifies the methods to be employed for determination of size distributions by sieving of iron ore and direct reduced iron (excluding briquetted iron), utilizing sieves having aperture sizes of 36 µm or larger. The size distribution is expressed in terms of mass and percentage mass, passed or retained on selected sieves.

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As-mined iron ore contains lumps of varying size, the biggest being more than 1 metre (40 inches) across and the smallest about 1 millimetre (0.04 inch). ... Crushed ore is divided into various fractions by passing it over sieves through which undersized material falls. In this way, lump or rubble ore (7 to 25 millimetres in size) is separated ...

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A powder can be separated into two or more size fractions by stacking the screens, thereby determining the powder's particle size distribution. Sieves and screens are usually used for larger particle sized materials, greater than 44 micron (325 Mesh). Two scales are used to classify particle sizes; US Sieve Series and Tyler Mesh Size.

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