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Low-grade iron ore powders with particle sizes less than 1.0 mm are becoming more frequently used as feedstock for blast furnaces owing to the depletion of high-grade iron ore.1) However, low-grade powder is generally unsuitable as a feedstock owing to its tendency to scatter and clog the blast furnace with the application of a reducing gas. As a result, low-grade powders are often agglomerated or sintered to prevent this scattering. The sintering of powdered ores is usually performed by homogeneous mixing of the fine iron ores with auxiliary materials, such as limestone and coke, and heating of the mixture at ca. 1 300 K for several minutes. The materials produced, termed “sintered ores,” have sufficient physical strength to resist the high pressures and temperatures experienced in a blast furnace. At present, sintered ores account for ca. 80% of the raw materials used in iron manufacture.2–4) Iron manufacture requires an enormous amount of energy because of the need for high temperature and pressure. In addition, the process exhausts large quantities of carbon dioxide because carbon monoxide is often used to reduce the ferric oxide in the iron ore. The amount of carbon dioxide Crystalline Phase Quantitation of Sintered Ore with Powder X-ray Diffractometry with Rietveld Refinement