Strengthening granulation behavior of specularite concentrates based on matching of characteristics of iron ores in sintering process

Recycling of Waste V2O5–WO3/TiO2 Catalysts in the Iron Ore Sintering Process Via a Preballing Approach

“…It is generally believed that better granulation performances of a sintering mixture can contribute to higher permeability of green feed and increase sintering permeability, which could improve the fuel combustion efficiency and afford excellent sinter products. , Therefore, the UI and JUP parameters are used to evaluate the degree of concentrated distribution and permeability of the sintering mixture after granulation. The higher these values, the better the permeability of the sintering layer would be …”

“…After granulation, ∼1 kg granules were taken to evaluate the granulation performance by measuring the particle size distribution, uniformity index (UI), and Japanese Permeability Unit (JPU). 30,31 The granules were frozen quickly using liquid nitrogen, and the frozen particles were screened into six size fractions (>8, 8−5, 5−3, 3−1, 1−0.5, <0.5 mm). The UI and JPU were calculated as follows…”

“…Then, the mixture was loaded into a roller granulator to granulate the fine-grained materials into granules, with a moisture content controlled at 7.0%. After granulation, ∼1 kg granules were taken to evaluate the granulation performance by measuring the particle size distribution, uniformity index (UI), and Japanese Permeability Unit (JPU). , The granules were frozen quickly using liquid nitrogen, and the frozen particles were screened into six size fractions (>8, 8–5, 5–3, 3–1, 1–0.5, <0.5 mm). The UI and JPU were calculated as follows where m 3–8 represents the mass of the particles of size 3–8 mm, g; m T represents the total weight of the sample, g; Q is the airflow rate, m 3 ·min –1 ; A is the cross-sectional area of the sintering material charging bed, m 2 ; H is the bed height, mm; and Δ P is the pressure drop across the bed, mm H 2 O.…”

Granulation Behavior of an Iron Ore Sintering Mixture Containing High Grade Pellet Feed with Different Specific Surface

“…Vinícius de Morais OLIVEIRA, 1) * Alei Leite Alcantara DOMINGUES, 1) Mauricio Covcevich BAGATINI 2) and Valdirene Gonzaga de RESENDE 1) 1) Ferrous Technology Center, Vale S.A., Nova Lima, MG, Brazil. High-grade iron ores became more attractive due to the searching for lower slag rate operation in blast furnaces aiming to reduce CO 2 emissions as the environmental regulation became even more restricted.…”

“…Recently, due to the increase of fine portion of the sinter feeds and also the availability of concentrates, such as pellet feeds, this step played an important role to guarantee good permeability conditions for sintering process. 1,2) Granulation is the term used to name the process of increasing particle size to a certain optimal size with spherical shape by using fine and very fine particles. According to Walker 3) the granulation happens when a bed of solid particles moves with simultaneous intensive mixing in the presence of a liquid phase.…”