iron processing - Ores | Britannica
Pure magnetite contains 72.4 percent iron, hematite 69.9 percent, limonite 59.8 percent, and siderite. China, Brazil, Australia, Russia, and Ukraine are the five biggest producers of iron ore, but significant amounts are also mined in India, the United States, Canada, and Brazil, Australia, Canada, and India export the most, although Sweden, Liberia Sintering machines are usually measured by hearth area; the biggest machines are 5...