12/5/2023 0 Comments Black oolite sand![]() ![]() However, a large number of high phosphorus iron ore has not been used. ![]() There are about 4 billion to 5 billion tons of reserves in China, about 14 billion tons of reserves in Europe, and corresponding resources have been reported in the United States, Egypt and other countries. Oolitic hematite is an important potential iron ore resource. In order to support the rapid growth of steel output, the amount of iron ore, the main raw material of iron making, must also increase rapidly. ![]() įrom 2008 to 2018, China's iron and steel industry continued to increase its iron ore external dependence, reaching more than 60%. Some are refractory iron ores with granularity of less than 2 μm, resulting in difficulty in their separation. Apatite crystals, mainly in pillar, acicular, or aggregated shapes or in the form of dispersed particles, are embedded in iron minerals and gangue minerals, and are characterised by their fine granularity. In addition, these minerals are often attached to the edge of iron oxide mineral particles, or are embedded in quartz or carbonate minerals, with a small amount of iron minerals in the lattice of iron minerals. The phosphorus in the former type mainly exists in the form of apatite, whereas that in the latter type mainly exists in the form of oolitic collophanite, and a close relationship can be found between these minerals and iron minerals. These phosphorus-containing weakly magnetic iron ores can be divided into hydrothermal iron ores and sedimentary iron ores. Major producing areas of high-phosphorus oolitic iron ore are distributed in North America, Northern Europe, Australia, Saudi Arabia, and the Yangtze River region in China. During the process of mineralisation, hematite-limonite, quartz, and clay gangue minerals are generally wrapped in irregular shell-like layers from the centre of the oolite, forming a multi-layered structure, where no obvious boundary exists between the iron mineral layers and gangue layers, but there is a transitional distribution, in addition to the fine dissemination of grains of the iron mineral and gangue minerals in such iron ores.With the degree of dissociation of iron mineral monomers of 85%, the common diameter of mineral particles is up to about 20 μm, which has been beyond the ability of current beneficiation equipment, and has led to difficulty in the separation of oolitic hematite. Oolitic hematite, as its name suggests, is characterised by its oolitic structure, leading to the fine dissemination of grains. Oolitic hematite generally forms large sedimentary iron ore deposits, such as those in the underground iron mines of France (Lorraine), and in the United States (Clinton). Upgrading iron and removing phosphorus from the high-phosphorus oolitic iron ore will be difficult by physical beneficiation. The iron-bearing minerals in the oolite are mainly hematite, limonite, chlorite, and collophanite, and a close relationship between the hematite-limonite in the oolites and the iron-containing chamoisite can be observed. The iron concentrate consists of iron-rich oolite and some hematite. Specifically, the ooids consists of oolite nuclei, collophanite girdles, and hematite and limonite girdles the detritus is composed of fine-grained hematite and quartz feldspar and cement is composed of carbonate minerals and worm-like hematite. The results show that the high-phosphorus oolitic iron ore is a chemical sedimentary iron ore, mainly composed of oolite (more than 60%). The chemical composition, mineral composition, structure characteristics, dissemination characteristics, and iron and phosphorus occurrence state were carried out to investigate the mineralogical characteristics of the high-phosphorus oolitic iron. In this study, a high-phosphorus oolitic iron ore containing 44.70% Fe and 1.56% P from western Hubei of China was collected as the sample.
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