Air that has been heated to around 1,200 degrees Celsius is injected into the furnace, creating a flame temperature of 2,000 degrees. This converts the iron ore to molten pig iron and slag.
Then, impurities are removed and alloying elements are added. The steel is then cast, cooled and rolled for use in finished products.
Our Western Australia Iron Ore business in the Pilbara region of Western Australia contains five mines, four processing hubs and two port facilities, all of which are connected by more than 1,000 kilometres of rail infrastructure.
Most of the iron minerals in a single magnetite are magnetite. Because the single magnetite is simple in composition, strong in magnetism, and easy to grind and sort, the weak magnetic separation method is often used for selection.
When the particle size of grinding is greater than 0.2mm, most iron ore magnetic separation plants often adopt a process of grinding and magnetic separation; When the grinding particle size is less than 0.2mm, the two-stage grinding-magnetic separation process is used; If qualified tailings are separated in the rough grinding stage, the magnetite magnetic separation plant should adopt the stage grinding-magnetic separation process; For dry and water-scarce areas, the magnetite ore dressing plant may consider using dry grinding-dry magnetic separation process; For the depleted magnetite-rich ore or magnetite-rich ore, the gangue can generally be removed by dry magnetic separation process, and then the lump-rich ore is obtained, and then the concentrate is obtained through the grinding-magnetic separation process.In order to obtain high-grade concentrate, magnetite concentrate can be treated by reverse flotation or high-frequency fine screen. In addition, in order to further improve the recovery rate, processes such as tailings gravity separation may also be considered to further recover magnetic minerals.
The gangue containing polymetallic magnetite often contains silicate or carbonate minerals, associated with cobalt pyrite, chalcopyrite and apatite, etc. Generally, the combined process of weak magnetic separation-flotation is used, that is, weak magnetic separation process recovers iron, and flotation process recovers sulfide or apatite.In general, the combined processes of weak magnetic separation-flotation process of polymetallic magnetite can be divided into weak magnetic separation-flotation and flotation-weak magnetic separation, the difference of which lies in the different direction of the continuum of magnetite and sulfide.For the weak magnetic separation-flotation process flow, the contiguous body mainly enters the iron concentrate; for the flotation-weak magnetic separation process flow, the conjoined body mainly enters the sulfide concentrate. Therefore, under the same grinding particle size, the first float and then magnetic process process can obtain iron concentrate with lower sulfide content and sulfide concentrate with higher recovery rate.
According to the types of iron-bearing minerals, common iron ore can be divided into magnetite, hematite, vanadium-titanium magnetite, limonite, siderite and mixed ore consisting of two or more of these iron bearing minerals. Among them, magnetite-hematite is a common mixed ore, and its beneficiation usually adopts a combined process flow composed of multiple beneficiation methods.
The single magnet-hematite is mostly fine-grained; the gangue mineral is mainly quartz, and some of it contains iron silicate. The proportion of magnets in the ore is gradually increases from the surface of the deposit to the deep part. The following two beneficiation methods are commonly used for selection:Weak magnetic separation, gravity separation/flotation/strong magnetic separationThe combined process of using weak magnetic separation to recover magnetite and then gravity separation, flotation or strong magnetic separation process to recover weak magnetic iron mineral.Production practice shows that for the weak magnetic separation-flotation process, the flotation method can be placed after the weak magnetic separation according to the nature of the ore and the actual conditions of the beneficiation plant, so as to ensure stable production indicators and save costs.
The iron minerals in polymetallic magnetite are mainly magnetite and hematite or siderite, medium and fine-grained; gangue minerals are mainly silicate and carbonate minerals or fluorite, etc., and the accompanying components include apatite , pyrite, chalcopyrite and rare earth minerals.The sorting of polymetallic magnetite is relatively complicated. Generally, the combined process consisting of weak magnetic separation and other mineral separation methods is used, that is, the weak magnetic separation method is used to recover the magnetite first, and then the gravity separation, flotation or strong magnetic separation method is used to recover weak magnetic iron minerals, and the associated components are final recovered by flotation.The above is the common magnetite beneficiation method. For magnetite beneficiation, it is recommended to tailor the process to suit your own through the beneficiation test, and rationally select the appropriate magnetite beneficiation method according to the final beneficiation test report.
Hematite is a mineral, which contains a lot of iron, colored black to silver-gray, brown to reddish brown or red. It is mined as the main ore of iron. Varieties include kidney ore, martite (pseudo morphs after magnetite), iron rose and specularite (specular hematite). While the forms of hematite vary, they all have a rust-red streak. Hematite is harder than pure iron, but much more brittle. Magnetite is a hematite- and magnetite-related oxide mineral. Formed in the oxidation conditions, hematite deposit is huge and associated with hydrothermal activity or sedimentation. Hematite is a metamorphosed sedimentary iron ore, which is mainly composed of magnetite, hematite, martite, and intergrowth with quartz, chlorite and so on. The contact metamorphic type hematite lives with magnetite, chalcopyrite, main symbiotic bornite, magnetic pyrite and garnet, diopside, phlogopite etc. In nature, magnetite and hematite can be transformed into each other. When the oxygen fugacity increases, magnetite can be oxidized to hematite; if still retain the original magnetite crystal, called martite. If only part of magnetite to hematite, it is called false hematite. When oxygen fugacity decreases, hematite and magnetite can be reduced; if retained the Hematite crystal, it is called the mu hematite.
Hematite is one of the most important economically minerals. Hematite is accessory minerals, which are widely distributed in a variety of rocks, the subdivision of particulate appeared in many igneous rocks. In special cases, it forms a huge block in the regional metamorphic rocks. In the red sandstone, hematite is cement of quartz particles, and the rock is colored. If it can be mined economically, it must contain tens of millions of tons of hematite. The reserves are causing a lot of scale deposition. There are a lot of the iron in the Precambrian strata, they usually contains impurities, such as silicon. And the exploitation of hematite deposit can be largely found in every continent. In 1961 the Soviet Union replaced the USA and became the largest producer of hematite. USA became the second followed by France, Canada, Chinese, Sweden and Australia. In USA, since the end of the nineteenth Century, the largest producing minerals place is Precambrian rocks in the Great Lakes region. Single crystal is often rhomb-shaped surface body and plate, aggregate morphological diversity, flake (phanerocrystalline), granular, oolitic, reniform, earthy, dense block etc. Phanerocrystalline is iron to steel grey, aphanitic dark red streaks, cherry red, metallic and semi metallic luster, which Mohs hardness is 5.5-6.5, no cleavage, the proportion of 5.0-5.3. It is iron black, shiny metal flaky hematite aggregates called Specularite; scaly gray, metallic luster of hematite aggregates known as mica hematite; reddish brown, shiny dark called ochre; a oolitic or kidney shaped hematite called oolitic hematite or kidney shaped. Hematite iron ore is very widespread in nature, which is an important raw material for iron making. It can also be used as a red pigment. The most important hematite ore deposit is a metamorphic origin; there are also some hydrothermal formations, or weathering and colloid formation of precipitates in large basin.
in the process of hematite mining, some mining equipment is at demands, such as jaw crusher, cone crusher as well as some ancillary equipment. InRussia, many of these machines can be bought in market. Shanghai SBM can offer that equipment as well, for it is a professional manufacturer and supplier of mining equipment in the world.
Its fully-enclosed layout features high integration. It integrates the functions of high-efficiency sand making, particle shape optimization, filler content control, gradation control, water content control, and environmental protection into a single syst
The mineralization in the Bltberget is a so-called "apatite iron oxide ore" which, besides the iron mineral magnetite and hematite, also contains the phosphorus mineral apatite, which previously caused problems in the production of iron before the invention of the Thomas process.
"We are very much looking forward to continuing the close collaboration with Nordic Iron Ore and that we get the opportunity to offer the most sustainable and productive solutions for the mining project," said Lars Senf at Epiroc Sweden.
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