Periclase. Periclase (MgO, M.P. 2825°C) is the most important refractory mineral in the metals industry. It can be found in the following refractories: magnesia, chrome-magnesia, forsterite-magnesia, spinel-magnesia, and dead-burned dolomite.Because of its high melting point, low cost (≈$270/ton), and resistance to corrosion by basic slags, it is used widely in the basic steel …
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Most ores consist of the mineral chromite, the ideal formula of which is FeCr 2 O 4. It is widely dispersed in natural deposits, which are usually contaminated with oxygen, magnesium, aluminum, and silica; their chromium …
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We manufacture finest quality chrome ore, which can be obtained in different specifications and grades as desired by our esteemed customers. The chrome ore offered by us is pure and is free from any unwanted particles. ... Melting point: 2150°C . Properties: Good thermal conductivity, good resistance to thermal shock, high dimension ...
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Ternary diagram of Cr 2 O 3 -MgO-Al 2 O 3 shows that the slag component of chrome ore can have a melting temperature as high as 2000 °C. ... of this composition can have a melting point as high.
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Experimental smelting of three batches of prereduced chromite raw materials with different degrees of metallization of chromium was conducted in the 0.2 MVA ore-smelting furnace of the Chemical and Metallurgical Institute named after Zh. Abishev (Karaganda). To assess the performance indicators of the remelting of prereduced chromite raw materials in industrial …
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The presence of these refractory constituents makes the ore a very high melting mineral. Hence, it is difficult to produce sinter from chrome ore. ... (point 7) in chrome ore sinter of test 6. Table IX. Sintering Characteristics of Iron Ore vis-à-vis Chrome Ore Parameter Iron Ore Bed height (mm) Suction (mmWG) Maximum sintering temperature ...
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Chromium processing, preparation of the ore for use in various products. Chromium (Cr) is a brilliant, hard, refractory metal that melts at 1,857 °C (3,375 °F) and boils at 2,672 °C (4,842 °F). In the pure state it is resistant to ordinary …
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The consolidation mechanism of roasted chrome pellets have been describe as the formation of liquid phase which plays an important role in strengthening chrome ore pellets,and the binder plays a vital role information of low melting point silicate liquids .
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Chromium (IV) oxide (CrO 2) is used to manufacture magnetic tape. Chromium is mined as chromite (FeCr 2 O 4) ore. Chromium ores are mined today in South Africa, Zimbabwe, …
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Chromium has an atomic weight of 51.9961, a density of 7.14, a high melting point of 1900°C, moderate thermal expansion, and a stable cubic crystalline structure (Merck, 1983). ... chemical, in dyes and pigments, chrome plating, leather tanning, and wood preservation ... Chromite ore is the primary material to produce chromium compounds and ...
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The atomic weight of the most abundant (83.789%) chromium isotope is 51.996. A total of 26 isotopes of chromium from 42 Cr to 67 Cr are known. Among them, there are three stable isotopes: 52 Cr, 53 Cr, and 54 Cr. 53 Cr is the product of 53 Mn radiogenic decay (a half-life is 3.74 m.y.). In addition, there are 19 radioisotopes with 50 Cr being the most stable (with …
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Mining and Concentrating: Chromite ore is mined and then concentrated through gravity and magnetic separation techniques to increase the chromium content. Metallurgical Processes: Smelting: The concentrated ore is …
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French chemist Louis Nicolas Vauquelin first isolated chromium from a bright red mineral called Siberian red lead, now known as lead chromate (PbCrO4) in 1797. According to John Emsley in his book, "Natures Building Blocks: An A-Z Guide to the Elements" (Oxford University Press, 1999), it took Vauquelin a …
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Chromite (Cr) occurs exclusively in mafic and ultramafic igneous rocks (Papp and Lipin, 2006).Although some Cr-based minerals such as crocoite (PbCrO 4), vauquelinite (Pb 2 Cu[CrO 4][PO 4]), uvarovite (Ca 3 Cr 2 [SiO 4] 3), and merumite (4(Cr,Al) 2 O 3 ·3H 2 O) are well known, chromite (FeCr 2 O 4) is the only one that is a commercially recoverable source of Cr (Sueker, …
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The binder or veinstone is mainly serpentine with small quantity of magnesia (MgCO3) in veins of chrome ore. Melting temperature of the ore is 1650 – 1660°C [1]. We have used different ores …
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Chromium is mined as chromite ore. Globally this ore is available in India, South Africa, Finland, Zimbabwe, Kazakihstan and the Philippines. Commercially, chromium is …
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From the ternary phase diagram [2] of Cr 2 O 3 -Al 2 O 3 -MgO (Figure 2), it can be estimated that the chrome ore of this composition can have a melting point as high as 2200 °C, which is ...
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Chrome ore's main component is chromite, an oxide mineral containing chromium and iron with a black luster and high hardness. Chrome's molecular formula is FeCr2O4 (Cr2O3 68%, FeO …
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The raw materials used are chrome ore, coke, and silica. High-quality metallurgical grade chrome ore requires Cr 2 O 3 > 48%, S < 0.1%, P < 0.1%, and Cr 2 O 3 /FeO > 3. The blast furnace method can only produce special pig iron with chromium content of about 30%. ... Due to the high-melting point of ores and alloys, the required furnace ...
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Chrome Ore. Chromium, a metallic element, has an atomic number of 24 and an atomic weight of 51,996. Chromium, one of the natural components of the earth's crust; It is one of the basic elements of metallurgy, chemistry and refractory industries. ... Since chromium is very hard and its melting point is 1857 °C, it is used to harden metals and ...
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Melting point: 1907°C, 3465°F, 2180 K Period 4 Boiling point: 2671°C, 4840°F, 2944 K Block: d Density (g cm −3) 7.15 Atomic number: 24
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This hard, brittle gray metal with both a high melting point and corrosion resistance, makes it a key element in stainless steel production. What is the use of chrome ore? Chromium is used with a range of other metals to provide hardness to steel, as well as a plating material due to its non-corrosive nature.
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Melting point: 1907°C, 3465°F, 2180 K ... This ore is found in many places including South Africa, India, Kazakhstan and Turkey. ... Chrome yellow, also known as "school bus yellow", was adopted in 1939 for all U.S. school buses to provide high contrast and visibility in twilight hours. However, the presence of both toxic lead and hexavalent ...
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Refer to this chart for the melting points of various metals and alloys. For example, copper melts at 1084°C and steel has a melting point that ranges from 1371°C to 1593°C Choose your region
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Chrome ore concentrate consists of high-temperature melting oxides such as Cr2O3, MgO, and Al2O3. The presence of these refractory constituents makes the ore a very high melting mineral. Hence, it is difficult to produce sinter from chrome ore by a pyrometallurgical route. Currently, chrome ore is ground to below 75 μm, pelletized, heat hardened through …
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The binder or veinstone is mainly serpentine with small quantity of magnesia (MgCO 3 ) in veins of chrome ore. Melting temperature of the ore is 1650 -1660°C [1]. ... there exists a range of MgO/Al 2 O 3 ratio in slag where its melting point is the lowest corresponding to a minimum of energy consumption for the portion of slag to be melted ...
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The melting point of chromium is 1907°C; The boiling point of chromium is 2672°C; The density of chromium is 7190 in S.I. units at 20°C; Chromium can be highly polished. Polished chromium reflects about 70% of …
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In the Aksu Ferroalloy Plant (AFP, Kazakhstan) test industrial melting has been conducted aimed at establishing the possibility of using chromium ore briquettes in large and powerful ore reduction furnaces with a power of 63 MW with the aim of using sub-standard chromium raw material in production, and improvement of technical and economic indices for …
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16.3.2.3 Extra-Low Carbon Ferro-Chrome. In the manufacture of extra-low carbon ferro-chrome (0.05–0.06% C), chrome ore is reduced with the silicon of ferro-silico-chrome. The reaction is exothermic, i.e. can proceed at lower temperature.At lower temperature the thick high chromium slag is made, which retards the diffusion processes and reduces the reaction rates …
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Melting Point > 1,500°C: Odor: Typically odorless: Hardness: Influenced by chromium content, generally hard: Magnetic Properties: ... The primary raw material for ferro chrome production is chromite ore, a mineral containing chromium oxide (Cr 2 O 3). Mined from chromite deposits, this ore undergoes beneficiation processes to remove impurities
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and iron, namely, ferrochrome or char ge-chrome. The name of the element is derived from the Greek word 'chrôma', meaning colour, because many of its compounds are intensely coloured. It is a steely-grey, lustrous, hard and brittle metal which takes high polish, resists tarnishing and has a high melting point. RESER VES/RESOURCES
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