In particular the stainless steel industry uses more than 90 % of the world's chromite output. The mining and steel industries must assess the quality of the chromite ore to optimize the grade of their stainless steel production. As a result, the chemical analyses of the chromite ore as well as its final and waste products are mandatory.
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Results demonstrated that iron, magnesium and aluminum could be effectively removed via oxalic acid treatment and subsequent pH adjustment, with chromium oxide as the final product. View
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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 …
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Chromite ((ce{FeCr2O4})) is the most commercially useful ore, and is extensively used for extraction of chromium. Chromium is produced in …
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With −1000 µm feed, grade of final product decreased down to 37.63% Cr 2 O 3, while chromite recovery in the final product was increased up to 81.63% within a single stage operation. In Fig. 6 b and c, effect of increasing solely the WW rate was presented while keeping plate inclination (8°) and feed rate (0.15 t/h) constant (for a 20 …
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Aside from contaminating the final product, B 2 O 3 reduction will consume excess reductant and also remove B 2 O 3 from the slag, making the fluxing effect less effective.
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A novel reduction reaction for extracting Cr 2 O 3 from chromite ores is demonstrated by excluding the formation of carcinogenic chromate (Cr 6+) intermediates.We have investigated in detail the underpinning high-temperature reduction reaction: FeCr 2 O 4 +Na 2 CO 3 +2[C]=[Fe]+Na 2 Cr 2 O 4 +3CO (g), which defines the …
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It is suggested that one area for future research is the low temperature carbothermic solid state reduction of chromite to produce an intermediate product, which can subsequently be upgraded to ferrochromium . ... decomposition temperature was increased to 1330 °C. Finally, the two researchers determined that (Fe, Cr) 7 C 3 was …
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The final product in the solution was chromium(III) sulfate obtained with about 83% maximum recovery, under the optimum leaching conditions of 175 °C, 2 h, 70% H2SO4 and 1/2 perchloric acid ...
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The final analytical program included the following masses: 45 Sc, 47 Ti, 51 V, ... an alteration product of the original chromite, or 2) an overgrowth formed on the outer surface of the original chromite. The formation mechanism of the former process could be either solid state inter-diffusion in which Mg, Al, Cr diffuse out from the parent ...
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The stainless steel industry serves as a primary driver of the chromite market, accounting for a significant portion of global chromite consumption. Chromite is a key ingredient in the production of stainless steel, where it is used as a primary alloying element to impart corrosion resistance, strength, and heat resistance to the final product.
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Chromite is an oxide mineral composed of chromium, iron, and oxygen (FeCr 2 O 4). It is dark gray to black in color with a metallic to submetallic luster and a high specific gravity. It occurs in basic and ultrabasic …
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Once the chromite is separated from the impurities, it undergoes roasting and leaching. ... From exploration and mine development to the final product, each stage plays a crucial role in …
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In the case of DRC, final products are solid, and the density difference between alloy and slag products makes the separation and recovery of alloy possible by conventional gravity techniques. The feed composed …
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Chromium (Cr) ore deposits are distributed worldwide, with significant deposits found in several countries. Some of the major regions with chromium ore deposits include: 1. South Africa: South Africa is one of the largest producers of chromite in the world and has the largest …
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The oxidation state of chromium in the final product formed in the reaction between K I and acidified potassium dichromate solution is: View Solution. Q2. Acidified potassium dichromate reacts with potassium iodide and oxidizes it to I 2. What is the oxidation state of chromium in the products of the reaction?
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Understanding the chrome plant process flow is essential for anyone interested in the mining and extraction of chromite ore. From exploration and mine development to the final product, each stage plays a crucial role in transforming the raw material into valuable chromium.
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allowing improved surface finish and final product features [12], [13]. Because local foundries use chromite sand to make moulds and cores, the local availability of chromite
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In this study, the reducing smelting of chromite concentrates by EAF-assisted metallothermic method was investigated. The effect of Al Powder and Al Dross addition amount, time, and the ratio of flux addition on the produced metal and slag compositions and metal recovery were investigated. It was seen that ferrochrome can be …
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The phase diagram shown in Figure 3 describes the phase content of spinel material like chromite under different conditions of temperature and pressure. The most prominent phases found in chromite are spinel and periclase. Spinel has a hardness value of 7.5–8 in the Mohs scale higher than periclase with a hardness value between 5.5 and 6.
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Chromite, or iron chromium oxide (FeCr2O4), is the mineral source of chromium. In its purest form, chromite comprises chromium (Cr2O3) at 68% and iron oxide (FeO) at 32%. ... which is then processed into products usable by local foundries. Chrome ore production by grade. According to estimates by the International Chromium Development ...
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Question: QUESTION: 1(a) Potassium chromate, a bright yellow solid is produced by the reaction of solid chromite ore ( FeCr2O4 ) with solid potassium carbonate and gaseous oxygen at high temperatures. The products of the reaction are solid iron (III) oxide and gaseous carbon dioxide.
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Podiform chromitites in the mantle sections of ophiolites belong to either high-Cr (metallurgical) or high-Al (refractory) varieties. Their highly variable compositions are reflected by different Cr#s [100Cr / (Cr + Al)] and Cr 2 O 3 and Al 2 O 3 contents of the chromite, falling in the boninitic and MORB fields, respectively. Parental magmas of …
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ferrochrome products (e.g. plasma chrome, a low-carbon FeCr alloy) is produced using DC furnace technology. The type of furnace, operating temperature, and slag chemistry are all factors that affect the recovery of Cr from chromite and hence the quality of the final product. The Cr/Fe ratio of the ore largely determines the Cr content of the
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chromium. 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 …
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Chromite is an oxide mineral that an iron chromium oxide with formula: FeCr2O4. It is belonging to the spinel group. Chromite is the most important ore of chromium. Crystals are uncommon, but when found they are octahedral. Chromite is usually massive or in the form of lenses and tabular bodies, or it may be disseminated …
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affect the recovery of Cr from chromite, and the quality of the final product. The Cr/Fe ratio of the ore largely determines the Cr content of the product produced in a particular furnace. Typical figures for chromium recoveries in various furnaces are given in Table II (Gasik, 2013). The energy required for smelting is also given (kWh/t
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In order to solve the problem of chrome slag returning to yellow and Red Mud accumulating in large amounts, this study proposes to use Red Mud and chromite ore process residue instead of clay to make glass-ceramics, and seal chromium, so as to achieve the purpose of waste control by waste and high-valued of final product. The …
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Chromite sand is often used as an alternative to silica sand, especially when the moulds require a low ... allowing improved surface finish and final product features [12], [13].
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