آخرین محصولات
A novel reductive alkali roasting of chromite ores for carcinogen …
1. Introduction1.1. Oxidative process chemistry of chromite roasting in the presence of alkali. Chromium is an important metallic element, known for high and low temperature corrosion and oxidation-resistance properties, which the element imparts to the stainless steel and superalloys (Stringer et al., 1972).Other usages of chromium are in …
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Gravity separation of a UG-2 ore secondary sample for the reduction …
The chromium oxide (Cr 2 O 3) ... In the leaching process of chromite, how to quickly separate sodium chromate from leaching slurry is a key issue. In this paper, a simple method, named thermal sedimentation, was firstly introduced into the solid–liquid separation of sodium chromate. The results shown that the thermal sedimentation can ...
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Process for the production of chromium metal nuggets from chromite …
A process for the production of chromium nuggets from chromite ore/concentrate comprises: - oxidizing chromite ore/chromium concentrate (1 ) comprising a Cr : Fe-ratio ranging from 1.0 to 3.3 in a furnace (2) at a temperature of 900 °C, - mixing (7) the oxidized ore (4) with reductant coal (5) and fluxes (lime, silica) (6), - pelletizing (8) the mixture, - …
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RI89n PLEASE DO NOT REMOVE FROM LIBRARY II 7
Chromium is a commodity that is essen tial to the Nation's metallurgical, chem ical, and refractory industries. The United States has no domestic production or economic reserves of the only commer cial ore of chromium, chromite, and must rely on imports to meet national needs. The chemical industry uses approximately
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(PDF) Evaluation of Chromite Recovery from Shaking Table …
This study aimed to evaluate the chromite recovery from shaking table tail-ings of Forumad plant by a dry high-intensity magnetic separation. The average feed grade of chromium trioxide (Cr 2 O 3 ...
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Chrome ore beneficiation challenges & opportunities – A review
20 Main oxides present in natural chromite are that of chromium (Cr 2 O 3 ), iron (Fe 2 O 3 ), magnesium (MgO), aluminum (Al 2 O 3 ), and silicon (SiO 2 ), whereas chromite having greater than 45 ...
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Five Chrome Extraction Process to Teach you the …
Because the chromite has a weak magnetism, we can use the strong magnetic separator for chrome extraction. There are mainly the following two cases: one is in the weak magnetic field, remove the...
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Chromite: The only mineral ore of chromium metal
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.
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Beneficiation of South African chromite tailings using
The chemical composition of the chromite tailings sample is shown in Table 1. Table 1 shows that the sample had a chromite content of 20.03% with silica as the major gangue measured at 33.50%. The iron oxide content assayed at 17.94%. The chromite content corroborates the research that was conducted by [4] which indicated that there is sufficient
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Rapid Analysis of Chromite and Chrome Ore
Chromite and Chrome Ore, by Joseph I. Dinnin. U. S. Geological Survey Bulletin 1084-B Page 45: Under "Procedure (0^03 in separate sample)", item 3 should read: 3. Mix thoroughly with a platinum rod and cover with a suitable lid. Under "Calculation of percent G^OS" the equation should read: Percent Cr203 m m 1 dichromate X 2.534 X 100 s amp …
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Conversion of Chromium Ore Processing Residue to Chrome …
Trivalent chromium in chromite ore was oxidized to hexavalent chromium. The highly soluble hexavalent chromium was then removed from the COPR (left over Chromium Ore Processing Residue) leaving un-oxidized trivalent chromium ... on the Cr content), it is possible to separate metal from slag with proper chemical compositions at temperature …
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Processing of Ferruginous Chromite Ore by Dry High-Intensity …
This work investigated on the application of different dry high-intensity magnetic separators to separate the chromite grains from ferruginous chromite ore deposits of India. Prior to the separation, two different ore deposits of Sukinda region are subjected to detailed mineral, chemical, morphological, as well as magnetic properties ...
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Chromite
It is clear that chromite crystals can separate from an igneous magma during cooling. Separation may occur at the floor of the intrusion or within the main body of the intrusion in which case downward settling of the chromite may play a part. ... The chromite mineral is an iron chromium oxide (FeCr 2 O 4, Fig. 1.37). The chromite mineral is the ...
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Study on Slag-Metal Separation Behavior of Chromite by …
At this time, the separation of the metal phase and the slag phase is better. The main component of the reduced product slag phase is a …
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Recover Chromite by Flotation
The chromium is present in an impure chromite; in many cases, the low chromium content of the mineral precludes the preparation of high-grade concentrates. The chromite also is fine grained and intimately associated with the gangue constituents. ... The procedure consisted of stage-grinding samples of millfeed to minus 20-mesh and …
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CN101974688B
The invention provides a method for separating chromium ions and iron ions in a multicomponent solution, comprising the following steps of: with a mixed solution of chromic sulfate and ferric sulfate, generated by leaching out chromite by using sulfuric acid, as a raw material, adding an extractant to carry out extraction; obtaining an inorganic phase of …
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Amine flotation of chromite from acidic pulps
The method of claim 1, wherein from 0.5 to 1.0 lbs of amine collector per ton of ore is added to said aqueous pulp. 4. The method of claim 1, wherein said aqueous pulp is formed by mixing 24 to 27 pounds of chromite ore per 76 to 73 pounds of water. 5. The method of claim 1, wherein said pulverized ore prior to froth flotation is deslimed in water.
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Chromium Processing | Process Flow, Cases
How to determine the chrome ore concentrating method and select the right chrome mining equipment is closely related to the physical and chemical properties of chromium ore. Because chromite is weakly …
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Chromite mining pollution, environmental impact, toxicity and
Chromite mining activities are indispensable for production of goods and services. Sukinda is a major mining site of Odisha, India, polluted by chromium, which is highly toxic in its hexavalent form. The Sukinda valley is a rich source of chromites, amounting to almost 95% of Cr available in India, and is the fourth most polluted site …
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CN101974688A
The invention provides a method for separating chromium ions and iron ions in a multicomponent solution, comprising the following steps of: with a mixed solution of chromic sulfate and ferric sulfate, generated by leaching out chromite by using sulfuric acid, as a raw material, adding an extractant to carry out extraction; obtaining an inorganic phase of …
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Chromium processing | Extraction, Uses & Applications
Chromium metal was discovered by the French chemist Louis-Nicolas Vauquelin in 1797; the following year he isolated the metal by the carbon reduction of crocoite, or red lead, a chromate mineral whose …
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CN111389582A
The invention provides a method for separating chromite from laterite-nickel ore, which comprises the following steps: obtaining a first product after primary classification, wherein the first product comprises a first size fraction ore and a second size fraction ore which are bounded by a classification size, and the size of the first size fraction ore is larger than …
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Heavy Media Separation
Heavy media separation (or sink-and-float separation) is a part of the gravity separation process and uses heavy liquids in the separation operation. The primer liquids for density separation include bromoform (2.84 g/cm 3) and diiodomethane (3.31 g/cm 3 ), where heavy particles (heavier than the selected liquid) will sink while light materials ...
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separating chromium from chromite | Gulin Solutions
There are two general types of methods for separating chromium ore (chromite) values from associated gangue minerals by froth flotation techniques. » More detailed! Chromite - Scribd. The chromium spinel is a heavy mineral and concentrates to form ore deposits by gravity separation as the molten magma cools.
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4. CHEMICAL AND PHYSICAL INFORMATION
Service (CAS) Registry numbers for trivalent and hexavalent chromium are 1 and 1, respectively. Elemental chromium, chromium(0), does not occur naturally. Although there is a divalent state, chromium II (chromous), it is relatively unstable under environmental conditions and is readily
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Chromite ore beneficiation: prospects and challenges
Chromium has three common oxidation states, two of which Cr(II) and Cr(III) are basic and the other Cr(VI) is acidic. Chromium metal is an essential trace element, however, hexavalent chromium [Cr(VI)] is toxic and carcinogenic. Chromite is an important commercial chromium-bearing mineral. It is an oxide of chromium and iron (FeO, Cr 2 …
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Chemistry of Chromium
This page looks at some aspects of chromium chemistry. It includes: reactions of chromium(III) ions in solution (summarised from elsewhere on the site); the …
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Chromite: from the mineral to the commodity
source of chromium for chemical and metallurgical industries and to be marketed as a valuable commodity it requires very demanding quality parameters that differ according to the kind of application. Chromite ore cannot be usually sold as it is and, therefore, some kind of ore beneficiation is required in order to separate chromite from gangue
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FLOTATION BEHAVIOR OF SUDANESE CHROMITE ORES
There are two general types of methods for separating chromium ore (chromite) values from associated gangue minerals by froth flotation techniques. In the first method chromite ore which has been deslimed is subjected to flotation at a pH of 1.5 to 5.5 with a long chain fatty acid collector as reported by Havens (1946). The
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Improving the Quality of Ferruginous Chromite Concentrates Via …
The low chromium-to-iron ratio of chromite ores is an important issue in some chromite deposits. The value of the chromite ore is indeed dictated in the market by its iron, as well as its chromium content. In the present study, a chromite concentrate was reprocessed by gravity (spiral concentrator) and magnetic separation to enhance the chromium-to-iron …
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