Separating Chromite From Silica
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- Separating Chromite From Silica
chromite and the silica, and the chromium and silicon form the silicochrome [11]. 3.1.4. Medium carbon ferrochrome In c The range of carbon is 1-4% and that of chromium 65-75%. Simply by blowing ...
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The ore was washed and tabled to separate any gangue material. The chemical composition of the chromite after washing and tabling is shown in Table 1. ... new minerals formed via solid phase reaction between silica powder and chromite facilitated the minerals crystallization; a small amount of liquid phase formed during roasting …
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As a result, a wet magnetic separation technology for recovery of ultra-fine chromite (Cr 2 O 3) from spirals tailings as a scavenger was investigated. The Middle Group Chromitite …
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This study aimed to evaluate the chromite recovery from shaking table tail-ings of Forumad plant by a dry high-intensity magnetic separation.
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Effect of silica concentration on degree of sintering of chromite-silica ladle well filler sand based on South African raw materials. 2022, Journal of the Southern African Institute of Mining and Metallurgy. View all citing articles on Scopus. Biography: F Farshidfar(1985–), Male, Master.
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chromite by graphite in the presence of silica. II. EXPERIMENTAL PROCEDURE The chromite ore used in this study was from the LG-6 layer of the Bushveld Complex. The ore was washed and tabled to separate any gangue material. The chemical composition of the chromite after washing and tabling is shown in Table I.
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Although chromite costs about double the high cost of silica, the ability to magnetically separate chromite from silica and the high reclamation rate associated with furan binder made this system the low-cost choice. In addition to the cost benefits associated with the switch, voestalpine Nortrak also could reduce its landfill contribution …
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The research shows a simple scrubbing followed by an oxidation roast can be used to produce a quality sand for reuse. If sands contain chromite, a high-intensity dry magnetic separator can be used to separate this valuable material from silica after the cleaning treatment. A cost estimate of the method is included in the appendix of the report.
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Although chromite costs about double the high cost of silica, the ability to magnetically separate chromite from silica and the high reclamation rate associated …
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I'd like to study the sintering behaviour of a mixture of chromite and silica sand (mostly quartz) in rhyolite-MELTS v1.0.2 (since I am not considering water or any volatile phases). These sands are used as filler sands for steel ladle nozzles and their degree of sintering is key for a good performance (free open ratio).
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In the paper are shown the history, processing and applications of chromite. Chromite is an oxide of iron and chromium with the chemical composition FeO.Cr2O3 and belonging to the spinel group.
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Carbothermic reduction of chromite in the presence of nickel as the alloying element was investigated in a wide temperature range up to 1500 °C using thermogravimetric analysis coupled with…
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Removing Chromite from Silica Sand Background. To prove the feasibility of separators for separating chromite from silica in a reclaimed and reconditioned resin-bonded foundry sand; special interest to customer is percent of recovery, maximum capacity and screen analysis of recovered product in comparison to purchased material.
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Sanes are utilized to make molds for metal castings in the foundry industry. Approximately a half ton of sand is disposed of for each ton of metal cast in this country. The purpose of this investigation was to study and develop a process to separate chromite sand and silica sand from reclaimed sands for a steel foundry. Physical separations …
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The microwave absorption properties of chromite and the feasibility of microwave reduction chromite have been discussed. The results show that as the density increases, the dielectric properties of materials increase. The dielectric properties are the best (the value around 4.2) when the silica ratio is 0.5.
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The second stage involves the reduction of chromium, iron, and some silicon ions through the slag. The rate of reduction is proposed to be controlled by dissolution of the chromite into the slag with an activation energy of 256 kJ mol-1. Silica addition was found to enhance significantly the rate and degree of reduction at 1300 and 1400°C.
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The chromite product containing chromite, fused silica/chromite passes to the fluidised density separator. This material is automatically discharged onto a third …
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address this, dry magnetic separation is an alternative approach to separate these iron-bearing gangue minerals from the chromite. This work investigated on the application of different dry high ...
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Flotation, selective flocculation, as well as magnetic carrier separation studies have also been carried out for different chromite ores to separate chromite from the gangue minerals [32][33][34 ...
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Free opening rate is mainly determined by the performance of the ladle filler sand. High free opening rates of ladles are required in steel making to improve steel quality. Chromite ladle filler sands are one of the most widely used ladle filler sand. Several operative variables and materials characteristics affect the performance of the sands. …
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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 xide (Cr 2 O 3 ...
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In this paper, synthetic carnallite (MgCl2 ∙ KCl ∙ 6H2O) and amorphous silica (SiO2) preparation possibilities were investigated by utilizing chromite beneficiation plant tailings which contain 3.44% chromite (Cr2O3) and 30.55% magnesium oxide (MgO) by weight. Firstly, laboratory scale high intensity wet magnetic separator was applied for …
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The reduction behavior of a natural chromite from the Bushveld Complex of South Africa was studied at 1300 °C to 1500 °C. Reduction was by graphite in the presence of silica. Thermo-gravimetric analysis, X-ray diffraction (XRD) analysis, energy-dispersive X-ray analysis (EDAX), and metallographic analysis were the experimental techniques …
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The electric concentration process is mainly used to separate chromium ore from silicate gangue by using the difference of electrical properties of minerals, such as conductivity, dielectric ...
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Converting a sand system: one case study shows how … WebFeb 1, 2016 The furan bonded chromite/silica system offered the best payback. Although chromite costs about double the high cost of silica, the ability to magnetically separate chromite from silica and the high reclamation rate associated with furan binder made this system the low-cost …
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The results of this work show that the degree of sintering of chromite-silica well filler sand depends strongly on the silica content. The amount of liquid phase formed increases with increasing ...
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The hydrosizer feed in the studied circuit (Fig. 1) is the middle product of the shaking tables with an average Cr 2 O 3 grade of 17%. The feed is classified based on the specific gravity and the liberation degree of particles. Outputs of spigots 1 and 2 are introduced to two separate spirals, and the output of spigot 3 is introduced to a shaking …
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Sand reclamation is used in foundries, as it promotes the reuse of spent chromite sand and saves on disposal costs. Every foundry with a reclamation plant aims to remove as …
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Chromite is composed of chromium, iron, and oxygen, with variable amounts of magnesium, aluminum, and other elements. Chromite can occur in different forms within chromium ore deposits, including: Massive chromite: Chromite can form large, irregular masses or aggregates in the host rock, known as massive chromite. …
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The production of sand dust during mechanical reclamation has several repercussions on the foundry industry, most notably on the environment. In the case of silica sand, sand particles expose workers to lung diseases such silicosis, pneumonia and cancer that can have a permanent negative impact on their health. 5 Furthermore, the …
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low silica content • pH and Acid Demand Value - important tests in predicting issues with curing and strength development in chemical binder systems • LOI- Loss on Ignition - can be used to look for accessory minerals and impurities associated with the chromite sand. • Turbidity- an indicator of the cleanliness of the chromite sand
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@article{Botha2022EffectOS, title={Effect of silica concentration on degree of sintering of chromite-silica ladle well filler sand based on South African raw materials}, author={Martin Botha and J.D. Steenkamp and M.B. Shongwe and Sandra Brill and Guy George Freemantle}, journal={Journal of the Southern African Institute of Mining and ...
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In this project, chromite tailings from Western Limb of the South African Bushveld Igneous Complex (BIC) was characterised with the objective of recovering fine and ultrafine chromite using wet magnetic separation process.
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