Improving the Pelletization of Chromite Concentrate by HPGR and Its Mechanism

2015 ◽  
pp. 139-146 ◽  
Author(s):  
Deqing Zhu ◽  
Congcong Yang ◽  
Jian Pan ◽  
Yang Zhong
Keyword(s):  
Chromite Concentrate

scholarly journals Improving the Quality of Ferruginous Chromite Concentrates Via Physical Separation Methods

Minerals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 667 ◽  
Author(s):  
Sunil Tripathy ◽  
Y Murthy ◽  
Veerendra Singh ◽  
Saeed Farrokhpay ◽  
Lev Filippov
Keyword(s):  
Magnetic Separation ◽  
Chromium Content ◽  
Detailed Characterization ◽  
Physical Separation ◽  
Chromite Ore ◽  
Chromite Concentrate ◽  
Automated Mineralogy ◽  
Characterization Studies

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 ratio. Also, detailed characterization studies including automated mineralogy were carried out to better understand the nature of the samples. Enhancing the chromium-to-iron ratio was achieved by using advanced spiral separators which will be discussed in this paper.

Periclase-chromite refractories based on fused clinker and sintered chromite concentrate

Refractories ◽  
1989 ◽  
Vol 30 (7-8) ◽  
pp. 510-514
Author(s):  
K. V. Simonov ◽  
L. A. Voinikova ◽  
L. D. Bocharov
Keyword(s):  
Chromite Concentrate

scholarly journals Reactivity of Low-Grade Chromite Concentrates towards Chlorinating Atmospheres

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4470
Author(s):  
Ndue Kanari ◽  
Eric Allain ◽  
Lev Filippov ◽  
Seit Shallari ◽  
Frédéric Diot ◽  
...  
Keyword(s):  
Activation Energy ◽  
Thermogravimetric Analysis ◽  
Thermal Behavior ◽  
Gas Phase ◽  
Low Grade ◽  
Bearing Material ◽  
High Chromium ◽  
Chromyl Chloride ◽  
Chromite Concentrate ◽  
Iron Chromium

The most economically important iron-chromium bearing minerals is chromite. In natural deposits, iron(II) is frequently substituted by magnesium(II) while chromium(III) is replaced by aluminum(III) and/or iron(III) forming a complex chromium bearing material. The majority of mined chromite is intended for the production of ferrochrome which requires a chromite concentrate with high chromium-to-iron ratio. Found mostly in the spinel chromite structure, iron cannot be removed by physical mineral processing methods. In this frame, the present work deals with the reaction of chlorine and chlorine+oxygen with selected samples of chromite concentrates for assessing the reactivity of their components towards chlorinating atmosphere, allowing the preferential removal of iron, hence meeting the chromite metallurgical grade requirements. Isothermal thermogravimetric analysis was used as a reliable approach for the kinetic reactivity investigation. Results indicated a wide difference in the thermal behavior of chromite constituents in a chlorinating atmosphere when considering their respective values of apparent activation energy oscillating from about 60 to 300 kJ/mol as a function of the sample reacted fraction. During the chromite treatment by chlorine in presence of oxygen, chromium was recovered as liquid chromyl chloride by condensation of the reaction gas phase.

scholarly journals The method of processing technogenic tailings of chromium

2020 ◽  
Vol 56 (1) ◽  
pp. 15-22
Author(s):  
S. Dyussenova ◽  
B. Kenzhaliyev ◽  
R. Abdulvaliyev ◽  
S. Gladyshev
Keyword(s):  
Sodium Bicarbonate ◽  
Fine Fraction ◽  
Environmental Problems ◽  
Waste Rock ◽  
Centrifugal Separator ◽  
Comprehensive Utilization ◽  
Chromium Ore ◽  
Chromite Concentrate ◽  
Preliminary Activation ◽  
Practical Task

Taking into account the existing demand for chromium concentrates, the extraction of chromium from technogenic formations of sludge storages of the tailings of chromium ore beneficiation is an important practical task. The comprehensive utilization of beneficiation sludge will increase the profitability of production and solve the environmental problems of the region. The importance of solving the problem of involving in processing tailings is connected not only with the environment but also with the need to increase the production of chromium. Modern gravity enrichment technologies make it possible to efficiently produce chromium concentrates from large and medium fractions of chromite-containing ores, while finely divided sludge is practically not extracted due to the difficulty of separating complex minerals into concentrates and waste rock. This paper presents the results of studies on the gravity processing of tailings. The technology includes the enrichment of the fine fraction-0.2+0 mm of tailings of the dressing plant of chromite-containing ores by gravity methods using a KNELSON centrifugal separator. In technology, the efficiency of the operation of gravity enrichment is provided by the preliminary activation of the fine fraction in a solution of sodium bicarbonate (NaHCO3). With gravitational enrichment, the total chromite concentrate was obtained containing 51.3% Cr2O3. The output of concentrate was 41.7%. The extraction of Cr2O3 in the concentrate was 68.1%.

scholarly journals On the Flotation of a Low Grade Chromite Ore

2012 ◽  
Vol 6 (1) ◽  
pp. 19
Author(s):  
Tamam T. A. K ◽  
Ahmed A.S.Seifelnasr
Keyword(s):  
Oleic Acid ◽  
Iron Oxides ◽  
Froth Flotation ◽  
Pulp Density ◽  
Operating Parameters ◽  
Low Grade ◽  
High Grade ◽  
Chromite Ore ◽  
Chromite Concentrate ◽  
Representative Samples

This study is concerned with the processing of low grade chromite ores, Ingassena Hills by froth flotation techniques. For this purpose, representative samples were taken from four different mines. Mineralogical examinations indicated that, the major minerals are chromite and serpentine .Olivine, iron oxides and talc have been identified as minor minerals. Adequate degree of liberation of chromite was obtained by grinding the ore to minus 177µm. Froth flotation was used to upgrade that particular chromite ore. Oleic acid was used as collector. Several operating parameters influencing the floatability of both high grade chromite and serpentine were investigated. These include the concentrations of the collector and depressant, pulp pH and conditioning time. From an ore feed grading 20.27% Cr2O3, a chromite concentrate of 28.71% Cr2O3 with recovery of 94.54 % could be obtained by flotation at collector dosage of 0.300 kg /t , neutral pulp (pH 9) ,conditioning time ,2min ,and pulp density, 20%.

An integrated approach for production of stainless steel master alloy from a low grade chromite concentrate

2018 ◽  
Vol 335 ◽  
pp. 103-113 ◽  
Author(s):  
Deqing Zhu ◽  
Congcong Yang ◽  
Jian Pan ◽  
Liming Lu ◽  
Zhengqi Guo ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Master Alloy ◽  
Integrated Approach ◽  
Low Grade ◽  
Chromite Concentrate
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