Investigation of the Enrichment Possibilities of Tekcrom Mining Company Tailings (original) (raw)
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Characterisation and separation studies of Indian chromite beneficiation plant tailing
International Journal of Mineral Processing, 2013
Detailed characterisation and recovery of chromite from the beneficiation plant tailing of Sukinda, India, was investigated. Different characterisation techniques viz. size analysis, size-wise chemical analysis, size-wise density measurement, X-ray diffraction analysis, heavy liquid separation, scanning electron microscopy, mineral analysis by QEMSCAN and thermo gravimetric analysis were carried out. Based on the results, two flow sheets comprising gravity, magnetic separation and flotation, were used to recover chromite values. A chromite concentrate of 45.0% Cr 2 O 3 with a Cr:Fe ratio of 2.3 can be produced from the tailing analyzing 17.0% Cr 2 O 3 and Cr:Fe ratio of 0.49.
Recovery of chromite values from tailings of COB plant using enhanced gravity concentrator
2017
In world scenario, India is ranked third largest producer of chromite ore. Odisha Mining Corporation Ltd. is operating a chromite ore beneficiation (COB) plant with a capacity of 0.15 mtpa. The process route basically involves comminution, classification followed by gravity separation. The present plant practice generates tailings with some chromite values associated with it. In the present study, an attempt was made to recover chromite values from the tailings using enhanced gravity separator such as Falcon concentrator, a high g-force generating equipment. The tailing sample is very fine grained in nature and contains significant amount (~68 Wt.%) of particle below 11 μm. The chemical analysis of head sample shows a value of 20.23% Cr2O3. Mineralogical study revealed that chromite is the major chromite bearing mineral and clay, gibbsite and spinel are the major gangue minerals present in the material. The process parameters are optimised with respect to feed particle size, bowl ro...
Recovery of Chromite Values from Plant Tailings by Gravity Concentration
Journal of Minerals and Materials Characterization and Engineering, 2011
Large tonnages of chromite tailing were discarded during processing of chromite ore in the conventional circuit. A typical chromite plant tailing was treated in wilfley table for the recovery of chromite values. Optimisation study was carried out for the process parameters of wilfley table using empirical models, developed from the experimental data. It was found that grade and recovery (% Cr 2 O 3) in the concentrate fraction majorly depended on the variation of deck tilt angle. To achieve high grade (>45%) with acceptable recovery (>40%), set of optimisation condition of parameters have derived which resulted large quantity of wash water (>5lpm of flow rate) is necessary. Validation of the empirical models were done with set of tests which resulted good agreement with the predict values (R 2 is 0.96 and 0.99 for the grade and recovery respectively).
Beneficiation of Konya-Beyşehir Chromite for Producing Concentrates Suitable for Industry
JOM, 2016
Turkey has a 6% share of world chromite mining and possesses 25 million tons of reserves. Despite their economic importance, the most important Turkish chromite reserves have not been extensively studied with respect to their composition. In this study, the possibility of upgrading Konya-Beys¸ehir (Turkey) chromite to produce chromite concentrates suitable for industry is investigated. Two groups of enrichment experiments were made. The effects of some parameters that markedly influence the separation of a shaking table, such as the amplitude and slope of the shaking table and the frequency of strokes were investigated in the first group of experiments, The shaking table experiments were planned and carried out using the statistical methods of Design of Experiments (Yate's and ANOVA) in the second group of experiments. As a result, it was found that a concentrate containing 46.89% Cr 2 O 3 content with a yield of 85.18% was obtained from a feed containing 3.98% Cr 2 O 3 content in 0.2 + 0.1 mm size fraction.
Recovery of Chromite From Plant Tailings By Falcon Concentrator
2018
The objective of the present study was to investigate to recover chromite from Sivas -KangalÇamözü chromite plant tailings assaying 4.95% Cr2O3by using a Falcon Concentrator. By using L40 type Falcon Concentrator a concentrate assaying of 13% Cr2O3 with 63.03% recovery was obtained from Çamözü plant tailings at 30 G rotor rotation speed with -150 micron feed grain size at 40 kPa water pressure. It was found that the degree of liberation is an important parameter for Falcon Concentrator. At -600μ, -500μ and 300μ grain sizes by increasing rotor rotation speeds the grades of chromite decrease and recoveries are increase.
Benefication of low-grade chromite ores of abandoned mine
2009
Optimum enriching possibilities of chromite ores from the abandoned Topraktepe mine were investigated. To obtain the best enriching method(s), shaking table, multi gravity separator, humprey spiral and jigging tests were tested. The best grades for Cr2O3 are 55.65 % by shaking table, 57.52 % by multigravity separator, 54.58 % by humprey spiral test and 50.68 % by jigging. To provide these results, the particle sizes of the ore are-0.3 to 0.212 mm for shaking table,-0.106 to 0.075 mm for multi gravity separator,-0.3 to 0.212 mm for humprey spiral and-2 to 1 mm for jigging. Regarding the best grades obtained, the recoveries for shaking table, multi gravity separator, humprey spiral and jigging methods are 85.38 %, 79.83 %, 94.89 % and 87.58 % respectively. The results of these tests show that a further recovery of remaining 500 000 tons of ore could be possible from the abandoned Topraktepe chromite deposit.
Classification is a method of separation of fines from coarse particles and also lighter particles from heavier particles. The conventional classifiers, such as, hydrocyclone or mechanical classifiers, decreases the efficiency of the grinding and concentration circuits due to their imperfect separation. In the process of improving the efficiency of classification, a device that has been gaining popularity in recent years is the teeter-bed or hindered-bed separator such as Floatex density separator. Generally for processing chromite ores, different types of gravity methods are employed after crushing, grinding followed by classification. The Tata Steel Chrome Ore Beneficiation (COB) plant is generating 50 tph of tailings assaying 17% Cr 2 O 3. A critical review on practice of the plant operating personnel is concerned in the grade-recovery characteristics of unit operations. But separation insight and influence of different operating and process parameters are essential to understand and control the process. The objective of the present investigation was to study the effect of the important operating variables on floatex density separator and preconcentration of COB plant tailings for the further beneficiation process and found that significant removal of iron bearing mineral such as goethite and silica is possible using FDS in a single stage operation. The maximum of 83% recovery of chromite is possible with 22 to 23% Cr 2 O 3 content and thus obtained FDS underflow is suitable for flotation circuit. A low teeter water flow rate with a high bed pressure removes iron bearing mineral like goethite efficiently in an FDS.
Influence of shaking table process parameters on concentration of chromite plant tailings
2010
Conventional chromite beneficiation plants of India discards large tonnage of chromite values as plant tailing. In the present investigation, a typical chromite beneficiation plant tailing of Sukinda region has investigated by using wet shaking table for the effective utilisation of the natural resource. In this context, the effect of different process variables such as wash water flow rate, deck tilt angle and feed flow rate has analysed. The interactional effects between different process variables has analysed in terms of 3D response surface plots. It was found that the Cr 2 O 3 content has improved to 61.37% from a feed assaying 24.26%. It was envisaged that deck tilt angle has influence major on both grade and recovery of concentrate fraction of shaking table and in case of interactional effects, the interaction between deck tilt angle and feed flow rate has major influence compared to the others. Second order quadratic equations have developed for the prediction of grade and recovery of concentrate fraction of shaking table.
Benefication of low-grade chromite ores of abandoned mine at Topraktepe, Beyşehir, SW Turkey
Acta Montanistica Slovaca
Optimum enriching possibilities of chromite ores from the abandoned Topraktepe mine were investigated. To obtain the best enriching method(s), shaking table, multi gravity separator, humprey spiral and jigging tests were tested. The best grades for Cr 2 O 3 are 55.65% by shaking table, 57.52% by multigravity separator, 54.58 % by humprey spiral test and 50.68 % by jigging. To provide these results, the particle sizes of the ore are -0.3 to 0.212 mm for shaking table, -0.106 to 0.075 mm for multi gravity separator, -0.3 to 0.212 mm for humprey spiral and -2 to 1 mm for jigging. Regarding the best grades obtained, the recoveries for shaking table, multi gravity separator, humprey spiral and jigging methods are 85.38 %, 79.83 %, 94.89 % and 87.58 % respectively. The results of these tests show that a further recovery of remaining 500 000 tons of ore could be possible from the abandoned Topraktepe chromite deposit.
Gravity Concentration of Sudanese Chromite Ore Using Laboratory Shaking Table
Physicochemical Problems of Mineral Processing, 2012
The main raw materials for chromium metal is chromite. Geologically, chromite deposits are associated, by their nature of formation, with specific gangue minerals such as serpentine, olivine, and chlorite. These associated minerals are of lower densities than chromite. This criterion of density difference between chromite and the associated minerals suggests the use of gravity separation techniques for concentrating the low-grade chromite ores. This paper presents the results of an investigation on the concentration of a low-grade (30% to 35% Cr2O3) chromite ore from Chickay Mine, East of Sudan, using a shaking table. The studied parameters were the table tilt angle and the feed size distribution. The optimum table tilt angle was 6ο, and the best performance of the table was obtained when the feed was split into two size fractions, -1.168 + 0.18 mm and - 0.18 mm, without desliming. The concentrate assay, under these conditions, was 47.2% Cr2O3 at a recovery of 75 percent.