Semantic Scholar extracted view of "Effect of sodium aluminate on chromium spinels oxidation in chromite lime-free roasting process" by Tiangui Qi et al.
A process mineralogical study based on three texturally and mineralogically different chromite-bearing ore types at the Nkomati nickel mine was undertaken, with focus on chromite. Chromite is a by-product of the Ni-Cu-Co-PGE ore at Nkomati Nickel mine. These being the PCMZ_MG (medium-grade Ni-Cu sulphide silicate ore with …
Given the information presented above, the applicator should have a better understanding of how passivates function, and can use that knowledge to adapt and amend those facets and components to achieve the color, film thickness and corrosion protection desired without resorting to extreme monetary investment, process innovation, or …
The crushing ratio, which essentially assesses the propensity of the sand to produce fine particles during moulding operations, is a critical property to predict the effectiveness of the mechanical reclamation process. This study assesses the crushing ratio of South African chromite sand.
Recently, it was proven that pre-oxidation of chromite ore prior to pelletization and prereduction significantly decreases both the SEC and lumpy carbonaceous reductants required for smelting.
The Board Consists of Specialists from different industries combinging mining exposure and experience. The Board takes enormous effort to attain leadership in the Mining in Sudan. With a copious business acumen of Su. Sivakumar and N. Janardhan has developed a feasible mining process method, in order to maintain cost effectiveness with an ample ...
Physical properties of ores, especially hardness, friability and grindability play a vital role in grinding to achieve the desired fineness for pelletisation process [3, 4].
Oxidation treatment of chromite ores is a commercially applied process for producing mechanically strong pellets for smelting operation in submerged arc furnace. The oxidation behaviour of chromite ores which essentially determines pellet quality bears a strong relationship with ore chemistry, heat treatment, temperature and time.
In this study, modeling of spiral concentrator for concentrating the ultra-fine chromite was investigated. A three-level Box–Behnken design combining with a response surface methodology (RSM) and quadratic programming (QP) were employed for modeling and optimization of spiral concentrator performance.
We collected UG2 ore samples around the secondary mill of an industrial process plant. The particle size distribution of the samples were analysed by optical means in both wet and dry conditions. The acquired images were further processed to achieve chromite identification. Optical-based methods were shown to be viable candidates for …
This process affords pellets with the mechanical properties necessary for the ferrochrome smelting procedure, and the process is not implemented to maximized the pre-oxidation of chromite.
Due to the increased demand and limited supply of nickel, the chromite overburden found in Sukinda Valley, Odisha, can be effectively utilized. This study proposes an alternative method for producing high-quality indurated pellets suitable for direct reduced iron production, which can be further smelted to obtain nickel-based alloys in an energy …
Abstract: In this study, an optimum beneficiation route was developed for an existing concentrator that processes low-grade chromite deposits. This objective is challenging as the grade of the ore under consideration is approximately 5%, which is the lowest grade processed in Turkey. Detailed characterization, process mineralogy and liberation …
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.
Request PDF | An investigation into the co-sintering process of limonitic nickel laterite and low-grade chromite via multi-force fields | This study is aimed to obtain better-quality Ni-Cr ...
The Board Consists of Specialists from different industries combinging mining exposure and experience. The Board takes enormous effort to attain leadership in the Mining in Sudan. With a copious business acumen of Su. Sivakumar and N. Janardhan has developed a feasible mining process method, in order to maintain cost effectiveness with an ample …
Pelletised chromite pre-reduction is most likely the ferrochrome pro-duction process option with the lowest specific electricity consumption currently applied. In this paper, the unique process ...
This article reviews the major process flow sheets in practice for the recovery of chromite values from various types of ores and critical issues related to chromite ore beneficiation.
To be able to responsibly develop a multiphysics model of the steel belt sintering (SBS) process used to sinter chromite fines, it is important to have a comprehensive understanding of the process.
kg scale to study the sintering of chromite ore fines, starting with the equivalent flux composition as in the resistance fur- nace experiments, plus the carbon needed to attain the sin- tering temperature of 1600°C.
To produce desirable sinter products required by the blast furnace smelting process, sintering tests of ore mixtures made from a low grade South African chromite concentrate (Cr2O3/FeO = 1.99) and ...
In general, as-sprayed lanthanum chromite-based interconnector with pores, micro-cracks and unbonded lamellar interfaces requires an annealing treatment above 1450 C to achieve gas-tightness (Ref 9). Such post-sin-tering process leads to interdiffusion with Cr involved between different components of SOFC (Ref 14).
The close correspondence of chromitite and PGE enrichment strongly suggests that the contamination process that resulted in chromite formation also triggered precipitation of the PGE. The base of each major chromitite layer marks the point where there was a substantial injection of new magma into the chamber, which resulted in …
The most important aims of the process to be developed were as follows: (i) to obtain a chromite concentrate with at least 60%Cr2O3 recovery (ii) to obtain a marketable concentrate with at least 44%Cr2O3 content (iii) to ensure a positive contribution to the environment by adopting an environmentally friendly beneficiation procedure.
The reduction product has been made the SEM analysis and phase analysis, low-carbon ferrochrome prepared chromite reduction method that microwave thermal field of silicon, the main chemical components to meet the requirements of …
Therefore, there is potential to use H 2 as the reducing agent for the direct hydrothermal reduction of a Na 2 CrO 4 solution produced by the liquid phase oxidation of chromite ore to achieve a cleaner and shorter preparation process of Cr 2 O 3.
In order to improve the chromate salts cleaner production technology, a pressure leaching process for chromite ore in 50wt% KOH solution was studied f…
Sodium chromate is separated from Fe salts through liquid–liquid extraction or other suitable methods and crystallized as an end product of the process. This process generates waste, chromite ore processing residue (COPR) as a solid mud.
If necessary, the weak magnetic – strong magnetic separation process can also be used to effectively separate the ore and achieve the chrome extraction.
The pelletised chromite pre-reduction process is currently the industrially applied ferrochromium production process with the lowest specific electricity consumption. Results obtained from this study proved that the pre-oxidation of chromite ore prior to milling, agglomeration and pre-reduction significantly enhances the level of chromite pre ...
Chromite is an oxide mineral belonging to the spinel group, a complex mineral containing magnesium, iron, aluminum, and Cr in varying proportions, depending on the deposit, that can be represented as FeCr 2 O 4 or (Fe 2+,Mg) [Cr,Al,Fe 3+] 2 O 4 ( Murthy et al., 2011; Sanchez-Segado et al., 2015 ).
Chrome ore properties play a critical role in various pelletisation subprocesses (grinding, filtering, pelletisation and sintering) and slight variation in ore properties significantly affect the whole pelletisation process. Three ore samples (sample-A, B and C) were collected from different working faces of a chromite ore mine.
Experiments were also carried out in a sinter pot on 10-kg scale to study the sintering of chromite ore fines, starting with the equivalent flux composition as in the resistance furnace experiments, plus the carbon needed to attain the sintering temperature of 1600°C.
