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process of dissolution of chromite ore

processing of ras-shait chromite deposits - sciencedirect

Jan 01, 1992 · Processing of Ras-Shait chromite deposits is attained through leaching of chromite which commercial sulphuric acid using a ball mill type autoclave. This process yields chromium sulphate which may be used in the chemical industry or used to produce chromium metal

a clean and efficient leaching process for chromite ore

Jun 01, 2014 · As shown in Fig. 6, temperature was significant to the dissolution process for chromite ore. The chromium extraction was relatively low after 5 h reaction at 160 °C (45%), but increased with leaching temperature and a high extraction was obtained at 220 °C (99%). Compared to the cleaner chromate salts production technology, the pressure leaching method realized high chromium extraction …

(pdf) optimization of process parameters and dissolution

Conclusion Dissolution of nickel and cobalt from the roasted chromite overburden was highly dependent on the amenability of ore minerals to organic acid attack

oxidation decomposition of chromite ore in molten

During decomposition of chromite ore in soda ash roasting process, oxygen and Fe 2þ on the surface reacts and new O 2À sublattice generates along the vacancies of cations (Reactions. This indicates

chromite ore - an overview | sciencedirect topics

To minimize energy consumption, the preprocessing of the chromite feed material, such as pelletized oxidative sintering or pelletized prereduction, is common. During the prereduction of chromite, the solid-state reduction of chromite occurs in composite pellets where solid C is heated up to temperatures of around 1300 °C before SAF smelting

determination of feo in chromite ore msk

During the process 0.5 gm of the chromite ore sample is taken along with 0.25 g V 2 O 5 (added in measured quantity that is enough for complete decomposition of the sample) in a 250ml conical flask. Then 20ml of acid mixture containing conc H 2 SO 4 and H 3 PO 4 in 2:1 ratio is added to it. It is then put on the hot plate for dense fuming

an investigation on the kinetics of chromiumdissolution

Similarly, in the kinetics of chromium dissolution from Philippine chromite ore, Chen et al. (2013) reported that the diffusion process gave a better straight line with a relatively good fit (R 2

(pdf) a reviewof chromite oreprocessing residue (copr

Chromite ore processing residue (COPR) is a waste byproduct of chromate production that contains high levels of hexavalent chromium (Cr[VI]). Although the high temperature chromite process was

modeling chromiumdissolutionand leaching fromchromite

Dec 30, 2005 · As a result of chromite ore processing, large amounts of chromite ore processing residue (COPR) material that can be classified as hazardous have been produced and released into the environment. Therefore, knowledge of migration behavior and leaching rates of chromium through waste materials are of primary concern for environmentally sound

dissolution of chromite in slags| request pdf

The dissolution process was monitored by chemical analysis of samples taken from the melt at predetermined time intervals and SEM–EDAX analysis of reacted chromite cylinders

dissolution made easy using peroxidefusions for icp-oes

Sep 03, 2019 · However, the traditional dissolution method for chromite and ferrochrome is a multi-step, multi-acid digestion which requires the use of HNO 3, HF and HClO 4 and can take between 1 to 3 hours. Knowing the risks associated with the use of HF and HClO 4 , many laboratories look for alternative methods to obtain full dissolution of their samples

processing of ras-shait chromite deposits- sciencedirect

Jan 01, 1992 · Dissolution of chro- mium fits a first-order reaction mechanism. The most favourable condition for H2SO4 to leach chromium from Ras-Shait chromite is at 250, for 30 rain, using 50% H2SO4 and chromite ore of grain size fraction < 64~tm. The dissolution of iron as ferrous sulphate can be reduced using commer- cial manganese oxide as an oxidizing

a coupling dynamic model fordissolutionand reduction of

For describing and resolving the process of chromium ore smelting reduction in a converter preferably, the coupling dynamic model was established based on the kinetic models of chromium ore dissolution and interfacial reducing reaction between the slag and metal. When 150 t stainless steel crude melts with chromium of 12% are produced in a smelting reduction converter with no initial chromium

leaching of valuable elements from the wastechromite ore

It is an industrial waste produced during the extraction of Cr(VI) from a chromite ore using the high-temperature roasting process. (11) In general, the COPR is alkaline (pH > 12), (5,7) and because of the presence of partially water-soluble, transportable, and carcinogenic hexavalent chromium, it is classified as a hazardous solid waste

chemistry and leaching behaviorof chromite oreprocessing

This study presents chemical, mineralogical, and leaching characterization of chromite ore processing residue (COPR) derived from the soda ash process, which is currently replacing the lime-based process in China, the world's largest chromite processor

production of ferro-chrome ispatguru

Jul 10, 2018 · Reducibility of chromite ore is important for process efficiency. It is determined by its mineralogy (MgO/Al2O3 ratio), the MgO structural form in the chromite ore, chromite grain size, the extent of grains distribution in ore and the ore melting temperature