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4 ·Preparation of potassium dichromate In the industrial production finely powdered chromite ore FeOCr 2 O 3 is heated with anhydrous sodium carbonate Na 2 CO 3 and flux of lime in the air in a reverberatory furnace [ce{4 8Na2CO3 7O2 >[Delta] 8Na2CrO4 2Fe2O3 8CO2}]
·Chromium has a wide range of applications including as an alloy addition in various steels and also as a corrosion resistance coating Carbothermal reduction of chromite ore FeCr 2 O 4 in a submerged arc furnace is an important industrial process for extracting chromium but the energy consumption is is suggested that one area for future
·Chromite ore is an essential raw material for producing Cr Fe alloy which is necessary for stainless steel industry [] High grade chromite ore is mainly used as an indispensable feed material in the submerged arc furnace however chromite ore with low Cr 2 O 3 /FeO ratio usually is not well received and have to be matched with other high grade
SYNOPSIS South African chromite ores are smelted using SiO 2 and CaO containing fluxes normally as quartz and limestone respectively The purpose of SiO 2 is to lower the melting point of the ore while CaO is added to ensure that the slag that forms on smelting is fluid enough to enable slag/alloy separation and tapping from the furnace
·Extraction of Cr VI from chromite ore processing residue via hydrothermal assisted phase transformation Chinese Chemical Letters IF Pub Date 2020 07 01 DOI /
·To improve chromite recovery with the Humphrey s spiral a sample of Emma Bell ore was ball mill ground to minus 100 mesh and then processed with the spiral table 11 This procedure improved the concentrate grade splits 1 and 2 to pct Cr2O3 from 17 pct for the minus 28 mesh test see table 9 but did not decrease the grade in the
·Chromite ore FeOCr 2 O 3 is the most important mineral occurrence of chromium and some deposits are reported in Anka Local Government Area of Zamfara State This work involves the analysis of
·Chromite the most viable among the chromium minerals is used continuously to produce high quality chromium compounds The economics of chromite recovery from the ore depends upon the occurrence and its chemical composition [1 2 3] In Nigeria for example sufficient reserves of chromite ore are found at Awe Local Government of Nassarawa State
·1 Introduction The soda ash roasting process produces Chromite Ore Processing Residue COPR containing 1130 8500 mg/kg carcinogenic hexavalent chromium Cr VI due to the industrial incomplete leaching Du and Chrysochoou 2018 Chrysochoou et al 2009 Compared with the lime based roasting process soda ash as the complexing agent
·The mineral chromite is such a cubic spinel and therefore has the chemical formula FeCr2O4 [14] Chromite ore however is not pure chromite but rather consists of a complex solid solution phase with the general form Mg Fe2 [Cr Al Fe3 ]2O4 [15] Chromium cations are distributed throughout the crystal lattice and solid state
· Study of Cr L Lines The chromium L lines fluorescence spectra of metallic chromium chromite ore and K 2 Cr 2 O 7 are illustrated in Figure 2 and a clear revelation of the large differences in their spectral pattern is evident with the total band spectrum being spread over the 550 590 eV energy region Peak position and chemical shift are summarized in Table 2
·A stratiform chromite ore body crops out in the lower part of the dunitic mantle crust transition zone DTZ that developed at the top of a mantle diapir in the Maqsad area in the Oman ophiolite It is made of layers ranging in thickness from a few mm to a maximum of 3 m and in modal composition from massive to antinodular and disseminated ore
·The principal ore mineral present is chromite which occurs as relatively large 3 mm subhedral grains with minor overgrowths of ferritchromit and magnetite Figure 4 A The grains are commonly highly fractured with fractures filled by veins of magnetite and serpentine Chromite is associated with olivine or serpentine replacing olivine
·The objective of this study was to characterize the particle size distributions PSDs of chromite ores comminuted by different devices subjected to different breakage modes and to compare
· Corresponding authors a School of Environmental and Chemical Engineering Jiangsu Ocean University Lianyungang China E mail xiaming b Jiangsu Institute of Marine Resources Development Jiangsu Ocean University Lianyungang China
·Chromite ore processing residue COPR is a kind of Cr VI containing hazardous waste generated during the production of chromate Cr VI in COPR containing soils after aging for decades is still as high as thousands mg/kg and keeps releasing to the surrounding soil and groundwater In addition COPR particles smaller than 5 µm migrated
·Huge quantity of raw chromite ore is being mined and beneficiated in various chrome ore beneficiation plants throughout the world to cater the customized needs of various end users The mined high grade lumpy ores are directed to Ferro chrome plant after sizing to the requirement of the metallurgical operation while the low grade ore is
·Qualitative and Quantitative Analysis of Various Elements in Chromite Ore by ICP AES ZHANG Yang 1 2 ZHENG Shi li 1 WANG Xiao hui 1 2 XU Hong bin 1 ZHANG Yi 1 Laboratory of Green Process and Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of
KEY WORDS chromite ore fines; pot sinter; sintering; chromite sinter; ferrochrome 1 Introduction World s total generation of chromite ore is more than 30 million tons per annum1 at present out of which more than 80% is available in form of friable fines The fines can not be directly used for smelting in electric arc furnace EAF
·Fluxing of South African chromite ore with colemanite by Erwee Geldenhuys Sitefane and M Masipa 03BF7AEA South African chromite ores are smelted using SiO2 and CaO containing fluxes normally as quartz and limestone respectively The purpose of SiO2 is to lower the melting point of the ore while CaO is added to ensure that the
·The Koh Safi Chromite Ore Deposit is located in Afghanistan s northern northeastern end of the Kabul Kandahar ophiolite zone Sedimentary formations delayed volcanic and ultramafic rock groups including peridotites and serpentinites could all have been found in the Koh Safi area where structural discontinuities with the two trends of
Knowledge of the chromium ore minerals proper and their associated rocks forming minerals is needed to explore new chromite fields and to predict the efficiency of individual methods for the beneficiation of chromite ores It is important also to know the physicochemical properties of individual mineral fractions of chromite ores and preparation of ore or concentrates for
·The Sukinda Valley ore samples contain 50% chromite ore is economic But the >7% of CR III ore in the tailings and overburden shall warrant the future expected exorbitant Cr VI in the geo bio
