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The essence of the green process is that traditional oxidation roasting of chromite ore with so dium carbonate at 1200 C is replaced by continuous liquid phase oxidation of chromite ore in the submol ten salt medium at 300 C in a multiphase reactor BRIEF DESCRIPTION OF THE TRADITIONAL PROCESS Technology Innovations In The Smelting Of Chromite Ore …
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Previous investigations reported the formation of a molten Na2CO3 Na2CrO4 binary mixture during roasting of chromite with sodium carbonate The physical properties of the Na2CO3 Na2CrO4 liquid phase which are dependent on temperature charge and gangue composition play an important role in the oxidation reaction and may limit the chromium recovery by …
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· In the present investigation the oxidizing roasting process of chromite with sodium carbonate to prepare potassium dichromate crystals was studied in the microwave field with air by heating the chromite and sodium carbonate The chromite and sodium carbonate heated separately at 1000 °C in the microwave oven frequency GHz power kW in order to …
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Potassium dichromate is prepared from chromate which in turn is obtained by the fusion of chromite ore FeCr2O4 with sodium or potassium carbonate in free access of air The reaction with sodium carbonate occurs as follows 4FeCr 2 O 4 8Na 2 CO 3 7O 2 → 8Na 2 CrO 4 2Fe 2 O 3 8CO 2 The yellow solution of sodium chromate is filtered and acidified with …
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What will be the product for the reaction of catalytic hydrogenation of glycerol a Glycerol carbonate b Epichlorohydrine c Propylene glycol d Ethylene glycol Answer c Clarification Glycerol is easily reduced to propylene glycol 1 2 dihydroxypropane with hydrogen at pressures from 10 to 100 atmospheres and temperatures above 150° C
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Sodium percarbonate The name sodium percarbonate SPC does not reflect the structure of this oxidizing agent which is in fact a carbonate perhydrate 2 Na 2 CO 3 • 3 H 2 O SPC is very storage stable if dry the solid material has a slight vapour pressure of hydrogen peroxide leading to exchange with water or to violent reactions with oxidizable substrates …
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In a clean zirconium crucible of finely ground sample measuring less than 100µm was combined with of Sodium peroxide Na 2 O 2 and of Sodium Carbonate Na 2 CO 3 The zirconium crucible was then placed on the Claisse Peroxide Fluxer fused at 560°C temperature for a period of minutes and then finally cooled by the fluxer fans for 4 minutes
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So Why sodium carbonate not acidic or neutral salt in nature This is because when Na 2 CO 3 is dissolved in an aqueous solution it will dissociate into 2Na cation and CO 3 2 anion The cation Na is useless since it doesn t take part in a chemical reaction because of …
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Chromite ore is dried and ground and then fed into the hearth system where it is mixed with soda ash sodium carbonate and then heated to approximately 2022°F This treatment oxidizes the chromite ore converting the majority of the chromium in the ore from trivalent to hexavalent The basic reaction taking place is 4FeCr 2 O 4
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chromite in a KOH sub molten salt medium was proposed and proven to be feasible and efficient Under optimal reaction conditions slot current density 750 A/m2 alkali concentration 60 wt % reaction tem perature 150 C alkali to ore mass ratio 6 1 and particle size <200 mesh the extraction rate of chro mium reached 99% after reacting for 480 min In comparison with …
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· sodium carbonate silicon dioxide > sodium silicate waterglass carbon dioxide 2 When sodium oxide Na 2 O 15% silicon dioxide SiO 2 70% and calcium oxide CaO 10% and other oxides are heated together with temperatures up to 1000 o C insoluble silica glass forms in which all the crystalline order of the added minerals has been lost
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· In a reaction g of sodium carbonate reacted with 6 g of acetic acid The products were g of carbon dioxide g water and g of sodium Q acetate Show that these observations are in agreement with the law of conservation of mass Sodium Carbonate Acetic Acid → Sodium Acetate Carbon Dioxide Water Answer
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Chromium Wikipedia For the production of pure chromium the iron must be separated from the chromium in a two step roasting and leaching process The chromite ore is heated with a mixture of calcium carbonate and sodium carbonate in the presence of air The chromium is oxidized to the hexavalent form while the iron forms the stable Fe 2 O 3
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My research was focused on the decarbonization reactions of sodium carbonate by sodium metaborate NaBO 2 and sodium diborate Na 4 B 2 O 5 and drew a parallel between organo borate complexes and sodium metaborate occurring in the recovery boilers The primary objectives of this study is to provide information on the stoichiometry and the effect of the rate …
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Iron chromite ore is traditionally roasted in a furnace at about 1150 C with the addition of sodium carbonate leading to the following reaction 2FeO Cr 2 O 3 4Na 2 CO 3 2 Fe 2 O 3 4Na 2 CrO 4 4CO 2 The calcine is then leached to recover chromium as Na 2 CrO 4 Toxic chromium
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View Balancing chemical from STEM 101 at Bicol University Assessment 6 II Balance the following chemical reaction 1 Sodium carbonate sodium oxide carbon dioxide Na2CO3Na2O
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replacing sodium carbonate by alkali metal hydroxide The mechanism and process of alkali metal hydroxide used in chromite processing were studied in previous work in detail[12−14] In this work mechanical activation was used to improve the decomposition of chromite ore in molten NaOH and the strengthening effect was investigated by study on the changes of …
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sodium carbonate Na 2 CO 3 or soda ash from fire place sodium carbonate 10 water Na 2 CO 2 O or washing soda sodium bicarbonate NaHCO 3 or bicarb of soda or baking soda making flour rise in cakes and pikelets ammonium hydroxide NH 4 OH ammonia NH 3 dissolved in water H 2 O calcium oxide or lime CaO calcium hydroxide or slaked lime Ca OH …
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Chromates react with hydrogen peroxide The primary chromium ore is the mixed metal oxide chromite FeCr 2 O 4 found as brittle metallic black crystals or granules Chromite ore is heated with a mixture of calcium carbonate and …
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K dichro is also vsol in hot H2O but but at 0C satd soln % and crystallizes very nicely due to this low sol ion exchange between Na dichro and KCl should b feasible merck says so you can also melt a CrO3/sulfate/chloride cake and separate the Cr03 layer industrially chromite is roasted w/carbonate in air and the chromate leached out if you got your chrome by HCl/18 0 …
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· Basically I m having problems in learning so large amount of inorganic reactions Statistics show that to produce a ton of sodium dichromate the calcination process will discharge 3 tons of poisonous chromic residues That chromic residues contain 3 7% of residual $ce{Cr2O3}$ 8 11% of $ce{Fe2O3}$ and % of water soluble $ce{Cr VI }$ …
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· Sodium benzoate in soda lime heating conditions can generate sodium carbonate and calcium carbonate and benzene due to the heating condition so the temperature is not very high so the sodium carbonate and calcium carbonate does not decompose and the boiling point of benzene is K DEG C so the benzene will be volatile so chemical …
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· Carbothermic reduction of vanadium titanomagnetite with the assistance of sodium carbonate The carbothermic reduction of vanadium titanomagnetite concentrate VTC with the assistance of Na 2 CO 3 was conducted in an argon atmosphere between 1073 and 1473 K X ray diffraction and scanning electron microscopy were used to investigate the …
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Insoluble Chromium Carbonate was formed 04 Sodium ThioSulphate a No reaction initially c Heating did formed a few light green ppt On settling it was found that a white/yellow ppt a green solution was obtained Insoluble Chromium Thiosulphate is the first prediction but a different reaction could have took place On heating some white
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· The reaction for Na2CO3 sodium carbonate and HCl hydrochloric acid is 2HCl Na2CO3 > 2NaCl CO2 H2O Two moles of hydrochloric acid and one mole of sodium carbonate form two moles of salt one mole of carbon dioxide and one mole of water in an irreversible reaction Sodium carbonate also known as soda ash and washing soda is a …
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World production of chromite the main ore of chromium World production of the of chromium was 䡃 metric tons in 2022 To isolate chromium a mixture of and sodium carbonate is heated in air to form sodium chromate ironIII oxide and carbon dioxide The sodium chromate is dissolved in water and this Contact Us Get a Quote
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· A sample of chromite ore is % FeCr2O4 What mass of sodium chromate can be obtained by heating kg of the ore in air with excess sodium carbonate 4FeCr2O4 8Na2CO3 7O2 → 2Fe2O3 8Na2CrO4 8CO2
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The products are zinc chloride water and carbon dioxide Question Name the products of the reaction between zinc carbonate and sulfuric acid and …
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mixed with sodium carbonate and crude calcium carbonate as dolomite orlimestone Themixture is conveyedto arotatingfurnacewhereit is roasted A series of chemical reactions occur which are probably represented bythefollowingequations 1 4 FeOCr O3 4Na CO 3=4Na2Cr 04 4FeO 4CO 2 4Na2Cr204 4Na CO 602 = 8 …
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Completion of the reaction was indicated by the cessation of the rise of gas bubbles in the melt Silica alumina ferric oxide titania chromic oxide manganous oxide lime and magnesia were determined by the scheme of analysis shown below Ferrous oxide was determined by the method of Gilbert 1943 1 Fuse gm chromite with 5 gm sodium carbonate …
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processing react with the solution form water soluble hydrocarbonate salts and exit the mineral structure Further due to the high temperature they decompose with the formation of less soluble carbonates which serve as the basis for the formation of a new mineral structure The phase composition of chromite ore after the activation with sodium bicarbonate is shown in the table …
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3 with various carbonates was analyzed by far infrared far IR spectroscopy spectral region 700 25 cm mium III oxide Cr1 Non toxic Cr 2 O 3 was oxidized with potassium sodium and calcium carbonate respectively to toxic Cr VI and Cr V compounds during thermal treatment at 1000 8C In reverse thermochemical treatment of Cr 2 O 3
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