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US3852059A

A method of producing sodium chromate from chromite ore which involves mixing the ore with sodium carbonate and a refractory diluent pelleting the mixture using an aqueous solution of sodium hydroxide potassium hydroxide sodium aluminate sodium silicate sodium chromate or mixtures thereof drying and roasting the pellets under oxidizing conditions then disintegrating and extracting the pellets to obtain an aqueous solution of sodium chromate Get price

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)250$7 212)1D U2 1D 2 0(/7$1'7+(63 12'$/ '(20326 7 212

The chromite ore and the salt mixture of sodium carbonate - sodium chromate were mixed in the stoichiometric ratios In the sodium chromate - sodium carbonate mixture the ratio of carbonate to chromate was varied between 0 and 80 % with an increment of 20 Get price

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Manganese in Mineral Chromite Ferrochrome Slags and

The addition of sodium carbonate to the flux will slow the reaction of metal and peroxide Iron burns very fast and very hot chromium burns much more slowly If a sample of ferrochrome were as high as 80 pct chromium moderation with sodium carbonate would probably not be necessary as long as the sample and flux were well mixed Get price

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CHEM BRAINS Inorganic Problem from d

Dec 24 2012The chief ore of chromium A on roasting with molten sodium carbonate gives compound B Compound B on acidification with conc H2SO4 gives compound C Compound C on treatment with KCl gives compound D Identify A B C and D Explain the reactions 3 A compound of chromium in which chromium exists in + 6Get price

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Kinetics of Reaction of Roasting of Soda Ash and Ilmenite

Kinetics of Reaction of Roasting of Soda Ash and Ilmenite Ore Concentrate for Formation of Sodium Titanates I A Nafeaa 1 A F Zekry 1 M G Khalifa 2 A B Farag 1 N A El- Hussiny 3 M E H Shalabi 3*) 1 Faculty of Science Helwan University Egypt 2 Get price

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roasting and leaching process for chromium

Organic acid leaching Extraction of titanium and chromium oxides may be achieved via roasting the respective minerals with alkali at high temperatures followed by water and organic acid le aching In this study sodium and potassium hydroxides are used as alkali for roasting of chromite ores and ilmenit e mineral concentrates The Get price

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Activation pretreatment of limonitic laterite ores by

Activation pretreatment of limonitic laterite ores by alkali-roasting method using sodium carbonate Abstract Activation pretreatment of Cr-containing limonitic laterite ores by Na 2CO 3 roasting to remove Cr and Al as well as its effect on Ni and Co extraction in the subsequent pressure acid leaching process were investigated Get price

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What Is The Ore Of Chromium

Chromite The only mineral ore of chromium metal Chromite is important because it is the only economic ore of chromium an essential element for a wide variety of metal chemical and manufactured products Many other minerals contain chromium but none of them are found in deposits that can be economically mined to produce chromium Get price

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Alkali Roasting of Chromite

Chrome chemicals are commercially produced by the alkali roasting of chromite ores with sodium carbonate Results of tests conducted in a laboratory furnace indicated that the sodium carbonate reacted rapidly with part of the gangue material to form a metastable intermediate that later reacted further with the chromite Get price

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chromite ore rosting plant

Chromite Ore Processing Plants Star Trace Pvt Ltd Chromite Ore Processing Plant Star Trace offers turnkey solutions for chromite ore processing plants We are one of the leading project suppliers for chromite ore plants and we work closely with our customers to fulfill their specific needs for a customized packaged solution Get PriceGet price

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A Cr⁶⁺⁻ Free Extraction of Chromium Oxide from Chromite

many other chromium chemicals relies on the alkali roasting of chromite in oxidising conditions which yields water soluble sodium chromate (Na2CrO4) Silica is often present in chromite and it can vary between 2 wt % in S African ores and more than 8 wt % in lower grades of chromites used for chemicals manufacturing Get price

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Leaching With Caustic Of The Chromite Plant

Roasting Between Chromite Ore And Sodium Carbonate Leaching with caustic of the chromite plant These plants sequester the sodium carbonate they absorb from alkali soil into their tissues Chromite ore is heated with a mixture of calcium carbonate and sodium Get price

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Effects of sodium roasting on the leaching rate of boron

Sodium roasting technology is a method that adds sodium agents (for example sodium carbonate sodium sulfate and sodium hydroxide) in mineral raw materials and uses the characteristics of sodium agents which will be decomposed into Na 2 O Na 2 O is of higher leaching rate and liable to combine with other elements to form soluble sodium salts Get price

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chrome ore reaction with sodium carbonate in rotary kiln

Aluminothermic reaction process for chromium ore chrome ore reaction with sodium carbonate in rotary kiln chrome ore or aluminothermic reaction or by Know More direct fired rotary kiln working principle The Soda-Ash Roasting of Chromite Ore Processing Residue for Get price

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SODIUM DICHROMATE LISTING BACKGROUND

After roasting the ore typically contains 20-40% hexavalent chromium as sodium chromate and 10-20% trivalent chromium as Cr 2 O 3 21 The chromite ore exiting the hearth is quenched with water in the facility's quench tank and the resulting slurry goes through a series of rotary filters to filter and purify the sodium chromate Get price

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METHOD FOR THE CONVERSION OF CHROMITE ORE TO SODIUM

Jun 11 1974A method of producing sodium chromate from chromite ore which involves mixing the ore with sodium carbonate and a refractory diluent pelleting the mixture at a temperature of at least 36 C using a pelleting liquid which may be water or water containing dissolved substances drying and roasting the pellets under oxidizing conditions then disintegrating and extracting the pellets to obtain an Get price

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metallurgy

As a comment of Karl's message I would like to add that chromite $ce{FeCr_2O_4}$ is the most important Chromium mineral When mixed with $8$ times its weight of sodium carbonate and heated to high temperature $ce{Na_2CO_3}$ melts at $850$ C and reacts with chromite and air according toGet price

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Leaching With Caustic Of The Chromite Plant

Roasting Between Chromite Ore And Sodium Carbonate Leaching with caustic of the chromite plant These plants sequester the sodium carbonate they absorb from alkali soil into their tissues Chromite ore is heated with a mixture of calcium carbonate and sodium Get price

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roasting between chromite ore and sodium carbonate

Sodium chromate roasting between chromite ore and sodium carbonate # Sodium chromate is the inorganic compound with the formula Na2CrO4 It exists as a yellow hygroscopic solid which can form tetra- hexa- and decahydrates It is an intermediate in the extraction of chromium from its ores Get price

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Metallic sulphide and sodium carbonate interacting

The interaction of nonferrous and iron sulfides with sodium and potassium carbonate is little -studied Patent 4 541 993 (USA) offers joint sulphatization roasting of sulphide ores and carbonate or bicarbonate of alkali metals for extracting non-ferrous metals (copper nickel cobalt and zinc) Studies of the behavior of PbS Cu 2 S Bi 2 S 3 FeS 2Get price

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ISC Chemistry Question Paper 2014 Solved for Class 12

Sep 03 2019(a) Preparation of potassium dichromate from chromite ore involves the following steps (i) Conversion of chromite ore to sodium chromate It is achieved by roasting finely powdered chromite ore with sodium carbonate and quick lime in excess of air Get price

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When a chromite ore (A) is fused with sodium carbonate in

When a chromite ore (A) is fused with sodium carbonate in free excess of air and the product is dissolved in water a yellow solution of compound (B) is obtained After treatment of this yellow solution with sulphuricacid compound (C) can be crystallised from the solution Get price

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Formation of Chromium

Dec 01 2016Previous investigations reported that when chromite is roasted with soda-ash a molten salt containing chromium which is mainly composed of sodium carbonate and sodium chromate (Na 2 CO 3 -Na 2 CrO 4 binary mixture) forms under typical roasting conditions The Get price

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A Cr⁶⁺⁻ Free Extraction of Chromium Oxide from Chromite

many other chromium chemicals relies on the alkali roasting of chromite in oxidising conditions which yields water soluble sodium chromate (Na2CrO4) Silica is often present in chromite and it can vary between 2 wt % in S African ores and more than 8 wt % in lower grades of chromites used for chemicals manufacturing Get price

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Rapid Analysis of Chromite and Chrome Ore

RAPID ANALYSIS OF CHROMITE AND CHROME ORE 35 potassium bisulfate is used for the gravimetric determination of magnesia as the phosphate PRECISION AND ACCURACY OF CURRENT METHODS OF ANALYSIS Hartford (1953) has provided some valuable information on the precision of current methods of analysis The data on the first analysisGet price

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calcination or roasting of ore

This process is known as roasting Calcination In this process the ore is heated to a high temperature in the absence of air or where air does not take part in the reaction Usually carbonate ores or ores containing water are calcined to drive out carbonate and moisture impurities The differences between roasting and calcination are given Get price

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When a chromite ore (A) is fused with sodium carbonate in

When a chromite ore (A) is fused with sodium carbonate in free excess of air and the product is dissolved in water a yellow solution of compound (B) is obtained After treatment of this yellow solution with sulphuric acid compound (C) can be crystallised from the solution Get price

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When a chromite ore (A) is fused with sodium carbonate in

When a chromite ore (A) is fused with sodium carbonate in free excess of air and the product is dissolved in water a yellow solution of compound (B) is obtained After treatment of this yellow solution with sulphuric acid compound (C) can be crystallised from the solution Get price

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how to separate chromium from chromite

The primary chromium ore is the mixed metal oxide chromite FeCr 2 O 4 found as brittle metallic black crystals or granul 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 Get Price Chromite - Get price

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Where Is Chromium Ore Normally Found

2019-7-28 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 sodium carbonate in the presence of air the chromium is oxidized to the hexavalent form while the iron forms iron(iii) oxide fe 2 o 3 Get price

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Comparative study of alkali roasting and leaching of

In this process the extraction of chromium is achieved via roasting the mineral with alkali salts (usually sodium carbonate) Chromite ore and sodium carbonate are roasted at temperatures ranging between 900 C and 1200 C in oxidative atmosphere (Antony et al 2001) Get price

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chromite reaction sodium carbonate

roasting between chromite ore and sodium carbonate Sodium chromate is produced commercially by roasting chromite ore with sodium carbonate or with sodium carbonate and calcium oxide and leaching to dissolve the sodium chromate After treatment to remove hydrated alumina the sodium chromate solution is either marketed directly or evaporated to produce hydrated or anhydrous crystals Get price

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Alkali Roasting of Chromite

Chrome chemicals are commercially produced by the alkali roasting of chromite ores with sodium carbonate Results of tests conducted in a laboratory furnace indicated that the sodium carbonate reacted rapidly with part of the gangue material to form a metastable intermediate that Get price

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The Effect of Chromium on the Roasting Process of Vanadium

Metals 2016 6 157 8 of 9 5 Conclusions The mechanism of chromium on the roasting of vanadium slag has been given and the effect of different contents of chromium on the conversion rate of vanadium in vanadium slag sodium-roasting has been studied Get price

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