why is cryolite added to the mixture

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Reactions of metals

and this is expensive To reduce costs, powdered aluminium oxide is dissolved in molten cryolite This ionic compound melts at a lower temperature than aluminium oxide, reducing costs...

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Why is alumina added to cryolite in the electrolytic ,

Mar 18, 2018 0183 32 Cryolite lowers the fusion temperature from 2050 degree C to 950 dgree C and enhance conductivity as pure alumina is also non conductor of electricity And cryolite also act as a solvent for the electrolytic mixture...

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Why is cryolite added to bauxite , Homework Help ,

In the process of electrolytic reduction Alumina is mixed with cryolite and Calcium Fluoride CaF2 and the mixture is melted in Iron cell Alumina has 2703K melting point and is a bad condutor of electricity but when mixed with Cryolite an CaF2 the mixture becomes a good conductor of electricity and its melting point is decreased to about 1173K to 1223K...

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Aluminium Extraction questions? Yahoo Answers

Nov 13, 2009 0183 32 I need help answering some questions 1 Explain why the cryolite and aluminium oxide mixture must be kept molten for electrolysis Is it something to do with the particles and that they can move around better than in a solid? 2 Why is a mixture of aluminium oxide and cryolite used, rather than aluminium oxide alone? 3 Write half an equation to show the reaction at a positive and a ....

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aluminium US aluminum

Extraction and uses of aluminium Note You may find all sorts of other formulae given for the product from this reactionThese range from NaAlO 2 which is a dehydrated form of the one in the equation to Na 3 Al OH 6 which is a different product altogether What you actually get will depend on things like the temperature and the concentration of the sodium hydroxide solution...

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Electrolysis Flashcards Quizlet

Manufactured by electrolysis of molten mixture of aluminium oxide and cryolite Aluminium forms at the negative electrode and oxygen at the positive electrode Positive electrode made of C02 which reacts with oxygen= C02 Aluminium oxide melts At over 2000 C which would need tons of energy mixing it with cryolite allows it to melt at over 850C....

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CHEMISTRY MULTIPLE CHOICE QUESTIONS

Why is an atmosphere of argon used around the cathode? steel cathode atmosphere of , why is cryolite added to the aluminium oxide? B c D , for the production of aluminium metal by the electrolysis of a mixture of bauxite, A1203, and cryolite, Na3AlF6...

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Why are Cryolite and fluorspar added to the electrolytic ,

Why are Cryolite and fluorspar added to the electrolytic mixture containing pure alumina? Ans Cryolite and fluorspar lower the fusion temperature of the mixture from 2000 0 C to 1000 0 C thereby saving electrical energy They increase the conductivity of the mixture They increase the mobility of the fused mixture,...

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What are electrolytes and what happens in electrolysis ,

Metals are found in ores combined with other elements Electrolysis can be used to extract a more reactive metal from the ore Bioleaching is used to extract small quantities of metals from mining ....

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Cryolite Na3AlF6

Exposure to cryolite dust may result in skeletal fluorosis Eight male workers at a cryolite concentrator participated in a 4 day study after 5 days of vacation Dust exposures were 016 to 212 mg/cu m Urine was collected before work began and during two 4 hr periods Preshift urine fluoride concentrations increased during the week...

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Use of cryolite and fluorspar in electrolytic reduction of ,

Cryolite \ce Na3AlF6 and fluorspar \ce CaF2 are added to alumina to lower the temperature of the mixture from \pu 2000 176 C to about \pu 900 176 C and also to increase the conductance But my question is about the specific effect these compounds are producing I mean, out of the two mentioned effects, which compound is doing what?...

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why use cryolite in electrolytes use in pure alumina ,

Give two reasons why cryolite is used in the electrolysis of aluminium oxide The mixture of cryolite and aluminium oxide has a lower melting point than pure aluminiumoxide , Molten cryolite serves as a solvent for the molten aluminium oxide and increases the conductivity of the solution...

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Why is pure aluminium oxide mixed with cryolite before ,

There are usually other elements added as well, for various properti What is golds hardness? Gold on the selves is actually an amalgam mixture of several metals so it is mixed with aluminium ....

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What does Cryolite do to the melting point of Bauxite ,

Jan 28, 2011 0183 32 With a small percentage of alumina dissolved in it, cryolite has a melting point of about 1,000 176 C 1,830 176 F Some aluminium fluoride, AlF3 is also added into the process to reduce the melting point of the cryolite-alumina mixture The links below will give you further information...

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Fire Assay Procedure

Fire assay procedures uses a combination of intense heat 1900 176 F that is produced by a furnace, dry reagents called fluxes, and bone ash containers called crucibles and cupels One uses this combination to fuse the fluxing agents and to isolate the precious metals The ability to fire assay a substance relies on a number of facts...

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What is the function of cryolite in the extraction of ,

Why is cryolite used in the manufacture of aluminium? , It is added into the mineral bauxite a mixture of hydrated Aluminium Oxide Al2O3 and hydrated Iron Oxide Fe2O3 and it will be ....

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Chemistry blog Extraction of aluminium from bauxite

Sep 01, 2012 0183 32 -Pure cryolite has a melting point of1,012 176 C 1,854 176 F -With a small percentage of alumina dissolved in it, cryolite has a melting point of about 1,000 176 C 1,830 176 F -Some aluminium fluoride, AlF3 is also added into the process to reduce the melting point of the cryolite-alumina mixture...

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Extraction of aluminium from bauxite ore Mastering ,

The extraction of aluminium involves two steps that is, purification of bauxite by Baeyer s process and electrolysis of alumina 1 Purification of bauxite by Baeyer s process In the Baeyer s process, the bauxite ore is heated with concentrated NaOH solution under pressure Aluminum is purified by leaching method The alumina dissolves as sodium meta aluminate...

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why cryolite and fluorspar are mixed with pure alumina ,

Cryolite and fluorspar lower the fusion temperature of the mixture from 2000 \circ C to 1000 \circ C thereby saving electrical energy They increase the conductivity of the mixture They increase the mobility of the fused mixture...

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Does cryolite change the electrolysis of aluminium, if so ,

Mar 21, 2014 0183 32 6 why is it cheaper to use a molten mixture I d aluminium oxide and cryolite rather than just molten aluminium oxide? Aluminum oxide melts at well over 2000C But when mixed with cryolite which melts at a little over 1000C, the cryolite-Al2O3 mixture melts at a little less than 1000C, using much less energy than melting Al2O3 alone...

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Extraction of aluminium aluminum recycling sodium by ,

The mineral cryolite is added to lower the melting point and dissolve the ore So the electrolyte is a mixture of molten aluminium oxide and cryolite minerals So the electrolyte is a mixture of molten aluminium oxide and cryolite minerals...

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Cryolite, synthetic powder Solvay

The molten salt mixture also prevents gases from entering the bath, reduces heat losses from the surface of the molten metal and absorbs impurities which rise to the surface of the melt Suitable salt covers are fluxes containing cryolite or sodium fluorosilicate...

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In the Extraction of Aluminium Write the Function and ,

Solution In the Extraction of Aluminium Write the Function and Formula of Cryolite in the Extraction of Aluminium Concept Occurrence of Metals - Extracting Metals Towards the Top of the Activity Seri...

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Why cryolite and fluorspar are added to the electrolytic ,

May 01, 2018 0183 32 Find an answer to your question Why cryolite and fluorspar are added to the electrolytic mixture during reduction of Al2O3? 1 Log in Join now 1 Log in Join now Secondary School Chemistry 5 points Why cryolite and fluorspar are added to the electrolytic mixture during reduction of Al2O3? Ask for details Follow Report by Simranraturi4293 ....

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Give reasons for the following i Alumina is dissolved ,

Nov 01, 2018 0183 32 Give reasons for the following i Alumina is dissolved in cryolite for electrolysis instead of being electrolysed directly ii Zinc oxide can be reduced to metal by heating with carbon but Cr 2 O 3 cannot be reduced by heating with carbon...

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why is cryolite added to the bauxite ore in the ,

Purification of Bauxite Ore Bauxite contains impurities such as sand and iron oxide , So, to reduce the melting point of alumina cryolite and fluorspar are added in it The mixture of alumina, cryolite and fluorspar is then put into a specially made electrolytic cell The electrolytic cell is made up of iron which is lined with a layer of ....

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CHEMISTRY MULTIPLE CHOICE QUESTIONS

Why is an atmosphere of argon used around the cathode? steel cathode atmosphere of , why is cryolite added to the aluminium oxide? B c , for the production of aluminium metal by the electrolysis of a mixture of bauxite, A1203, and cryolite, Na3AlF6...

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Aluminium cryolite , Hoope s process, Bayer s process

Cryolite also increases the conductance Electrolysis of Al2O3 is carried in an iron box It is lined with carbon which acts as cathode Graphite acts as anode These are dipped in electrolyte A mixture of Al2O3, cryolite and fluorspar acts as electrolyte A controlling lamp is placed parallel to the cell...

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WHY MIXTURES DON T HAVE FIXED MELTING AND BOILING POINT ,

Jun 12, 2009 0183 32 WHY MIXTURES DON T HAVE FIXED MELTING AND BOILING POINT? Follow 3 , cryolite Na3AlF6 are added to aluminium oxide when heating to turn it to molten form , The concentration of the solute affects the boiling point For example, salt water Add more salt, and the mixture will freeze at a lower temperature Anonymous 1 decade ago 0...

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