Aravamuthan, V.

Kamaludeen, M.

Ranganathan, N.G.

Venugopal, K.

IR@CECRI

OoVel'DUDt ot India, The Patent Ottloe, 814, &oba17a J... leh. .... R• .s. Calcut'--17. c__ tete .,eoltloatloD lo.~. .dated .tb M", lW76. lppllcatloq and PIVY1.1oDal .peeltl .......• o.•t tWcaJ/1W18 dated ab.., 117....... t..... ot , ••• pl..... __ 1I10.'lon (d.. rt1 ... on 1.4'b IMIl'" 1~8.?!DC..,"c.+ .IQ4u: at ao~t8Aoe - CLYIII(&)j.Inteftla'1ODal 01... 1110at1on - C • 4 :vao• A lflii 11I1'HOD !'Oil IBI ·PRODUCUOI W HUt. &LLOf OFALUNIlfIOK-K1C11aItJlP.COOIfCIL OlP SCIBMTIPIC • IRaJftRIlL _lARCH, Raft Mal'I,I.. Delbl-1, ID41a, an Indian 'reliltered' bodT inoorporat .. ,Gilder'" ,be ....... Re.i8tratlon ot .Bool.tle. lot (lct XIIof 1860). .tbe tol101d.n1 .p,eo1floatlon d e.orlbe. tbe dattlN ot 'ti't18lilY••fbi. 1. aD inyention bJ' KtJPPUSVAMIvaUOOPlLlIf,IOI'enti.t, VBIltA.RAOH1VA~AVAHtmlIJl, SOl.nti.t, MOHAMBD.. .J[1IULt1~, Senlor SOlentitic '.alatant, lfBDtJlUlWf OOPAL&IIWIGMl!BAIf,IWl10r 8~1·.Dt1tiO l.al.taftt, all troll Oen~ra1. ., .&1.. tnoa..!oal ....... b In.tlttate, EarallDa41-683 006,if.l1 -ada, I~1a. all ID41a1'l'.~ '.,.E [} """-.t.,f):!)r~r....· ril,.~·Aoo-'· t",...,....This'invention relates to a new method for theproduction of master alloys of aluminium-magnesiumIt would help in the imp~ovement of the existingpcocess as it eliminates the need for magnesium metalproduction and separately melting constitutents viz.,magnesium and aliminium under suitable flux. It iseasier to prepare aluminium. magnesium alloys by thismethod than'by mixing the components which must take intoaccount the difference 1n densities between the twometals while preparing the alLoy and th~ likely -loss tooccur due to oxidation and surface rising of magnesiumin the cQnventio~al method.The object of this invention is to discharge. ,magnesium ions on to a.molten cathode of aluminium froman anhydrous magnesium chloride containing bath""suCh asby~product anhydrous magnesium chloride or from denydratedcarnallite.To these ends, tbe invention broadly consists 1nIut1l1s1ng anhydrous magnesium chloride as electrolyte 1n2143687comh:f.nat1.on \.fitl'l potassIum chloride emplofing moltenaluminium as cathode and graphite as anode in a ~1mpl.non-diapilragm (lle~trolyt:icee11 beated internal1y andthe temperature being also naintain~d by the passageof electricity.The following examples serve to illustrate theinvention.Example 1~Flee t 1'0lyteRatioAmperageVoltageDuration of electro~sisTemperaturewt.of aluminium takenMagnesium percentageof alloyCurrent efficiencyWt.of allqy obtainedExample QElectrolyteRatioAmperageVoltageDuration of electrolYsisWt.of aluminium takenTemperatureMagnesium percentageof alloyCurrent efric1enc~Wt-of alloy obtainedExample 3ElectrolyteRatioAmperageVoltageDuration of ~lec~rolys1sTem'geratureWt .of allumln1um takenKCL+MgC121 : 130010-11 V4 hours700-75'OoC1.5 kg26%82%1.7 kg'KC1+MgC121 :130010-11V7 hours2 kg700-?5'OoC31%87.9%2.7kgKl1+MgC121 :1'30010-11 V7 h.ours700-?5'OoC'2 kgMasnesium percentae.of alloyCurrent etficiencyWiuof a1101 obtainedIn all tbe above ex~rillttnts the percentage of magnesium vas. .eetimated by ana1rsi8 and aome all07 Va8 lo.t dur1ft1 collectionfrom tbe cell.'The following are the main advantages of tQeinventions-A new method for the production of master all~haa been invented by d1scharg1ng _gne-1U1l metal froiDe.nh7drous magnesium chlor1de containing electrolyte on'to molten allm1n1um in fUSE»d salt bath.Dated th1s 27tb day of April 1975'sd/-Asst.Patents Officer'Council of Sc1entific & Industrial ResearchTHB PAT8l'i'l lC! ).8'70COMPLBra IPICIrICA1'IOI8101'101 10". If., MJmIOD POR THB PRODUCTION OF MAST. ALLOY OFWt'MINIUM MAmaIUM"COUNCILQIP8CIINTIrIC AND IlfDUSTRIAL RB8BARCH, Rafl Marl,X", Delhi-l, Indian, an Indian "patered body inoorporatedunder ttie Rqietratlon ot So01.t1 •• lot (let XXIof 1860).. .Th. follow1nl spec1f1cation partloular~ desoribes an4a8c:lerta1nsthe nature or this 1nvent10n and· the lIanner 1n which1t 18 to be pertormed I-This 1s an 1nvention by KUPPUSWAMY VifiUGOPALAN, Sc1entist,Va:RARAGH1VA. ARAVA M01'HAN, Soientist, MOHAMAD KAMlLtJDB8N,Sen10r SCientific Assi.tant and NBDUKA.RAM OOPALAN RANOANA1'HlN,JWlior Soient1fic Assistant, all or the Central ElectrochemicalRe.earcb Ina1tut., Kara1lmd1-623006,Tamll Nadu, Indla, allIndian c1t1zens. 05·14-~687The invention relates to production of master alloyof aluminium-magnesium which is useful 1n the aluminiumfoundries as well as in pyrotechnic works. Alumlnlum-m,asnesium alloy is also used in th.e construction ofe'q1Jipm~nt suitable for desa~ination of sea water.Hi therto the master alloy has been prepared by directcombination or the respectiv~ metal viz. , aluminium andmagnesium by combining them under proper condition oft~emperature under suitable flux. There is not methodavailable for the prpparation of thp master alloy ast;he present invented method.Drawbacks connected with hitherto known processes/devicesThe invented method would help in the improvement oft~he existing process as it eliminates the need for magnesium.metal production and separately melting constitutents vi_.,magnesium. and aluminium under suitable flux. It is easier·to prepare aluminium-magnesium alloy by this metho<1 th.nby mixing the components which must take into account thedifference in densities between the two metals whilepreparing the alla,y and loss likely to occur due to'axidltion and surface rising of magnesium in the conventionalIlet.hod.The main ob,ject is to prepare the master alloy ofaluminium-magnesium by fused salt electrolys:f.s.The main principle involved in the- invention 1s the..d~scbarge of magnesium ions on to a molten eathode of aluminiumfrom a bath containing anhydrous magnesium chloride.The new result floWing from the new finding:By the electro~ti~ method it was posslbl~ to preparethe master alloy of alum~n1um.magnes1um with a maxireumI!\&r ,,"1U1l content of 33-35'%.143687The prese.nt invent ion COns~8ts of a pr~eSs-Ior the.: ~ ". f ,.~ tprepara.tlon of master alloy of alQ*nium-ma~esiuJl whiohcomprises the use of molten aluminium metal as cathode,suitable composition (1:1 by weight) of anhydrous magnesium'chloride, potassium chloride electrolyte with grap~t.anode electrode, wherein the magnesium 10n fro'm theanhydrous magnesiumohloride get,s discharged on to themolten cathode of aluminium, to form the master a1101 ofaluminium-magnesium (3' to 35~ magnesium) and employ1Dgoe,thode current density of 100 amp/sq~dm... and anodecurrent density of 400 ampe/sq.cJ., at 700-750°0.,Flow sheet of the prooess i8 attaohed.A few typical examples' to' illustrate how the inventionis carried out in actual praotice'Example 1Electrolyte Iae.tioAmperageVoltageDuration of electrolysisTemperatur eWeight of aluminiurr. takenMagnesiumpercentage of alloyCurrent eff1cie:noytfeight of a11\)y obtainedCurrent density cathOde,Il " anodeExample, 2Electro lyt eRatioAmperageVoltageDuration of e1ectrolys1sWeight of aluminium takenT@lI.peratureMagnesiumpercentage of aJ.loyCurrent efficiencyWeight of alloy obtainedCurrent d&nsity cathode" " anode_ample'EleotrolyteRatioAmperageVoltage__1>~_i.on of elA~i;rnlyeif\• •••••• ••• ••• •••••• ••••••••·.'.• ••••••••• ••• •••••• •••• ••• •••• ••••• ••• ••••••••••••••• ••XC1 + MgC~2 '1:1 by weJ.gJrt'00 amps·10-11 V4 hours700-750°01.5 kg26~82%1.7 kg .too amp.l.sq.dID.400 amp/sQ..d ••XOl + Mg011:1 by weiiht300 amps ,lO-11 V7 hours2kB700-75041031"2.7 kg'2.7'kg100 amp/sq.d••400 emp/sq.da.XCl + JlgC11.1 by weiiht:5QOe.zpelO-U VA ..."n....Temperature •••Welght ot alwnin1ua takenMagnesium perteq.tqe of ,alloy . . >Current etticiencyWelght ot alloy obtainedCurrent density cathodeII n anod."700.7500C2 kg34~89.26%2.85 kg100 amp/sq.dm.,400 amp/sq.dID.In all the above experi_nts the percentage o.t llagae.iWll val •• tima-ted by analysis and IOme alloy was 10"st during· collection trolD theoel1.The main advantage or the invention is that a master a1l07Qt a1um1n1~magnesium containing 33-35% magnesium could easily beprepared by the electrolytic method ot discharging magnesium ion onto molten aluminium cathode. This overcomes the difticulties ot oxt.-. .d,ation and reaotion ot nitrogen on the magnesium due to densitydifferences lnd surface rising ot magnesium whicb are normally ex-pected in t~e conventional metbod. Considerable magnesium loss whichhas been normally observed in preparing aluminium-magnesium alloycGntaln1ng above 1O~ magnesium in the conventional method has alsobeen awlded ln this new method.We claim:-:1. A process tor the production ot master alloy of magnesiUDaluaiD1um containing a max1mum ot 33-35" magnesium metal which ccslsts in discharging magnesium ion on to molten aluminium cathode:trom a fused salt e1ectrolyte containing 1:1 weight ratio of magnslwa-potassium chloride at 700 to 750°C and current density (catb100 amp/sq.4m., and anode 400 amp/sq.dm.), carbon/gra-phite anode Isucttnc of chlorine to obtain the desired product.2. A process for the production of master alloy of magnes1um-aluain1wa substantlally as herein betore described.Dated this 28th daY'of A"ril. 1976.Patents OfficerCouncil of Scientific and IDll~slrlal Research •.--~ rt(X~°0u.CJuJ oZ -1--~~~ a >-...I ..Jo ~())-~ 5j I2 lOz 1~:J lU..J0%\1> z<~ j-~ -cI)Q.~o lXR":::lo..J.,J 9&1)2~dJ :I:-tD .un. )(::) 0l ..J .... W........l.L tt0 0WI&.I~~...'lI)0 :i~11.1::»w «encn~ IIIII.~:7::;:)~ ..J 00- ~acn_ ~ ...J~...QUIlt ... UJ ..J)-%0 U U~Q 0:s::~..J 'C w~~~ 0~~ Ir-f- >- .... ...~~9 en, 00 ... 0 I0 ~ 0fii a ..J ,-f-~;::) DoU 0u~E~ w ~ ~....J~..W ~ "~~1'..'Z~U')U)~d)~I&J §:lw ~=0 :)0 0tn_ a·eX :g«net ,..~o~3 :Z~..J :;tK~ z %<~uriI&.lVit....o. .If)rt... '%.;.:... ..~l~

A new method for the production of master alloy of aluminium-magnesium

Abstract

Similar works

Full text

Available Versions

IR@CECRI