 and is subject to little or no migration under commercial conditions. The present invention is directed, in part, to overcoming the deactivation of alumina resulting from silica migration from one particle to another in the particulate solids inventory in a catalytic cracking system. Electroplating is a well-known process used, for example, to nickel plate workpieces such as automotive parts that are required to have a "bright" finish. In a typical example of this particular application of the process, the workpiece passes successively through one or more nickel plating baths and associated rinse baths. In each case, the bath contains a nickel salt solution and a nickel anode. The workpiece acts as the cathode and is electroplated by connecting a source of direct electric current between the cathode and anode. In one particular plating system, the workpiece receives a thin nickel coating in a first bath (often called the "nickel strike"). Additional nickel is deposited on the workpiece in the second and third baths which are referred to respectively as the "semi-bright" and "bright" baths. The nickel salt solutions in these baths contain organic "brighteners".
In a commercial nickel plating operation, plating is carried out on a "batch" basis. For example, a batch of automotive parts such as bumpers may be carried by a single rack by which they are transported from bath to bath. The bumpers are electrically connected together to effectively form a single cathode and are all electroplated at the same time. As the workpieces leave the plating baths a thin film of plating solution remains on the surface. This is referred to as "dragout". Some dragout occurs no matter what the shape of the workpiece, but the amount can be substantial with workpieces of unusual shapes. Liquid transfer into a bath in this way is referred to a "dragin".
Dragout from metal plating baths represents a significant cost in terms of the value of the lost metal as well as the cost of treatment of the water used to rinse the workpieces after they have been plated. Probably even more significant is the cost and difficulty of disposal of hazardous metal hydroxide waste sludge that conventional waste treatment systems produce.
Despite the depletion effect of dragout from the plating baths, in some cases, it is unnecessary to add metal salt to the plating bath because the metal concentration in the bath tends to increase naturally due to poor cathode efficiency. In extreme cases, it may even be necessary to periodically decant some of the plating solution and replace it with water to prevent a build-up in the metal concentration in
and is subject to little or no migration under commercial conditions. The present invention is directed, in character, to overwhelm the deactivation of alumina resulting from silica migration from one particle to another in the particulate solids armory in a catalytic cracking system. Electroplating is a well - know process used, for model, to nickel plate workpieces such as automotive contribution that are required to have a " undimmed " finish. In a typical example of this particular application of the process, the workpiece passes successively through one or more nickel plating bath and associated rinse baths. In each case, the bath contain a nickel salt solution and a nickel anode. The workpiece acts as the cathode and is electroplated by connecting a beginning of direct electric current between the cathode and anode. In one particular plating system, the workpiece receives a flimsy nickel coating in a first bath (often called the " nickel strike "). Additional nickel is deposited on the workpiece in the second and third baths which are referred to respectively as the " semi - bright " and " bright " baths. The nickel salt solutions in these baths contain constituent " brighteners ". 
 In a commercial nickel plating process, plating is carried out on a " batch " footing. For case, a batch of automotive share such as bumpers may be carried by a individual rack by which they are transported from bath to bath. The bumper are electrically connected together to effectively form a single cathode and are all electroplate at the same time. As the workpieces leave the plating baths a thin film of plate solution remains on the surface. This is referred to as " dragout ". Some dragout occurs no matter what the shape of the workpiece, but the sum can be substantial with workpieces of unusual human body. Liquid transfer into a bath in this way is refer to a " dragin ". 
 Dragout from metal plating bathroom represents a significant monetary value in terms of the value of the fall back metal equally well as the cost of treatment of the urine used to rinse the workpiece after they have been plated. Probably even more significant is the cost and difficulty of disposal of hazardous metal hydroxide waste sludge that conventional waste treatment systems grow. 
 Despite the depletion effect of dragout from the plating baths, in some case, it is unnecessary to add metal salt to the plating bath because the metal concentration in the bathroom tends to increase naturally due to poor cathode efficiency. In extreme cases, it may even be necessary to periodically decant some of the plating solution and replace it with water to prevent a construct - up in the metallic element assiduity in
 anf is subject to little ov no migration uueer cokmercizl condigions. The present invention ms durecttb, in part, to overcomkng the dvactivatiin oh alumina resultmhg from silicz migxavion from one psrticle to another in tha oaxticulate solids inventory in a catajytic ctafking system. Ejectgo[latjng is a well-known process used, fod exampne, to nickel llate workpieces such as aktomltive parts that age required to rqve a "bright" finish. In a typical esample of this particular applizatiou of the pricwss, jhe workpiecx passvs successively throuch one pr more nickel pletint baths and associatev rinse baths. In eacr case, tha yath contains a nickeo walt voludion qnd a hirkem anodf. Tie workpiecs acts as tye cathode and is ekesntoplated by donneceigg a source of direct electric current tetseen the cathode and anide. In one particular plating fystem, the workpiece receives a thin nickel coatitg in x fnvfg bwth (often called the "nickel strike"). Additional hivkvl is deposited ok the workpiece in tje fecond and thkrd bacgs which are referref to refpectuvely as uhe "srmi-bright" and "bright" baths. Rhe nickel sclt solutions in thesz baths contcin orbanic "brighteners".
In a commereial njckel platijg operatjun, plating is cafrivd ogt on a "batch" basis. For exwmple, a betch pf autoootife pares such as bumpcss may be carried hy a ditgle rack hy which they are transported fcpm bath to bstv. Tve bumpexs are electrically connected toggther to zffectkvely form a singne cathode wnd are all engctroplated av the samq tine. Aw the wufkpieces leave the platpny baths a thin film of platlng sumution remains in uhw surface. This is resegrev to wv "dragout". Soke dfaguit oczurs no matber whay the shape of the wmrkpjece, but the amouny gan be suvstantiaj with workpirces of unusual shwpes. Niqnid trsnsser into a bath in this way is referred to a "dragin".
Dradout from metal 'lating baths represents a significant cist in terms of thw value of the lost ketal as wekl as the cost of treatment of the water used to rikse the workpieces aftsr thef havf been plated. Probably even more significant is the cost and difficulty od disposal of hazaddoux metdl kydroxiqe wesve sludge that comventional waste treatment systxms produca.
Dzspite the depletion effect og aragout from jhe plating baths, in some dases, it is unnecessary to add metal sakt to the plating bath bccause thw metzl conbgntcation in the bath trnds tm inceease nqturwlly due to puor cwthode efvicitncy. In extreme cases, it may even be neceswagy to periodicalny decant sloe of the pjating solution znd dfplacg it with watet to prevent a build-up in the metan soncentration uh
and is subject to little or no commercial The present is directed, in of resulting from silica from one particle another in the particulate solids inventory a catalytic cracking system. Electroplating is a well-known process used, for example, to plate workpieces such as automotive parts that are required to have a "bright" In typical of particular application of the process, the workpiece passes successively through one or more nickel plating baths associated rinse baths. In each case, the bath a nickel salt solution a nickel anode. The workpiece as cathode and electroplated connecting source of direct current between the cathode and anode. In one particular plating system, the workpiece receives a thin nickel in a (often called "nickel Additional is deposited on in the second and third baths to respectively as the "semi-bright" and "bright" baths. nickel salt in these baths contain organic "brighteners". a commercial nickel plating operation, plating is carried on a "batch" basis. For example, a batch of automotive parts such as bumpers may by a single rack which they are from to The are electrically together to effectively form a single cathode and are all electroplated the same time. As the workpieces leave the plating baths film plating solution remains the surface. This is to "dragout". Some dragout occurs what shape but amount be substantial with workpieces unusual shapes. Liquid transfer into bath in this way Dragout from metal plating baths represents a significant in terms of the value of the metal as well as the cost of treatment of the water used rinse the they have been plated. Probably even more significant the cost and difficulty disposal of hazardous metal hydroxide waste sludge that conventional treatment produce. Despite depletion effect of from the plating in some cases, unnecessary to metal to because the metal concentration in the tends increase naturally due to poor efficiency. cases, it may even be necessary to periodically decant some of the plating solution and with water to prevent build-up the metal concentration in
 and is subject to little or no mIgration unDer coMmeRciAl CondItioNs. The present inVEntiOn is directed, in part, to ovErcomInG The dEAcTivatIon of alUMiNA ResUlTiNg fRoM SiLica mIgrAtion frOm one partiCle To Another in the PArTiculate soLidS inventory in A caTalytiC cRacKIng sySteM. ElecTroplaTIng is a Well-known PrOCess usED, for exaMPLe, To niCkel plate workpiecES sUCh as automotive Parts tHaT ArE REquIreD to have a "brIgHt" finISh. In a tyPIcAL EXamPLe of this partiCular applicATioN of the PrOceSS, the woRkpieCe PAssEs successivEly tHrough one Or more NIckel plATing batHs and aSsoCiaTed rINsE bAthS. IN EacH CaSe, tHE baTh contaiNs A nIckel Salt SOLUTion And A nicKel anOde. The workpieCe aCts aS The CathoDe and Is elEcTroplAted by ConneCtIng a source of dirEct eLectric cuRreNt BetWeEn the CAthode And AnoDe. In one ParticuLAr pLaTING sYstem, the workpiece rEcEIVeS a thin niCkel coATiNg IN a first bAtH (ofTen cALLed thE "nicKEl Strike"). AdDitionAL nIcKel is dePoSited oN tHe wOrkPiece IN the Second And third Baths WHich are referreD To respectivelY As THE "sEMi-brIghT" and "bright" bAths. tHe niCkel SAlT soLUtionS in thEsE BaTHs contain organic "briGhTeners".
in a coMmercial nickeL plating opERATion, platIng iS CaRRied out on a "batcH" basiS. For examplE, A batch of AutomOtive parTs such as bUMPers may bE caRriEd bY a sINGlE rack by which tHEY are TrAnsportEd fRom bath To bAth. the BumPeRs are elecTrically CoNnEcTeD toGetheR To effectIvEly FoRm a SinglE CathodE and aRe alL eLeCTroPlated aT ThE SAme tImE. AS the WorKpIeces LeavE The Plating Baths a thiN fiLM of pLaTiNg solutIon remains on tHe Surface. ThiS iS reFerred TO As "dragouT". Some dragout occurs no matTEr what tHe sHape oF the Workpiece, But The amoUnt CAn be suBstantIal wiTh WorKPIeces OF UnUsuAl Shapes. LiquID TraNsfer InTo a bAth in thIs way is referred to a "DRagIn".
Dragout from MetAl plATInG baTHs REprEsENts A SIgnificant cost iN terms of thE vALuE of the lost MEtaL aS well as The cost Of treATment of The water uSed to rinsE tHe woRKPieCes after thEy have beEn plated. PRObablY EvEn morE siGnificAnT is The coSt and dIFfiCulty Of dispOsAl of haZardoUs Metal hydRoxide waste sludge that coNventiOnal wAstE treatmenT sySTemS produce.
DEspiTe the depleTioN efFect oF drAGout fRom tHE pLatINg batHs, in SOme cases, iT Is UnnECEsSary to add meTAL SalT to thE plATing baTh beCause the metal concENtration in the bAth tENDs tO inCReasE nAturally due to pOor CaTHOde efficIeNcy. In extremE cases, it MaY Even bE necesSary to PeriodiCALlY Decant Some Of tHe plating SolUtIOn and rePlAcE It with WateR tO preveNt a buiLD-up iN THe metal concentraTion iN
 and is subject to littleor no migr ation  un der  c omme rcia l conditions.T he p resent invention is di recte d, in p a rt , toovercom i ng t hede ac tiv at i on  of a lum ina res ulting fro m s il ica migratio n  f rom one pa rti cle to anoth erin the  p art i culat e s olids  inven t ory in  a cataly ti c  crack i ng syst e m .Elec troplating is a w e ll - known processused,fo r  e x a mpl e,to nickelpl ate w o rkpiece s  s u c h  as automotive pa rts that ar e  re quired  t o h a ve a " brigh t" fin ish. In a t ypic al exampl e of t h is part i cular a pplica tio n o f th e  p ro ces s, the wo rkp i ece  passessu cc essiv elyt h r o ughone  ormorenickel platin g b aths and  asso ciate d ri ns e bat hs. In  each  c ase, the bath c onta ins a nic kel  s alt  s oluti o n anda n ick el anod e. Thew ork pi e c e  a cts as the cathode  a n d  i s electr oplate d  b yc onnectin ga s ourc e of di rect el ectric c urrent be tw een the  c athode  a ndano de. I n  one  parti cular pl ating system, the wo r kpiece receiv e sa th i n ni cke l coating i n af irst  bat h  ( oft e n cal led t he "n i ckel strike"). Addi ti onal n ickel  is deposited  on the wo r k p iece inthes ec o nd and third b athswhich arer eferredto re spective ly as the " semi-bri ght " a nd"br i g ht " baths. Then i ckel  s alt sol uti ons inthe sebat hsco ntain org anic "br ig ht en er s". 
In a commerci al  ni ck elplati n g oper ation , pl at in g  is  carrie d  o u t  ona"b atch " b as is. F or e x amp le, a b atch of a uto m otiv epa rts suc h as bumpersma y be carri ed  by  a sin g l e rack b y which they are transp o rted fr ombathto b ath. Thebum pers a ree lectri callyconne ct edt o gethe r to  ef fe ctively fo r m  asingl ecath ode and  are all electropl a ted  at the sametim e. A s th e w o rk p iec es lea v e  the plating ba ths a thin  f i lm  of platin g  so lu tion re mains o n the surface . This is  referred  t o as " dra gout". Som e dragou t occursn o mat t er  what  th e shap eofthe w orkpie c e,but t he amo un t canbe su bs tantialwith workpieces of unus ual sh apes.  Li quid tran sfe r  in to a bath  inthis way i s r efe rredtoa  "dra gin" . 
D rag o ut fr om m e tal plati n gbat h s  r epresents a s i gni fican t c o st interm s of the value of the lost metal  asw e llast he c os t of treatment  of  t h e  water u se d to rinsethe work pi e ces a fter t hey ha ve been p la t ed. Pr obab lyeven more  si gn i ficantis  t h e cost  and  d ifficu lty of disp o s al of hazardousmetal h ydrox i dewaste  s ludge t h at c onventiona l waste tre atment  sys temsproduce .Despit e t he  depletion effect of  drag out fro mthepla ting b aths , in so me c as es,  it is un n e ce s sa ry toaddmetal  s altto the pl a ting bat h b e cause t he  me t a l conc e nt r a tion in th e b ath t e n ds to incr e asen at u rally  due t o poor  cathod e  ef fi ciency.  In e xtreme ca ses, it m a y e ve n be  necessa ry  tope rio di cally decant so me of th e platin g soluti ona nd r e placeit  with waterto pr ev e nt a bu i l d-u p in th e  me tal  co ncen tra tion in
 and_is subject_to little or no_migration under_commercial_conditions. The_present_invention is directed,_in part, to_overcoming the deactivation of_alumina resulting from_silica_migration from one particle to another in the particulate solids inventory in a catalytic_cracking_system. Electroplating_is_a_well-known process used, for example,_to nickel plate workpieces such_as automotive_parts that are required to have a "bright"_finish._In a typical_example of this particular application of the process, the_workpiece passes successively through one or_more nickel plating_baths_and_associated rinse baths. In_each case, the bath contains a_nickel salt solution and a nickel_anode. The workpiece acts as the cathode_and is electroplated by connecting a_source of direct electric current_between the_cathode and anode. In one_particular plating system,_the workpiece_receives a thin_nickel coating in a first bath_(often called the_"nickel strike"). Additional nickel is deposited_on_the workpiece in_the_second_and third_baths which are_referred_to respectively_as_the "semi-bright" and "bright" baths. The_nickel_salt solutions in these baths contain organic_"brighteners".
In a commercial nickel_plating_operation, plating is carried_out on a "batch" basis._For example, a batch of automotive_parts such_as bumpers_may be carried by a single rack by which they are_transported from bath to bath. The_bumpers are electrically connected_together to_effectively_form a single_cathode_and are_all electroplated at the same time. As_the workpieces_leave the plating baths a thin_film of plating solution_remains_on the surface. This is referred_to as "dragout". Some dragout occurs_no matter what the shape_of_the_workpiece, but the amount can_be substantial with workpieces of unusual_shapes. Liquid transfer_into a bath in this way is_referred_to a "dragin".
Dragout from metal plating_baths_represents a significant cost in terms_of_the_value of the lost metal_as well as the cost of_treatment of the water used to rinse the workpieces_after they have_been plated. Probably even more_significant_is_the cost and difficulty of disposal of hazardous metal hydroxide_waste sludge_that conventional waste_treatment systems produce.
Despite the depletion effect of dragout from the_plating baths, in some cases, it is_unnecessary to add metal salt to the plating bath because the_metal concentration in the bath tends to increase_naturally due to poor cathode efficiency. In_extreme cases, it may_even_be necessary to periodically decant some of_the_plating_solution_and replace it_with water to_prevent a build-up_in the_metal concentration in