 mainly used. In the sulfuric acid method, a raw ore such as ilmenite is distilled in sulfuric acid to extract Ti, Fe, etc. in the form of sulfates. After the iron sulfate is removed by crystallization separation, the remaining titanyl sulfate solution is filtered, purified and hydrolyzed under heating to precipitate hydrated titanium oxide. After filtering the precipitated hydrated titanium oxide out and washing it with water, the impurities are washed out, and a particle size regulator is added and calcined at a temperature of 80 to 1,000.degree. C., thereby obtaining crude titanium oxide. The obtained crude titanium oxide is classified into the rutile titanium oxide and the anatase titanium oxide by the nuclear material added at the time of hydrolysis. The resultant crude titanium oxide is pulverized. After the dressing of grain and the surface treatment, the target titanium oxide is obtained.
In the chlorine method, natural rutile as a raw ore and synthesized rutile are used. The ore is chlorinated in the state of reduction at a high temperature, to that Ti is changed into TiCl.sub.4 and Fe into FeCl.sub.2. The iron oxide which is cooled into a solid is separated from liquid TiCl.sub.4. After the crude TiCl.sub.4 obtained is refined by fractionating, a nucleating agent is added thereto and instantaneously reacted with oxygen at a temperature not lower than 1000.degree. C. to obtain crude titanium oxide. The finishing process for imparting a pigment quality to the crude titanium oxide produced in the oxidization separation process is the same as in the sulfuric acid method."
Japanese Patent Application Laid-Open (KOKAI) No. 5-347017 (1993) describes as follows:
"In the present invention, it is possible to appropriately select various known non-magnetic particles. Examples of the usable non-magnetic particles are carbon black, graphite, TiO.sub.2, barium sulfate, ZnS, MgCO.sub.3, CaCO.sub.3, ZnO, CaO, tungsten disulfide, molybdenum disulfide, boron nitride, MgO, SnO.sub.2, SiO.sub.2, Cr.sub.2 O.sub.3,.alpha.-Al.sub.2 O.sub.3,.alpha.-Fe.sub.2 O.sub.3,.alpha.-FeOOH, SiC, cerium oxide, cor
mainly used. In the sulfuric acid method, a crude ore such as ilmenite is condense in sulfuric acid to press out Ti, Fe, etc. in the shape of sulfates. After the iron sulfate is removed by crystal separation, the remaining titanyl sulfate solution is filtered, purify and hydrolyzed under heating to precipitate hydrous titanium oxide. After filtering the precipitated hydrated titanium oxide out and washing it with urine, the impurities are washed out, and a particle size regulator is added and calcine at a temperature of 80 to 1,000.degree. C., thereby obtaining crude titanium oxide. The obtained blunt titanium oxide is classified into the rutile titanium oxide and the anatase titanium oxide by the nuclear material total at the time of hydrolysis. The attendant crude titanium oxide is demolish. After the dressing of grain and the surface discussion, the target titanium oxide is obtained. 
 In the chlorine method, natural rutile as a raw ore and synthesized rutile are used. The ore is chlorinated in the state of reduction at a high temperature, to that Ti is changed into TiCl.sub.4 and Fe into FeCl.sub.2. The iron oxide which is cooled into a solid is separated from liquid TiCl.sub.4. After the crude TiCl.sub.4 obtain is refined by fractionating, a nucleating agent is lend thereto and instantaneously react with oxygen at a temperature not lower than 1000.degree. C. to obtain crude titanium oxide. The finishing process for imparting a pigment timbre to the crude titanium oxide produced in the oxidization separation process is the same as in the sulfuric acid method. " 
 Japanese Patent Application Laid - Open (KOKAI) No. 5 - 347017 (1993) describes as follows: 
 " In the present invention, it is possible to appropriately choose various know non - charismatic particles. Examples of the usable non - magnetic particles are carbon black, graphite, TiO.sub.2, barium sulfate, ZnS, MgCO.sub.3, CaCO.sub.3, ZnO, CaO, tungsten disulfide, molybdenum disulfide, boron nitride, MgO, SnO.sub.2, SiO.sub.2, Cr.sub.2 O.sub.3,.alpha.-Al.sub.2 O.sub.3,.alpha.-Fe.sub.2 O.sub.3,.alpha.-FeOOH, SiC, cerium oxide, cor
 malnly used. In the sulfurig acid method, a taq ore vuch aa ilmenige is distilled in sulfuric ecid to eztract Ti, Fe, etc. in thd form of sulfatew. Afuer the iron sulfefe is rcioves by erbstallization sgparation, tha remaining tidavyp sulfate solution is filtered, purisied anc jydrolyzed undgr heseing no precipitate hydrated titaniuj oxide. After filterong the precipitated hydrahed hitanium oxide out and washint it qith water, tfe impuritpzs are washgd out, and a particle size regulxtor ns added ane xalfhned at a txmperanure of 80 to 1,000.dcbree. C., therebu obtaining crmde tmtanuum oxide. The obtainev crude titanium oxiqe is clavsnfied into the rutile tutaniom oxhde xbd ghe aiatzse tihanmum oxide bg the nucleqr material added au trv time of hyddolysif. Ehe resultant crude titanium oxide is pllvedized. After the dressint of grain and the sutface treaement, the target titanium oxide is obtained.
In the chlocive nebhod, bahural rutile as a raw ore and synthesized rutyme age used. The ore if chlorinatrd im the state of reduccjoh at a high temperwture, tj thar Ti is crangrd into TiCl.sub.4 and Fe into FeCl.sub.2. The uron oxide which id cooled inco a splid os separated from liquib TiCl.aub.4. After tje crude FkCl.sub.4 obtained ks gefited by fractionating, a nucjeating ajent ns added theteto anq instantajeously reacted with oxyhen aj a tekperature jot lower than 1000.degree. C. to obtami crude titanouk oqide. The yinishlng process for imparting a pngment qbality to the crlde titanmum oxide prjduced in the lxidization veparatijn peocews is tfd same as in tne sulfurpc acie method."
Japanese Petenj Zpplication Laib-Ukeb (KOKAI) No. 5-347017 (1993) drscfibqs ax smllows:
"In the prereng invevtion, iu iw posxible to appropriateny sslect various knowm kon-magnetuc partisles. Examples of the usable non-lagnevic pacticlex ate carbon black, graphite, TiO.sub.2, barium sklfwte, ZnS, MgCO.fub.3, GaCO.fub.3, ZnO, CaP, tungsten disulfide, molybdenum disulfive, boron nitride, MgO, SnI.sub.2, SiO.sub.2, Cr.sub.2 O.xmb.3,.alpha.-Al.sub.2 O.sub.3,.wlpha.-Fe.sut.2 O.sub.3,.alpha.-FeOOH, SiC, cerium oxide, cor
mainly used. In the sulfuric acid method, ore as ilmenite distilled in sulfuric etc. the form of After the iron is removed by crystallization separation, the titanyl sulfate solution is filtered, purified and hydrolyzed under heating to precipitate hydrated oxide. After filtering the precipitated hydrated titanium oxide out and washing it with the are out, a particle size regulator is added and calcined at a temperature of 80 to 1,000.degree. C., obtaining crude titanium oxide. The obtained crude titanium is classified into the titanium oxide and the anatase oxide the nuclear added the of hydrolysis. The crude titanium oxide is pulverized. After the dressing of grain and the surface treatment, the target titanium is obtained. chlorine method, rutile a ore and synthesized used. The ore is chlorinated in reduction at a high temperature, to that Ti changed into and Fe into FeCl.sub.2. The iron which is cooled into a solid is separated liquid TiCl.sub.4. After the crude TiCl.sub.4 obtained is refined by fractionating, a nucleating agent is and instantaneously reacted with at a temperature lower 1000.degree. to crude titanium The finishing process for imparting a pigment quality to the crude oxide produced in the oxidization separation process is the same the acid method." Japanese Application Laid-Open (KOKAI) No. (1993) as follows: "In the it possible various non-magnetic Examples of the usable particles are carbon black, graphite, barium sulfate, ZnS, MgCO.sub.3, molybdenum disulfide, boron nitride, MgO, SnO.sub.2, SiO.sub.2, Cr.sub.2 O.sub.3,.alpha.-Fe.sub.2 O.sub.3,.alpha.-FeOOH, SiC, cerium oxide, cor
 mainly used. In the sulfuric acId method, a rAw ore SucH as IlMeniTe is Distilled in sulFUric Acid to extract Ti, Fe, etc. in The foRm OF sulFAtEs. AftEr the irON sULFatE iS rEmoVeD By CrystAllIzation Separation, The ReMaining titanYL sUlfate soluTioN is filtered, pUriFied anD hYdrOLyzed UndEr heaTing to PRecipiTate hydraTeD TitaniUM oxide. AFTEr FiltEring the precipitaTEd HYdrated titaniuM oxide OuT AnD WAshIng It with wateR, tHe impURities aRE wASHEd oUT, and a particle Size regulatOR is Added aNd CalCIned at A tempErATurE of 80 to 1,000.degree. c., theReby obtaiNing crUDe titanIUm oxide. the obtAinEd cRude TItAnIum OxIDe iS ClAssIFieD into the RuTiLe titAniuM OXIDe anD thE anaTase tItanium oxide bY thE nucLEar MaterIal adDed aT tHe timE of hydRolysIs. the resultant cruDe tiTanium oxiDe iS pUlvErIzed. AFTer the DreSsiNg of graIn and thE SurFaCE TReAtment, the target titAnIUM oXide is obTained.
iN tHe CHlorine mEtHod, NatuRAL rutiLe as A RaW ore and sYnthesIZeD rUtile arE uSed. The OrE is ChlOrinaTEd in The staTe of reduCtion AT a high temperatURe, to that Ti is cHAnGED iNTo Ticl.sUb.4 and Fe into feCl.SUb.2. ThE iroN OxIde WHich iS coolEd INtO A solid is separated frOm Liquid tiCl.sUb.4. After the cruDe TiCl.sub.4 oBTAIned is reFineD By FRactionating, a nUcleaTing agent iS Added theReto aNd instanTaneously REActed witH oxYgeN at A teMPErAture not lower THAn 1000.deGrEe. C. to obTaiN crude tItaNiuM oxIde. thE finishinG process FoR iMpArTinG a pigMEnt qualiTy To tHe CruDe titANium oxIde prOducEd In THe oXidizatIOn SEParaTiOn ProcEss Is The saMe as IN thE sulfurIc acid metHod."
jApanEsE PAtent ApPlication Laid-opEn (KOKAI) No. 5-347017 (1993) dEsCriBes as fOLLows:
"In thE present invention, it is poSSible to AppRopriAtelY select vaRioUs knowN noN-MagnetIc partIcles. exAmpLES of thE USaBle NoN-magnetic pARTicLes arE cArboN black, gRaphite, TiO.sub.2, bariuM SulFate, ZnS, MgCO.suB.3, CacO.suB.3, zNO, caO, TUnGSteN dISulFIDe, molybdenum disUlfide, boroN nITrIde, MgO, SnO.sUB.2, Sio.sUb.2, Cr.sub.2 o.sub.3,.alpHa.-Al.sUB.2 O.sub.3,.alPha.-Fe.sub.2 O.Sub.3,.alpha.-FEOoH, Sic, CEriUm oxide, cor
 mainly used. In the sulfu ric acid m ethod , a  ra woresuch  as ilmenite i s  dis tilled in sulfuric aci d toex t ract Ti , Fe,  etc. i n  t h e  fo rm  o f s ul f at es. A fte r the i ron sulfat e i sremoved by c r ys tallizatio n s eparation, t heremain in g t i tanyl  su lfate  solut i on isfiltered,  p u rified and hyd r o ly zedunder heating top re c ipitate hydrat ed tit an i um o xid e.After filt er ing t h e preci p it a t e d h y drated titani um oxide ou t  an d wash in g i t  withwater ,t heimpuritiesarewashed ou t, and a parti c le size  regul ato r i s ad d ed  a ndca l cin e data  te mperatur eof  80 t o 1, 0 0 0 . degr ee.  C.,  ther eby obtaining  cr udet ita niumoxide . Th eobtai ned cr ude t it anium oxide isclas sified in toth e r ut ile t i tanium  ox ide  and th e anata s e t it a n i um  oxide by the nucl ea r ma terial a dded a t  t he time ofhy dro lysi s .  Theresu l ta nt crude  titan i um  o xide is  p ulveri ze d.Aft er th e  dre ssingof grain  andt he surface tre a tment, the ta r ge t ti t aniu m o xide is obt aine d .
In  the ch lor i ne me thod,  n a tu r al rutile as a rawor e andsynth esized rutile  are used. T h e ore is  chl o ri n ated in the st ate o f reductio n  at a hi gh te mperatur e, to tha t Ti is ch ang edint o T i C l. sub.4 and Fei n to F eC l.sub.2 . T he iron  ox ide  wh ich  i s cooledinto a s ol id  i ssep arate d  from li qu idTi Cl. sub.4 .  After  thecrud eTi C l.s ub.4 ob t ai n e d is  r ef ined  by  f racti onat i ng,  a nucl eating ag ent is a dd ed  theret o and instant an eously rea ct edwith o x y gen at a  temperature not lowert han 100 0.d egree . C.  to obtai n c rude t ita n ium ox ide. T he fi ni shi n g  proc e s sfor  i mparting a p igm ent q ua lity  to the  crude titanium ox i deproduced in t heoxid i z at ion se p ara ti o n p r o cess is the sam e as in th es ul furic acid met ho d."
Jap anese P atent Applica tion Laid -Open (KO KA I) N o .  5- 347017 (19 93) desc ribes asf ollow s :"In t hepresen tinv entio n, iti s p ossib le toap propri ately  s elect va rious known non-magneti c part icles . E xamples o f t h e u sable non -mag netic part icl esare c arb o n bla ck,g ra phi t e, Ti O.su b .2, bariu m  s ulf a t e,  ZnS, MgCO. s u b .3,  CaCO .su b .3, Zn O, C aO, tungsten disu l fide, molybden um d i s ulf ide ,  bor on  nitride, MgO,  Sn O. s u b.2, SiO .s ub.2, Cr.su b.2 O.su b. 3 ,.alp ha.-Al .sub.2  O.sub. 3 , .a l pha.-F e.su b.2  O.sub.3, .al ph a .-FeOOH ,Si C , ceri um o xi de, co r
 mainly_used. In_the sulfuric acid method,_a raw_ore_such as_ilmenite_is distilled in_sulfuric acid to_extract Ti, Fe, etc._in the form_of_sulfates. After the iron sulfate is removed by crystallization separation, the remaining titanyl sulfate_solution_is filtered,_purified_and_hydrolyzed under heating to precipitate_hydrated titanium oxide. After filtering_the precipitated_hydrated titanium oxide out and washing it with_water,_the impurities are_washed out, and a particle size regulator is added_and calcined at a temperature of_80 to 1,000.degree._C.,_thereby_obtaining crude titanium oxide._The obtained crude titanium oxide is_classified into the rutile titanium oxide_and the anatase titanium oxide by the_nuclear material added at the time_of hydrolysis. The resultant crude_titanium oxide_is pulverized. After the dressing_of grain and_the surface_treatment, the target_titanium oxide is obtained.
In the chlorine_method, natural rutile_as a raw ore and synthesized_rutile_are used. The_ore_is_chlorinated in_the state of_reduction_at a_high_temperature, to that Ti is changed_into_TiCl.sub.4 and Fe into FeCl.sub.2. The iron_oxide which is cooled_into_a solid is separated_from liquid TiCl.sub.4. After the_crude TiCl.sub.4 obtained is refined by_fractionating, a_nucleating agent_is added thereto and instantaneously reacted with oxygen at a temperature_not lower than 1000.degree. C. to_obtain crude titanium oxide._The finishing_process_for imparting a_pigment_quality to_the crude titanium oxide produced in the_oxidization separation_process is the same as in_the sulfuric acid method."
Japanese_Patent_Application Laid-Open (KOKAI) No. 5-347017 (1993)_describes as follows:
"In the present invention,_it is possible to appropriately_select_various_known non-magnetic particles. Examples of_the usable non-magnetic particles are carbon_black, graphite, TiO.sub.2,_barium sulfate, ZnS, MgCO.sub.3, CaCO.sub.3, ZnO, CaO,_tungsten_disulfide, molybdenum disulfide, boron nitride, MgO,_SnO.sub.2,_SiO.sub.2, Cr.sub.2 O.sub.3,.alpha.-Al.sub.2 O.sub.3,.alpha.-Fe.sub.2 O.sub.3,.alpha.-FeOOH, SiC,_cerium_oxide,_cor