64 JOURNAL OF THK 



///. By Sulphur Dioxide, 



Sulphurous acid ma}^ be used for the separation of 

 zirconium and aluminium as well. The process is es- 

 sentially the same as for the separation of iron and zir- 

 conium (see above). 



The analyses proving- this are aL:,o g-iven. 



Xuviber. Found. Used. 



^... \ ZrO. 0.1042 0.1043 



--^^ ) A1.6 0.0608 0.0610 



r,r.^ \ Zrb 0.1070 0.1070 



^^' \ AI2O 0.0316 0.0305 



SEPARATION OF ZIRCONIUM AND TITANIUM. 



As is well known, titanium and zirconium are metals 

 possessing- many properties in common. Their deport- 

 ment with reag^ents is very similar, varying only in de- 

 gree, as a rule. This fact, and that of the properties 

 of each being- further altered by the presence of the 

 other in the same solution, "^'^ renders their separation 

 extremely difficult. An example of this alteration of 

 properties was noted on boiling a solution of sulphates 

 of these metals. On long- continued boiling- titanium 

 sulphate, when in solution alone, is completely precipi- 

 tated. Zirconium sulphate, under the same conditions, 

 produces no precipitate, whereas a mixture of these 

 permits of only a partial precipitation of the titanium, 

 the larger portion remaining- undissolved (Berzelius'O- 



/. By Potassiu))i Sulphate. 

 It was not found possible to use the precipitation of 



23 Rose Analyt. Chein, p. 172. 

 24. Pogg-. Ann. VI., 232. 



