F. S. Havens — Further Separations of Aluminum, etc. 45 



Akt. IV. — Further Separations of Aluminum by Hydro- 

 chloric Acid ; by Franke Stuart Havens. 



[Contributions from Kent Chemical Laboratory of Tale University — LXXL] 



In former papers* from this laboratory methods have been 

 described for the separation of aluminum from ferric iron, and 

 from beryllium, based on the insolubility of the hydrous 

 aluminum chloride in a mixture of equal parts of aqueous 

 hydrochloric acid and ether saturated with hydrochloric acid 

 gas, the ferric and beryllium chlorides being exceedingly 

 soluble in this mixture. 



It was the purpose of the investigations herein described to 

 discover how far this process could be extended, with certain 

 modifications, to cover the separation of aluminum from such 

 other metals as might occur with it, either in artificially pre- 

 pared alloys or in naturally-occurring compounds. 



The aluminum used in all the following experiments was in 

 the form of a solution of the chloride. This chloride was puri- 

 fied, as previously described,! from iron by precipitation with 

 hydrochloric acid, and from the alkalies by precipitation as the 

 hydroxide and continued washing with water until the washings 

 gave no test with silver nitrate. The hydroxide thus obtained 

 was dissolved in hot hydrochloric acid to get it into the form 

 of the chloride. The chloride solution was standardized by 

 precipitating weighed portions with ammonia and weighing as 

 the oxide. 



Separation of Aluminum from Zinc. 



A solution of pure zinc chloride made by dissolving metallic 

 zinc, free from impurities, in hydrochloric acid, is not pre- 

 cipitated when treated with an equal volume of ether and 

 saturated with hydrochloric acid gas. 



To prepare a definite zinc salt free from traces of the alkalies 

 which would be precipitated with the aluminum by strong 

 hydrochloric acid, pure metallic zinc was dissolved in hydro- 

 chloric acid, the dilute solution precipitated with ammonium 

 carbonate, and the resulting carbonate ignited to a constant 

 weight as zinc oxide. This oxide dissolved in hydrochloric 

 acid gave a pure chloride. 



The aluminum in all these experiments was determined in 

 the following manner: — Portions of the prepared solution of 

 aluminum chloride were weighed in a small beaker, weighed 

 portions of zinc oxide added and sufficient aqueous hydrochloric 



* Gooch and Havens: this Journal, vol. ii, p. 416. 

 Havens: this Journal, vol. iv, p. 111. 

 f Loc. cit. 



