'913.] IN ORES OF COLORADO AND UTAH. 205 



to 15° C. Hydrous aluminum chloride is precipitated together with 

 lead chloride, while iron, uranium, vanadium, etc., remain in solu- 

 tion. Prepare an equal volume of hydrochloric acid and ether satu- 

 rated as described above at 15° C. to wash the precipitate of alumi- 

 num chloride. 



Filter on a Gooch crucible, allowing the solution to run into a 

 beaker in a bell-jar and wash with the prepared solution. Heat 

 the filtrate and washings carefully, evaporate to syrupy consistency 

 and make an ether separation in the usual way. The ethereal solu- 

 tion contains the ferric chloride and any molybdenum that may be 

 in the ore, while the acid solution contains the uranium, vanadium, 

 lime, etc. Evaporate the solution nearly to dryness, replace the 

 hydrochloric acid by nitric acid, and evaporate to dryness at water 

 bath temperature. This oxidizes the vanadium and uranium to the 

 vanadic and uranic conditions. Add a few drops of nitric acid 

 and dilute the solution, add ammonia until a permanent precipitate 

 forms, then excess of ammonium carbonate to dissolve the uranium 

 and vanadium, and filter to get rid of any small amounts of alumina, 

 and oxide of iron that may not have been removed by the operations 

 described above. Determine the uranium as described in the first 

 method as uranyl vanadate. 



Determination of Vanadium. 



Boil 2 grammes of the finely ground ore with 10 c.c. of nitric 

 acid and 10 c.c. of water, add hydrochloric acid in excess, evaporate 

 to dryness, redissolve in hydrochloric acid, dilute and filter. Reject 

 the insoluble matter. Evaporate the filtrate to syrupy consistency 

 and make an ether separation to get rid of the iron. Evaporate 

 the hydrochloric acid solution very low, add 25 c.c. or 30 c.c. hydro- 

 chloric acid and repeat the evaporation several times to insure the 

 reduction of the vanadium to vanadyl chloride. Add 5 c.c. strong 

 sulphuric acid and evaporate until fumes of sulphuric acid are given 

 ofif. Cool, dissolve in water, and titrate at a temperature of about 

 6o°-yo° C. with permanganate solution in a volume of about 100 

 c.c. The iron factor of the permanganate multiplied by 1.6342 

 gives the V0O5, taking vanadium as 51.0. 



Philadelphia, April, 1913. 



