Show RECOVERY OF RADIUM FROM I 1 tests to determine the effect of variations of time temperature pera ture and concentration of reagents on the carbonation ion conversion version of carbonates of different types of ore were recently undertaken by the department of the interior at the rare and precious metals experiment station of the bureau of mines reno nevada such data are now available and should leadmo lead to improvements in general practice only one series of tests was completed these results gave a curve showing that the per cent conversion rises very rapidly to 92 as the amount of soda used approached grams per kilo of ore it then breaks and gradually reaches a maximum of 95 for grams of soda such a curve would be valuable in deciding the most economical limit of soda consumption the abandonment aban doment of radium production in this country caused the work to be postponed A study was begun by the bureau of mines to determine the fundamental nature of of radium and barium the fact that radium is precipitated from solutions I 1 of radium barium salts much more completely than would be expected from the known solubility of the radium salt precipitated may be explained either as inclusion mass action or absorption data hitherto published deduce that absorption is the he cause but certain details were absent from this data which might reverse the conclusion it has also been generally accepted i i that when radium barium sulphate is precipitated the radium barium ratio does not change A series of partial half tp portion precipitations made in the manner of a fractional t crystallization series gave a tenfold ratio between radium concentrations cent rations of the 3 and 3 products the precipitates having higher concentrations of radium than the filtrate in every instance extension of experiments made by F E E gorman german on absorption of radium barium chloride by barium sulphate is contemplated by the bureau of mines also a method proposed by prof victor lehner for separating radium barium sulphates by means of selenium chloride will be given attention |