| 摘要 |
<p>PURPOSE:To smoothly perform operations for separation and recovery of molybdenum by using a specific phosphinic acid compound as the extractant. CONSTITUTION:A solvent obtained by diluting 'Cyanex(R)' 272 which consists essentially of di-(2,4,4-trimethylpentyl)-phosphinic acid, with 'EXXSOL(R)' D80, an industrial diluent, to 20vol.% is used as the extractant. An aqueous solution is prepared by adding an adequate amount of sulfuric acid to another aqueous solution contg. 50 mM sodium sulfate as the impurity and 0.3g/l of any one metal ion selected from molybdenum (VI), vanadium (IV), iron (III), aluminum, nickel and cobalt ions and by adjusting the pH. Then the aqueous solution and the above solvent are mixed and shaken together in 1:1 volume ratio, at 40 deg.C for 117 hours. From the results obtained it is understood that 95% of molybdenum can be extracted while the other metals are scarcely extracted at about pH 0.</p> |
