REMOVING AND RECOVERING METHOD FOR URANIUM AND*OR THORIUM FROM LIQUOR CONTAINING URANIUM AND*OR THORIUM

摘要

PURPOSE:To recover the titled U or Th of high purity in a high yield by acid treating a precipitate with U or Th captured and adding NH3 to form a precipitate of NH4 salt of U or Th. CONSTITUTION:Sodium silicate is added to liquor contg. U or Th to allow an amorphous silica-base precipitate to capture the U or Th. This precipitate is treated with acid of suitable pH to elute the captured U or Th while inhibiting the elution of Si. NH3 is then added to an acidic soln. contg. the eluted U or Th and precipitate is obtd. by filtration, and the resulting precipitate of NH4 salt of U or Th is filtered out. By this method U or Th of high purity reusable in the manufacture of nuclear fuel can be removed and recovered in a high yield.