Uranium

• 역청우라늄석

• UO₂

Oxidation Uranium dioxide is extracted from powder form by oxidizing it into uranyl ion: \[ \schemestart \chemfig{UO_{2}} + 2\chemfig{Fe^{3+}} \arrow \chemfig{UO_{2}^{2+}} + 2\chemfig{Fe^{2+}}. \schemestop \] The metal ion can be provided with iron trichloride, \( \chemfig{Fe_2 {(SO_4)_3}} \), manganese dioxide, or sodium chlorate.

Alkaline Leaching First oxidize uranium with oxygen: \[ \schemestart 2\chemfig{UO_{2}} + \chemfig{O_2} \arrow 2\chemfig{UO_3}, \schemestop \] and dissolve it using sodium carbonate or sodium bicarbonate. Hydrogen peroxide (exists in sodium percarbonate) further oxidize uranium trioxide into soluble sodium uranyl carbonate \( \chemfig{Na_4UO_2{(CO_{3})_3}} \).

Ion exchange resin Get uranium anion to be adsorbed selectively onto resin

Organic Compound Use uranium-adsorbative organic compound such as tributyl phosphate or Calix[6]arene (C6) to transfer uranium ion into organic layer.

CNT can be used as the backbone for the TBP.

Uranyl ion is precipitated under basic condition created by ammonium hydroxide or sodium hydroxide.

It becomes ammonium diuranate \( \chemfig{{(NH_4)_2}U_2O_7}} \). Sodium hydroxide is not recommended as it uranium is contaminated with sodium.

After dehydration and baking, ammonium diuranate becomes \( \chemfig{U_3O_8} \) solid known as the yellow cake.

The yellow cake is dissolved with nitric acid into uranyl nitrate \( \chemfig{UO_2 {(NO_3)_2}} \), and condensed into uranium dioxide again.

Hydrogen fluoride is added to uranium dioxide to form stable solid uranium tetrafluoride known as green salt.

Ames Process Mix with magnesium or calcium metal and apply heat to about 1773 K in a sealed chamber. The flourine transfer to magnesium.

Uranium with trace molybdenum or titanium.