Ammonium Uranyl Carbonate SDS

Revision Date: 01/24/2023


Name: Ammonium Uranyl Carbonate

Synonyms: Tetraammonium uranyl tricarbonate, of uranium depleted in uranium 235, Uranate(4-), tris[carbonato(2-)-O,O’]dioxo-, tetraammonium, (HB-8-22-111’1’1”1”), Azanium uranium carbonate

Formula: (NH4)4(UO2)(CO3)3


Uses: Substance is used in uranium yellow glazes.


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CAS RN: [18077-77-5]

NIH PubChem CID: 3015006

EC (EINECS/ELINCS): 241-988-5

UN (DOT): 2909

Merck: 12,602

Beilstein/Gmelin: N/A


  • Formula Mass: 522.21
  • Molar Mass: 522.199 g/mol
  • Melting Point: Decomposes between 165°C and 185°C
  • Solubility: Insoluble in water

Ammonium uranyl carbonate (UO2CO3·2(NH4)2CO3) is known in the uranium processing industry as AUC and is also called uranyl ammonium carbonate. This compound is important as a component in the conversion process of uranium hexafluoride (UF6) to uranium dioxide (UO2). The ammonium uranyl carbonate is combined with steam and hydrogen at 500-600°C to yield UO2.

In another process aqueous uranyl nitrate, known as uranyl nitrate liquor (UNL) is treated with ammonium bicarbonate to form ammonium uranyl carbonate as a solid precipitate. This is separated from the solution, dried with methanol and then calcinated with hydrogen directly to UO2 to obtain a sinterable grade powder. The ex-AUC uranium dioxide powder is free flowing, relatively coarse (10 µ) and porous with specific surface area in the range of 5m2/g, and suitable for direct palletization, avoiding the granulation step. Conversion to UO2 is often performed as the first stage of nuclear fuel fabrication.

The AUC process is followed in South Korea and Argentina. In the AUC route, calcination, reduction, and stabilization are simultaneously carried out in a vertical fluidized bed reactor. In most countries, sinterable grade UO2 powder for nuclear fuel is obtained by the ammonium diuranate (ADU) process, which requires several more steps.

Ammonium uranyl carbonate is also one of the many forms called yellowcake in this case it is the product obtained by the heap leach process.



  • Keep in a cool, dry, dark location in a tightly sealed container or cylinder.
  • Keep away from incompatible materials, ignition sources, and untrained individuals.
  • Secure and label area.
  • Protect containers and cylinders from physical damage.


  • All chemicals should be considered hazardous.
  • Avoid direct physical contact.
  • Use appropriate, approved safety equipment.
  • Untrained individuals should not handle this chemical or its container.
  • Handling should occur in a chemical fume hood.

Protection: Wear appropriate protective gloves, clothing, and goggles.

Respirators: Wear positive pressure self-contained breathing apparatus (SCBA).

Small spills and leaks:

  • Do not touch damaged packages or spilled material.
  • Cover liquid spill with sand, earth, or other noncombustible absorbent material.
  • Cover powder spill with plastic sheet or tarp to minimize spreading.
  • Contact radiation safety officer.


Presence of radioactive material will not influence the fire control processes and should not influence selection of techniques.

Small fires: Dry chemical, carbon dioxide, water spray or regular foam.
Large fires: Water spray, fog (flooding amounts).


Exposure Effects

Ingestion, skin, and eyes: See inhalation.


  • Minimal risk if packaging remains intact.
  • Package damage can result in a measurable release of radiation, but the risk is still low.

First Aid

Skin and eyes: 

  • Immediately flush with running water for at least 20 minutes.
  • See ingestion.


  • Apply artificial respiration if  is not breathing.
  • Administer oxygen if breathing is difficult.
  • See Ingestion.


  • Medical problems take priority over radiological concerns.
  • Use first aid treatment according to the nature of the injury.
  • Do not delay care and transport of a seriously injured person.


UN Number: 2909

Response Guide: 161

Hazard Class: 7


Ammonium Uranyl Carbonate

IUPAC Name: uranium(VI)dioxide di-ammonium carbonate.

Other Names: uranyl ammonium carbonate.

Molar Mass: 522.199 g/mol

Melting Point: Decomposes between 165°C and 185°C

Solubility in water: Insoluble.

Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references.


Copyright 2014 IBI Labs. License granted to make unlimited paper copies for internal use only.

IBI Labs expects that recipients of their material are in compliance with 29 CFR 1910.1200(h) which requires employers to provide employees with effective information and training on hazardous chemicals in their work area.

The information and recommendations set forth herein are presented in good faith and believed to be correct as of the revision date. However, recipients of this material should use this information only as a supplement to other information gathered by them and should make independent judgement of the suitability and accuracy of this information. IBI Labs will not be liable for any special, indirect, incidental, or consequential damages, including but not limited to, loss of any kind whatsoever resulting from the use of the information provided in this Safety Data Sheet. IBI Labs expressly includes all warranties, expressed or implied, including warranties of merchantability and fitness for a particular purpose.

This information is furnished without warranty, and any use of the product not in conformance with this Safety Data Sheet, or in combination with any other product or process, is the responsibility of the user.


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