Editing Nuclear fuel cycle (section)

===Milling===
When Uranium is mined out of the ground it does not contain enough pure uranium per pound to be used. The process of milling is how the cycle extracts the usable uranium from the rest of the materials, also known as tailings. To begin the milling process the ore is either ground into fine dust with water or crushed into dust without water.<ref name=":0">{{Cite book |last=Hore-Lacy |first=Ian |title=Uranium for nuclear power: resources, mining and transformation to fuel |date=2016 |publisher=Woodhead Publishing is an imprint of Elsevier |isbn=978-0-08-100307-7 |series=Woodhead Publishing series in energy |location=Duxford, UK}}</ref> Once the Materials have been physically treated, they then begin the process of being chemically treated by being doused in acids. Acids used include hydrochloric and nitrous acids but the most common acids are sulfuric acids. Alternatively if the material that the ore is made of is particularly resistant to acids then an alkali is used instead.<ref>{{Cite journal |last1=Edwards |first1=C. R. |last2=Oliver |first2=A. J. |date=September 2000 |title=Uranium processing: A review of current methods and technology |url=https://link.springer.com/10.1007/s11837-000-0181-2 |journal=JOM |language=en |volume=52 |issue=9 |pages=12–20 |doi=10.1007/s11837-000-0181-2 |bibcode=2000JOM....52i..12E |issn=1047-4838|url-access=subscription }}</ref> After being treated chemically the uranium particles are dissolved into the solution used to treat them. This solution is then filtered until what solids remain are separated from the liquids that contain the uranium. The undesirable solids are disposed of as [[tailings]].<ref>{{Cite report |url=http://dx.doi.org/10.2172/1342847 |title=Uranium Mining and Milling |last=Karpius |first=Peter |date=2017-02-02 |publisher=Office of Scientific and Technical Information (OSTI)|doi=10.2172/1342847 }}</ref> Once the solution has had the tailings removed the uranium is extracted from the rest of the liquid solution,  in one of two ways, solvent exchange or [[ion exchange]]. In the first of these a solvent is mixed into the solution. The dissolved uranium binds to the solvent and floats to the top while the other dissolved materials remain in the mixture. During ion exchange a different material is mixed into the solution and the uranium binds to it. Once filtered the material is panned out and washed off.<ref name=":0" /> The solution will repeat this process of filtration to pull as much usable uranium out as possible. The filtered uranium is then dried out into U<sub>3</sub>O<sub>8</sub> uranium. The milling process commonly yields dry powder-form material consisting of natural uranium, "[[yellowcake]]", which is sold on the uranium market as U<sub>3</sub>O<sub>8</sub>. Note that the material is not always yellow.