Let me resume Portugal uranium affair ...from 1955, to 1987, glass industry in Portugal used trioxide uranium, by a chemical method ( 1. dissolution of uranium in nitric acid, 2. purification with phospate 3. precipitation in ammonia 4. calcination at 350.º 5. and the metal, trioxide of uranium) this was, low enriched uranium. This uranium also uranium oxide was the "depleted"uranium sold to Saddam Hussein. Today's nuclear reactor at Loures IST university, is producing "irradiate" nuclear fuel, by the method of PWR (pressurized water reactor) the only uranium extracted is low enriched.

Ok, on the last picture they show top left the graphite that goes inside the furnace...the graphite nuclear reactor is this one ((this enrichment process is the simple you can get, gas diffusion separation method)

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So, we usually think that producing yellow cake, is as difficult as, building a nuclear reactor, as Iran objectiv. Well Saddam Hussein was smarter "During the 1970s and early 1980s, Iraq bought uranium in various forms from the international market. These materials included about 486 tons of yellowcake, 33,470 kg of “natural” uranium dioxide, 1,767 kg of “low-enriched” uranium dioxide (2.6 percent 235U), and 6,005 kg of “depleted” uranium dioxide from Portugal, Italy, Niger, and Brazil. "

picture : cortesy of the CIA