Abstract: A gas mixer and distributor for a reactor has first and second inlet chambers with the second inlet chamber being interposed between the first inlet chamber and an entrance to a reaction chamber. Walls form tubular or slit-like passageways extending from the first chamber to the entrance of the reaction chamber through the second chamber. Upper portions of the passageways have uniform cross-sections selected to produce gas velocities above the flashback velocity, as well as producing turbulence to completely mix gas passing from the second chamber through orifices in the walls of the passageways. Lower sections of the passageways gradually increase in cross-section to reduce velocity and minimize vortexing and recirculation at the entrance to the reactor chamber.

Abstract: Uranium in wet-process phosphoric acid is extracted with an organic extractant. The pregnant extractant is then centrifuged to separate contaminants from the extractant. Secondary emulsions obtained by separating the contaminants following centrifugation are mixed with water or an acid leaching solution. After mixing, the mixture is centrifuged to separate and recover extractant which is recycled for stripping.

Abstract: Aqueous phosphoric acid, e.g., a slurry of the acid produced by the "wet" process, is contacted with steam under organic volatile-removing conditions to remove volatile organic material. A "wet process" aspect of the process involves contacting crude phosphoric acid produced by the wet process at a temperature, preferably not greater than 100.degree. C., while binding bindable solid impurities present and controlling the density of the acid to avoid deleterously affecting the processing character of the acid. In a first facet of this aspect, humic-extracting extractants are employed to remove humics, and in a second facet, heavy metal-extracting extractants are employed to recover heavy metals, from the acid.