Abstract: A method of rejecting insoluble impurities during the production of sodium carbonate from trona ore comprising removal of minus 10 micrometer insoluble impurities from a calcined, crushed trona feed stream, slurried feed stream, and/or recrystallized slurried feed stream with the resulting sodium carbonate product containing less than about 0.2% insoluble impurities.

Abstract: Methods and apparatuses are provided for the removal and destruction of ammonia from an aqueous medium. The methods and apparatuses include the removal of ammonia from an aqueous medium by contact with either natural or synthetic zeolite. The spent zeolite is regenerated for continuous use, while the ammonia is concentrated as ammonium sulfate, and ultimately destroyed via combustion. A system for monitoring and maintaining an ammonia removal system by an off-site provider is also disclosed.

Abstract: High purity ammonium dimolybdate or molybdenum oxide is produced by the pressure oxidation of low grade molybdenite concentrates or molybdenum intermediates. The process entails nearly complete oxidation of the sulfide minerals while optimizing the process chemistry and autoclave conditions to solubilize as little of the molybdenum values as possible. The autoclave discharge 12 is then subjected to a leaching step, either an alkaline leach 50, 400 or ammonium leach 250 process, before or after a liquid/solid separation step 20, 220, 410. The solution is then subjected to (a) filtration 60, 410, solvent extraction 70, 440, crystallization 90, 450, and calcination 120, 480 or (b) filtration 260, 280, crystallization 290, and calcination 320 to produce a product suitable for chemical-grade molybdenum oxide 125, 325, 485.

Abstract: A process for removing metals from a waste including uranium and a second metal comprising dissolving the uranium and the second metal in a first aqueous solution, removing the dissolved uranium from the first aqueous solution by redissolving in an organic solvent, stripping the uranium from the organic solvent by redissolving in a second aqueous solution, precipitating the uranium from the second aqueous solution, and removing the second metal from the first aqueous solution.