domestic nonbauxitic raw materials. Two of the processes were based on alunite [K2SO4Al2(SO4):!-4Al(OH):i], and dawsonite [NaAl(OH)2CO:!], minerals that are unlikely to be found on the Moon, so they will not be discussed here. If discussion is restricted to the aluminosilicate minerals, which have been shown to be typical constituents of moon rocks and soils, there are three approaches for recovering alumina: • acid (hydrochloric, nitric, sulfuric, or sulfurous) leaching-thermal decomposition • alkaline sintering-caustic leaching • carbochlorination
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