1. Acid leaching from mines and mechanical processing of ore speed up the process.2. Raw lunar regolith would be refined by a variety of techniques, primarily hydrofluoric acid leaching . 3. This facility produced thorium, radium, and uranium by acid leaching of monazite sands and other ores. 4. Mg is used as a reactant in order to allow for acid leaching of unwanted oxide products. 5. Proposals to carry on mining by sulfuric acid leaching were considered but these were shelved in 1997. 6. That plant also uses acid leaching . 7. The Husab Mine is to start production in early December 2015 after completion of the sulfuric acid leaching plant. 8. Instead, erosion ate away at it, in the form of acid leaching , and broke down much of its pumice content. 9. These reactions are exothermic and can be used to produce the diborides by SHS . Production of ZrB 2 from acid leaching . 10. Mining started in 1997 and is again a conventional truck and shovel operation followed by crushing, pre treatment and stacking before acid leaching .
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