| 摘要 |
<p>Methods to control hydrogen sulfide and/or arsine emissions are described. The method involves adding at least one copper compound (such as a copper (II) compound) to the material, such as material containing sulfur in a sufficient amount to control said emissions. The material that is treated with the copper compound(s) is preferably an ore, such as a valve metal containing ore, such as tantalum-bearing ore. More in particular, the method involves adding copper oxide during the digestion of Ta ore material with hydrofludic acid.</p> |
