| 摘要 |
<p>1488747 Molybdenum oxide; ammonium molybdate AMAX Inc 17 Oct 1975 [23 Dec 1974] 42644/75 Heading ClA Molybdenum values are recovered from ores and concentrates by (a) grinding to less than 100 mesh, (b) roasting in an at least 40% oxygen atmosphere to give MoO 3 and metal molybdates, (c) leaching out metal molybdates with hot water, (d) separating the leach liquor and recovering molybdate ions in soluble or insoluble form and subsequently feeding soluble molybdate to step (e) or returning insoluble molybdate to step (a), (e) contacting the insoluble residue from (d) with aqueous ammoniacal solution to give ammonium molybdate solution and (f) separating the insoluble residue from step (e) and recovering the ammonium molybdate from the solution. This may be decomposed to give pure MoO 3 .</p> |
