| 摘要 |
<p>A process for enhancing ilmenite from deposits of mineral sands or mineral concentrates comprises a single stage fluidised bed magnetising roast (16). A temperature of 650 DEG C - 900 DEG C in an excess of a carbonaceous fuel (such as coal/char, CO or hydrocarbon) is used to provide an atmosphere in which the oxygen potential is controlled resulting in a consistently high magnetic susceptibility product. Roasting has been used before but the current process requires a lower intensity magnetic separation stage (18) and provides improved recovery (even of tailings produced by prior art roasting process). Annealing (17) of the roasted product improves the resultant magnetic susceptibility. Ilmenites having inclusions or selvedges of silicate minerals are further improved by employing a grinding step after magnetic separation prior to slagging or use as synthetic rutile feedstock. The roasting stage potentiates the ilmenite for leaching in the production of synthetic rutile.</p> |
