| 摘要 |
TiO2 ore is purified by roasting with an alkali metal compound and leaching with a nonsulfuric mineral acid. If undesirable iron containing minerals are present in the ore, carbon can be incorporated in the roasting step followed by magnetic separation to remove the iron containing minerals. Or, to remove the iron containing minerals, the ore can be subjected to a separate iron removing process which consists of roasting with carbon, followed by magnetic separation. The separate iron removing process can be done before or after the roasting with an alkali metal compound. The purified TiO2 can be used for any process where a purified ore is desired. Preferred is using the ore to make TiO2 pigment. |
