Process for the production of titanium concentrate from anatase ores with high utilization of the iron contents of the ore
AssigneeCompanhia Vale Do Rio Doce
InventorsMarcelo De Matos, Lino Rodrigues De Freitas, Ronaldo De Moreira Horta
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Abstract
A process for the production of titanium concentrates from anatase ores with high utilization of the iron contents of the raw ore involving the steps of calcining mechanically treated ore in the presence of an alkali metal carbonate followed by dilute leachings in both alkaline and acid media. No reducing agents are employed during calcination, avoiding the iron contents of the ore to be solubilized in the leaching steps. The final concentrate, which is rich in titanium and iron and has a low content of impurities, can be used as a raw material for the production of titanium slag.
Claims15
A process for producing titanium concentrate, wherein the predominant titanium source is anatase ore, comprising the steps of:
- calcining mechanical concentrate of anatase ore in the presence of sodium carbonate (Na2CO3) and/or potassium carbonate (K2CO3) to obtain a calcined product,
- crushing the calcined product to a particle size below 1 mm to obtain a crushed product,
- leaching the crushed product in alkaline medium with a pH in excess of 10, followed by leaching said crushed product in acid,
- wherein said acid leached product has a Fe2O3 content in the range of 40.5 to 41.1 weight percent.
A process for producing titanium concentrate, comprising the steps of:
- calcining mechanical concentrate of anatase ore in the presence of sodium carbonate (Na2CO3) and/or potassium carbonate (K2CO3) to obtain a calcined product,
- crushing the calcined product to a particle size below 1 mm to obtain a crushed product,
- leaching the crushed product in alkaline medium with a pH in excess of 10, followed by leaching the crushed product in acid,
- wherein said acid leached product has a Fe2O3 content in the range of 40.5 to 41.1 weight percent.
A process for producing titanium concentrate, wherein the predominant titanium source is anatase ore, comprising the steps of:
- disintegrating the anatase ore and screening to produce a classified ore size above 48 mesh,
- subjecting the classified ore to magnetic separation for removing magnetic fraction to obtain non magnetic fraction,
- subjecting the non magnetic fraction to a slime removal operation and then classifying and discarding the minus 200 mesh fraction to produce a mechanical concentrate,
- calcining the mechanical concentrate in the presence of sodium carbonate (Na2CO3) and/or potassium carbonate (K2CO3) to obtain a calcined product,
- crushing the calcined product to a particle size below 1 mm to obtain a crushed product,
- leaching the crushed product in alkaline medium with a pH in excess of 10, followed by leaching said crushed product in acid,
- wherein said acid leached product has a Fe2O3 content in the range of 40.5 to 41.1 weight percent.
Dependencies are inferred from the claim text.