A perspective of stepwise utilisation of Bayer red mud: Step two--Extracting and recovering Ti from Ti-enriched tailing with acid leaching and precipitate flotation

Journal of Hazardous Materials
Yanfang HuangJiongtian Liu

Abstract

The extraction and recovery of Ti from Ti-enriched tailing with acid leaching and precipitate flotation, as one of the critical steps, was proposed for the stepwise utilization of red mud. The factors influencing acid leaching and precipitate flotation were examined by factorial design. The leaching thermodynamics, kinetics of Ti(4+), Al(3+) and Fe(3+), and the mechanism of selectively Fe(3+) removal using [Hbet][Tf2N] as precipitating reagent were discussed. The extracting of Ti(4+), Al(3+) and Fe(3+) in concentrated H2SO4 is controlled by diffusion reactions, depending mainly upon leaching time and temperature. The maximum extracting efficiency of Ti(4+) is approximately 92.3%, whereas Al(3+) and Fe(3+) leaching are respectively 75.8% and 84.2%. [Hbet][Tf2N], as a precipitating reagent, operates through a coordination mechanism in flotation. The pH value is the key factor influencing the flotation recovery of Ti(4+), whereas the dosage of precipitating reagent is that for Al(3+) recovery. The maximum flotation recovery of Ti(4+) is 92.7%, whereas the maximum Al(3+) recovery is 93.5%. The total recovery rate for extracting and recovering titanium is 85.5%. The liquor with Ti(4+) of 15.5g/L, Al(3+) of 30.4g/L and Fe(3+) of 0.48...Continue Reading

References

Feb 26, 2008·Journal of Hazardous Materials·S Agatzini-LeonardouCh Markopoulos
Mar 17, 2009·Journal of Hazardous Materials·I VangelatosD Boufounos
Sep 9, 2009·Journal of Hazardous Materials·Li ZhongYi Zhang
Sep 23, 2014·Journal of Hazardous Materials·Guanghui LiYuanbo Zhang
Oct 2, 2014·Waste Management·Yanju Liu, Ravi Naidu
Sep 6, 2015·Journal of Hazardous Materials·Yanfang HuangWenjuan Wang

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