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Article

The Manufacture of Synthetic Rutile by Solvent Extraction of Tri-Alkyl Phosphine Oxide from HCl Leaching Solution of Soda-Roasted Ilmenite Ore

by
Sung-Ho Joo
1,
Dong Ju Shin
1,
Dongseok Lee
1,2,
Jungshin Kang
2,3,
Min-seuk Kim
1,2,
Hoseok Jeon
1,2,
Jin-Tae Park
1 and
Shun Myung Shin
1,2,*
1
Resources Recovery Research Center, Korea Institute of Geoscience and Mineral Resources, Daejeon 34132, Korea
2
Resource Recycling Department, University of Science & Technology, Daejeon 34113, Korea
3
Strategic Minerals Utilization Research Department, Korea Institute of Geoscience and Mineral Resources, Daejeon 34132, Korea
*
Author to whom correspondence should be addressed.
Metals 2020, 10(5), 588; https://doi.org/10.3390/met10050588
Submission received: 8 April 2020 / Revised: 24 April 2020 / Accepted: 28 April 2020 / Published: 29 April 2020
(This article belongs to the Special Issue Separation and Leaching for Metals Recovery)
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Abstract

To manufacture TiO2, a high-purity synthetic rutile, the recovery of Ti was investigated using a hydro-metallurgical process. Using a feed solution containing 32050 mg/L Ti, 110 mg/L Si, 88 mg/L Nb, 2614 mg/L Fe, and 130 mg/L Zr, solvent-extraction experiments were conducted with alkyl phosphine oxide in conjunction with diluents such as kerosene and xylene. The results showed that the extraction mechanism of both diluents was very similar to slope analysis, which had a value of 1.9; however, the extraction equilibrium constant value of organic–metallic species in xylene as a diluent was lower than in kerosene as a diluent. This result affected the stripping efficiency of Ti in particular; therefore, xylene was selected as a diluent. To recover Ti ion from a leaching solution, a series of experiments was conducted, such as the McCabe–Thiele method and countercurrent simulation test for extraction and stripping of Ti. As a result, Ti and impurities such as Fe and Zr were extracted to 99.9% from Si and Nb under optimal conditions using countercurrent four-stage extraction, with 1 M Cyanex 923 at a ratio of organic phase/ aqueous phase=3. In the stripping test, Ti was selectively stripped to 90.1% from Fe and Zr in the organic phase by 1 M HCl. The obtained powder, which was hydrolyzed from an impurity-free solution, was analyzed to a purity of 99.9% by inductively coupled plasma. The TiO2, which has a spherical shape and a diameter of approximately 2 µm according to SEM, was evident by XRD.
Keywords: TiO2; alkyl phosphine oxide; kerosene; xylene; solvent extraction TiO2; alkyl phosphine oxide; kerosene; xylene; solvent extraction

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MDPI and ACS Style

Joo, S.-H.; Shin, D.J.; Lee, D.; Kang, J.; Kim, M.-s.; Jeon, H.; Park, J.-T.; Shin, S.M. The Manufacture of Synthetic Rutile by Solvent Extraction of Tri-Alkyl Phosphine Oxide from HCl Leaching Solution of Soda-Roasted Ilmenite Ore. Metals 2020, 10, 588. https://doi.org/10.3390/met10050588

AMA Style

Joo S-H, Shin DJ, Lee D, Kang J, Kim M-s, Jeon H, Park J-T, Shin SM. The Manufacture of Synthetic Rutile by Solvent Extraction of Tri-Alkyl Phosphine Oxide from HCl Leaching Solution of Soda-Roasted Ilmenite Ore. Metals. 2020; 10(5):588. https://doi.org/10.3390/met10050588

Chicago/Turabian Style

Joo, Sung-Ho, Dong Ju Shin, Dongseok Lee, Jungshin Kang, Min-seuk Kim, Hoseok Jeon, Jin-Tae Park, and Shun Myung Shin. 2020. "The Manufacture of Synthetic Rutile by Solvent Extraction of Tri-Alkyl Phosphine Oxide from HCl Leaching Solution of Soda-Roasted Ilmenite Ore" Metals 10, no. 5: 588. https://doi.org/10.3390/met10050588

APA Style

Joo, S.-H., Shin, D. J., Lee, D., Kang, J., Kim, M.-s., Jeon, H., Park, J.-T., & Shin, S. M. (2020). The Manufacture of Synthetic Rutile by Solvent Extraction of Tri-Alkyl Phosphine Oxide from HCl Leaching Solution of Soda-Roasted Ilmenite Ore. Metals, 10(5), 588. https://doi.org/10.3390/met10050588

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