Selective enrichment of TiO2 and precipitation behavior of perovskite phase in titania bearing slag

Wang, Mingyu; Zhang, Linnan; Zhang, Li; Zhitong, Sui; Tu, Ganfeng

doi:10.1016/s1003-6326(06)60072-1

Cited by 66 publications

(27 citation statements)

References 3 publications

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“…[3][4][5] On this occasion, the selective crystallization and phase separation (SCPS) method was taken into consideration. [6][7][8] The main factors of this method are to enrich the phosphorus into a certain phase and to make the enriched phase grow large enough through composition modification. Thereafter, the steelmaking slags, separated from the phosphorous enriched phase, can be efficiently and economically reused.…”

Section: Introductionmentioning

confidence: 99%

Viscous Flow and Crystallization Behaviors of P-bearing Steelmaking Slags with Varying Fluorine Content

et al. 2016

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The role of fluorine in the CaO-SiO 2 -MgO-Al 2 O 3 -Fe t O steelmaking slags was investigated through analyzing the viscous flow and crystallization behaviors of the slags. It was found that the viscosity decreased with increasing CaF 2 content, which resulted from the decrease of the degree of polymerization (DOP) of the structures, as proved by O 1s X-ray photoelectron spectroscopy (XPS) and magic angular spinning nuclear magnetic resonance (MAS-NMR) analysis. The continuous cooling transformation (CCT) diagrams of the primary crystals were also constructed. The results showed that CaF 2 addition promoted the transformation of the primary crystal from spinel (MgFe 2 O 4 ) to flourapatite (Ca 5 (PO 4 ) 3 F), which was beneficial to the further enrichment of phosphorus. According to 19 F MAS-NMR results, F − ions mainly coordinate with Ca 2 + ions to form Ca-F bond. Furthermore, considering the greater stability of P-O-Ca than that of Si-OCa bonds, most of the F − ions behave as F-Ca-O-P band, which thus enhanced the formation of Ca 5 (PO 4 ) 3 F. Additionally, the non-isothermal crystallization kinetics was further analyzed and the activation energy for the primary crystal growth was derived.

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Section: Introductionmentioning

confidence: 99%

Viscous Flow and Crystallization Behaviors of P-bearing Steelmaking Slags with Varying Fluorine Content

et al. 2016

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“…Owing to the low TiO 2 content and complex mineral phases in the slag, the TiO 2 is difficult to recover. As a result, approximately 7400 Mt of titaniferous slag has been stacked as solid waste, which has led to a considerable loss of titanium resources and environmental pollution (Huang et al, 2013;Jiao et al, 2018;Wang et al, 2006;Wen and Zhang, 2011). Therefore, it is of considerable importance to develop effective methods for the comprehensive utilization of the titanium resource in vanadium titanomagnetite concentrate.…”

Section: Introductionmentioning

confidence: 99%

Upgrading of raw vanadium titanomagnetite concentrate

Bai

2019

J. S. Afr. Inst. Min. Metall.

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In view of the continuous depletion of titanium, rutile, and ilmenite mineral deposits, the search for cost-effective practices for titanium production using vanadium titanomagnetite as raw material has become increasingly important. In this study, vanadium titanomagnetite concentrate obtained from the Panzhihua area in China was upgraded via fine grinding followed by magnetic separation to produce high-quality vanadium titanomagnetite concentrate. The potential utilization of this concentrate was investigated. Mineral liberation analysis and electron microprobe analysis were used to investigate the deportment of the impurities and major minerals. Experimental results showed that magnetic separation increased the Fe grade by 4% compared with the raw concentrate, while the total content of Al 2 O 3 , SiO 2 , MgO, and CaO impurities decreased from 12.35% to 7.73%. Process mineralogy studies confirmed that the proportion of titanomagnetite in the high-quality vanadium titanomagnetite concentrate increased to 95.84%. Spinel and sphene were enclosed in the titanomagnetite particles at the nanometre scale, which would make them practically impossible to remove through mineral processing techniques.

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“…During past decades, many methods have been developed to extract Ti from Ti-BF slags, such as acid leaching, 3,4) alkaline molten salt method, 5,6) carbide-chloride method 7,8) and selective crystallization and phase separation (SCPS) method. 9,10) Currently, SCPS method has been thought as one of the most promising methods, which can enrich Ti element into a selected crystalline phase, which makes the extraction of titanium become feasible. Rutile is regarded as an appropriate enriched phase for SCPS method because of its rod-shape structure, high density and high content of Ti.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Rutile Formation by ZrO<sub>2</sub> Addition in Ti-bearing Blast Furnace Slags

Sun

Liu

et al. 2015

ISIJ Int.

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Enhancement of rutile crystallization in Ti-bearing Blast Furnace (Ti-BF) Slag caused by various ZrO 2 additions was clarified by Single Hot Thermocouple Technique (SHTT). Time-temperature-transformation (TTT) curves were obtained to analyze the variation trend of crystallization behavior. The results showed that the incubation time of primary crystal, i.e., rutile, at high temperature was first prolonged with increasing ZrO 2 addition from 0 to 3 wt.%, and then visibly shortened with further addition of ZrO 2 up to 5 wt.%. However, final amount of crystal precipitated was monotonously enhanced by the increasing ZrO 2 addition. Meanwhile, Fourier Transform Infrared spectroscopy (FTIR) test was applied to investigate structure of the slag and it was found that degree of polymerization (DOP) for the slag was enhanced and the structural group related to Zr-O-Zr group became more pronounced with increasing ZrO 2 concentration, which agreed well with the variation trend of the crystallization behaviors of slags. These results have highlighted that addition of ZrO 2 could enhance rutile crystallization, which is of great importance for potentially extracting Ti element from the slag.

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Selective enrichment of TiO2 and precipitation behavior of perovskite phase in titania bearing slag

Cited by 66 publications

References 3 publications

Viscous Flow and Crystallization Behaviors of P-bearing Steelmaking Slags with Varying Fluorine Content

Viscous Flow and Crystallization Behaviors of P-bearing Steelmaking Slags with Varying Fluorine Content

Upgrading of raw vanadium titanomagnetite concentrate

Enhancement of Rutile Formation by ZrO<sub>2</sub> Addition in Ti-bearing Blast Furnace Slags

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