Reduction Behaviour of Vanadium-Titanium-Magnetite Concentrate Pellets Containing Carbon at High-Temperature and Quick-Speed

2016 ◽  
Vol 13 (4) ◽  
pp. 2290-2295
Author(s):  
Songli Liu ◽  
Kuisong Zhu ◽  
Pan Huang ◽  
Li Cao
Keyword(s):  
High Temperature ◽  
Magnetite Concentrate ◽  
Reduction Behaviour ◽  
Vanadium Titanium ◽  
Titanium Magnetite

scholarly journals Mechanism of Novel K2SO4/KCl Composite Roasting Additive for Strengthening Vanadium Extraction from Vanadium–Titanium Magnetite Concentrate

Minerals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 426
Author(s):  
Renmin Li ◽  
Tao Liu ◽  
Yimin Zhang ◽  
Jing Huang
Keyword(s):  
Sulfuric Acid Concentration ◽  
X Ray Diffraction ◽  
Volume Percentage ◽  
Solid Ratio ◽  
Vanadium Extraction ◽  
Magnetite Concentrate ◽  
Main Decomposition ◽  
Vanadium Titanium ◽  
Hematite Fe2o3 ◽  
Titanium Magnetite

In this paper, a novel K2SO4/KCl composite roasting additive was used to extract vanadium from vanadium–titanium magnetite concentrate. Further, the mechanism of K2SO4/KCl for extracting vanadium was studied. The results indicate that the vanadium leaching efficiency reached 82.04%, an increase of 7.43% compared to that of single K2SO4 and 10.05% compared to single KCl under the following conditions: a total dosage of K2SO4/KCl of 7 wt % with a mass ratio of 6/4, a roasting temperature of 950 °C, a roasting time of 1 h, a leaching temperature of 95 °C, a sulfuric acid concentration of 10% (v/v: volume percentage), and a leaching time of 1.5 h with a liquid-to-solid ratio of 3 mL/g. Moreover, crystal chemistry analyses indicated that the essence of the vanadium extraction with roasting was the conversion of cubic crystal systemic vanadium-bearing magnetite (FeO(Fe,V)2O3) to trigonal crystal systemic hematite (α-Fe2O3), and as most Fe(V)–O bonds were broken with the reconstructed conversion, the dissociation of V(III) occurred. Furthermore, the main decomposition products of K2SO4/KCl were K2O, SO2, and Cl2. X-ray diffraction (XRD) and related SEM-EDS analyses indicated that there were mainly three aspects in the mechanism of K2SO4/KCl for extracting vanadium. Firstly, activated K2O could combine with vanadium to generate soluble KVO3 rather insoluble Ca(VO3)2; secondly, SO2 could react with CaO to form CaSO4 to prevent the generation of acid-consuming Ca(VO3)2, which was beneficial to the dissolution of vanadium-bearing sphene (Ca(Ti,V)SiO4O); thirdly, Cl2 could destroy the structure of hematite (Fe2O3) to reduce its wrapping extent to KVO3.

scholarly journals Efficient Extraction of Vanadium from Vanadium–Titanium Magnetite Concentrate by Potassium Salt Roasting Additives

Minerals ◽  
2018 ◽  
Vol 8 (1) ◽  
pp. 25 ◽  
Author(s):  
Renmin Li ◽  
Tao Liu ◽  
Yimin Zhang ◽  
Jing Huang ◽  
Chengbao Xu
Keyword(s):  
Potassium Salt ◽  
Magnetite Concentrate ◽  
Efficient Extraction ◽  
Vanadium Titanium ◽  
Titanium Magnetite

scholarly journals Experimental Study of the Effect of B2O3 on Vanadium-Titanium Magnetite Concentrates Pellets

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Hao Liu ◽  
Ke Zhang ◽  
Henrik Saxén ◽  
Weiqiang Liu ◽  
Yuelin Qin ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Experimental Study ◽  
Compressive Strength ◽  
High Temperature ◽  
Area Ratio ◽  
Reduction Degree ◽  
Metallurgical Properties ◽  
Vanadium Titanium ◽  
Titanium Magnetite ◽  
Compaction Degree

This paper aims to improve the metallurgical properties of vanadium-titanium magnetite (VTM) concentrates pellets by applying solid waste containing B2O3. Thus, the effects of adding B2O3 on the drop strength, compressive strength, pores area ratio, high-temperature metallurgical properties, and microstructure of VTM pellets were studied through pelletizing and roasting experiments. Results show that the addition of B2O3 reagent is not conducive to the increase of the drop strength of the green pellets. Nevertheless, the compressive strength and fracture toughness of the roasted pellets can be improved by adding more B2O3 during the pelletizing. The reduction degree of VTM pellets is firstly decreased and then increased with the added B2O3 amount. It is possible to improve the compaction degree and restrain the reduction-pulverization degree of the pellet by a low amount of additive (B2O3). The reduction-expansion performance of VTM pellets, in turn, can be raised by adding B2O3.

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