Effects of high pressure roller grinding on size distribution of vanadium-titanium magnetite concentrate particles and improvement of green pellet strength

2017 ◽  
Vol 24 (3) ◽  
pp. 266-272 ◽  
Author(s):  
Feng Chen ◽  
Yu-feng Guo ◽  
Tao Jiang ◽  
Fu-qiang Zheng ◽  
Shuai Wang ◽  
...  
Keyword(s):  
High Pressure ◽  
Size Distribution ◽  
Green Pellet ◽  
Pellet Strength ◽  
Magnetite Concentrate ◽  
Vanadium Titanium ◽  
Titanium Magnetite

Study on Cold-Pressing Technology for Mixture of Iron Ore and Coal

2011 ◽  
Vol 117-119 ◽  
pp. 882-886
Author(s):  
Jie Qin ◽  
Gong Guo Liu ◽  
Fei Hu Long
Keyword(s):  
High Pressure ◽  
Industrial Production ◽  
Iron Ore ◽  
Cold Pressing ◽  
Comprehensive Utilization ◽  
Vanadium Titanium ◽  
Titanium Magnetite ◽  
Pressing Technology

Operation principle of high-pressure briquetter is introduced. According to the problems arised from real production in pilot named as comprehensive utilization of vanadium-titanium magnetite, countermeasures have been proposed to solve these problems. At the base of carrying out a series of reformations on the equipments and now the high-pressure briquetter can meet the requirements of industrial production.

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

Grinding Kinetics of Vanadium-Titanium Magnetite Concentrate in a Damp Mill and Its Properties

2016 ◽  
Vol 47 (3) ◽  
pp. 1765-1772 ◽  
Author(s):  
Hongming Long ◽  
Tiejun Chun ◽  
Ping Wang ◽  
Qingmin Meng ◽  
Zhanxia Di ◽  
...  
Keyword(s):  
Magnetite Concentrate ◽  
Vanadium Titanium ◽  
Grinding Kinetics ◽  
Kinetics Of ◽  
Titanium Magnetite

scholarly journals Particle Size Effects on Selectivity in Confined Bed Comminution

Minerals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 342
Author(s):  
Holger Lieberwirth ◽  
Lisa Kühnel
Keyword(s):  
Particle Size ◽  
High Pressure ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Size Effects ◽  
Experimental Investigations ◽  
Ore Processing ◽  
Tumbling Mills ◽  
Particle Bed ◽  
Vertical Roller

Confined bed comminution in high-pressure grinding rollers (HPGRs) and vertical roller mills (VRMs) was previously used preferably for grinding comparably homogeneous materials such as coal or clinker. Meanwhile, it started to complement or even replace tumbling mills in ore beneficiation with ore and gangue particles of rather different breakage behaviors. The selectivity in the comminution of a mixture of particles with different strengths but similar particle size distribution (PSD) of the constituents in a particle bed was investigated earlier. The strength of a material is, however, also a function of particle size. Finer particles tend to be more competent than coarser ones of the same material. In industrial ore processing using confined bed comminution, this effect cannot be neglected but even be exploited to increase efficiency. This paper presents research results on this topic based on experimental investigations with model materials and with natural particles, which were stressed in a piston–die press. It appeared that the comminution result substantially depends on the material characteristics, the composition of the mixture and the PSD of the constituents. Conclusions will be drawn for the future applications of selective comminution in mineral processing.

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