Melting Separation Behavior and Mechanism of High-chromium Vanadium–bearing Titanomagnetite Metallized Pellet Got from Gas-based Direct Reduction

Melting Separation Process of High Chromium Vanadium-bearing Titanomagnetite Metallized Pellet and its Optimization by Multi-Index Synthetic Weighted Scoring Method

“…The C/O is defined as the mole ratio of carbon to reducible oxygen in iron, vanadium, chromium, and titanium oxides. According to the early work by author, 21) the amount of carbon in the work is based on C/O of 1.20 for sufficient deep reduction and carburization. The basicity defined as CaO/SiO 2 is the mass fraction ratio of CaO to SiO 2 in raw material.…”

“…Taking the basicity of 1.10 as an example, if the basicity is adjusted to 1.10, the mass of addition CaO is 3.08 g ((0.34 + x)/3.11 = 1.10, x = 3.08 g). And considering the slag with good fluidity and the erosion to brusque based on the early work by author, 21) the addition of CaF 2 in the work is 2% (100 g HCVTMP, 2 g CaF 2 ).…”

“…18,19) Due to the previously discussed low recovery rate, high energy consumption, and slag pollution by solid reductant during BF or coal-based direct process, a new gas based reduction-melting process for HCVT has been proposed and researched by authors' team. 2,20,21) From the previous work by author, 21) it has been proved that the iron containing V and Cr together with the slag bearing Ti can be obtained by the new process. Also, the effect rules of key parameters on high chromium vanadium-bearing titanomagnetite metallized pellet (HCVTMP) melting separation are investigated by the single index test.…”

“…From the previous single index test, 21) the rough ranges of HCVTMP melting separation parameters are obtained: melting temperature (the set temperature of melting separation test ) is around 1 625°C, melting time (the holing time under the set melting temperature) is about 40-50 min, and basicity (CaO/SiO 2 ) is approximately kept at 1.10. But for a multi-index evaluation system, the optimal parameters gotten from single index test are not enough and imprecise, the scientific test should be designed and carried out.…”

Coupled Effect of Valuable Components in High-Chromium Vanadium-bearing Titanomagnetite during Oxidization Roasting

“…As increased TiO 2 together with the iron containing V and Cr is obtained. 6,12,13) No matter BF or gas-based shaft furnace, pellet as one major burden presents many advantages, such as uniform size, high physical strength, and low degradation. Metallurgical performances of pellet play a vital role in increasing productivity, therefore, many researchers pay much attention to them such as compressive strength (CS) and reduction swelling index (RSI) affected by inner structure and chemical composition.…”