Abstract
The effects of high-basicity pellet on smelting chromium-bearing vanadia-titania magnetite are investigated via thermodynamic smelting and non-isothermal kinetics experiments. The thermodynamic results indicated that the high-basicity pellet significantly affects and ameliorates the softening-melting-dripping behaviors during the smelting process. As the high-basicity pellet ratio increased from 0 wt.% to 52 wt.%, the range of softening temperature [T40–T4] decreased from 121 °C to 84 °C and the melting-dripping temperature [Td–Ts] decreased from 224 °C to 169 °C. Moreover, the apparent activation energy of non-isothermal kinetics also decreased from 99.91 kJ·mol−1 to 66.74 kJ·mol−1. Additionally, the reaction mechanism of high-basicity pellet on smelting chromium-bearing vanadia-titania magnetite was investigated via thermodynamic calculations of Gibbs free energy and characterizations of the titanium slag. Therefore, combined with the lowest permeability index, the fastest non-isothermal reduction rate, the highest recovery of valuable elements and the minimum content of titanium carbonitride, the preferable high-basicity pellet ratio was considered to be 11~23 wt.%.
Highlights
Accepted: 4 May 2021As a unique polymetallic resource, chromium-bearing vanadia-titania magnetite (CVTM) contains iron, vanadia, titania and has associated chromium resources with a highly comprehensive utilization value
A preferable basicity pellet (BP) ratio is determined based on thermodynamic melting experiments, non-isothermal kinetic pellet experiments thermodynamic calculations and
The experimental results ofHowever, softening-melting-dripping characteristics showed as on the the thermodynamic parameters, the permeability index, the recovery of valuable elements ratio of high-basicity pellet increased from 0 wt.% to 52 wt.%, the softening zone [T40–T4]
Summary
As a unique polymetallic resource, chromium-bearing vanadia-titania magnetite (CVTM) contains iron, vanadia, titania and has associated chromium resources with a highly comprehensive utilization value. The blast furnace process for the comprehensive utilization of chromium-bearing vanadia-titania magnetite based on pyrometallurgy separation has been systematically established in China [1,2]. For the CVTM blast furnace smelting behavior with a high-basicity pellet, few corresponding kinetics studies have been conducted. The pellet and sinter coexist and interact in the blast furnace smelting process. The reduction kinetics of a single sample cannot directly guide the blast furnace smelting production of CVTM. This study attempts to reveal the metallurgical reaction kinetics of CVTM smelting with a high-basicity pellet
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