Kinetics of vanadium reduction from slags by solid carbon

A V Klimov

doi:10.1088/1757-899x/966/1/012018

Abstract

The laboratory investigation results of the vanadium reduction are presented. Experiments were performed with CaO–SiO2–Al2O3–MgO–V2O3 slags in an air atmosphere. The solid carbon was used as a reducing agent. The reduction kinetics was studied by sampling. It has been shown that reduction proceeds to VC carbide. The process rate is inversely proportional to the slag viscosity. The formation of a carbide film on the carbon surface leads to a sudden, by an order of magnitude, reduction in the rate. The process of vanadium reduction from oxide melts by solid carbon is electrochemical in nature and is limited by the stage of carbon anodic oxidation. The influence of slag viscosity on the process kinetics is explained by the fact that it is controlled by the growth rate and removal of gas bubbles. The appearance of the carbide film, apparently, transfers the reduction process into the intra diffusion mode, when the transfer of carbon and vanadium through the carbide film is limiting.

Highlights

To predict the progress of technological processes for the vanadium reduction it is necessary to have a physicochemical model of ones
The reduction of V2O5 and V2O3 from liquid slags with solid carbon was investigated by the gravimetric method [1, 2]
The authors themselves [1, 2] expressed the opinion that the reduction process is limited by the stage of carbon anodic oxidation, and the concentration of vanadium is not included in the kinetic equation

Summary

Introduction

To predict the progress of technological processes for the vanadium reduction it is necessary to have a physicochemical model of ones. The authors themselves [1, 2] expressed the opinion that the reduction process is limited by the stage of carbon anodic oxidation, and the concentration of vanadium is not included in the kinetic equation. The vanadium reduction process by solid carbon continues to remain insufficiently studied, in particular, the influence of the slag composition on the reduction rate has not been disclosed.

Results

Conclusion