Mineral oxidation leaching in the anode area is the key step in slurry electrolysis. By adopting the slow linear potential scanning method during slurry electrolysis

this study investigated the steady-state polarization curve of a pure stibnite mineral on a graphite anode. In addition

the influence of the mineral particle size

liquid–solid ratio

stirring speed

and temperature on the collision oxidation of the mineral with the anode was studied. Based on the different oxidation reactions

the potential range can be divided into three intervals: the low-potential interval with a potential lower than 0.75 V

an intermediatepotential interval with a potential within 0.75–1.2 V

and a high-potential interval with a potential higher than 1.2 V. The collision oxidation of the mineral with the anode occurred in all three intervals. The oxidation of Sb(III) also appeared in the intermediate- and high-potential intervals

and chlorine evolution occurred in the high-potential interval. Therefore

the low-potential interval was determined to be a suitable potential interval for the slurry electrolysis process. In the low-potential interval

the particle size

liquid–solid ratio

and stirring speed had little effect on the o

xidation rate of the minerals. As the temperature increased

the stibnite oxidation rate and exchange current density increased. Overall

the direct collision oxidation rate of stibnite was relatively low and the current densities under all the investigated conditions were lower than 0.4 mA·cm

-2

. This indicates that it is difficult to realize industrial production while relying solely on this process.