添加含氟炭渣对铝电解用炭阳极反应性的影响OA

Four types of fluorine-containing carbon residue have been added to the carbon anode at mass fractions of 5％,10％,15％,and 20％.The residual rate and reaction activity of the carbon anode have been calculated after reaction in air at 600℃and CO2 atmosphere at 960 ℃ to determine the reactivity of the carbon anode.The results show that as the mass fraction of fluorine-containing carbon residue increases to 5％,10％,15％,and 20％,Na3AlF6 carbon residue consistently enhances the air reactivity of the carbon anode,while its effect on the CO2 reactivity of the carbon anode first decreases and then increases.The mixed carbon residue of Na3AlF6 and AlF3 initially reduces and subsequently increases the air reactivity of the carbon anode,but continuously improves the CO2 reactivity of the carbon anode.The mixed carbon residue of Na3AlF6 and NaF first decreases and then increases the air reactivity of the carbon anode,while consistently enhancing the CO2 reactivity of the carbon anode.The MgF2 carbon residue caused both the air and CO2 reactivity of the carbon anode to decrease initially and then increase with rising additions.Compared with carbon anode raw materials,fluorine-containing carbon residue has a more significant improvement effect on the oxidation of pitch coke,and can also rearrange the molecular structures of calcined petroleum coke and pitch coke,increase the degree of carbonization,and thus affect the reactivity of carbon anode in air and CO2 atmosphere.