CAJ | 학술논문

通过XRD物相分析和热力学分析研究氧化铝的真空碳热还原-氯化-歧化反应.以氧化铝和石墨为原料,在真空下、1643-1843 K的温度范围内进行实验.结果表明,AlCl3(g)与氧化铝碳热还原产生的Al2O(g)或Al(g)反应生成AlCl(g),该AlCl(g)在较低温度下歧化分解为金属铝和AlCl3(g);当压力为100 Pa、温度为980 K时,AlCl(g)的歧化反应率达到90％.生成的金属铝可以吸附催化CO歧化为C和CO2,并可以与CO二次反应形成Al4C3、Al2O3、C和CO2,导致铝产物中含有C、Al4C3和Al2O3.产物铝中所含的这些杂质随着AlCl(g)歧化反应温度的降低而减少.AlCl3(g)在接近室温的温度下冷凝下来.
통과XRD물상분석화열역학분석연구양화려적진공탄열환원-록화-기화반응.이양화려화석묵위원료,재진공하、1643-1843 K적온도범위내진행실험.결과표명,AlCl3(g)여양화려탄열환원산생적Al2O(g)혹Al(g)반응생성AlCl(g),해AlCl(g)재교저온도하기화분해위금속려화AlCl3(g);당압력위100 Pa、온도위980 K시,AlCl(g)적기화반응솔체도90％.생성적금속려가이흡부최화CO기화위C화CO2,병가이여CO이차반응형성Al4C3、Al2O3、C화CO2,도치려산물중함유C、Al4C3화Al2O3.산물려중소함적저사잡질수착AlCl(g)기화반응온도적강저이감소.AlCl3(g)재접근실온적온도하냉응하래.
The carbothermal reduction-chlorination-disproportionation of alumina in vacuum was investigated by XRD and thermodynamic analysis.The experiments on alumina and graphite at 1643-1843 K in vacuum were carried out.The results demonstrate that AlCl3(g) reacts with Al2O(g) or Al(g) generated from the carbothermal reduction of alumina to form AlCl(g),and the AlCl(g) disproportionates to aluminum and AlCl3(g) at a lower temperature and the reaction rate of AlCl(g) reaches 90％ at 980 K and 100 Pa.The aluminum can absorb CO to catalyze its disproportionation to C and CO2,and react backward with CO to form Al4C3,Al2O3,C and CO2,resulting in the aluminum product containing C,A14C3 and Al2O3.The impurities in the aluminum product decrease as the AlCl(g) disproportionation temperature decreases.AlC13 condenses at a temperature approximated to the room temperature.