CAJ | 학술논문

开发碳酸钠碱熔焙烧预处理红土镍矿的新工艺，对红土镍矿碱熔脱除铬和铝动力学以及矿石粒度和碱矿质量比、焙烧温度等影响铬和铝浸出率的因素进行系统研究。结果表明：在矿石粒度为44~74μm、碱矿质量比为0.6：1和焙烧温度为1000°C的条件下，铬和铝的浸出率分别达到99%和82%以上。在600?800°C温度范围内，除铬反应受产物层扩散控制，其表观活化能为3.9 kJ/mol；在900~1100°C温度范围内，除铬反应受表面化学反应控制，其表观活化能为54.3 kJ/mol。此外，在600~1100°C温度范围内，除铝反应受Avrami内扩散控制，其表观活化能为16.4 kJ/mol。在后续对碱熔渣进行加压酸浸过程中，镍和钴的浸出率分别达到96.8%和95.6%。
개발탄산납감용배소예처리홍토얼광적신공예，대홍토얼광감용탈제락화려동역학이급광석립도화감광질량비、배소온도등영향락화려침출솔적인소진행계통연구。결과표명：재광석립도위44~74μm、감광질량비위0.6：1화배소온도위1000°C적조건하，락화려적침출솔분별체도99%화82%이상。재600?800°C온도범위내，제락반응수산물층확산공제，기표관활화능위3.9 kJ/mol；재900~1100°C온도범위내，제락반응수표면화학반응공제，기표관활화능위54.3 kJ/mol。차외，재600~1100°C온도범위내，제려반응수Avrami내확산공제，기표관활화능위16.4 kJ/mol。재후속대감용사진행가압산침과정중，얼화고적침출솔분별체도96.8%화95.6%。
A novel process was proposed for the activation pretreatment of limonitic laterite ores by Na2CO3 roasting. Dechromization and dealumination kinetics of the laterite ores and the effect of particle size, Na2CO3-ore mass ratio, and roasting temperature on Cr and Al extraction were studied. Experimental results indicate that the extraction rates of Cr and Al are up to 99%and 82%, respectively, under the optimal particle size of 44–74μm, Na2CO3-to-ore mass ratio of 0.6:1, and temperature of 1000 °C. Dechromization within the range of 600–800 oC is controlled by the diffusion through the product layer with an apparent activation energy of 3.9 kJ/mol, and that it is controlled by the chemical reaction at the surface within the range of 900–1100 °C with an apparent activation energy of 54.3 kJ/mol. Besides, the Avrami diffusion controlled model with on apparent activation energy of 16.4 kJ/mol is most applicable for dealumination. Furthermore, 96.8%Ni and 95.6%Co could be extracted from the alkali-roasting residues in the subsequent pressure acid leaching process.