Process Optimization and Reaction Mechanism of Removing Copper From an Fe-Rich Pyrite Cinder Using C

• 作 者: LIU Jian WEN Shu-ming CHEN Yu LIU Dan BAI Shao-jun WU Dan-dan
• 机 构: Faculty of Land Resource Engineering,Kunming University of Science and Technology,Dongbao District A
• 出 处: Journal of Iron and Steel Research(International)
• 发表日期: 2013年08期
• 关键词: process optimization chlorination roasting pyrite cinder removing copper

The aim is to remove copper from a pyrite cinder by optimizing the chlorination roasting process using response surface methodology (RSM) and the reaction mechanism of chlorination roasting based on thermodynamic calculation was discussed.A quadratic model was suggested by RSM to correlate the key parameters,namely,dosage of chlorinating agent,roasting temperature and roasting time to the copper volatilization ratio.The results indicate that the model is well consistent with the experimental data at a correlation coefficient (R2) of 0.95,and the dosage of chlorinating agent and roasting temperature both have significant effects on the copper volatilization ratio.However,a roasting temperature exceeding 1 170 ℃ decreases the volatilization ratio.The optimum conditions for removing copper from the cinder were identified as chlorinating agent dosage at 5%,roasting temperature at 1 155.10 ℃ and roasting time of 10 min; under such a condition,a copper volatilization ratio of 95.16% was achieved from the cinder.Thermodynamic calculation shows that SiO2 in the pellet plays a key role in the chlorine release from calcium chloride,and the chlorine release reactions cannot occur without it.

The aim is to remove copper from a pyrite cinder by optimizing the chlorination roasting process using response surface methodology (RSM) and the reaction mechanism of chlorination roasting based on thermodynamic calculation was discussed. A quadratic model was suggested by RSM to correlate the key parameters, namely, dosage of chlorinating agent, roasting temperature and roasting time to copper volatilization ratio. The results indicate that the model is well consistent with the experimental data at a correlation coefficient (R2) of 0.95, and the dosage of chlorinating agent and roasting temperature Both have significant effects on the copper volatilization ratio. Even, a roasting temperature exceeding 1 170 ℃ decreases the volatilization ratio. The optimum conditions for removing copper from the cinder were identified as chlorinating agent dosage at 5%, roasting temperature at 1 155.10 ° C and roasting time of 10 min; under such a condition, a copper volatilization ratio of 95.16% was achieved from the cinder. thermodynamic analysis shows that SiO2 in the pellet plays a key role in the chlorine release from calcium chloride, and the chlorine release reactions can not occur without it.