Yang Zixuan, Ma Yuanlin, Wang Shuting, Bi Tingtao
Yunnan Academy of Ecological and Environmental Sciences Kunming 650034 China.
School of Land and Resources Engineering, Kunming University of Science and Technology Kunming 650093 China.
RSC Adv. 2025 Sep 1;15(38):31230-31239. doi: 10.1039/d5ra02448j. eCollection 2025 Aug 29.
A process route combining flotation for recovering easily floatable sulfide copper minerals and oxygen pressure acid leaching (OPAL) was employed to comprehensively recover valuable metals (Cu, Mo, Fe, ) from copper smelting slag with a high oxidation degree. The oxidative leaching process selectively dissolved and recovered Cu and Mo while transforming Fe into leach residue, rendering it suitable as a raw material for iron and steel smelting. Under optimal conditions, the leaching recoveries for Cu and Mo reached 96.87% and 95.39%, respectively, with over 90% of Fe in the residue phase. Kinetic studies revealed that the OPAL process conforms to the shrinking core model without a solid product layer. The leaching rate was initially controlled by the chemical reaction, transitioned to mixed control during the intermediate stage, and was finally governed by diffusion through the solid product layer in the later stage. Based on this, the kinetic equations for Cu and Mo leaching during the chemically controlled stage were fitted and calculated, and the reaction model was established.
采用浮选回收易浮硫化铜矿物与氧压酸浸（OPAL）相结合的工艺路线，从高氧化度的铜冶炼渣中综合回收有价金属（铜、钼、铁）。氧化浸出过程选择性地溶解并回收了铜和钼，同时将铁转化为浸出渣，使其适合作为钢铁冶炼的原料。在最佳条件下，铜和钼的浸出回收率分别达到96.87%和95.39%，残渣相中铁的含量超过90%。动力学研究表明，氧压酸浸过程符合无固体产物层的收缩核模型。浸出速率最初由化学反应控制，中间阶段转变为混合控制，后期最终由通过固体产物层的扩散控制。基于此，拟合计算了化学控制阶段铜和钼浸出的动力学方程，并建立了反应模型。
