Thermodynamic modeling of antimony removal from complex resources in copper smelting process

铜复杂资源熔炼过程中杂质锑脱除的热力学模拟

This work investigated the reaction mechanism of Sb in copper smelting process. The difference of multi-phase distribution of Sb in four typical copper smelting processes was analyzed. A multi-phase equilibrium model of the oxygen-enriched bottom-blow copper smelting process was developed. The impacts of Cu, S, and Sb concentrations in raw materials on Sb distribution in multiphases were researched. This model was also used to investigate the effect of process factors such as copper matte grade, oxygen-enriched concentration, smelting temperature, and oxygen/ore ratio(ratio of oxygen flow rate under standard conditions to concentrate charge rate) on Sb distribution behavior. The results showed that calculation data were in good agreement with the actual production results and literature data. Increasing the Cu content and decreasing the S and Sb contents in the concentrate, increasing the copper matte grade, oxygen/enriched concentration, and oxygen-ore ratio, and at the same time appropriately reducing the smelting temperature are conducive to the targeted enrichment of Sb into the slag. Modeling results can provide theoretical guidance for the clean and efficient treatment of complex resources and the comprehensive recycling of associated elements.

研究铜冶炼过程Sb的反应机理,分析Sb在4种典型铜冶炼工艺中多相分配差异。建立富氧底吹铜冶炼工艺的多相平衡模型,研究原料中Cu、S和Sb含量对Sb多相分配比的影响。同时,应用该模型研究铜锍品位、富氧浓度、熔炼温度和氧矿比(标准状态下氧气流量与精矿加料速率之比)等工艺参数对Sb分配行为的影响。结果 表明,计算数据与实际生产结果和文献数据吻合良好。提高精矿中Cu含量、降低S和Sb含量,提高铜锍品位、富氧浓度和氧矿比,同时适当降低冶炼温度,有利于Sb向炉渣中定向富集。模拟结果可为复杂资源清洁高效处理及伴生元素综合回收提供理论指导。