Abstract

A complex copper dross containing Bi, Pb, Cu, As and Sb was processed in a 3.6 m² industrial-scale oxygen-rich side-blown bath smelting furnace (OSBF). The products were collected and analyzed by chemical and mineralogical methods. Industrial statistical data showed that recoveries of Cu, Pb, Bi and Sb reached 87%, 96%, 97% and 60%, respectively. Slag composition indicated that the process can be divided into 2 steps, i.e., oxidative smelting and reductive smelting, due to the use of different oxygen-rich gas flow rate and enrichment. The effect of oxygen partial pressure (P_O2) on the element partitioning was simulated by Factsage. The results indicated that increase of P_O2 between 10^–5 atm and 10^–7 atm would significantly increase the partitioning of Cu, Pb, As and Sb to the slag; while element partitioning became almost independent of P_O2 between 10^–7.5 atm to 10^–9.5 atm. Phase analysis for the slag indicated that the bath in the furnace was a “FeO”–CaO–SiO₂–Al₂O₃–ZnO slag coexisting with solid spinels.

Graphical Abstract

中文翻译：

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富氧侧吹浴熔炼铜渣的工艺研究

摘要

在3.6 m ²工业规模的富氧侧吹浴熔炼炉（OSBF）中处理了包含Bi，Pb，Cu，As和Sb的复杂铜渣。收集产物并通过化学和矿物学方法进行分析。工业统计数据表明，Cu，Pb，Bi和Sb的回收率分别达到87％，96％，97％和60％。炉渣组成表明，由于使用了不同的富氧气体流量和富集工艺，该过程可分为两个步骤，即氧化冶炼和还原冶炼。通过Factsage模拟了氧分压（P _O2）对元素分配的影响。结果表明，P _O2在10 ^–5  atm和10 ^–7之间增加 atm将显着增加Cu，Pb，As和Sb在炉渣中的分配；而元素分配几乎独立于P _O2在10 ^–7.5  atm至10 ^–9.5  atm之间。炉渣的相分析表明，熔炉中的熔池是与固态尖晶石共存的“ FeO” -CaO-SiO ₂ -Al ₂ O ₃ -ZnO炉渣。

图形概要