Abstract Copper telluride is a sort of solid waste generated from copper anode slime processing, from which the recovery of copper and particularly the high-value element of tellurium always encounter technical difficulties due to the complex physicochemical properties of tellurium. In this study, an efficient and compact process for copper telluride recycling has been developed. Efficient separation of tellurium and copper from copper telluride was achieved through a pressure oxidizing alkaline leaching process under the optimal conditions of 5 mol/L for NaOH concentration, 5:1 for liquid to solid ratio, 150 °C for temperature, 0.7 Mpa for system pressure, and 2 h for reaction time, by which over 95% of tellurium was selectively dissolved in the solution and copper was enriched in the solid phase mainly in the form of copper oxides. Tellurium was subsequently recovered as TeO2 by neutralization of the alkaline leaching solution with sulfuric acid to pH 4.5, delivering a TeO2 precipitation efficiency of over 95%. In general, the masses of tellurium and copper balanced well in both the liquid and solid phases for each step, and the overall recovery efficiencies of Te and Cu reached as high as approximately 91% and 98%, respectively.

中文翻译：

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从铜阳极泥处理中回收碲化铜：实现碲和铜的有效回收

摘要 碲化铜是铜阳极泥加工过程中产生的一种固体废物，由于碲的物化性质复杂，回收铜特别是高价值元素碲一直面临技术难题。在这项研究中，开发了一种高效紧凑的碲化铜回收工艺。在NaOH浓度5 mol/L、液固比5:1、温度150 °C、系统0.7 Mpa的最佳条件下，通过加压氧化碱浸工艺实现碲铜与碲化铜的高效分离压力和反应时间为 2 小时，其中超过 95% 的碲被选择性地溶解在溶液中，铜主要以氧化铜的形式富集在固相中。随后，通过用硫酸将碱性浸出溶液中和至 pH 4.5，以 TeO2 形式回收碲，使 TeO2 沉淀效率超过 95%。一般来说，每一步的液相和固相中碲和铜的质量平衡良好，Te和Cu的整体回收率分别高达约91%和98%。