Abstract

The results of study aimed at extraction of tellurium from its compound with copper in the form of oxides by the pyrometallurgical method are presented in the paper. Technical copper telluride of Kazakhmys Corporation LLP containing crystalline phases (%) 36.5 Cu₇Te₄, 28.5 Cu₅Te₃, 12.9 Cu₂Te, 16.2 Cu_2.5SO₄(OH)₃·2H₂O, and 6.0 Cu₃(SO₄)(OH)₄ was used as an object of research. As a result of the physical and chemical research and technological experiments, the fundamental possibility of processing technical copper telluride by oxidative distillation roasting with the extraction of tellurium into a separate product has been shown. Air oxygen was used as an oxidant. It has been established that a pressure decrease in the range of 80–0.67 kPa at the same temperature entails an increase in the degree of tellurium extraction. However, from a technological point of view, the value of the degree of tellurium extraction (93.0–98.0%) at all pressures (within 1 h) is achieved at a temperature of 1100°C. Increasing the exposure to 3 h has a minor beneficial effect. Diffractometric studies of cinders from technological experiments showed a decrease in the content of copper oxides in the pressure range of 80–40 kPa and an increase in the content of the Cu₃TeO₆ phase. With a subsequent increase in rarefaction from 40 to 0.67 kPa, there is a noticeable decrease in the amount of cuprite and, as a consequence, a sharp increase in the amount of cuprous oxide. A slowdown in the increase in the amount was noted for copper tellurate at pressures of 40–20 kPa, and a sharp drop in its content was noted at pressures below 13.3 kPa. The derived condensate is a free-flowing mixture of crystalline phases of tellurium dioxide (67.7%) and tellurium oxysulfate (32.3%). This condensate is a middling product for further production of elemental tellurium.

中文翻译：

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从氧化物碲化铜中蒸馏回收碲

摘要

本文介绍了采用火法冶金法从其与铜的氧化物中提取碲的研究结果。Kazakhmys Corporation LLP 的工业碲化铜含有结晶相 (%) 36.5 Cu ₇ Te ₄、28.5 Cu ₅ Te ₃、12.9 Cu ₂ Te、16.2 Cu _2.5 SO ₄ (OH) ₃ ·2H ₂ O 和 6.0 Cu ₃ (SO ₄ )(OH) ₄被用作研究对象。物理化学研究和工艺试验表明，采用氧化蒸馏焙烧工艺将碲提取成单独产品的基本可能性已得到证实。空气氧被用作氧化剂。已经确定，在相同温度下，80-0.67 kPa 范围内的压力降低会导致碲提取程度的增加。然而，从技术角度来看，在所有压力下（1 小时内）的碲提取度值（93.0-98.0%）是在 1100°C 的温度下实现的。将暴露时间增加到 3 小时具有较小的有益效果。₃ TeO ₆相。随着随后稀疏度从 40 kPa 增加到 0.67 kPa，赤铜矿的量显着减少，因此氧化亚铜的量急剧增加。在 40-20 kPa 的压力下碲酸铜的含量增加放缓，在低于 13.3 kPa 的压力下其含量急剧下降。衍生的冷凝物是二氧化碲 (67.7%) 和硫酸氧碲 (32.3%) 结晶相的自由流动混合物。该冷凝物是用于进一步生产元素碲的中等产品。