Abstract Sb and Te in Te-bearing alkaline skimming slag were extracted into a leach solution using a two-stage sodium sulfide leaching process. In this study, a possible method for selective recovery of Sb and Te from the sodium sulfide leach solution by drop-wise H2O2 addition followed by Na2S–Na2SO3 precipitation was developed. 99% of Sb was precipitated selectively at 50 °C for 100 min with addition of 90 mL H2O2 while Te precipitation was near-zero. Te in the oxidized solution was converted to the form of TeS42− with Na2S, and recovered by Na2SO3 reduction. The results indicated that 95% of Te was precipitated under the optimum conditions: 1.0 of Na2S excess coefficient, 1.75 of Na2SO3 excess coefficient, 50 °C of temperature and 30 min of time. XRD pattern and chemical analysis indicated that the H2O2 oxidation precipitate was NaSb(OH)6 with Sb content of 46.92% and the Na2S–Na2SO3 precipitate was elemental Te with a purity of 98.61%.

中文翻译：

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通过滴加 H2O2 然后 Na2S–Na2SO3 沉淀从含 Te 碱性撇渣渣的硫化钠浸出液中选择性回收 Sb 和 Te

摘要 采用两段硫化钠浸出工艺将含Te碱性撇渣渣中的Sb和Te提取到浸出液中。在这项研究中，开发了一种通过逐滴加入 H2O2 然后 Na2S-Na2SO3 沉淀从硫化钠浸出溶液中选择性回收 Sb 和 Te 的可能方法。99% 的 Sb 在 50 °C 下选择性沉淀 100 分钟，加入 90 mL H2O2，而 Te 沉淀接近于零。氧化溶液中的 Te 用 Na2S 转化为 TeS42− 的形式，并通过 Na2SO3 还原回收。结果表明，在最佳条件下析出95%的Te：Na2S过量系数为1.0，Na2SO3过量系数为1.75，温度50℃，时间30min。