The effective recovery and utilization of elemental sulfur in the direct leach residue (DLR) from zinc oxygen pressure leaching poses a significant challenge. This study analyzes the distribution characteristics of sulfur in DLR and determines its solubility in -decane at various temperatures. Results indicate a gradual increase in sulfur solubility with temperature, reaching a maximum of 6.84 g/100 mL at 150 °C Utilizing the Apelblat model, a fitting equation of ln = 88.3–7155.9/ − 12.0ln is derived. Under conditions of 130 °C, a liquid–solid ratio of 8:1, a reaction time of 3 min, and a stirring speed of 300 rpm, 99.2% of sulfur in the residue can be dissolved in -decane. Additionally, this separation process naturally enriches other valuable elements in the residue. The cooling rate significantly influences sulfur purity, with elemental sulfur forming high-quality crystals exhibiting a positive octahedral rhombic morphology at a cooling rate of 0.018 °C/s. Finally, the dissolution mechanism of sulfur in -decane involves sulfur complexation, and the reliability of the sulfur solubility model is verified.

中文翻译：

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正癸烷溶解重结晶法从锌氧压浸直接浸出渣中分离回收硫


锌氧加压浸出直接浸出渣（DLR）中元素硫的有效回收和利用提出了重大挑战。本研究分析了硫在 DLR 中的分布特征，并测定了不同温度下其在正癸烷中的溶解度。结果表明，硫的溶解度随着温度的升高而逐渐增加，在 150 °C 时达到最大值 6.84 g/100 mL。利用 Apelblat 模型，推导出拟合方程 ln = 88.3–7155.9/−12.0ln。在130℃、液固比8:1、反应时间3min、搅拌速度300rpm的条件下，残渣中99.2%的硫可以溶解在正癸烷中。此外，这种分离过程自然会富集残渣中的其他有价值的元素。冷却速率显着影响硫纯度，在 0.018 °C/s 的冷却速率下，元素硫会形成呈现正八面体菱形形态的高质量晶体。最后，硫在正癸烷中的溶解机理涉及硫络合，验证了硫溶解度模型的可靠性。