Recycling waste frying oils for the synthesis of flotation reagents presents a promising avenue for sustainable waste management. Moreover, it offers a cost-effective solution for crafting a specialized collector designed to efficiently remove carbonates and enhance phosphate enrichment in froth flotation processes. This study focuses on the synthesis of an anionic collector using the saponification reaction of a frying oil sample, subsequently applied to the flotation of calcite and dolomite. To elucidate the adsorption mechanisms of the frying oil collector (FrOC) and sodium oleate, a reference collector, on fluorapatite, calcite, dolomite, and quartz surfaces, comprehensive experiments were conducted, including zeta potential measurements and Fourier transform infrared spectroscopy. Results revealed diverse adsorption affinities of the molecules towards these minerals. To assess the practical performance of the collector, flotation tests were conducted using a natural phosphate ore mixture, employing a Box-Behnken experimental design. Notably, under optimized conditions (pH 9, 1000 g/t of FrOC, 3.5 min of conditioning, and 6 min of flotation), FrOC exhibited excellent performance, with calcite and dolomite recoveries exceeding 80%, while apatite recovery in the concentrate fraction remained below 10%. This work exemplifies both circular economy practices and the distinctive approach to sustainable mineral processing.

中文翻译：

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提高磷矿加工的可持续性：煎炸油作为替代浮选捕收剂去除碳酸盐的性能


回收废煎炸油用于合成浮选试剂为可持续废物管理提供了一条有前途的途径。此外，它还提供了一种经济高效的解决方案，用于制作专门的捕收剂，旨在有效去除碳酸盐并增强泡沫浮选过程中磷酸盐的富集。本研究的重点是利用煎炸油样品的皂化反应合成阴离子捕收剂，随后应用于方解石和白云石的浮选。为了阐明煎炸油捕收剂 (FrOC) 和参考捕收剂油酸钠在氟磷灰石、方解石、白云石和石英表面上的吸附机制，进行了综合实验，包括 zeta 电位测量和傅里叶变换红外光谱。结果揭示了分子对这些矿物质的不同吸附亲和力。为了评估捕收剂的实际性能，采用 Box-Behnken 实验设计，使用天然磷酸盐矿石混合物进行浮选测试。值得注意的是，在优化条件下（pH 9、1000 g/t FrOC、调节 3.5 分钟、浮选 6 分钟），FrOC 表现出优异的性能，方解石和白云石回收率超过 80%，而精矿馏分中的磷灰石回收率保持不变低于10%。这项工作体现了循环经济实践和可持续矿物加工的独特方法。