With the depletion of mineral resources and increasing environmental protection requirements, researching and developing efficient and environmentally friendly flotation agents is crucial for the comprehensive utilization of mineral resources. Low-grade limestone deposits with high impurities pose a challenge for efficient processing and direct industrial applications. This study explores a novel and sustainable approach to address this challenge by evaluating the prospective use of a fatty-acid-rich oilseed residue as a bio-collector (referred to as collector ) to recover carbonates from a low-grade limestone, characterized by high acid insolubles content and its influence on the kinetics of the flotation process. The bio-collector () outperformed the conventional collector sodium oleate (referred to as ) by significantly increasing the recovery of total carbonates (TC) while simultaneously reducing acid insolubles (AI). A low-grade limestone feed containing 78.40 % TC and 20.90 % AI was upgraded through both mechanical and column flotation techniques. Mechanical flotation yielded a product with 92.9 % TC, 93.48 % TC recovery, 4.0 % AI, and 77.58 % yield at dosage of 0.87 kg/t. Column flotation, at the same dosage, yielded a product with slightly higher TC content (94.20 %), lower TC recovery (91.02 %), similar AI content (4.07 %), and slightly lower yield (74.68 %). The kinetics of the flotation process indicated that the limestone sample exhibited fast-floating behaviour, attributed to the enhanced selectivity of the SSFA collector. The bio-collector stands out as a promising and sustainable alternative to conventional collectors for large-scale low-grade limestone flotation due to its remarkable ability to selectively recover total carbonates while minimizing acid insolubles.

中文翻译：

---

富脂肪酸油籽渣作为绿色捕收剂低品位石灰石浮选性能及动力学研究


随着矿产资源的日益枯竭和环保要求的日益提高，研发高效、环保的浮选剂对于矿产资源的综合利用至关重要。含有高杂质的低品位石灰石矿床对高效加工和直接工业应用提出了挑战。本研究通过评估富含脂肪酸的油籽残渣作为生物捕收剂（称为捕收剂）从低品位石灰石中回收碳酸盐的前景，探索了一种新颖且可持续的方法来应对这一挑战，其特点是高品位石灰石。酸不溶物含量及其对浮选过程动力学的影响。生物捕收剂（）显着提高了总碳酸盐（TC）的回收率，同时减少了酸不溶物（AI），其性能优于传统捕收剂油酸钠（简称为）。通过机械和柱浮选技术对含有 78.40% TC 和 20.90% AI 的低品位石灰石进料进行升级。机械浮选所得产品的 TC 为 92.9%，TC 回收率为 93.48%，AI 为 4.0%，在剂量为 0.87 kg/t 时，收率为 77.58%。在相同投加量下，柱浮选得到的产品TC含量略高（94.20%），TC回收率较低（91.02%），AI含量相似（4.07%），收率略低（74.68%）。浮选过程的动力学表明，石灰石样品表现出快速浮选行为，这归因于 SSFA 捕收剂选择性的增强。 生物捕收剂因其选择性回收总碳酸盐同时最大程度地减少酸不溶物的卓越能力而成为大规模低品位石灰石浮选传统捕收剂的有前途且可持续的替代品。