Fluorite and barite share similar physicochemical properties, making them challenging to separate efficiently using flotation. To address this problem, sodium oleate (NaOL) was used as a collector to study the separation effect of carboxylated chitosan (CCS) as a depressant for fluorite and barite. Infrared Spectroscopy (FTIR) test, X-ray photoelectron spectroscopy (XPS), Zeta potential test, contact angle test and adsorption test were investigate the selective depression mechanism of CCS. The test results showed that CCS, acting as the depressant, effectively depressed fluorite and separated fluorite and barite. According to mechanistic analysis, CCS developed stable chemisorption by bonding the carboxyl group (–COOH) in its molecule and the calcium sites of fluorite. In contrast, CCS adsorption on barite was a hydrogen bonding interaction, making CCS easily fall off the barite surface. As a result, NaOL can be stably adsorbed on the barite surface, whereas CCS present on the fluorite surface consumes a high number of Ca sites and reduces Ca sites available for NaOL adsorption, resulting in distinct hydrophobicity and floatability differences between fluorite and barite. Consequently, barite and fluorite were successfully separated.

中文翻译：

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以羧化壳聚糖为抑制剂的萤石和重晶石的选择性浮选分离


萤石和重晶石具有相似的物理化学性质，这使得它们难以使用浮选进行有效分离。为了解决这个问题，以油酸钠 （NaOL） 为收集剂，研究羧化壳聚糖 （CCS） 作为萤石和重晶石抑制剂的分离效果。红外光谱 （FTIR） 测试、X 射线光电子能谱 （XPS） 、Zeta 电位测试、接触角测试和吸附测试研究了 CCS 的选择性抑制机制。试验结果表明，CCS 作为抑制剂，有效抑制萤石，分离萤石和重晶石。根据机理分析，CCS 通过键合其分子中的羧基 （-COOH） 和萤石的钙位点而产生稳定的化学吸附。相比之下，重晶石上的 CCS 吸附是氢键相互作用，使 CCS 容易从重晶石表面脱落。因此，NaOL 可以稳定吸附在重晶石表面，而存在于萤石表面的 CCS 消耗大量 Ca 位点，减少可用于 NaOL 吸附的 Ca 位点，导致萤石和重晶石之间产生明显的疏水性和可浮性差异。因此，重晶石和萤石被成功分离。