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Wenbiao Liu, Wenxuan Huang, Feng Rao, Zhanglei Zhu, Yongming Zheng, and Shuming Wen, Utilization of DTAB as a collector for the reverse flotation separation of quartz from fluorapatite, Int. J. Miner. Metall. Mater., 29(2022), No. 3, pp. 446-454. https://doi.org/10.1007/s12613-021-2321-3
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饶峰 E-mail: fengrao@fzu.edu.cn
朱张磊 E-mail: zhu3748@gmail.com
浮选脱硅是获得高品位氟磷灰石必不可少的步骤。在这项工作中，十二烷基三甲基溴化铵 (DTAB) 被推荐作为一种反浮选分离氟磷灰石和石英的有效捕收剂。借助浮选试验比较了DTAB和传统捕收剂十二胺盐酸盐 (DAC)对石英的捕收性能及氟磷灰石的选择性能的差异；通过接触角测定、zeta 电位检测和吸附密度测量分析了DTAB和DAC在矿物表面的吸附行为差别。结果表明，与 DAC 相比，DTAB 对石英具有相同的捕收性能，并且对氟磷灰石具有更好的选择性能（或更差的捕收性能），能够实现两种矿物的高效分离。表面化学分析结果指出，DTAB在石英表面的吸附能力与DAC一样强，而DTAB在氟磷灰石表面的吸附量远低于DAC，这与浮选结果一致。因而，DTAB 是一种有潜力的捕收剂，可用于氟磷灰石资源的高效纯化和可持续利用。
Reverse flotation desilication is an indispensable step for obtaining high-grade fluorapatite. In this work, dodecyltrimethylammonium bromide (DTAB) is recommended as an efficient collector for the reverse flotation separation of quartz from fluorapatite. Its collectivity for quartz and selectivity for fluorapatite were also compared with figures corresponding to the conventional collector dodecylamine hydrochloride (DAC) via microflotation experiments. The adsorption behaviors of DTAB and DAC on minerals were systematically investigated with surface chemical analyses, such as contact angle determination, zeta potential detection, and adsorption density measurement. The results revealed that compared to DAC, DTAB displayed a similar and strong collectivity for quartz, and it showed a better selectivity (or worse collectivity) for fluorapatite, resulting in a high-efficiency separation of the two minerals. The surface chemical analysis results showed that the adsorption ability of DTAB on the quartz surface was as strong as that of DAC, whereas the adsorption amount of DTAB on the fluorapatite surface was much lower than that of DAC, which is associated with the flotation performance. During the floatation separation of the actual ore, 8wt% fluorapatite with a higher grade can be obtained using DTAB in contrast to DAC. Therefore, DTAB is a promising collector for the high-efficiency purification and sustainable utilization of valuable fluorapatite recourses.
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