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Improving flotation separation of apatite from dolomite using PAMS as a novel eco-friendly depressant
Minerals Engineering ( IF 4.8 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.mineng.2020.106492
Bin Yang , Zhanglei Zhu , Haoran Sun , Wanzhong Yin , Jongsu Hong , Shaohang Cao , Yuan Tang , Chen Zhao , Jin Yao

Abstract Froth flotation is widely used as an effective method for separating apatite from dolomite. However, it is of difficulty to realize the efficient separation of apatite and dolomite using the traditional fatty acid collectors without any depressants due to their similar physicochemical properties. In this work, the depression performance of poly (acrylic acid-co-maleic acid) sodium salt (PAMS) acting as a new depressant was evaluated via the flotation experiments, when sodium oleate (NaOl) was employed as the collector. The results from flotation experiments illustrated that PAMS effectively depressed the dolomite flotation whereas it exhibited weak influences on the floatability of apatite. It was also found that the reagent scheme of 14 mg/L PAMS and 100 mg/L NaOl could effectively remove dolomite from apatite at pH 9.00. Moreover, the adsorption mechanism of PAMS onto the two minerals was uncovered through the surface analyses. The analyzed results indicated that the interaction of PAMS with magnesium ions exposed to dolomite played a vital part in the selective adsorption of PAMS onto dolomite. Magnesium, as a major component of dolomite rather than apatite, enhanced the chemisorption of PAMS onto dolomite. Furthermore, the larger pre-adsorption of PAMS onto dolomite than apatite significantly led to the much less adsorption of NaOl on the dolomite surface, thereby reducing the hydrophobicity of dolomite in NaOl system and intensively depressing the dolomite flotation. Therefore, PAMS can be utilized as a potential depressant for removing dolomite from apatite by direct flotation.

中文翻译:

使用PAMS作为新型环保抑制剂改善磷灰石与白云石的浮选分离

摘要 泡沫浮选是一种从白云石中分离磷灰石的有效方法。然而,由于磷灰石和白云石的物理化学性质相似,使用传统的不加任何抑制剂的脂肪酸捕收剂很难实现磷灰石和白云石的高效分离。在这项工作中,当油酸钠(NaOl)用作捕收剂时,通过浮选实验评估了作为新型抑制剂的聚(丙烯酸-共-马来酸)钠盐(PAMS)的抑制性能。浮选实验结果表明,PAMS有效抑制了白云石的浮选,而对磷灰石的可浮性影响较弱。还发现 14 mg/L PAMS 和 100 mg/L NaOl 的试剂方案可以有效地从 pH 9.00 的磷灰石中去除白云石。而且,通过表面分析揭示了 PAMS 在两种矿物上的吸附机制。分析结果表明,PAMS 与暴露于白云石中的镁离子的相互作用在 PAMS 选择性吸附到白云石上起到了至关重要的作用。镁作为白云石的主要成分而不是磷灰石,增强了 PAMS 对白云石的化学吸附。此外,PAMS在白云石上的预吸附量比磷灰石大,明显导致白云石表面对NaOl的吸附量少得多,从而降低了NaOl体系中白云石的疏水性,严重抑制了白云石的浮选。因此,PAMS 可用作直接浮选从磷灰石中去除白云石的潜在抑制剂。分析结果表明,PAMS 与暴露于白云石中的镁离子的相互作用在 PAMS 选择性吸附到白云石上起到了至关重要的作用。镁作为白云石的主要成分而不是磷灰石,增强了 PAMS 对白云石的化学吸附。此外,PAMS在白云石上的预吸附量比磷灰石大,明显导致白云石表面对NaOl的吸附量少得多,从而降低了NaOl体系中白云石的疏水性,严重抑制了白云石的浮选。因此,PAMS 可用作直接浮选从磷灰石中去除白云石的潜在抑制剂。分析结果表明,PAMS 与暴露于白云石中的镁离子的相互作用在 PAMS 选择性吸附到白云石上起到了至关重要的作用。镁作为白云石的主要成分而不是磷灰石,增强了 PAMS 对白云石的化学吸附。此外,PAMS在白云石上的预吸附量比磷灰石大,明显导致白云石表面对NaOl的吸附量少得多,从而降低了NaOl体系中白云石的疏水性,严重抑制了白云石的浮选。因此,PAMS 可用作直接浮选从磷灰石中去除白云石的潜在抑制剂。作为白云石的主要成分而不是磷灰石,增强了 PAMS 对白云石的化学吸附。此外,PAMS在白云石上的预吸附量比磷灰石大,明显导致白云石表面对NaOl的吸附量少得多,从而降低了NaOl体系中白云石的疏水性,严重抑制了白云石的浮选。因此,PAMS 可用作直接浮选从磷灰石中去除白云石的潜在抑制剂。作为白云石的主要成分而不是磷灰石,增强了 PAMS 对白云石的化学吸附。此外,PAMS在白云石上的预吸附量比磷灰石大,明显导致白云石表面对NaOl的吸附量少得多,从而降低了NaOl体系中白云石的疏水性,严重抑制了白云石的浮选。因此,PAMS 可用作直接浮选从磷灰石中去除白云石的潜在抑制剂。
更新日期:2020-09-01
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