In the flotation process, there is galvanic corrosion between sulfide mineral particles, which increases the difficulty of separation between minerals. Therefore, the selection of suitable reagents to weaken this corrosion is of great significance. In this article, macromolecular organic reagent sodium lignosulfonate (SLC) was used to weaken the galvanic corrosion between galena and pyrite. Meanwhile, the effect of SLC on the mineral flotation behavior was studied, and the mechanism of SLC was further studied through ion dissolution tests, contact angle tests, infrared spectrum tests, and density functional theory (DFT) calculation. The adsorption of SLC on the mineral electrode increased the charge transfer resistance on the surface of the mineral electrode and hindered the resistance transfer; therefore, it could weaken the galvanic corrosion between galena and pyrite. SLC could selectively depress pyrite at low alkalinity. CaOH⁺ promoted the adsorption of SLC on the pyrite surface. When the pH of the slurry was adjusted by lime, SLC was more easily adsorbed on the pyrite surface, which hindered the adsorption of the collector on the surface of pyrite.

中文翻译：

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木质素磺酸钠存在下方铅矿和黄铁矿的电偶相互作用及其对浮选的影响


在浮选过程中，硫化物矿物颗粒之间存在电偶腐蚀，这增加了矿物间分离的难度。因此，选择合适的试剂来削弱这种腐蚀具有重要意义。本文采用大分子有机试剂木质素磺酸钠 （SLC） 来削弱方铅矿和黄铁矿之间的电偶腐蚀。同时，研究了 SLC 对矿物浮选行为的影响，并通过离子溶出测试、接触角测试、红外光谱测试和密度泛函理论 （DFT） 计算进一步研究了 SLC 的机理。SLC 在矿物电极上的吸附增加了矿物电极表面的电荷转移电阻，阻碍了电阻转移;因此，它可以削弱方铅矿和黄铁矿之间的电偶腐蚀。SLC 可以在低碱度下选择性地抑制黄铁矿。CaOH⁺ 促进了 SLC 在黄铁矿表面的吸附。当石灰调节浆料的 pH 值时，SLC 更容易吸附在黄铁矿表面，阻碍了捕收剂对黄铁矿表面的吸附。