冯博, 钟春晖, 张良柱, 彭金秀, 郭宇涛, 王涛, 宁湘菡, 汪惠惠. 高锰酸钾强化海藻酸钠抑制闪锌矿浮选的作用及机理[J]. 工程科学学报, 2021, 43(5): 612-618. DOI: 10.13374/j.issn2095-9389.2020.03.16.002
引用本文: 冯博, 钟春晖, 张良柱, 彭金秀, 郭宇涛, 王涛, 宁湘菡, 汪惠惠. 高锰酸钾强化海藻酸钠抑制闪锌矿浮选的作用及机理[J]. 工程科学学报, 2021, 43(5): 612-618. DOI: 10.13374/j.issn2095-9389.2020.03.16.002
FENG Bo, ZHONG Chun-hui, ZHANG Liang-zhu, PENG Jin-xiu, GUO Yu-tao, WANG Tao, NING Xiang-han, WANG Hui-hui. Effect and mechanism of potassium-permanganate strengthening and sodium-alginate depression of sphalerite flotation[J]. Chinese Journal of Engineering, 2021, 43(5): 612-618. DOI: 10.13374/j.issn2095-9389.2020.03.16.002
Citation: FENG Bo, ZHONG Chun-hui, ZHANG Liang-zhu, PENG Jin-xiu, GUO Yu-tao, WANG Tao, NING Xiang-han, WANG Hui-hui. Effect and mechanism of potassium-permanganate strengthening and sodium-alginate depression of sphalerite flotation[J]. Chinese Journal of Engineering, 2021, 43(5): 612-618. DOI: 10.13374/j.issn2095-9389.2020.03.16.002

高锰酸钾强化海藻酸钠抑制闪锌矿浮选的作用及机理

Effect and mechanism of potassium-permanganate strengthening and sodium-alginate depression of sphalerite flotation

  • 摘要: 通过浮选试验、X射线光电子能谱(XPS)分析和吸附量测试分析,研究了高锰酸钾和海藻酸钠对黄铜矿、方铅矿和闪锌矿三种硫化矿物浮选的影响,考察了高锰酸钾强化海藻酸钠抑制闪锌矿浮选的作用机理。浮选试验结果表明,单独使用高锰酸钾或海藻酸钠均无法实现对闪锌矿的选择性抑制。同时添加适量高锰酸钾和海藻酸钠对闪锌矿具有选择性的协同抑制作用,而对黄铜矿和方铅矿浮选的影响较小。XPS分析结果表明,海藻酸钠与闪锌矿表面氧化产生的氧化锌、氢氧化锌或硫酸锌等氧化物发生化学吸附,而不与未氧化的闪锌矿表面发生吸附。吸附量测试结果表明,高锰酸钾对闪锌矿的预先氧化作用显著增加了海藻酸钠在闪锌矿表面的吸附量,因此高锰酸钾可以强化海藻酸钠对闪锌矿的抑制作用。

     

    Abstract: Zinc is an important raw material and nonferrous metal that has an extremely important role in the development of national economies. For this reason, countries around the world continue to strengthen their research efforts on the development and utilization of zinc resources. Sphalerite is an important source of zinc metal, which often coexists with chalcopyrite, galena, and pyrite in nature. The flotation separation of complex polymetallic sulfide ore is a difficult problem in the field of mineral processing engineering. To achieve the flotation separation of chalcopyrite, galena, and other minerals from sphalerite, depressants are needed. Due to the difficulty of activation after the depression of galena and other sulfide ores, a zinc depression and lead floatation process is usually used. The choice of the sphalerite depressant is critical when separating zinc and other sulfides. The traditional sphalerite depressants are generally inorganic. Although these depressants significantly improve the hydrophilicity of the sphalerite surface and strongly depress the sphalerite, they have a certain inhibitory effect on other sulfide ores while depressing the sphalerite. In addition, these agents are difficult to degrade and have a negative impact on the environment. To achieve high-efficiency flotation separation of sphalerite and sulfide minerals and improve the quality of the concentrate products, the development of new inhibitors is becoming increasingly important. Thence, the effect of the oxidizer potassium permanganate and organic depressant sodium alginate on the flotation of three kinds of sulfide minerals are studied, including chalcopytite, galena, and sphalerite. The investigations involved flotation tests, X-ray photoelectron spectroscopy (XPS) analysis, adsorption behavior analysis, with an additional focus on the mechanism of potassium permanganate strengthening, and sodium alginate depression of sphalerite flotation. The flotation results show that adding either an oxidizer or sodium alginate alone does not enable the selective depression of sphalerite. However, adding a certain amount of oxidizer and sodium alginate together can realize the selective coordinated depression of sphalerite, with little effect on the flotation of chalcopytite and galena. The XPS analysis results show that sodium alginate is chemically adsorbed on the sphalerite surface with oxidation products such as zinc oxide, zinc hydroxide, or zinc sulfate, but is not adsorbed on an unoxidized sphalerite surface. The adsorption test results show that the preoxidation of potassium permanganate on sphalerite significantly increases the adsorption capacity of sodium alginate on the sphalerite surface. Therefore, potassium permanganate can strengthen the sodium alginate depression of sphalerite flotation.

     

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