东北大学学报(自然科学版) ›› 2024, Vol. 45 ›› Issue (1): 93-100.DOI: 10.12068/j.issn.1005-3026.2024.01.012

• 资源与土木工程 • 上一篇    下一篇

酸蚀对白云石可浮性的影响及其作用机理

郭俊1, 印万忠1, 杨斌2, 朱张磊3   

  1. 1.东北大学 资源与土木工程学院,辽宁 沈阳 110819
    2.中国矿业大学 化工学院,江苏 徐州 221116
    3.西安科技大学 化学与化工学院,陕西 西安 710054
  • 收稿日期:2022-08-02 出版日期:2024-01-15 发布日期:2024-04-02
  • 作者简介:郭 俊(1993-),男,内蒙古包头人,东北大学硕士研究生
    印万忠(1970-),男,浙江临安人,东北大学教授,博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(52174239);中央高校基本科研业务费专项资金资助项目(N2101025)

Effect of Acid Etching on the Floatability of Dolomite and Its Mechanism of Action

Jun GUO1, Wan-zhong YIN1, Bin YANG2, Zhang-lei ZHU3   

  1. 1.School of Resources & Civil Engineering,Northeastern University,Shenyang 110819,China
    2.School of Chemical Engineering,China University of Mining and Technology,Xuzhou 221116,China
    3.School of Chemistry and Chemical Engineering,Xi’an University of Science and Technology,Xi’an 710054,China. Corresponding author: YIN Wan-zhong,E-mail: yinwanzhong@ mail. neu. edu. cn
  • Received:2022-08-02 Online:2024-01-15 Published:2024-04-02

摘要:

在油酸钠体系下,通过浮选试验、浮选动力学拟合、表面粗糙度表征、比表面积分析、XPS分析、吸附性能分析和润湿性分析,研究了酸蚀对白云石可浮性的影响及其作用机理.研究结果表明:酸蚀后,白云石表面粗糙度和比表面积增大,这暴露出更多的活性位点,强化了与油酸钠的吸附,增强了白云石的疏水性,进而改善了白云石的浮选性能.此外,在浮选动力学拟合中,经典一级动力学模型、一级矩阵分布模型、二级动力学模型的R2均高于95%.相比于其他模型,经典一级动力学拟合效果较好.其中在油酸钠质量浓度为60 mg/L时,酸蚀后白云石经典一级动力学k最大值为1.88 min-1,与此同时,酸蚀前白云石经典一级动力学k=1.15 min-1,表明酸蚀可以提高白云石浮选速率.本研究为白云石浮选提供了新的研究方向,具有一定的理论和现实意义.

关键词: 白云石, 粗糙度, 酸蚀, 可浮性, 浮选动力学

Abstract:

The effect of acid etching on the floatability of dolomite and its mechanism of action were investigated by flotation tests, flotation kinetic fitting, surface roughness characterization, specific surface area analysis, XPS analysis, adsorption performance analysis and wettability analysis under sodium oleate system. The research results showed that acid etching increased the surface roughness and specific surface area of dolomite, exposing more active sites, strengthened the adsorption sodium oleate, enhanced the hydrophobic of dolomite, and thus improved the performance of dolomite. Moreover, regarding flotation kinetic fitting, the classical first-order model, first-order model with rectangular distribution of floatability, and the second-order kinetic model all displayed the R2 values higher than 95%. Compare with other models, the classical first-order model exhibited the best fit. At a sodium oleate mass concentration of 60 mg/L, the k value of classical first-order for dolomite reached a maximum value of 1.88 min-1. However, in this case, before acid etching, the k value of classical first-order model for dolomite was only 1.15 min-1. These results further confirmed that acid etching could improve the flotation rate of dolomite. In summary, this study can provide a new research perspective for dolomite flotation, with a certain theoretical and practical significance.

Key words: dolomite, roughness, acid etching, floatability, flotation kinetics

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