新型调整剂BS001对水镁石和蛇纹石浮选分离的影响

Effect of the New Regulator BS001 on Flotation Separation of Brucite and Serpentine

针对水镁石和蛇纹石性质相近、分离困难的难题,通过以新型药剂BS001为调整剂,在油酸钠体系下实现了两者的浮选分离。并通过接触角测量、Zeta电位分析、红外光谱分析和XPS分析对调整剂BS001的作用机理进行了研究。单矿物浮选试验表明,BS001作为调整剂时的最佳浮选分离试验条件为矿浆pH值为11、BS001用量为200 mg/L、油酸钠用量320 mg/L。在此药剂制度下,人工混合矿浮选精矿品位可达63.63%,精矿中水镁石回收率可达81.98%,可实现水镁石和蛇纹石高效分离。接触角测量表明,在浮选过程中添加调整剂BS001后,对水镁石表面疏水性有一定影响,但是表面疏水性仍较高,脉石矿物蛇纹石表面疏水性可以被显著降低。Zeta电位分析结果表明,在BS001存在下添加油酸钠,油酸钠可以继续吸附在水镁石表面,使水镁石表面电位发生负移;蛇纹石表面电位无明显变化,油酸钠无法继续吸附于蛇纹石表面。结合红外光谱和XPS分析结果可知,调整剂BS001结构上含有大量羧基基团,羧酸基团与水镁石和蛇纹石表面Mg位点发生化学缔合作用,阻碍了捕收剂油酸钠在矿物表面的吸附。在合理的药剂制度下,与BS001作用后的蛇纹石表面无法继续吸附油酸钠,但水镁石表面仍存在Mg位点供油酸钠所吸附。在此基础上可以扩大水镁石和蛇纹石的可浮性差异,实现两者的浮选分离。

In this study,we aimed to address the challenge of similar properties and difficult separation between brucite and serpentine.We successfully achieved flotation separation of these two minerals in the NaOL system by utilizing BS001 as a regulator.To investigate the mechanism of action of BS001,we conducted contact angle measurements,Zeta potential analysis,infrared spectroscopy analysis,and XPS analysis.Micro-flotation indicated that the optimal condition is as follows:the slurry pH value 11,the dosage of BS001200 mg/L,and the dosage of NaOL 320 mg/L.Under this reagent system,the concentrate grade can reach 63.63%,with an 81.98%recovery of brucite in the concentrate,facilitating efficient separation between brucite and serpentine.Contact angle measurements indicated that the addition of BS001 has a certain impact on the hydrophobicity of brucite;however,the surface hydrophobicity remains relatively high.In contrast,the hydrophobicity of serpentine can be significantly reduced.The results of Zeta potential analysis indicated that in the presence of BS001,the NaOL continues to adsorb on the surface of brucite,causing a shift in the surface potential of brucite.There is no significant change in the surface potential of serpentine,indicating that NaOL cannot further adsorb onto the surface of serpentine.Combining the results of infrared spectroscopy analysis and XPS analysis,it can be inferred that the carboxylic acid group on the structure of BS001 forms chemical bonds with Mg sites on the surface of brucite and serpentine,hindering the adsorption of NaOL onto mineral surfaces.Under this optimized reagent system,the surface of serpentine becomes unable to absorb NaOL due to its interaction with BS001;however,there are still available Mg sites on the surface of brucite for NaOL adsorption.Based on these findings,we were able to enhance the difference in floatability between brucite and serpentine,leading to successful flotation separation.