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研究取代度不同的两种羧甲基淀粉(CMSL和CMSH分别表示取代度低和取代度高的羧甲基淀粉)在以十二胺(DDA)为捕收剂的阳离子反浮选中对一水硬铝石的抑制性能。考察了CMS的取代度对其抑制性能及作用方式的影响。单矿物浮选实验表明,在广泛pH值范围内,CMSL对一水硬铝石的抑制能力要好于CMSH。借助吸附量测试、动电位测量和原子力显微镜对CMS在一水硬铝石表面的吸附进行研究。结果表明:相对于CMSL,CMSH分子中具有更多的吸附点,因而在一水硬铝石表面具有较小的吸附量和较薄的吸附层厚度,并使一水硬铝石表面具有较强的电负性。溶液表面张力的测定和捕收剂DDA的吸附实验进一步揭示,CMSL分子的环式吸附构象可以罩盖更多的DDA从而显示优良的抑制性能,而CMSH/DDA体系则表现得更像一种表面活性剂。
Two kinds of carboxymethyl starch with different degrees of substitution (CMSL and CMSH respectively represent carboxymethyl starch with low degree of substitution and high degree of substitution) were studied in cationic reverse flotation with dodecylamine (DDA) as collector Diaspore inhibitory performance. The effect of substitution degree of CMS on its inhibitory performance and mode of action was investigated. Single mineral flotation experiments showed that CMSL had a better ability to inhibit diaspore than CMSH over a wide range of pH values. The adsorption of CMS onto the diaspore surface was investigated by adsorption, potentiodynamic measurement and atomic force microscopy. The results show that CMSH has more adsorption sites on the CMSH molecule, so it has smaller adsorption capacity and thinner adsorption layer thickness on the surface of diaspore, and makes diaspore surface stronger Electronegativity. The determination of the solution surface tension and the adsorption experiment of the collector DDA further revealed that the cyclic adsorption conformation of the CMSL molecule can cover more DDA to show excellent inhibition performance while the CMSH / DDA system behaves more like a surface Active agent.