Starch was modified by introducing amino radicals to solve the problem of poor selectivity during flotation. Changes in the flocculation and depression properties of starch after introducing amino radicals were compared in carbonate-containing iron ore flotation. Differences in adsorption between corn starch and modified starch were determined through zeta potential measurements, X-ray photoelectron spectroscopy (XPS) analyses, and molecular simulations. The flocculating effects of corn starch and modified starch were explored by the particle dynamics analysis and an in situ scanning electron microscopy (SEM) method. Amino radical can enhance the adsorption of modified starch on quartz via enhanced electrostatic forces. Both corn starch and modified starch exhibit excellent flocculating effects on fine siderite. However, siderite flocs formed with modified starch tend to attach to the quartz. Modified starch is a promising regulator for improving the grade by scarifying recovery in the flotation of refractory carbonate-containing iron ore.

通过引入氨基对淀粉进行改性，解决了浮选过程中选择性差的问题。比较了含碳酸盐铁矿浮选中引入氨基后淀粉絮凝和抑制性能的变化。玉米淀粉和改性淀粉之间的吸附差异是通过 zeta 电位测量、X 射线光电子能谱 (XPS) 分析和分子模拟来确定的。通过颗粒动力学分析和原位扫描电子显微镜（SEM）方法研究了玉米淀粉和变性淀粉的絮凝效果。氨基自由基可以通过增强的静电力增强改性淀粉在石英上的吸附。玉米淀粉和变性淀粉对细菱铁矿均表现出优异的絮凝效果。然而，用改性淀粉形成的菱铁矿絮状物往往附着在石英上。改性淀粉是一种很有前景的调节剂，通过在难选的含碳酸盐铁矿石的浮选中松散回收来提高品位。