【摘要】 在超细磨过程中，三乙醇胺（TEA）等有机助磨剂会影响物料的脱水效能，而通过物理改性能够实现助磨剂用量与磨矿效率的协同调控。本文利用超声改性TEA助磨生石膏，探究了超声改性TEA在生石膏超细磨过程中的作用机理，采用傅里叶红外光谱仪、X射线衍射分析等手段对TEA溶液和超细磨产品进行了表征。结果表明：超声改性时间为25 min时，TEA可使超细石膏产品的D₉₀从61.98μm减小至28.02μm,比表面积从417.2 cm²/g增大至1 980.6 cm²/g;超声改性使TEA溶液中醇羟基和自由水的占比分别增加了7.81、23.09百分点，提高了自由水与生石膏表面钙离子的水合作用以及醇羟基在生石膏表面的吸附程度，使生石膏料浆黏度减小了23.66 mPa·s,超细磨产品的（020）等晶面衍射峰强度明显减弱，最终强化了TEA对生石膏的助磨效果。更多还原

【Abstract】 In the process of ultrafine grinding, organic grinding aids such as triethanolamine(TEA) could affect the dewatering efficiency of the material, while physical modification could ensure the optimization of grinding aid dosage and synergistic regulation of grinding efficiency. In this paper, ultrasonic-modified TEA was used to grind gypsum, and the mechanism of ultrasonic-modified TEA in the process of ultra-fine grinding of raw gypsum was explored. The TEA solution and ultra-fine grinding products were characterized by Fourier transform infrared spectroscopy and X-ray diffraction analysis. The results showed that when the ultrasonic modification time was 25 min, TEA could reduce the D90 of the ultra-fine grinding product of gypsum from 61.98 μm to 28.02 μm, and the specific surface area increase from 417.2 cm~2/g to 1 980.6 cm~2/g. Ultrasonic modification increase the proportion of alcohol hydroxyl group and free water in TEA solution by 7.81 and 23.09 percentage points, respectively. The hydration of free water with calcium ions on the surface of gypsum and the adsorption degree of alcohol hydroxyl group on the surface of gypsum are improved. The viscosity of raw gypsum slurry is reduced by 23.66 mPa·s, and the diffraction peak intensity of(020) crystal plane of ultrafine grinding product is obviously weakened, which finally strengthen the grinding effect of TEA on raw gypsum.更多还原