基于应由粘土在松散型砂中的分布状态来评价混砂质量的想法,本文提出了一种观测型砂颗粒截面以研究粘土在砂粒表面分布的实验方法.在不同混砂时间时,对砂粒表面粘土膜的厚度、粘土膜的均匀性和型砂中的成膜粘土量进行了测量及计算,获得粘土分布随混砂时间而变化的规律,并与型砂性能的变化相对应. Based on the idea that sand should be evaluated by the distribution of clay in loose sand, a new method for observing the distribution of clay on the surface of sand was proposed in this paper. At different sand mixing times, The thickness of the film, the uniformity of the clay film and the amount of film-forming clay in the sand were measured and calculated, and the regularity of the clay distribution changing with the sand mixing time was obtained, which corresponded with the change of the sand performance.