广东省斗门县天然石英砂是一种铸钢砂,近年来逐渐受到铸造行业的重视。斗门砂颜色有淡黄的,有白的,比较纯净,含泥量小于1％。其颗粒形状以多角形为主,但棱角均磨成较圆滑的钝角,其次是椭圆形。从电子扫描的照片可看出,斗门砂颗粒表面比较光滑,其粒形系数E=1.45。 Doumen County, Guangdong Province natural quartz sand is a cast steel sand, casting industry in recent years by the gradual attention. Doumen sand color is light yellow, white, more pure, clay content less than 1%. The particle shape of the main polygons, but edges and corners are rounded to a more obtuse, followed by an oval. As can be seen from the electronic scanning photos, Doumen sand particle surface is relatively smooth, the particle size coefficient E = 1.45.