为了使旋流器的洗选粒度下限低于公认的0.5毫米,曾作过不少次尝试。但到目前为止,收效甚微。目前这项工作仍在蓬勃开展,而且有了显著的进展。美国至少有三种重介旋流器的洗选粒度下限达0.147毫米,甚至降到零。其中一台旋流器运转时间较长,获得 In order to make the cyclone wash particle size lower than the accepted 0.5 mm, many attempts have been made. But so far, with little success. The current work is still flourishing and there has been notable progress. At least three heavy medium cyclones in the United States have a lower limit of washing particle size of 0.147 millimeters, even down to zero. One of the cyclone operation time is longer, get