一、前言几年来,由于现场工作者的努力,在氧化锡矿细粒锡石回收方面取得了很大的成就,作业回收率有了较大的提高。而—37微米部分的回收率仍然较低。在1961年曾研究用自动皮带溜槽回收37～19微米的锡石,取得了一定成绩,但是处理能力尚低(0.4～0.5 I. Introduction In the past few years, thanks to the efforts of field workers, great achievements have been made in the recovery of fine-grained cassiterite from tin oxide. The recovery rate has been greatly improved. The recovery of the -37 micron fraction is still low. In 1961 he studied the use of automatic belt chute recovery of 37-19 m cassiter, and achieved some results, but the processing capacity is still low (0.4 ~ 0.5