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德意志民主共和国吉里門机械制造厂試驗埸試制成功了輕便的螺旋选矿机(如图),用以从海濱矿砂中选出金紅石、锆英石、柘榴石、钛铁矿和与它們伴生的磁铁矿等重矿物。机器的工作部分为厚为1.5公厘薄鋼板压成的螺旋,由四个直徑为500公厘,螺距为150公厘的螺圈構成。螺旋槽断面为拋物線形。欲选的矿砂給入承受漏斗中,在其上部內襯給入矿砂处,設有强烈的噴水裝置。漏斗底部呈水力旋流器形式。水沿切線方向进入圓錐体內壁;过
Trial of Geelong Machinery Manufacturing Plant in the Democratic Republic of the Congo 埸 A portable screw concentrator (pictured) was successfully manufactured to select rutile, zircon, garnet, ilmenite and their accompanying magnets from seashore ores Iron ore and other heavy minerals. The working part of the machine is a spiral formed of a thin steel sheet 1.5 mm thick, consisting of four spirals with a diameter of 500 mm and a pitch of 150 mm. Spiral groove section parabolic shape. To choose the ore into the bear funnel, lined in its upper part into the ore, with a strong sprinkler. The bottom of the hopper is in the form of a hydrocyclone. Water along the tangential direction into the cone wall; too