东川难选氧化铜矿石的加压氨浸工艺已进展到中间工厂的试验,但在蒸馏铜氨液过程中,由于析出的氧化铜微粒粘结设备表面,堵塞通道而使蒸馏不能连续进行。为此,设有机械刮疤的同心圆栅板蒸馏塔,运行周期最长达40小时,结疤率35％,金属直收率仅60％左右。国内外对防止氧化钢结疤的成 The pressurized ammonia leaching process of Dongchuan refractory copper oxide ore has been progressing to the pilot plant test. However, in the process of distilling the copper ammonia solution, the precipitated copper oxide particles stick to the surface of the equipment to block the passage so that the distillation can not be continuously performed . For this reason, a concentric grid plate distillation column equipped with mechanical scraping scars operates up to 40 hours with a 35% scarring rate and a straight metal recovery of only about 60%. At home and abroad to prevent the oxidation of steel scarring into