铜阳极泥加压酸浸预处理脱铜富集贵金属（英文）

Removal of Copper and Enrichment of Precious Metals by Pressure Leaching Pretreatment of Copper Anode Slime in Sulfuric Acid Medium

铜阳极泥是铜电解精炼中的一种副产品,是回收贵金属的重要原料。以空气代替氧气为加压气体,系统研究了铜阳极泥加压酸浸预处理工艺。研究的影响因素包括硫酸浓度、空气分压、浸出温度、浸出时间和液固比等。结果表明,在最优工艺条件下,铜的浸出率高达98%;碲、硒、银的浸出率分别为49%、13%、1%。试验数据表明:铜阳极泥经过加压酸浸预处理,几乎所有的铜和部分的碲,能有效的从贵金属中分离出来,使贵金属得以富集。机理研究表明:充分利用阳极泥中水溶性铜离子的自催化氧化作用,能有效提高铜的溶解速度。

The copper anode slime is a by-product of copper electrolytic refining. It is an important raw material for the recovery of precious metals. With air rather than oxygen as the pressurized gas, pressure leaching pretreatment of copper anode slime in sulfuric acid medium is studied systematically. Parameters studied included： concentration of sulfuric acid, partial pressure of air, leaching temperature, leaching time and liquor to solid ratio. The experimental results obtained showed that under optimal leaching conditions, the extraction percentage of copper is up to 98% and the dissolution of tellurium, selenium and silver are 49%, 13% and 1%, respectively. These values indicated that the pretreatment could be very effective for the selective separation of almost all of the copper and part of tellurium from precious metals, thus the precious metals can be enriched from the residue. The investigation of mechanism showed that the autocatalytic effect of variable valence copper ions in the raw copper anode slime can effectively accelerate the rate of copper dissolution.