ABSTRACT

Flash furnace dusts generated in copper pyrometallurgy are habitually recirculated to the furnace for copper recovery and as a cold burden material. However, it is necessary bled the dusts in order to reduce the amount of impurities to be recycled to the furnace. The most important processes for the treatment of Flash furnace dusts applied at the industrial scale are hydrometallurgical and mainly involve sulfuric acid. The objective of this work was to study the leaching of Flash furnace dusts generated in the Huelva, Spain, plant of Atlantic Copper using sulfuric acid. The work compares a leaching process developed in two steps, (first step with water, followed by leaching with sulfuric acid) to obtain a more selective leaching, or in a single step also with sulfuric acid, which decreases the operations number. A weak acid bleed (wab), from the same plant, was used as a source of sulfuric acid. After leaching, the concentration of sulfates and the acidity were reduced by gypsum precipitation. The liquids generated in this way are suitable for subsequent treatments of arsenic-iron precipitation and copper recovery by electrolysis.

摘要

在铜火法冶金中产生的闪速炉粉尘习惯性地再循环到炉中以回收铜并作为冷料。然而，为了减少再循环到熔炉中的杂质量，必须排出粉尘。工业规模应用的闪蒸炉粉尘处理最重要的工艺是湿法冶金，主要涉及硫酸。这项工作的目的是研究使用硫酸浸出西班牙韦尔瓦大西洋铜厂产生的闪蒸炉粉尘。这项工作比较了分两步开发的浸出工艺，（第一步用水，然后用硫酸浸出）以获得更具选择性的浸出，或在一个步骤中也用硫酸浸出，这减少了操作次数。弱酸渗出液（来自同一工厂的wab ) 被用作硫酸的来源。浸出后，通过石膏沉淀降低硫酸盐浓度和酸度。以这种方式产生的液体适用于砷铁沉淀和电解回收铜的后续处理。