富氧侧吹熔炼+多枪顶吹连续吹炼炼铜工艺炉渣元素分布及其矿相特征

Element distribution and phase characteristics of copper slags from oxygen-rich side-blowing smelting+multi-lances top converting process for copper smelting

"富氧侧吹熔炼+多枪顶吹连续吹炼+火法阳极精炼"热态三连炉连续炼铜工艺属于目前世界上先进的铜冶炼技术,为了减少渣中有价金属损失,本文选择富氧侧吹熔炼渣和多枪顶吹连续吹炼渣作为研究对象,研究渣中铜和铁等元素在不同矿相中的分布情况,得到如下结论:熔炼渣和吹炼渣渣含铜分别为1%~1.7%和12%~15%;熔炼渣物相主要由铁橄榄石、磁铁矿、玻璃相以及夹杂的铜锍组成,熔炼渣选择高铁硅比渣型,配入一定比例的煤粉,可降低炉渣黏度;吹炼渣物相主要由铁酸钙、磁铁矿和金属铜相组成,吹炼渣选择钙渣,控制渣中SiO_(2)含量在3%以下;影响渣含铜的因素主要有渣型、炉温、磁性铁含量、渣层以及铜锍/粗铜层厚度等。

Continuous Cu smelting technology comprising oxygen-rich side-blowing smelting + multi-lances top converting process + pyrometallurgical anode refining” is the advanced copper smelting technology in the world.In order to reduce the loss of valuable metals in slag,oxygen-rich side blowing slag and multi-lances top converting slag are selected as objects to study the distribution of copper and iron elements in slag in different mineral phases,and the following conclusions are obtained:the copper content in smelting slag and converting slag is 1%-1.7% and 12%-15%,respectively;smelting slag is mainly composed of fayalite,magnetite,glass phase and Cu matte.The slag with high Fe-Si ratio is selected for smelting slag,and a certain proportion addition of pulverized coal can reduce the slag viscosity.The converting slag is mainly composed of calcium ferrite,magnetite and metal Cu phase.Calcium slag is selected for converting slag,and the content of SiO_(2) shall be controlled below 3%.The main factors affecting Cu content in slag are slag type,furnace temperature,magnetic iron content,slag layer and matte/blister copper layer thickness.