Investigation on the Copper Content of Matte Smelting Slag in Peirce-Smith Converter

The copper contents and its existing forms in the slags during the slag-making stage of Peirce-Smith converters in Guixi Smelter, Jiangxi Province, China have been investigated. The investigation was based on plant trials with the corresponding thermodynamic calculations and kinetic considerations. From the plant data, the total copper content in the slags was in the range of 2% to 8% (mass fraction). The mechanical entrainment of matte drops has been found to be the main cause of the copper loss. The suspension index, defined as the ratio of the mass fraction of copper in suspended matte drops in the slag to that in bulk of the matte phase, has been adopted to quantify the matte entrainment. The values of this parameter estimated in this work have been found mainly within a range of 2.5%-8.0%. The Fe3O4 content in the slag has been estimated to be the most important factor, among others, influencing the separation of slag with matte and, consequently, the copper loss from the slag.

铜熔渣对不同型号镁铬砖的侵蚀特性研究

结合扫描电子显微镜-能谱仪(SEM-EDS)、X射线显微分析仪、X射线光电子能谱(XPS)及Factsage热力学模拟计算,考察了铜熔渣碱度对镁铬砖的侵蚀影响。结果显示:铜熔渣熔炼过程中会渗透进炉砖小孔,与三氧化二铬反应生成六价铬酸盐侵蚀炉砖;镁铬砖侵蚀速率随铜熔渣碱度的增加而降低;镁铬砖含铬增加及配入添加剂A可降低铜渣对镁铬砖侵蚀。

FeO-CaO-SiO_2熔渣中金属铜滴的电毛细迁移

在外加电场作用下,悬浮在液态冶金渣中的金属或硫化物液滴会受到外加电场的影响向某一极迁移,利用这一现象可以实现金属和渣相的分离,提高渣中有价金属的回收率。通过在高温FeO-CaO-SiO_2熔渣上施加外电场的方法,研究了金属铜滴在该渣系中电毛细迁移的方向以及影响金属铜滴迁移的因素。结果表明:在该渣系中,金属铜滴的电毛细作用使铜滴始终向阴极移动,并聚集沉降在坩埚底部,金属铜的回收率可达53.4%～55.67%;外加电压和渣中铜含量是影响铜滴电毛细迁移的主要因素,随着二者的升高,铜的回收率也随之提高。

铜渣熔融氧化提铁的试验研究

某铜厂炼铜副产品铜渣中铁的含量高于40%,铁在铜渣中主要以铁橄榄石(2FeO·SiO_2)和Fe_3O_4的形式存在,很难直接利用。本文进行了高温熔融氧化铜渣富集提取铁的研究,先将铁橄榄石中的铁组分转化为Fe_3O_4,再通过磁选工艺回收得到铁精矿。所得的铁精矿品位在61%以上,能够满足高炉炼铁原料的要求。

熔融铜渣回收铜及铜铁合金工艺研究

本文根据某炼铜熔融炉渣的矿物特性和选矿工艺特点,提出了一种"两步法"新工艺分别回收铜和铜铁合金,即低温阶段回收铜,高温阶段回收铜铁合金。该工艺对铜和铜铁合金提取比较充分,回收率均在90%以上。回收铜的品位可达99%,可直接送去火法精炼;产出的铜铁合金有害杂质少,可作为耐候钢的理想原料,其价值比纯铁高。此工艺用粉状或粒状非焦煤代替焦炭作还原剂,不用烧结,可以充分利用铜厂现有的设备,节省投资成本。该工艺简单易行,操作方便,有效实现了铜渣的资源化利用,具有良好的经济、社会和环境效益,是一种应用前景广阔的铜渣再利用工艺。