Vacuum refining of molten copper matte.

熔融冰铜的真空精炼。

• 批准号: 60550465
• 负责人: AZAKAMI Takeshi
• 金额: $ 1.34万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1986
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60550465/
• 关键词: copper smelting; matte; vacuum refining; impurity removal; arsenic; antimony; ビスマス; 鉛

The levels of several impurities such as arsenic and antimony in copper concentrates have been increasing in recent years. Elimination of these impurities is important during the copper smelting process, because the Va elements present serious problems for electrical and mechanical properties of copper. In this study, a vacuum refining was applied for <Cu_2> S・FeS copper mattes which contain 1 mass percent impurities of arsenic, antimony, bismuth and lead at 1150゜C as one of the elimination techniques of an impurity from copper matte.By the present study, the following conclusions were obtained;1) The concentrations of the impurities in the matte decrease with decreasing pressure of treatment and increasing processing time, although evaporation of impurity elements from the matte was almost not recognized at an atmospheric pressure of nitrogen.2) Nearly all amount of lead and bismuth were removed from the copper matte at the pressure of 1mmHg.3) The antimony content decreased from 1 mass% to 0.08 in the matte by the vacuum refining after 2 hours at 1mmHg pressure. An arsenic content also decreased to 0.5 mass% in the matte under the same conditon for antimony, its removal being insufficient.4) Lead removal from the low grade copper matte was faster than that from the high grade matte. It seems that the evaporation rate may correlate with sulfur pressures over the mattes, because, in the present condition, lead sulfide was estimated thermodynamically a predominant gas species of lead over the molten matte, and the sulfur pressure equilibrated with the low grade copper matte is higher than the pressure over the high grade matte.

近年来，铜浓缩物中的几种杂质的水平一直在增加。消除这些杂质在铜冶炼过程中很重要，因为VA元素对铜的电气和机械性能带来了严重的问题。在这项研究中，对<cu_2> s的真空炼油铜板含有1个质量质量百分比质量百分比杂质的杂质，矩阵，二氧化碳和铅的质量，作为铜磨砂的杂质的进化技术之一。尽管在氮的大气压力下几乎没有认识到哑光的杂质元素的蒸发。在同一孔子下，哑光的砷含量也降低到0.5质量％，用于锑，其去除不足。4）铅从低级铜哑光中取出的铅比从高级哑光中取出的速度快。看来，经济速率可能与哑光上的硫压力相关，因为在表现条件下，估计硫化铅在热力学上估计是熔融哑光上铅的主要气体物种，并且与高级铜哑光含量相当于高级磨砂的压力高。