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Thermodynamic Study on Production of High Purity Copper

高纯铜生产的热力学研究

基本信息

批准号：
03453061
负责人：
YAMAUCHI Chikabumi
金额：
$ 4.35万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

项目摘要

In order to estimate the distribution ratios of Se between sodium carbonate-based slag and molten copper, the following measurements have been conducted on the thermodynmic properties of the slags containing Se-oxide at 1423 K to1523 K.(1) Electrochemical measurements of activity of NaO_<0.5> in NaO_<0.5>-CO_2-SeO_2 slag under various partial pressues of CO_2 over the composition range of 1 > N (〕SY.gtoreq.〔) 0.667 {N = n_<Na>/(n_<Na>+n_<Se>), n : the number of moles} by using beta"-alumina as a solid electrolyte.(2) Distribution equilibrium measurements of Se between the slag and molten copper, and(3) Solubility measurements of CO_2 in the slags.Finally based on the results, the equilibrium distribution ratio of Se between the slags and molten copper have been estimated as a function of partial pressures of CO_2 and oxygen and the slag composition at the temperatures of 1423 K and 1523 K.Higher distribution ratios are achieved under conditions of higher partial pressure of oxygen and lower partial pressure of CO_2.Experiments were also conducted for the slag of N * 1 in order to evaluate the effect of partial pressure of oxygen on the distribution ratios. The distribution ratio of Se has two different dependences on the oxygen partial pressure. Under the relatively low oxygen partial pressure, the distribution ratio of both elements decreases with increasing oxygen partial pressure while under the relatively high oxygen partial pressure the distribution ratio of Se increases with increasing the oxygen partial pressure. In both areas, higher distribution ratios are achieved under the condition of lower partial pressure of CO_2.

为了估算碳酸钠渣与铜液中Se的分配比例，对含Se氧化物渣在1423K～1523K温度下的热力学性质进行了测量。(1)不同CO_2分压下NaO_<0.5>-CO_2-SeO_2渣中NaO_<0.5>活度的电化学测量使用 β"-氧化铝作为固体电解质，在 1 > N (〕SY.gtoreq.〔) 0.667 {N = n_<Na>/(n_<Na>+n_<Se>) 的组成范围内，n ：摩尔数}。(2) 熔渣和熔融铜之间 Se 的分布平衡测量，(3) CO_2 在熔渣中的溶解度测量最后根据结果，估算了1423 K和1523 K温度下炉渣和铜液之间Se的平衡分配比与CO_2和氧分压以及炉渣成分的函数关系。在较高氧分压和较低CO_2分压的条件下获得了较高的分配比。还对N * 1的炉渣进行了实验为了评估氧分压对分配比的影响。 Se 的分配比对氧分压有两种不同的依赖性。在较低的氧分压下，两种元素的分配比都随着氧分压的增加而减小，而在较高的氧分压下，Se的分配比随着氧分压的增加而增加。在这两个领域，均在以下条件下实现了较高的分配比率 CO_2分压较低。