Oxide Dissolution Losses of Copper, Lead and Tin in Slags

炉渣中铜、铅、锡的氧化物溶解损失

基本信息

批准号：
63550484
负责人：
TAKEDA Yoichi
金额：
$ 1.09万
依托单位：
Iwate 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：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63550484/
关键词：
Slag loss Copper smelting Slag-metal equilibrium Lead smelting Tin smelting Distribution equilibrium Miscibility Solubility of oxide 銅製錬鉛製錬錫製錬溶解度平衡実験二液分離溶融製錬

项目摘要

In copper, lead or tin smelting, gangue minerals and impurities are concentrated into slag phase and valuable metals are recovered as molten state. Some amount of valuable metal losses to slag as dissolution and suspension in the smelting step. It is very important to minimize the valuable metal loss to slag in the smelting. To clarify effects of slag composition, oxygen potential and temperature on valuable metal loss, equilibrium experiments between these metals and FeO-CaO-SiO_2 slags were carried out at the temperature of 1200 to 1300ﾟC. The experimental results are summarized as follows.1. Copper in slag was mono-valent and lead and tin in slag were di-valent. The dependence of metal solubility in slag related to its valency.2. The contents of copper and tin were similar for both binary fayalite (FeO_x-SiO_2) and ferrite (FeO_x-CaO) slag, and much higher than those in ternary FeO_x-CaO-SiO_2 slag. The minimum solubilities of copper and tin were observed in the ternary FeO_x-CaO-SiO_2 slag whose composition were close to saturation with solid di-calcium silicate and 25% iron oxide. The slag composition of the ternary FeO_x-CaO-SiO_22 forms a stable slag solution by neutralization of acidic SiO_2 with basic CaO.3. Big solubility of lead whose oxide had a big affinity with SiO_2 was observed in fayalite slag with big activity of SiO_2. Ferrite slag free from SiO_2 was effective to reduce oxide lead loss in slag. When slag contains SiO_2 inevitably, neutralization of SiO_2 with CaO reduces lead loss in slag.

在铜，铅或锡冶炼中，岩矿物和杂质集中在炉渣相中，并以熔融状态回收有价值的金属。在冶炼步骤中，有一定数量的有价值的金属损失作为溶解和悬浮液。将有价值的金属损失最小化以使冶炼中的矿渣损失最为重要。为了阐明炉渣组成的影响，氧电位和温度对有价值的金属损失，这些金属和Feo-Cao-Sio_2槽之间的平衡实验是在1200至1300°C的温度下进行的。实验结果总结如下1。炉渣中的铜是单价值，炉灶中的铅和锡是含量。金属溶解度在炉渣中的依赖性与其价值相关。2。对于二进制fayalite（feo_x-sio_2）和铁酸盐（feo_x-cao）炉灶的铜和锡的含量都相似，并且比ternary feo_x-cao-sio_2炉渣中的含量相似。在三元feo_x-cao-sio_2炉渣中观察到铜和锡的最小溶解度，其组成与固体二硅硅硅酮和25％氧化铁接近饱和。三元feo_x-cao-sio_22的炉渣组成通过用碱性cao.3中和酸性sio_2形成稳定的炉渣解。在Fayalite炉渣中观察到氧化铅的大溶解度与SIO_2具有很大的亲和力，并具有SIO_2的大活动。没有SIO_2的铁氧体炉渣可有效减少炉渣中的氧化铅损失。当炉渣不可避免地包含SIO_2时，SIO_2中和CAO的中和会减少炉渣中的铅损失。