Oxide Dissolution Losses of Copper, Lead and Tin in Slags

炉渣中铜、铅、锡的氧化物溶解损失

• 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

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、铅或锡的冶炼中，脉石矿物和杂质被浓缩到渣相中，有价值的金属以熔融状态被回收。在熔炼步骤中，一定量的有价金属以溶解和悬浮的形式损失到炉渣中。在冶炼过程中，尽量减少有价金属向炉渣的损失是非常重要的。为了阐明渣系组成、氧势和温度对有价金属损失的影响，在1200 ~ 1300 ℃温度范围内进行了这些金属与FeO-CaO-SiO_2渣系之间的平衡实验。实验结果如下：1.渣中铜为一价，铅和锡为二价。渣中金属溶解度的依赖性与其价态有关.二元铁橄榄石渣（FeO_x-SiO_2）和铁素体渣（FeO_x-CaO）中铜和锡的含量相近，而远高于三元铁橄榄石渣（FeO_x-CaO-SiO_2）中的铜和锡的含量。在FeO_x-CaO-SiO_2三元渣系中，铜和锡的溶解度最低，渣系成分接近饱和，含固体二硅酸钙和25%氧化铁。渣系组成为FeO_x-CaO-SiO_22，通过碱性CaO中和酸性SiO_2，形成稳定的渣液。铅的氧化物与SiO_2的亲和力大，在SiO_2活度大的铁橄榄石渣中溶解度大。不含SiO_2的铁素体渣能有效降低渣中铅的氧化损失。当渣中不可避免地含有SiO_2时，用CaO中和SiO_2可降低渣中铅的损失。

项目成果

Yoichi,Takeda: Materials Transations,JIM.

余一，武田：材料翻译，JIM。

Akira Yazawa: "Phase Separation among Oxides and Sulphides and Thier Metallurgical Implications" Proceedings of the 3rd International Conference on Molten Slags and Fluxes,Glasgow.56/1-56/2 (1988)

Akira Yazawa：“氧化物和硫化物之间的相分离及其冶金意义”第三届国际熔渣和熔剂会议记录，格拉斯哥.56/1-56/2 (1988)

Akira Yazawa: "Phase Separation among Oxides and Sulphides and Thier Metallurgical Implications" Proceedings of the 3rd International Conference on Molten Slags and,Fluxes,Glsgow.56/1-56/2 (1988)

Akira Yazawa：“氧化物和硫化物之间的相分离及其冶金意义”第三届国际熔渣和熔剂会议记录，Glsgow.56/1-56/2 (1988)

Yoichi Takeda: "Dissolution Loss of Copper,Tin and Lead in FeO_n-SiO_2-CaO Slag" Proceedings of the International Symposium on Productivity and Technology in Metallurgical Industries. 227-240 (1989)

武田洋一：《FeO_n-SiO_2-CaO渣中铜、锡和铅的溶解损失》冶金工业生产力与技术国际研讨会论文集。

A. Yazawa and Y. Takeda: "Phase Separation among Oxides and Sulphides and Their Metallurgical Implications" 3rd International Conference on Molten Slags and Fluxes, Glasgow, June 1988.

A. Yazawa 和 Y. Takeda：“氧化物和硫化物之间的相分离及其冶金意义”，第三届熔渣和熔剂国际会议，格拉斯哥，1988 年 6 月。