Studies on Extraction and Refining Non-Ferrous Metals

有色金属提取与精炼研究

• 批准号: 10044145
• 负责人: OKIDO Masazumi
• 金额: $ 3.26万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10044145/
• 关键词: Soft solution process; Recovery of noble metals; Alkaline solution; Recycle of gold; Alkaline thiourea solution; Quartz crystal microbalance; リサイクル; 非鉄人工資源

Fundamental study on recovery of gold from scraps has been carried out using soft-solution process in aqueous solution at room temperature. The solution containing thiourea, sodium sulfite and thiosulfate in alkaline accelerated the dissolution of gold by electrolysis. This solution however inhibited the dissolution of cheap metals such as steel, aluminum, copper and so on. Therefore, it was found that selective dissolution of gold was possible in the recovery from scraps in physically mixed state. The ultimate conditions for the gold selective recovery were examined by means of quartz crystal microbalance technique. It is represented as follows : pH : 11-13, the electrode potential : ca. 0.5 V vs Ag / AgCl reference electrode, the concentration of chemicals : 0.1 - 1 mol/L. Gold dissolves in the solution through the formation of complicated ions with thiourea and thiosulfate. The sulfite ions added in the solution play a stabilizer for thiourea.On the other hand, the recoveries of cobalt metal from used battery and tungsten from waste alloys were investigated in hydrometallurgical method.

对常温水溶液软溶法从废金中回收金进行了基础性研究。在碱性条件下，含有硫脲、亚硫酸钠和硫代硫酸盐的溶液加速了金的电解溶解。然而，这种溶液抑制了钢、铝、铜等廉价金属的溶解。因此，在从物理混合状态的废料中回收金时，金的选择性溶解是可能的。用石英晶体微天平技术考察了金选择性回收的最终条件。当pH为11-13，电极电位为0.5V，试剂浓度为0.1-1mol/L时，金通过与硫脲和硫代硫酸盐形成络合离子而溶解于溶液中。溶液中加入的亚硫酸盐离子对硫脲起到了稳定剂的作用。另一方面，采用湿法冶金方法研究了从废旧电池中回收金属钴和从废合金中回收钨的方法。

项目成果

X.Guo: "A Novel Process for Reutilization of Spent WC-Co Cemented Carbide,"Proceedings of fifth International Symposium on East Asia Recycling Technology [Published by MMIJ]. 17-20 (1999)

X.郭：“废WC-Co硬质合金再利用的新工艺”，第五届东亚回收技术国际研讨会论文集[MMIJ出版]。

D.Wei: "The Selective Dissolution of Gold in an Alkaline Thiourea Solution"Proceedings of The Fourth International Conference on Ecomaterials. 255-258 (1999)

D.Wei：“碱性硫脲溶液中金的选择性溶解”第四届国际生态材料会议论文集。

L.Chai: "A Rapid Method for Determination of Growth of Thiobacillus ferrooxidans with Series Piezoelectric Quartz Crystal"Analytical Letters. 32・12. 2443-2454 (1999)

L.Chai：“用串联压电石英晶体测定氧化亚铁硫杆菌生长的快速方法”分析快报 32・12 (1999)。

L.Chai: "Recovery of Valuable Metals from a Cobalt-based Alloy waste Utilized in Battery"Proceedings of fifth International Symposium on East Asia Recycling Technology [Published by MMIJ]. 35-38 (1999)

L.Chai：“从电池中使用的钴基合金废料中回收有价金属”第五届东亚回收技术国际研讨会论文集[由 MMIJ 出版]。

L. Chai: "Effect of Na_2SO_3 on Electrochemical Aspects of Gold Dissolution in Alkaline Thiourea Solution"Hydrometallurgy. 53・3. 255-266 (1999)

L. Chai：“Na_2SO_3 对碱性硫脲溶液中金溶解的电化学影响”湿法冶金学 53・3（1999）。