(1. 广州有色金属研究院 稀有金属研究所，广州 510650；
2. 中南大学 冶金与环境学院，长沙 410083；
3. 广东省稀土开发及应用重点实验室，广州 510650)
摘 要: 对高镁低品位复杂铂钯精矿进行工艺矿物学分析，提出采用硫酸氧压浸出工艺对该精矿中的贱金属铜、镍、铁选择性浸出分离并富集铂钯的处理工艺。考察磨矿粒度、反应温度、时间、初始硫酸浓度、氧压、搅拌速度、木质素磺酸钙用量、液固比对铜、镍、铁浸出率及渣率的影响，确定最佳工艺参数。实验结果表明：当精矿粒度小于43 μm占有率为93%、时间3 h、浸出温度150 ℃、初始硫酸浓度2 mol/L、氧分压0.7 MPa、搅拌速度400 r/min、添加剂木质素磺酸钙用量0.6 g、液固比5:1的最佳工艺条件下，铜浸出率达99.27%、镍浸出率达98.04%、渣率为37%左右，铂钯几乎不被浸出，铂和钯在浸出渣中富集近3倍。
关键字: 铂；钯；浮选精矿；氧压浸出
（1. Department of Rare Metal, Guangzhou Research Institute of Non-ferrous Metals, Guangzhou 510650, China;
2. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
3. Guangdong Province Key Laboratory of Rare Earth Development and Application, Guangzhou 510650, China）
Abstract:The process mineralogy investigation and the oxygen pressure leaching of low grade Pt-Pd concentrate with high content of magnesium were studied. Sulfuric acid pressure-oxidation leaching process was employed to achieve the selective leaching of copper, nickel, iron and enrichment of Pt-Pd. The effects of process parameters including the particle size, sulphuric acid concentration, the amount of calcium lignosulfonate, oxygen pressure, stirring speed, liquid-solid ratio, leaching temperature and time on the slag rate and leaching rates of copper, nickel and iron were investigated. The results show that leaching rates of copper and nickel are 99.27% and 98.04%, respectively, and slag rate is 37% under the leaching conditions of concentrate particle size d93＜43 μm, leaching time of 3 h, leaching temperature of 150 ℃, sulphuric acid concentration initial 4 mol/L, oxygen pressure of 0.7 MPa, stirring speed of 400 r/min, calcium lignosulfonate of 0.4% and liquid-solid ratio of 5:1. Moreover, Pt and Pd are still not leached and the grade of Pt-Pd concentrate could be increased by 3 times after leaching process.
Key words: platinum; palladium; flotation concentrate; oxygen pressure leaching
