从废旧高温合金的硫酸浸出渣中浸出分离钨钼铼

对废旧高温合金硫酸浸出残渣选择HCl-FeCl3-H2O2体系氧化浸出、浸出后加入NaOH调节溶液pH值，使钨、钼、铼与铌、钽等分离，研究了反应时间、反应温度、HCl用量、FeCl3用量、H2O2用量对钨、钼、铼浸出率的影响. 结果表明，该体系能充分浸出渣中钨、钼、铼3种金属，添加FeCl3可提高钼在盐酸溶液中的浸出率. 在浸出温度70℃、浸出时间5 h、FeCl3用量100 g/L、H2O2用量10 mL/g及HCl初始用量10 mL/g的条件下，钨、钼、铼浸出率分别大于97%, 86%, 91%.

Leaching and Separation of Tungsten,Molybdenum and Rhenium from Waste Superalloys after Sulfuric Acid Leaching

The HCl-FeCl3-H2O2 system was chosen for leaching of the slag from the leaching of superalloys with sulfuric acid, then the pH value of leaching solution adjusted with NaOH for separation of W, Mo and Re from Nb and Ta. The influential factors of leaching of W, Mo and Re, such as amount of HCl, amount of FeCl3, amount of H2O2, temperature, and leaching time were investigated. In the leaching process, FeCl3 could improve the leaching rate of Mo in the hydrochloric acid solution. At the optimum conditions of HCl 10 mL/g, FeCl3 100 g/L, H2O2 10 mL/g, temperature 70℃, and leaching time 5 h, the leaching rate of W, Mo and Re was above 97%, 86% and 91%, respectively.