湿法冶金

研究了采用空气氧化、氢氧化钠浸出、硝酸酸化工艺从废钼催化剂中回收Mo、Co、Ni等有价金属。试验结果表明:在空气流量30L/min、氢氧化钠加入量为金属Mo理论耗量1倍、浸出温度85℃条件下,钼浸出率达99.8%;碱浸渣用硝酸酸化、双氧水除铁,双氧水加入量为铁理论量的2～3倍,反应温度70℃;滤液用NaOH溶液调pH为9.5,镍、钴以氢氧化物形式沉淀,酸溶后,用P507萃取剂萃取分离钴、镍。该工艺采用空气氧化,避免了传统焙烧工艺MoO3的挥发损失;用NaOH浸出Mo,生产成本降低,工艺流程简单,金属回收率较高。

Recovery of Mo,Co and Ni from spent catalyst by air oxidation-NaOH leaching-HNO3acidification process was studied.Experimental results show that the leaching of Mo is 99.8% under the conditions of air flow of 30L/min,NaOH usage of doubled the theoretical Mo consumption,leaching temperature of 70℃.The iron is removed from the residue by HNO3acidification and H2O2oxidation at the conditions of 70 ℃ and H2 O2 usage of 2-3times iron consumption.When filtrate pH is controlled at 9.5,Ni and Co are precipitated in the forms of hydroxides,and then are separated by acid dissolving and solvent extraction using P507.The method can avoid MoO3 evaporation,and has low production cost and high metal recovery.