论文部分内容阅读
取自西弗吉尼亚州中部一矿山的酸性排放物试样中含有3.6%Mn、0.18%Ni、0.15%Co以及0.39%Zn。在室温条件下,硫酸溶液pH值为3时,对此试样进行了浸出。pH为4.5时,将空气充入浸出溶液中,以使铁沉淀。浸出溶液含有258ppmZn、105ppmNi、90ppmCo以及2050ppmMn。在后续操作中,采用DEHPA(双—乙基己基磷酸)、Cyanex272及Lix84对3种溶剂萃取法进行了研究,以选择性萃取上述金属离子。A/O比例为1。用煤油稀释浸出剂,煤油与浸出剂的比例为10:1。采用DEHPA的溶剂浸出研究表明,在镍或钴不存在的情况下,pH值为2.75时可以萃取锌。目前认为,能最大限度地从锰中选择性分离锌的最佳pH值为2.75。钴与锰的分离因素是,用Cyanex272可以同时萃取这两种金属离子。钴与镍的分离因素表明,pH为5.3时可以有效地分离两种金属离子。pH为5.5以上时,采用Lix84也可以有效地萃取镍。
Acid discharge samples taken from a mine in Central West Virginia contained 3.6% Mn, 0.18% Ni, 0.15% Co and 0.39% Zn. At room temperature, sulfuric acid solution pH value of 3, the sample was leached. At a pH of 4.5, air is charged to the leach solution to precipitate the iron. The leach solution contained 258 ppm Zn, 105 ppm Ni, 90 ppm Co, and 2050 ppm Mn. In the subsequent operation, three kinds of solvent extraction methods, DEHPA (bis-ethylhexylphosphoric acid), Cyanex272 and Lix84, were studied to selectively extract the above metal ions. A / O ratio of 1. Dilute kerosene with kerosene, kerosene and leaching agent ratio of 10: 1. Solvent leaching studies using DEHPA show that zinc can be extracted at pH 2.75 in the absence of nickel or cobalt. At present it is considered that the optimum pH value for maximizing the selective separation of zinc from manganese is 2.75. The separation factor between cobalt and manganese is that the two metal ions can be simultaneously extracted with Cyanex 272. The separation factor of cobalt and nickel shows that the two metal ions can be effectively separated at a pH of 5.3. With pH above 5.5, Lix84 is also effective for nickel extraction.