离子交换法从含钼酸浸液中提取钼

Mo Extraction from Acid Leaching Solution Containing Molybdenum by Ion Exchange Method

含钼酸浸液为高温合金废料经氧化酸浸所得,其Mo浓度为0.67 g·L^(-1),采用离子交换法从含钼酸浸液中选择性提取钼;采用碳酸钠溶液调整含钼酸浸液p H后,先用D296树脂从含钼酸浸液中吸附钼,再用氨水和氯化铵混合溶液解吸钼,所得钼酸铵溶液经蒸发浓缩后冷却结晶制得钼酸铵白色晶体,使酸浸液中钼得到有效回收。实验结果表明:通过静态吸附法选择D296强碱性阴离子交换树脂作为Mo的吸附树脂;当树脂床体积为10 ml,反应温度为25℃、料液p H为2、吸附流速为45 ml·h^(-1)时,Mo吸附率达到98.45%;通过Mo吸附曲线测定D296树脂吸附Mo的饱和容量为50 mg·g-1;当氨水浓度为5%,氯化铵浓度为30 g·L^(-1),树脂床体积为10 ml,氨水和氯化铵混合溶液用量为80ml,解吸流速为10 ml·h^(-1),解吸后液中Mo浓度为3.282 g·L^(-1),Mo解吸率达到99.52%;当钼酸铵溶液含钼浓度达到60 g·L^(-1)以上,再冷却至常温结晶12 h以上,所得钼酸铵白色晶体纯度达到97.95%。

Molybdenum was extracted selectively from molybdenum-containing acid leaching solution that was obtained by oxidation acid leaching superalloy scrap with Mo concentration of 0.67 g·L-1 by the mean of ion exchange. The molybdenum was adsorbed from acid leaching solution containing molybdenum by D296 resin after adjusting pH of acid leaching solution containing molybdenum with sodium carbonate solution, followed by desorption of Mo from D296 loaded resin with mixed solution of ammonia and ammonium chloride. Then white crystal of ammonium molybdate was obtained from the ammonium molybdate solution by cooling and crystallizing after evaporative concentrating, which recycled molybdenum effectively. The experimental results showed that D296 strong base anion ex- change resin was selected as the adsorbent resin of Mo using the method of static adsorption. The optimum adsorption parameters were proposed as following： the resin-bed volume of 10 ml, the reaction temperature of 25 % , the stock solution pH of 2, the adsorption flow rate of 45 ml·h-1. With the optimum parameters mentioned above, molybdenum adsorbing rate reached 98.45%. The saturation adsorption capacity of D296 resin was 50 mg·g-1 measured by Mo adsorption curve. When ammonia concentration was 5%, ammonium chloride concentration was 30 g·L-1, the resin-bed volume was 10 ml, the amount of mixed solution of ammonia and ammonium chloride was 80 ml and the desorption flow rate was 10 ml·h-1, the Mo concentration of the desorbed solution was 3. 282 g·L-1 and molybdenum desorbing rate reached 99.52%. When Mo concentration was more than 60 g·L-1, the ammonium molybdate white crystals could be obtained from the ammonium molybdate solution by cooling to room temperature and crystallizing more than 12 h. The purity of the ammonium molybdate reached 97.95%.