从废弃稀土抛光粉中回收稀土金属的工艺条件研究

发布时间：2018-04-29 08:16

  本文选题：废弃稀土抛光粉 + 浸出率　； 参考：《合肥工业大学》2015年硕士论文

【摘要】：废弃稀土抛光粉中含有镧、铈等有价金属元素,若能回收循环利用将具有重要的环境意义和经济价值。论文以废弃稀土抛光粉为原料,构思并设计了浓硫酸浸出、稀土硫酸钠复盐回收稀土金属元素、稀土元素的分离与回收等工序构成的工艺流程。通过单因素条件实验和正交实验,考察并确定了流程中各工序较适宜的工艺条件,所得主要结论如下：(1)浓硫酸浸出工序较适宜的反应工艺条件为：反应时间100min、反应温度270℃、酸粉比为2.6,此条件下稀土金属元素的浸出率达到98.04%。(2)稀土硫酸钠复盐回收稀土金属元素工序较适宜的工艺条件为：体系pH值2.0、无水硫酸钠与稀土元素的质量比5.2：1、反应温度65℃、反应时间为120s。此条件下稀土金属元素的回收率为95.03%。(3)氢氧化铈制备工序较适宜的工艺条件为：过氧化氢与氨水的摩尔比1.2：1、分解温度92℃、分解时间42min。此条件下氢氧化铈中铈的氧化率为98.46%,铈的平均收率为98.76%。(4)采用草酸沉淀的形式回收硝酸镧溶液中的镧元素,镧的收率为92.03%。(5)所制备的样品为纯相的面心立方晶型氧化铈和六方晶型氧化镧。
[Abstract]:The waste rare earth polishing powder contains valuable metal elements such as lanthanum and cerium. If it can be recycled it will have important environmental significance and economic value. In this paper, the technological process of concentrated sulfuric acid leaching, recovery of rare earth metal elements by sodium sulfate compound salt, separation and recovery of rare earth elements, etc., was conceived and designed by using waste rare earth polishing powder as raw material. Through single factor experiment and orthogonal experiment, the optimum technological conditions of each procedure in the process were investigated and determined. The main conclusions are as follows: reaction time 100 min, reaction temperature 270 鈩，

本文编号：1819129