两段沉淀法净化某废旧高温合金浸出液的研究

Study on Purification of Superalloy Scrap Lixivium by Two-stage Precipitation

采用两段沉淀法净化某废旧高温合金浸出液,第一段采用质量分数为15%的磷酸钠溶液作为沉淀剂,机械搅拌条件下,控制终点pH 2.5,温度70℃,反应时间2h,铬、铝的除杂率均在90%以上;第二段采用质量分数为15%的氢氧化钠溶液作为沉淀剂,机械搅拌条件下,控制终点pH 5.5,温度70℃,反应时间2h,铬、铝的脱除率均在99%以上,所得净化液可直接进行下一步镍钴分离处理,扩大试验结果表明,此工艺有良好的工业应用前景。

Two-stage precipitation process was applied to purify leaching solution of superalloy scrap. In the first stage, removal rate of impurities of Cr and A1 are all 90% above with mass concentration of 15% Na3PO4 as precipitation agent under the conditions including pH value of end point of 2.5, temperature of 70 ℃, and reaction time of 2 h. In the second stage, removal rate of impurities of Cr and A1 are all 99% above with mass concentration of 15% NaOH as precipitation agent under the conditions including pH value of end point of 5.5, temperature of 70℃, and reaction time of 2 h. The purified solution can be directly used to separate Ni and Co. The expanding test results show that this process has better industrial application prospect.