Ca^(2+)、Fe^(3+)沉淀分离HPO_3^(2-)和H_2PO_2^-的研究

Research of Separating HPO_3^(2-) and H_2PO_2^- Using Ca^(2+) or Fe^(3+)

采用Ca2+和Fe3+作为沉淀剂分离HPO32-和H2PO2-,研究了Ca2+和Fe3+的加入量、反应温度和陈化时间对分离效果的影响。结果表明,Ca2+作为沉淀剂时,[Ca2+]/[HPO32-]=0.94,处理温度50℃,陈化时间5h条件下HPO23-去除率达到93.1%,而H2PO2-的损失率为1.06%。Fe3+作为沉淀剂时,[Fe3+]/[HPO23-]=1.02,室温下处理,陈化时间6h条件下HPO32-去除率达到75.4%,而H2PO2-的损失率为10.6%。

Ca2＋ or Fe3＋ were used as precipitant to separate H2PO 2and HPO32-.The effects of different dosage,reaction temperature and aging time were investigated.The results showed that when adding Ca2 ＋ under the condition of [Ca2＋ ]/[HPO32-]=0.94,treatment temperature 50 ℃,aging 5h,the removal rate of HPO32-reached 93.1%,while the loss of H2PO 2was 1.06%.When adding Fe3 ＋ under the condition of [Fe3 ＋ ]/[HPO32-]= 1.02,room temperature,aging 6h,removal rate of HPO 3reached 75.4% ,while the loss of H2PO 2was 10.6%.