【摘要】 通过对Ｆｅ（ Ⅱ）Ｍｎ（ Ⅱ）Ｚｎ（ Ⅱ）ＮＨ４ＨＣＯ３ＮＨ３·Ｈ２ＯＨ２Ｏ 体系进行热力学分析计算， 给出了溶液中Ｆｅ（Ⅱ）、Ｍｎ（Ⅱ）、Ｚｎ（ Ⅱ） 的浓度与ｐＨ 值的关系， 由此确定３ 种金属离子共沉淀完全的ｐＨ值范围。指出该ｐＨ 值范围主要由Ｚｎ２＋ 沉淀完全的酸度条件决定， 而后者则取决于碳酸氢铵与氨的加入量。更多还原

【Abstract】 Abstract: The thermodynamic analysis on the system of Fe(Ⅱ) Mn(Ⅱ) Zn(Ⅱ) NH 4HCO 3 NH 3·H 2O H 2O was carried out. The suitable pH value of coprecipitation was determined from the ratio of NH 4HCO 3 and NH 3·H 2O and from the relations between the pH value and total concentrations of Fe(Ⅱ), Zn(Ⅱ) and Mn(Ⅱ). The results show that Fe(Ⅱ), Zn(Ⅱ) and Mn(Ⅱ) could be completely coprecipitated with NH 4HCO 3 and NH 3·H 2O as precipitants at a suitable pH value and a suitable ratio of NH 4HCO 3 and NH 3·H 2O.更多还原