摘要
通过对Fe(Ⅱ) Mn(Ⅱ) Zn(Ⅱ) Ca(Ⅱ) Mg(Ⅱ) NH3 NH4HCO3 H2O体系的热力学分析,得到各金属离子浓度与pH的关系,从而确定共沉法制备锰锌软磁铁氧体前躯体共沉过程中钙、镁深度脱除的共沉区域。热力学分析结果表明,溶液中钙、镁的含量随着体系pH的增大而降低,在相同条件下镁的溶解度大于钙的溶解度。为减少进入共沉粉中的钙、镁含量,需要保证在铁、锰、锌共沉完全的基础上降低体系的pH。当溶液中[C]T=0 1mol/L,[N]T=1 0mol/L时,pH控制在6 23～6 50之间可以大大降低进入共沉粉中的钙、镁含量。确定共沉过程钙、镁深度脱除的共沉区域,对于生产高纯锰锌软磁铁氧体前躯体具有重要的指导意义。
By thermodynamic analysising on system of Fe(Ⅱ)Mn(Ⅱ)Zn(Ⅱ)Ca(Ⅱ) Mg(Ⅱ)NH3NH4HCO3H2O,the relationship between pH and total concentration of Fe(Ⅱ), Mn(Ⅱ), Zn(Ⅱ), Ca(Ⅱ), Mg(Ⅱ) and the coprecipitation field of calcium and magnesium was established. The thermodynamic analysis results show that contents of calcium and magnesium in solution decreases with pH increasing, and under the same conditions,solubility of magnesium is greater than that of calcium. In order to reduce contents of calcium and magnesium in coprecipitation powder, pH of the system must be reduced when Fe(Ⅱ), Mn(Ⅱ), Zn(Ⅱ) are precipitated. When [C]T=01mol/L and [N]T=10 mol/L, the percent of calcium and magnesium in precursor can be decreased if pH is controlled in range of 623～65The coprecipitation field of calcium and magnesium is of very important to direct preparation of overpurity MnZn ferrite precursor.
出处
《湿法冶金》
CAS
2003年第4期200-203,共4页
Hydrometallurgy of China
基金
科技部中小企业创新基金(01C26215110973)。
关键词
锰锌铁氧体
前躯体
共沉淀
热力学
钙
镁
脱除
制备
Mn-Zn ferrite precursor
coprecipitation
thermodynamic analysis
calcium and magnesium
removal
