共沉淀制备MnZn铁氧体前驱体粉的热力学分析  

Thermodynamic Analysis on the Preparation of MnZn Ferrite Precursor via Chemical Co-precipitation

作　　者：夏井兵[1] 代建清[1] 李国福[1] 胡志刚 

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093 [2]河北钢铁集团,邯郸050000

出　　处：《材料导报》2012年第12期141-145,共5页Materials Reports

基　　金：云南省中青年学术技术带头人后备人才培养项目(2006PY01-09)

摘　　要：针对Me(Me=Fe2+、Mn2+、Zn2+)-NaOH-H2O体系、Me-NaOH-Na2CO3-H2O体系以及Me-NH4HCO3-NH3.H2O-H2O体系,根据最新的热力学数据及离子在水溶液中的存在形式,进行了最新的热力学计算,得到了各金属离子[Me]T与pH值之间的关系,并给出了不同条件下的log[Me]T-pH曲线,从而确定3种金属离子的共沉淀范围。结果表明,在Me-NaOH-H2O体系中,控制pH值在10.0～10.7之间,可以让3种金属离子共沉淀;在Me-NH4HCO3-NH3.H2O-H2O体系中,决定3种离子共沉淀范围的是Zn2+的完全沉淀范围,当[C]T=0.5mol/L、[N]T=0.75mol/L时,控制pH值在6.0～7.5之间,可满足三者的共沉淀要求;在Me-NaOH-Na2CO3-H2O体系中,当[C]T=0.5mol/L时,控制反应体系的pH值在6.3～10.6之间,就可以保证3种金属离子共沉淀,从而获得成分准确的前驱体粉料。According to the latest thermodynamic data, the thermodynamic analysis of different Me ions（Me= Fe^2＋ , Mn^2＋ , Zn^2＋ ） on the system of Me-NaOH-H2 O, Me-NaOH-Na2 CO3-H20 and Me-NH4 HCO3-NH3· H2 O-H2O was carried out. The relationship between the total concentration of Me and pH value was obtained, and the field of co-precipitation of Me was got at a suitable pH value. It shows that Fe^2＋ , Mn^2＋ and Zn^2＋ can co-precipitate in MeNaOH-H2O system at the pH value of 10. 0410. 7. In Me-NH4 HCO3-NHa · H2O-H2O system, when the pH value is 6. 047.5, the total carbon concentration [C]T =0. 5mol/L and the total nitrogen concentration [N]T =0. 75mol/L, the three metal ions Me can co-precipitate completely. In order to obtain the precursor with accurate composition by co-precipitation in Me-NaOH-Na2 CO3 H20 system with the total carbon concentration [C]T = 0.5mol/L, the pH value must be dominated between 6.3 and 10. 6.

关 键 词：无机非金属材料 锰锌铁氧体 化学共沉淀法 热力学分析 

分 类 号：TM277.5[一般工业技术—材料科学与工程]