硝酸溶液中钼锆沉淀溶度积的研究

STUDY OF SOLUBILITY PRODUCT ON PRECIPITATE OF MOLYBDENUM AND ZIRCONIUM IN NITRIC ACID

摘要: 应用X 射线荧光分析、热重分析、X 射线衍射以及红外光谱分析法研究了钼锆沉淀的组成和特征。结果表明 ,在 1 0mol/L硝酸溶液中 ,沉淀可能是ZrMo2 O7(OH ) 2 ·2H2 O和Zr(MoO4) 2 ·2H2 O的混合物 ;在浓度为2 0mol/L以上的硝酸溶液中 ,沉淀为Zr(MoO4) 2 ·2H2 O。实验还测定了 1 0 ,2 0 ,3 0mol/L硝酸溶液中钼锆沉淀的表观溶度积K′sp,讨论了硝酸浓度、钼锆初始浓度对表观溶度积的影响。结果发现 ,硝酸浓度增加 ,K′sp值变大 ,而钼锆初始浓度的不同对K′sp没有明显的影响。

Abstract: The composition and character of precipitates of Mo and Zr are studied by XFA, TGA, XRD and IR methods. The results show that the precipitate can be present in the form of a mixture of ZrMo 2O 7(OH) 2·2H 2O and Zr(MoO 4)·2H 2O in 1.0 mol/L HNO 3, and the formula Zr(MoO 4) 2·2H 2O in ≥2 0 mol/L HNO 3. Some data about apparent solubility product ( K ′ sp ) of Mo and Zr precipitates have been determined in 1.0, 2.0, and 3.0 mol/L HNO 3 solutions. The effects of different concentration of nitric acid and initial concentration of Mo and Zr on the apparent solubility product are also investigated. It is found that K ′ sp increases with increasing nitric acid concentration. The initial concentration of Mo and Zr dose not influence K ′ sp .