Research Initiation: A Study of the Effect of Chemical Complexation in Precipitation and Crystallization Processes

研究启动：化学络合在沉淀和结晶过程中的影响研究

• 批准号: 8504405
• 负责人: David Luerkens
• 金额: $ 6.86万
• 依托单位: University of Iowa
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1985
• 资助国家: 美国
• 起止时间: 1985-10-01 至 1988-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8504405&HistoricalAwards=false
• 关键词: Research; Initiation; Study; Effect; Chemical

The effect of chemical complexation on the precipitation of metal cations in a strong acid medium by the addition of anions of a weak acid is investigated. Chemical kinetic models of precipitation based on second order consecutive reactions are used to represent the kinetics of complexation and precipitation. These models are compared with data from two stage precipitation experiments using the following chemical systems: 2La(NO3)3 + 3H2 = 3H2C2O4 + 6HNO3 and Ca(OH)2 + H2SO4 = CaSO4 + 2H2O. The particle size distribution and particle morphology are correlated with the condition which determines the crystallization kinetics. A novel technique based on Fourier series descriptors of the crystal shape is applied to characterize the shapes of the crystals formed in this work.

络合作用对金属沉淀的影响 阳离子在强酸性介质中加入阴离子的弱 酸进行了研究。 降水化学动力学模型 二级连续反应用于代表 络合和沉淀动力学。 对这些模型进行了比较 使用来自两阶段沉淀实验的数据，使用以下 化学体系：2La（NO3）3 + 3H2 = 3H2C2O4 + 6HNO3和Ca（OH）2 + H2SO4 = CaSO4 + 2H2O。 粒度分布和颗粒 形态学与决定 结晶动力学 一种基于傅里叶级数的新方法 应用晶体形状的描述符来表征形状 在这项工作中形成的晶体。