溶液电导率法对碳酸钙结晶动力学的研究

溶液电导率法对碳酸钙结晶动力学的研究;结垢;电导率

Study on Kinetics of Formation of CaCO3 Crystal by Solution Conductivity Measurement

The kinetics of calcium carbonate scale formation has been studied based on the conductivity measurement including the rate of the nucleus formation and crystal growth as well as the influences of temperature and the scale inhibitors. The reaction constant and activation energy in the presence of scale inhibitors at different temperatures have been calculated. It shows that the nucleus formation and crystal growth can be expressed as a first order reaction. Temperature and scale inhibitor mainly influence the rates of nuclei formation. The higher temperature, the greater the reaction rate. In some scope of supersaturation, the induction period of calcium carbonate can be prolonged and the rate of calcium carbonate can be reduced by adding a certain concentration of scale inhibitor. But the reaction order remained unchanged. Once the nucleus has formed in the supersaturation solution, the crystal growths more easily. That is, the condition of crystal growth is the presence of a nucleus, the temperature and scale inhibitors have little effect on crystal growth.