Abstract
The viscosity of melted slags is one of the most important control factors in the operation of sewage sludge melting facilities. Therefore it is imperative to understand the features of viscosity dependent on temperature and composition.
However, there are very few measurement data available on the viscosity for melted slag of sewage sludge.
This paper first presents a summary of the basic knowledge about viscosity and then establishes the methods of preparing test samples and the procedures for measuring the viscosity of melted slag at high temperatures using an outer cylinder rotating viscometer. Next the paper reports the results of the viscosity measurments.
These results show that in the case of melted slag of sewage sludge there is a high probability correlation between frequency coefficient and activation energy, which is defined in the Andrade theory. These factors have been previously thought to be independent constants.
Furthermore, this paper suggests a presumptive equation for viscosity with a parameter of activation energy and considers the range and the precision of its application
