Calculation of solid inclusion concentrations from filter cakes

Abstract

Solid inclusions in liquid metal have been a main concern for metallurgical industries. Pressure filtration or preconcentration techniques have been the main methods of measuring solid inclusion contents. The concentrations, however, are usually reported in terms of inclusion area in the filter cake per unit filtrate weight. This unit (mm² kg⁻¹) is not helpful because the 'real' inclusion concentrations are still not known. To date, therefore, no effective scientific method has been used to calculate solid inclusion concentrations. Through the derivations of general equations, inclusion concentrations in liquid metal can be calculated now from volume (area) fraction of the solid inclusions in filter cakes. In addition, the concentrations expressed in inclusion area in filter cakes per unit filtrate weight (mm² kg⁻¹) can also be converted to volume concentrations or other forms. Typical examples to calculate or to convert solid inclusion concentrations are demonstrated in the work.

Keywords:

• PRESSURE FILTRATION
• INCLUSION CONCENTRATION
• LIQUID METAL QUALITY
• ALUMINIUM ALLOY
• CALCULATION METHOD