Abstract
The production of synthetic tantalum concentrate (SynCon) from process residues, sludges or tin slags generates huge amounts of high melting slag, mostly comprising of Al2O3, CaO and SiO2. The metal/slag separation is a major criterion in the multi-stage pyrometallurgical procedure to ensure product quality and yield, wherefore the flow properties of respective slags depict essential preconditions. Hot stage microscope tests are performed to investigate the melting behaviour of synthetic SynCon slags under process near conditions (temperature range of 1000–1600 °C and reducing as well as inert atmosphere by usage of CO/CO2 and Ar gas). Sample analyses via REM/EDX and measured flow temperatures are compared to thermodynamic calculations conducted with FactSage 7.1 to enhance process control and to obtain first conceptions on the melting range and the slag viscosity, which are influenced by slag composition and temperature.
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