Analytical study of the Waelz clinker dissolution in NH3 - (NH4)2SO4 system
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2014-02-25
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Abstract
In the NH3-(NH4)2SO4 system a thermodynamical analysis of dissolution process of the Waelz clinker, which is a waste product of zinc production, has been carried out. The analytical study has been executed by the help of a professional program HSC Chemistry Ver. 7.1 using both modules ``Reaction Equation`` and ``Eh - pH Diagrams``. The NH3-Fe-S-H2O, NH3-Cu-S-H2O and NH3-Ag-S-H2O systems describing the dissolution of iron, copper and silver compounds (oxides and sulfides) of Waelz clinker in an ammonia medium in the presence of ammonium salt (NH4)2SO4 have been investigated at various temperatures and pressures. The influence of temperature (25 and 110°C), pressure (atmospheric and 0.4 MPa) and the consumption of the reagents on the substance composition of the solutions has been defined on the basis of the calculated and constructed Eh - pH diagrams.