A study on leaching kinetics of chalcopyrite in KNO3 + H2SO4 medium

Year 2019, Volume: 3 Issue: 1, 38 - 45, 28.06.2019

Harun Dikme Soner Kuşlu , Özlem Karagöz

https://doi.org/10.32571/ijct.515611

Abstract

This paper describes the leaching
behaviour and dissolution kinetics of chalcopyrite wıth
potassium nitrate in sulphuric acid solutions. Reaction temperature,
solid/liquid ratio, stirring speed, chalcopyrite particle size, concentration
of sulphuric acid and concentration of potassium nitrate solutions were
selected as process parameters. The experimental results were successfully
correlated with linear regression using the Statistical package program and
dissolution curves were evaluated by the shrinking core models for solid-fluid
systems. Finally, it was found that increasing reaction temperature and
decreasing solid/liquid ratio caused an increase in the dissolution rate of
chalcopyrite. The dissolution extent slightly increased with
the increase in the stirring speed rate between 300-900 rpm under the
experimental conditions. The activation energy was
found as 78.25 kJ mol^-1. It was seen that the leaching of
chalcopyrite was controlled by surface chemical reactions.

 

Keywords

Chalcopyrite, KNO3, leaching kinetics, shrinking core model.

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