Optimization of leaching conditions for extraction of magnesium from a chromite beneficiation plant tailing predominantly containing lizardite

Indexed In

Volume 164 / 2021

Authors:

Hakan ÇİFTÇİ, Bekir ARSLAN, Ayşegül BİLEN, Zeyni ARSOY, Bahri ERSOY

Keywords:

Leaching, Lizardite, Magnesium, Amorphous silicate, Chromite plant tailing.

Abstract:

In this study, leaching experiments were performed for extraction of magnesium from a chromite beneficiation plant tailing predominantly containing lizardite. The X-ray fluorescence (XRF) and X-ray  diffraction  (XRD)  analyzes  showed  that  the  tailing  sample  contains  39.3wt.%  MgO and consist of predominantly lizardite mineral. Hydrochloric acid (HCl) and sulphuric acid (H₂SO₄) were used as acids separately in leaching experiments. Acid concentration, leaching temperature, leaching time, and solid ratio were investigated as leaching parameters and optimized. Maximum magnesium extraction yield was determined to be nearly 98% for both acids under optimum leaching parameters which leaching temperature was 85°C, solid ratio was 20wt.%, leaching time was 120 minutes, and acid concentrations were 6 M for HCl and 4 M for H₂SO₄. In addition, it was determined that the leaching residue as a solid state was mainly composed of amorphous silicate according to the XRD analysis. Dissolution rate data were explained using Jander equation. Mg dissolution process found to be diffusion controlled.

https://doi.org/10.19111/bulletinofmre.827630

DOI:

https://doi.org/10.19111/bulletinofmre.827630