LEACHING Zn FROM THE LOW-GRADE ZINC OXIDE ORE IN NH3-H3C6H5O7-H2O MEDIA
Abstract In this research, the effect of different citric acid concentrations, ammonia concentration, temperature, leaching time, stirring speed and liquid-to-solid ratio on the zinc leaching from low-grade zinc oxide ore in a NH3-H3C6H5O7-H2O system were studied. The results showed that the zinc le...
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doaj-a51f47a08e2f4b30835267ec723ee35f2020-11-24T22:07:19ZengBrazilian Society of Chemical EngineeringBrazilian Journal of Chemical Engineering1678-438333490791710.1590/0104-6632.20160334s20150376S0104-66322016000400907LEACHING Zn FROM THE LOW-GRADE ZINC OXIDE ORE IN NH3-H3C6H5O7-H2O MEDIAMa Ai-yuanPeng Jin-huiZhang Li-boShiwei LiYang KunZheng Xue-meiAbstract In this research, the effect of different citric acid concentrations, ammonia concentration, temperature, leaching time, stirring speed and liquid-to-solid ratio on the zinc leaching from low-grade zinc oxide ore in a NH3-H3C6H5O7-H2O system were studied. The results showed that the zinc leaching rate is only 4.7% when the citric acid concentration is 0 M, and the leaching efficiency of Zn increased with increasing citric acid concentration. Under the conditions: citric acid concentration of 1.0 M, ammonia concentration of 6 M, temperature of 25 °C, leaching time of 60 min, stirring speed of 300 rpm and the starting solid-to-liquid ratio of 1:5, 81.2% of Zn is leached. The mineralogical changes of the low-grade zinc oxide ores during the processes were characterized by X-ray fluorescence (XRF), X-ray powder diffraction (XRD), Scanning Electron Microscopy associated with Energy Dispersive Spectroscopy (SEM-EDS) and Fourier transform infrared spectroscopy (FT-IR). From the evidence we deduced that citric ions complexed with zinc ions, forming a Zn-citrate complex. As a result, the zinc leaching rate was improved without the risk of pollution or pretreatment. This makes it as a good choice for a more ecological treatment of hemimorphite.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322016000400907&lng=en&tlng=enLow-grade zinc oxide oresHemimorphiteAmmonia leachingCitric acid |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ma Ai-yuan Peng Jin-hui Zhang Li-bo Shiwei Li Yang Kun Zheng Xue-mei |
spellingShingle |
Ma Ai-yuan Peng Jin-hui Zhang Li-bo Shiwei Li Yang Kun Zheng Xue-mei LEACHING Zn FROM THE LOW-GRADE ZINC OXIDE ORE IN NH3-H3C6H5O7-H2O MEDIA Brazilian Journal of Chemical Engineering Low-grade zinc oxide ores Hemimorphite Ammonia leaching Citric acid |
author_facet |
Ma Ai-yuan Peng Jin-hui Zhang Li-bo Shiwei Li Yang Kun Zheng Xue-mei |
author_sort |
Ma Ai-yuan |
title |
LEACHING Zn FROM THE LOW-GRADE ZINC OXIDE ORE IN NH3-H3C6H5O7-H2O MEDIA |
title_short |
LEACHING Zn FROM THE LOW-GRADE ZINC OXIDE ORE IN NH3-H3C6H5O7-H2O MEDIA |
title_full |
LEACHING Zn FROM THE LOW-GRADE ZINC OXIDE ORE IN NH3-H3C6H5O7-H2O MEDIA |
title_fullStr |
LEACHING Zn FROM THE LOW-GRADE ZINC OXIDE ORE IN NH3-H3C6H5O7-H2O MEDIA |
title_full_unstemmed |
LEACHING Zn FROM THE LOW-GRADE ZINC OXIDE ORE IN NH3-H3C6H5O7-H2O MEDIA |
title_sort |
leaching zn from the low-grade zinc oxide ore in nh3-h3c6h5o7-h2o media |
publisher |
Brazilian Society of Chemical Engineering |
series |
Brazilian Journal of Chemical Engineering |
issn |
1678-4383 |
description |
Abstract In this research, the effect of different citric acid concentrations, ammonia concentration, temperature, leaching time, stirring speed and liquid-to-solid ratio on the zinc leaching from low-grade zinc oxide ore in a NH3-H3C6H5O7-H2O system were studied. The results showed that the zinc leaching rate is only 4.7% when the citric acid concentration is 0 M, and the leaching efficiency of Zn increased with increasing citric acid concentration. Under the conditions: citric acid concentration of 1.0 M, ammonia concentration of 6 M, temperature of 25 °C, leaching time of 60 min, stirring speed of 300 rpm and the starting solid-to-liquid ratio of 1:5, 81.2% of Zn is leached. The mineralogical changes of the low-grade zinc oxide ores during the processes were characterized by X-ray fluorescence (XRF), X-ray powder diffraction (XRD), Scanning Electron Microscopy associated with Energy Dispersive Spectroscopy (SEM-EDS) and Fourier transform infrared spectroscopy (FT-IR). From the evidence we deduced that citric ions complexed with zinc ions, forming a Zn-citrate complex. As a result, the zinc leaching rate was improved without the risk of pollution or pretreatment. This makes it as a good choice for a more ecological treatment of hemimorphite. |
topic |
Low-grade zinc oxide ores Hemimorphite Ammonia leaching Citric acid |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322016000400907&lng=en&tlng=en |
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