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Application of thermodynamic modelling and experimental investigation of leaching yttrium from liquid crystal display

Thermodynamic modelling, experiment, measurement, and characterization technique were used to evaluate the leaching process of yttrium (Y) elements from liquid crystal display (LCD) electronic waste (e-waste). Thermodynamic modelling using HSC 6.0 software revealed that the reaction of leaching out...

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Main Authors: Ahmat, Farouq, M. Y. M., Yunus, Badhrulhisham, Abdul Aziz, Anwaruddin, Hisyam
Format: Article
Language:English
Published: Universiti Malaysia Pahang 2018
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TP Chemical technology
Online Access:http://umpir.ump.edu.my/id/eprint/20946/1/Application%20of%20thermodynamic%20modelling%20and%20experimental%20investigation.pdf
http://umpir.ump.edu.my/id/eprint/20946/
http://jceib.ump.edu.my/index.php/en/volume-3-docman/65-application-of-thermodynamic-modelling-and-experimental-investigation-of-leaching-yttrium-from-liquid-crystal-display
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spelling my.ump.umpir.209462018-06-26T04:31:25Z http://umpir.ump.edu.my/id/eprint/20946/ Application of thermodynamic modelling and experimental investigation of leaching yttrium from liquid crystal display Ahmat, Farouq M. Y. M., Yunus Badhrulhisham, Abdul Aziz Anwaruddin, Hisyam TP Chemical technology Thermodynamic modelling, experiment, measurement, and characterization technique were used to evaluate the leaching process of yttrium (Y) elements from liquid crystal display (LCD) electronic waste (e-waste). Thermodynamic modelling using HSC 6.0 software revealed that the reaction of leaching out Y with hydrochloric acid is endothermic thus absorbing heat and at the same time positive Gibbs free energy from temperature 273.15 K to 343.15 K and negative Gibbs free energy from temperature 353.15 K to 373.15 K. Thermodynamic data of the leaching processes with sulfuric and nitric acids show that the reactions are exothermic thus release heat and at the same time negative Gibbs free energy from temperature 273.15K and above. The leaching reaction with sulfuric and nitric acids identified to be reversible from temperature 273.15 K and above due to the negative entropy change, whereas the reaction was found irreversible for the hydrochloric acid solution due to the positive entropy change at the similar minimum temperature setting. The significance of reversibility versus irreversibility is their relationship to the efficiency. The equilibrium constant show that the leaching process with hydrochloric acid is less than 1 (Log K<1) from temperature 273.15 K to 343.15 K indicate that the backward reaction is favored while from temperature 353.15 K to 373.15 K have a positive equilibrium constant (Log K>1) thus indicate that forward reaction is favored. Leaching process with sulfuric and nitric acids shows that the positive equilibrium constant (Log K>1) which indicate that forward reaction is favored from temperature 273.15 K and above. The Pourbaix diagram modelling showed that Y dissolved in HCl at pH below 7 therefore strong reducing agents such as sulfuric acid (sulfide) can improve the dissolution of Y. Inductively coupled plasma mass spectroscopy (ICP-MS) results showed that only Y is viable to be efficiently leached from the studied LCD, e-waste either in a single-stage or in two-stage leaching mode. Sulfuric and nitric acids are found to be the most practical solutions in leaching out the Y element whereby around 0.00515 ppm and 0.00507 ppm of Y were dissolved in both solutions respectively based on the two-stages leaching approach. Universiti Malaysia Pahang 2018 Article PeerReviewed text en http://umpir.ump.edu.my/id/eprint/20946/1/Application%20of%20thermodynamic%20modelling%20and%20experimental%20investigation.pdf Ahmat, Farouq and M. Y. M., Yunus and Badhrulhisham, Abdul Aziz and Anwaruddin, Hisyam (2018) Application of thermodynamic modelling and experimental investigation of leaching yttrium from liquid crystal display. Journal of Chemical Engineering and Industrial Biotechnology (JCEIB), 3. pp. 17-25. ISSN 0126-8139 http://jceib.ump.edu.my/index.php/en/volume-3-docman/65-application-of-thermodynamic-modelling-and-experimental-investigation-of-leaching-yttrium-from-liquid-crystal-display DOI: https://doi.org/10.15282/JCEIB-V3-03.28/3/2018/3.3
institution Universiti Malaysia Pahang
building UMP Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Pahang
content_source UMP Institutional Repository
url_provider http://umpir.ump.edu.my/
language English
topic TP Chemical technology
spellingShingle TP Chemical technology
Ahmat, Farouq
M. Y. M., Yunus
Badhrulhisham, Abdul Aziz
Anwaruddin, Hisyam
Application of thermodynamic modelling and experimental investigation of leaching yttrium from liquid crystal display
description Thermodynamic modelling, experiment, measurement, and characterization technique were used to evaluate the leaching process of yttrium (Y) elements from liquid crystal display (LCD) electronic waste (e-waste). Thermodynamic modelling using HSC 6.0 software revealed that the reaction of leaching out Y with hydrochloric acid is endothermic thus absorbing heat and at the same time positive Gibbs free energy from temperature 273.15 K to 343.15 K and negative Gibbs free energy from temperature 353.15 K to 373.15 K. Thermodynamic data of the leaching processes with sulfuric and nitric acids show that the reactions are exothermic thus release heat and at the same time negative Gibbs free energy from temperature 273.15K and above. The leaching reaction with sulfuric and nitric acids identified to be reversible from temperature 273.15 K and above due to the negative entropy change, whereas the reaction was found irreversible for the hydrochloric acid solution due to the positive entropy change at the similar minimum temperature setting. The significance of reversibility versus irreversibility is their relationship to the efficiency. The equilibrium constant show that the leaching process with hydrochloric acid is less than 1 (Log K<1) from temperature 273.15 K to 343.15 K indicate that the backward reaction is favored while from temperature 353.15 K to 373.15 K have a positive equilibrium constant (Log K>1) thus indicate that forward reaction is favored. Leaching process with sulfuric and nitric acids shows that the positive equilibrium constant (Log K>1) which indicate that forward reaction is favored from temperature 273.15 K and above. The Pourbaix diagram modelling showed that Y dissolved in HCl at pH below 7 therefore strong reducing agents such as sulfuric acid (sulfide) can improve the dissolution of Y. Inductively coupled plasma mass spectroscopy (ICP-MS) results showed that only Y is viable to be efficiently leached from the studied LCD, e-waste either in a single-stage or in two-stage leaching mode. Sulfuric and nitric acids are found to be the most practical solutions in leaching out the Y element whereby around 0.00515 ppm and 0.00507 ppm of Y were dissolved in both solutions respectively based on the two-stages leaching approach.
format Article
author Ahmat, Farouq
M. Y. M., Yunus
Badhrulhisham, Abdul Aziz
Anwaruddin, Hisyam
author_facet Ahmat, Farouq
M. Y. M., Yunus
Badhrulhisham, Abdul Aziz
Anwaruddin, Hisyam
author_sort Ahmat, Farouq
title Application of thermodynamic modelling and experimental investigation of leaching yttrium from liquid crystal display
title_short Application of thermodynamic modelling and experimental investigation of leaching yttrium from liquid crystal display
title_full Application of thermodynamic modelling and experimental investigation of leaching yttrium from liquid crystal display
title_fullStr Application of thermodynamic modelling and experimental investigation of leaching yttrium from liquid crystal display
title_full_unstemmed Application of thermodynamic modelling and experimental investigation of leaching yttrium from liquid crystal display
title_sort application of thermodynamic modelling and experimental investigation of leaching yttrium from liquid crystal display
publisher Universiti Malaysia Pahang
publishDate 2018
url http://umpir.ump.edu.my/id/eprint/20946/1/Application%20of%20thermodynamic%20modelling%20and%20experimental%20investigation.pdf
http://umpir.ump.edu.my/id/eprint/20946/
http://jceib.ump.edu.my/index.php/en/volume-3-docman/65-application-of-thermodynamic-modelling-and-experimental-investigation-of-leaching-yttrium-from-liquid-crystal-display
_version_ 1643669010661769216
score 13.211869

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